National Instruments NI Vision 1722, NI Vision 1744, NI Vision 1762, NI Vision 1764, NI Vision 1742 User Manual

NI Vision

NI 17xx Smart Camera User Manual

For NI 1722/1742/1744/1762/1764 Smart Cameras

NI 17xx Smart Camera User Manual

September 2013 374174A-01

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Contents

About This Manual

Related Documentation .................................................................................................... xi

Hardware Documents ............................................................................................... xi

NI Vision Builder for Automated Inspection Documents ........................................ xi

LabVIEW and NI Vision Development Module Documents................................... xii

NI Vision Acquisition Software Documents ............................................................ xii

Chapter 1 NI Smart Camera Overview

Hardware Overview.......................................................................................................... 1-1

Software Overview ........................................................................................................... 1-3

NI Vision Builder for Automated Inspection ........................................................... 1-3

LabVIEW.................................................................................................................. 1-3

LabVIEW Real-Time Module .......................................................................... 1-4

NI Vision Development Module ...................................................................... 1-4

NI Vision Acquisition Software ....................................................................... 1-4

Chapter 2 Power and I/O

POWER-I/O Connector.................................................................................................... 2-1

NI Smart Camera Power Requirements............................................................................ 2-2

Isolated Inputs................................................................................................................... 2-3

Isolated Outputs ................................................................................................................2-4

Protecting Against Inductive Loads ......................................................................... 2-5

Connecting to Serial Devices ........................................................................................... 2-5

Communicating with the Console ............................................................................ 2-6

Connecting to a Quadrature Encoder................................................................................ 2-6

Chapter 3 NI Smart Camera Image Sensor

Field of View .................................................................................................................... 3-1

Image Sensor Spectral Response ...................................................................................... 3-3

Partial Scan Mode............................................................................................................. 3-3

Binning ............................................................................................................................. 3-4

Gain .................................................................................................................................. 3-4

Hardware Binarization...................................................................................................... 3-5

Contents

Chapter 4 Lighting

Lighting Connector ........................................................................................................... 4-1

Direct Drive Lighting Controller ......................................................................................4-2

Lighting Files ............................................................................................................ 4-3

Selecting a Light ....................................................................................................... 4-4

Connecting a Light to the Direct Drive Lighting Controller .................................... 4-5

External Lighting Controllers ...........................................................................................4-6

Connecting an External Lighting Controller to the NI Smart Camera ..................... 4-7

Chapter 5 Image Acquisition

Exposure ........................................................................................................................... 5-1

Acquiring Images.............................................................................................................. 5-2

Internal Timing ......................................................................................................... 5-2

External Trigger ........................................................................................................ 5-2

Maximum Frame Rate ...................................................................................................... 5-5

Determining the Maximum Frame Rate ................................................................... 5-5

Determining the Scan Mode ..................................................................................... 5-6

Determining the Exposure Time............................................................................... 5-6

Determining the Lighting Mode ............................................................................... 5-6

Determining the Trigger Delay ................................................................................. 5-7

Calculating the Minimum Frame Period .................................................................. 5-7

Chapter 6 LEDs and DIP Switches

Understanding the LED Indicators ................................................................................... 6-1

Device Initialization.................................................................................................. 6-1

POWER LED............................................................................................................ 6-2

STATUS LED........................................................................................................... 6-2

IMG ACQ LED ........................................................................................................ 6-3

PASS LED ................................................................................................................6-3

FAIL LED................................................................................................................. 6-4

Configuring DIP Switches ................................................................................................ 6-4

SAFE MODE Switch................................................................................................ 6-4

IP RESET Switch...................................................................................................... 6-5

NO APP Switch ........................................................................................................ 6-5

CONSOLE Switch .................................................................................................... 6-6

viii | ni.com

NI 17xx Smart Camera User Manual

Chapter 7 Ethernet Ports

Ethernet LEDs .................................................................................................................. 7-2

ACTIVITY/LINK LED ............................................................................................ 7-2

SPEED LED ............................................................................................................. 7-2

DHCP and Static IP Address Assignment ........................................................................ 7-3

Firewall Considerations ............................................................................................ 7-3

Subnet Considerations .............................................................................................. 7-4

Chapter 8 Thermal Considerations and Mounting

Thermal Considerations.................................................................................................... 8-1

Mounting the NI Smart Camera ....................................................................................... 8-2

Appendix A Specifications

Appendix B Troubleshooting

Appendix C Maintenance

Appendix D Technical Support and Professional Services

Glossary

Index

About This Manual

This manual describes the electrical and mechanical aspects of the National Instruments 17xx Smart Camera. Refer to Getting Started with the NI 17xx Smart Camera for smart camera and accessory installation information.

Related Documentation

The following documents contain information that you may find helpful as you read this manual:

Hardware Documents

• Getting Started with the NI 17xx Smart Camera—Contains important safety information

and information about installing and configuring NI Smart Cameras and accessories. You

can access this manual by navigating to Start»All Programs»National Instruments» Vision»Documentation»NI-IMAQ.

• NI Developer Zone—Contains example programs, tutorials, technical presentations, the

Instrument Driver Network, a measurement glossary, an online magazine, a product advisor, and a community area where you can share ideas, questions, and source code with developers around the world. The NI Developer Zone is located on the National Instruments Web site at NI Developer Zone:

ni.com/zone. You can find the following documents in the

– Using the NI 17xx Smart Camera Direct Drive Lighting Controller—Demonstrates

how to utilize the Direct Drive lighting controller feature on the NI 17xx Smart Camera with LabVIEW or Vision Builder for Automated Inspection.

– A Practical Guide to Machine Vision Lighting—Explains machine vision lighting

concepts and theories.

NI Vision Builder for Automated Inspection Documents

• NI Vision Builder for Automated Inspection Tutorial—Describes Vision Builder for

Automated Inspection and provides step-by-step instructions for solving common visual inspection tasks, such as inspection, gauging, part presence, guidance, and counting.

• NI Vision Builder for Automated Inspection: Configuration Help—Contains information

about using the Vision Builder for Automated Inspection Configuration Interface to create a machine vision application.

• NI Vision Builder for Automated Inspection: Inspection Help—Contains information about

running applications created with Vision Builder for Automated Inspection in the Vision Builder Automated Inspection Interface.

About This Manual

LabVIEW and NI Vision Development Module Documents

• LabVIEW Help—Includes information about LabVIEW programming concepts, step-by-step instructions for using LabVIEW, and reference information about LabVIEW VIs, functions, palettes, menus, and tools.

• Getting Started with LabVIEW—Use this manual as a tutorial to familiarize yourself with the LabVIEW graphical programming environment and the basic LabVIEW features you use to build data acquisition and instrument control applications.

• Getting Started with the LabVIEW Real-Time Module—Use this manual as a tutorial to familiarize yourself with the LabVIEW Real-Time Module and the basic Real-Time Module features you use to build real-time applications.

• NI Vision Concepts Manual—Describes the basic concepts of image analysis, image processing, and machine vision. This document also contains in-depth discussions about imaging functions for advanced users.

• NI Vision for LabVIEW Help—Describes how to create machine vision and image processing applications in LabVIEW using the Vision Development Module. The help file guides you through tasks beginning with setting up your imaging system to taking measurements. It also describes how to create a real-time vision application using NI Vision with the LabVIEW Real-Time Module and contains reference information about NI Vision for LabVIEW palettes and VIs.

NI Vision Acquisition Software Documents

• NI-IMAQ VI Reference Help—Contains reference information about the LabVIEW VIs and properties for NI-IMAQ driver software.

• Measurement & Automation Explorer Help for NI-IMAQ—Describes how to configure NI-IMAQ driver software, NI image acquisition devices, and NI Smart Cameras using Measurement & Automation Explorer.

xii | ni.com

NI Smart Camera Overview

This chapter provides an overview of the features and components of the National Instruments Smart Camera. Refer to Getting Started with the NI 17xx Smart Camera for smart camera and accessory installation information.

Hardware Overview

The NI Smart Camera is available in several different configurations. When a feature pertains only to specific smart camera models, a list at the beginning of the section shows which smart camera models support the feature.

All smart camera models incorporate an image sensor, processor, and digital I/O in a compact, rugged housing.

Table 1-1 shows the differentiating features for each smart camera model.

Table 1-1. NI Smart Camera Models

NI Smart

Camera

Model Processor Image Sensor

NI 1722 400 MHz PowerPC 1/3 inch Sony ICX424AL

CCD Monochrome 640 × 480 pixels (VGA)

NI 1742 533 MHz PowerPC 1/3 inch Sony ICX424AL

CCD Monochrome 640 × 480 pixels (VGA)

NI 1744 533 MHz PowerPC 1/2 inch Sony ICX205AL

CCD Monochrome 1,280 × 1,024 pixels (SXGA)

NI 1762 533 MHz PowerPC

and 720 MHz DSP

NI 1764 533 MHz PowerPC

and 720 MHz DSP

1/3 inch Sony ICX424AL CCD Monochrome 640 × 480 pixels (VGA)

1/2 inch Sony ICX205AL CCD Monochrome 1,280 × 1,024 pixels (SXGA)

Direct Drive

Lighting

Controller

No No

Ye s Ye s

Quadrature

Encoder

Support

Chapter 1 NI Smart Camera Overview

For more information about the image sensors, refer to Chapter 3, NI Smart Camera Image

Sensor. For complete smart camera specifications, refer to Appendix A, Specifications.

All smart cameras have an RS-232 serial port, Gigabit Ethernet ports, and use a standard C-mount lens. Some smart camera models also include the Direct Drive lighting controller and support for quadrature encoders. The Direct Drive lighting controller is an integrated controller to directly power a variety of third-party current-controlled lights. Refer to Chapter 4, Lighting, for more information about the Direct Drive lighting controller. The smart camera also has one 5 V TTL strobe output and one unregulated 24 V strobe output for lighting control.

The smart camera also includes LEDs for communicating system status, four DIP switches to specify startup options, isolated inputs, and isolated outputs for connecting to external devices. Refer to Chapter 6, LEDs and DIP Switches, for more information about the LEDs and DIP switches. Refer to Chapter 2, Power and I/O, for more information about the digital I/O capabilities of the smart camera.

Figure 1-1 shows the smart camera.

Figure 1-1. NI Smart Camera

GND

24V

NI 17XX SMART CAMERA

1 Image Sensor 2 Standard C Lens Mount 3 Lighting Connector 4LEDs

1-2 | ni.com

5 DIP Switches 6 POWER-I/O Connector 7 Ethernet Ports

NI 17xx Smart Camera User Manual

Vision Builder

for

Automated Inspection

LabVIEW

LabVIEW Real-Time Module

NI Vision Development Module

NI Vision Acquisition Software

Software Overview

Developing applications with the NI Smart Camera requires one of the following software options:

The installation and configuration process for each development environment is different. Refer to Getting Started with the NI 17xx Smart Camera for installation and configuration instructions.

The following sections describe the software options. For detailed information about individual software packages, refer to the documentation specific to the package.

Note Vision Builder for Automated Inspection and NI Vision Acquisition Software

are included with the smart camera. LabVIEW, the LabVIEW Real-Time Module, and the NI Vision Development Module are sold separately.

NI Vision Builder for Automated Inspection

Vision Builder for Automated Inspection (Vision Builder AI) is configurable machine vision software you can use to configure the NI Smart Camera and prototype, benchmark, and deploy machine vision applications.

Creating applications in Vision Builder AI does not require programming. Vision Builder AI allows you to easily configure and benchmark a sequence of visual inspection steps, as well as deploy the visual inspection system for automated inspection. With Vision Builder AI, you can perform powerful visual inspection tasks and make decisions based on the results of individual tasks. You can also migrate your configured inspection to LabVIEW, extending the capabilities of your applications if necessary.

LabVIEW

LabVIEW is a graphical programming environment for developing flexible and scalable applications. To develop machine vision applications with the NI Smart Camera and LabVIEW, you must have the following add-on modules: LabVIEW Real-Time Module, NI Vision Development Module, and Vision Acquisition Software.

Chapter 1 NI Smart Camera Overview

LabVIEW Real-Time Module

The LabVIEW Real-Time Module combines LabVIEW graphical programming with the power of Real-Time (RT) hardware, enabling you to build deterministic, real-time systems. You develop VIs in LabVIEW and embed the VIs on RT targets, such as the NI Smart Camera. The RT target runs VIs without a user interface and offers a stable platform for real-time VIs. For more information about the LabVIEW Real-Time Module, refer to the LabVIEW Help.

NI Vision Development Module

The NI Vision Development Module is an image acquisition, processing, and analysis library of hundreds of functions for the following common machine vision tasks:

• Pattern matching

• Particle analysis

• Gauging

• Taking measurements

• Grayscale, color, and binary image display

With the NI Vision Development Module you can acquire, display, and store images as well as perform image analysis and processing. Using the NI Vision Development Module, imaging novices and experts can program the most basic or complicated image applications without knowledge of particular algorithm implementations.

For information about how to use the NI Vision Development Module with the LabVIEW Real-Time Module, refer to the NI Vision for LabVIEW Help.

NI Vision Acquisition Software

The NI Vision Acquisition Software CD contains Measurement & Automation Explorer (MAX) configuration software and NI-IMAQ driver software.

Use MAX to configure the NI Smart Camera. You can set the IP address, update software on the smart camera, configure triggering, and set up the lighting features. For more information about MAX, refer to the Measurement & Automation Explorer Help for NI-IMAQ

NI-IMAQ is the interface path between the application software and the smart camera. NI-IMAQ also controls the I/O and image acquisition on the smart camera.

NI-IMAQ includes an extensive library of VIs you can call from LabVIEW. These VIs include routines for video configuration, continuous and single-shot image acquisition, and trigger control.

The NI-IMAQ driver software performs all functions necessary for acquiring and saving images but does not perform image analysis. NI-IMAQ features both high-level and low-level functions. A function that acquires images in single-shot or continuous mode is an example of a high-level function. A function that requires advanced understanding of image acquisition, such as configuring an image sequence, is an example of a low-level function.

For information about using NI-IMAQ to configure an acquisition, refer to the NI-IMAQ VI Reference Help.

1-4 | ni.com

Power and I/O

This chapter provides information about the NI Smart Camera POWER-I/O connector, connecting isolated inputs and isolated outputs, and connecting to serial devices and to quadrature encoders.

POWER-I/O Connector

The POWER-I/O connector provides signal connections for power and I/O, including isolated inputs and outputs, quadrature encoders, and serial devices. The POWER-I/O connector is a standard female high-density 15-pin D-SUB connector. Table 2-1 shows the pin organization for the POWER-I/O connector. The two pins used to connect to a power supply, pin 15 and pin 5, are also shown in the table. Refer to Getting Started with the NI 17xx Smart Camera for information about connecting a power supply to the NI Smart Camera.

Table 2-1 lists the signal names and pin numbers for the 15-pin POWER-I/O connector. The table also lists the wire colors for the 15-pin D-SUB pigtail cable (part number 197818-05), sold separately by National Instruments. Cables sold by other manufacturers could have different wire colors.

Table 2-1. POWER-I/O Connector Signal Descriptions

Connector Diagram Signal Name Pin Number Wire Color

+24 V 5 Red

COM 15 Black

15 (COM)

5 (+24 V)

RS232_TXD 10 Pink

RS232_RXD 14 Black/White

TrigIn+

IsoIn(0)+

IsoIn(1)+ 8 Orange

2 Brown

Chapter 2 Power and I/O

Table 2-1. POWER-I/O Connector Signal Descriptions (Continued)

Connector Diagram Signal Name Pin Number Wire Color

TrigIn-

12 Light Green IsoIn(0)IsoIn(1)-

IsoOut(0)+ 6 Yel l ow

IsoOut(0)- 1 Green

15 (COM)

IsoOut(1)+ 11 Light Blue

IsoOut(1)- 7 Gray

5 (+24 V)

PhaseA+ 3 Blue

PhaseA- 13 Brown/White

PhaseB+ 9 Purple

PhaseB- 4 White

NI Smart Camera Power Requirements

Caution Use the NI Smart Camera only with a 24 VDC, UL listed, limited power

source (LPS) supply. The power supply should bear the UL listed mark, LPS. The power supply must meet any safety and compliance requirements for the country of use.

The smart camera uses a nominal 24 VDC power source. The smart camera accepts power within the range of the industry standard IEC 1311 input power specification (24 V +20%/-15% with an additional allowance for an AC peak of +5%). Refer to Appendix A, Specifications, for complete power requirement specifications.

Caution The 24 V external lighting strobe is an unregulated output dependent on

the range of the power supply provided to the smart camera. If the power provided to the smart camera is +20%/-15% with +5% AC ripple, the external lighting strobe output could be as high as 30 V. If the provided power exceeds the input voltage specifications of the third-party lighting controller, do not connect the 24 V lighting strobe output to the controller to prevent damage to the controller. Use a power supply with tolerances that meet the requirements of the controller, or use the 5 V external lighting strobe.

2-2 | ni.com

NI 17xx Smart Camera User Manual

Sensor

Power

Sensor

Common

PNP (Sourcing)

Output Device

NI 17xx

TrigIn+

IsoIn(0)+

IsoIn(1)+

TrigIn– IsoIn(0)– IsoIn(1)–

If you are using the Direct Drive lighting controller, the power supply wattage must be sufficient to power both the camera and the light. The power required by the light can be significantly more than the power required by the smart camera.

Note The NI Smart Camera will revert to the default timestamp if power is

interrupted and the device is not connected to a network. Ensure your power supply is not interrupted, or the device is connected to a networked or local SMTP server, to maintain accurate timestamps.

Isolated Inputs

Caution Do not apply a voltage greater than 30 VDC to the isolated inputs.

Voltages greater than 30 VDC may damage the NI Smart Camera.

Caution The isolated inputs and outputs on the smart camera provide an easy

means for preventing ground loops that could degrade signal integrity. The isolation on the smart camera is not safety isolation.

You can wire an isolated input to both sourcing and sinking output devices. Refer to Figures 2-1 and 2-2 for wiring examples by output type. Refer to Appendix A, Specifications, for current requirements.

Isolated inputs are not compatible with 5 V logic.

Figure 2-1. Connecting External Sourcing Output Sensors to Isolated Inputs

Chapter 2 Power and I/O

Sensor

Power

Sensor

Common

NI 17xx

NPN (Sinking) Output Device

TrigIn+

IsoIn(0)+

IsoIn(1)+

TrigIn– IsoIn(0)– IsoIn(1)–

Sourcing

Load

IsoOut+

IsoOut–

NI 17xx

Sensor Power

Sensor Common

Figure 2-2. Connecting External Sinking Output Sensors to Isolated Inputs

Isolated Outputs

Caution Do not power the load connected to the isolated outputs with any external

power supply greater than 30 VDC. Voltages greater than 30 VDC may damage the NI Smart Camera.

Caution The isolated inputs and outputs on the smart camera provide an easy

means for preventing ground loops that could degrade signal integrity. The isolation on the smart camera is not safety isolation.

The isolated outputs can be used to drive external loads, as shown in Figures 2-3 and 2-4.

Figure 2-3. Connecting an Isolated Output to a Sourcing External Load

2-4 | ni.com

Figure 2-4. Connecting an Isolated Output to a Sinking External Load

IsoOut+

IsoOut–

NI 17xx

Sensor Power

Sensor Common

Sinking

Load

Protecting Against Inductive Loads

NI 17xx Smart Camera User Manual

When an inductive load, such as a relay or solenoid, is connected to an output, a large counter-electromotive force may occur at switching time due to energy stored in the inductive load. This flyback voltage can damage the outputs and the power supply.

To limit flyback voltages at the inductive load, install a flyback diode across the load. Mount the flyback diode as close to the load as possible. Use this protection method if you connect any of the isolated outputs to an inductive load.

Connecting to Serial Devices

Use the RS232_RXD and RS232_TXD signals on the POWER-I/O connector for serial communication. Connect the RS232_RXD signal on the NI Smart Camera to the Tx signal on your serial device. Connect the RS232_TXD signal on the smart camera to the Rx signal on your serial device. Connect COM on the smart camera to the ground of your serial device.

When the CONSOLE DIP switch is in the OFF position, you can use the NI-Serial driver for serial communication. You must install the NI-Serial software on the smart camera; it is not installed by default. Refer to the Serial Hardware and Software Help for information about installing the NI-Serial software on LabVIEW Real-Time targets, such as the smart camera. To

open this document, navigate to Start»All Programs» National Instruments»NI-Serial» NI-Serial Help.

Chapter 2 Power and I/O

Communicating with the Console

When the CONSOLE DIP switch is in the ON position, you can read device information from the NI Smart Camera during startup, such as the IP address and firmware version, through a serial port terminal program. Ensure that the serial port terminal program is configured to the following settings:

• 9,600 bits per second

• Eight data bits

• No parity

• One stop bit

• No flow control

Connecting to a Quadrature Encoder

This section applies only to the following NI Smart Cameras:

• NI 1742

• NI 1744

• NI 1762

• NI 1764

Connect RS-422 compatible differential quadrature encoders to the NI 17xx Smart Camera to provide positional information. A quadrature encoder uses two output channels, Phase A and Phase B, to track the position of a rotary shaft. Generally, the shaft is coupled to a motor drive that controls the movement of an object. By providing Phase A and Phase B signals to the smart camera, you can obtain a precise measurement of the object position. Using a quadrature encoder gives you the ability to specify your trigger delay in terms of positional units—such as inches or centimeters, after applying the resolution information of your encoder—rather than time.

National Instruments does not recommend the use of single-ended encoders with the smart camera. This configuration would require the ground for a single-ended encoder to be connected to the COM pin of the smart camera, and the PhaseA- and PhaseB- signals would be left unconnected. In this configuration, the system is susceptible to significant noise that would be eliminated by using a differential encoder.

Shielded encoder cables are recommended for all applications. Unshielded cables are more susceptible to noise and can corrupt the encoder signals.

Refer to the External Trigger section of Chapter 5, Image Acquisition, for information about using a quadrature encoder to delay a trigger.

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NI 17xx Smart Camera User Manual

Phase A+

Phase A–

Phase A

Phase B+

Phase B–

Phase B

Encoder NI 17xx

Tw isted Pair

–

Phase A–

Phase A+

–

Phase B–

Phase B+

+3.3 V

10 kΩ 10 kΩ 10 kΩ 10 kΩ

7.5 kΩ 7.5 kΩ 7.5 kΩ 7.5 kΩ

NI 17xx

Figure 2-5 shows an example of connecting the quadrature encoder differential line drivers.

Figure 2-5. Connecting Differential Line Drivers

Figure 2-6 shows the internal quadrature encoder/RS-422 input circuit.

Figure 2-6. NI Smart Camera Quadrature Encoder Input Circuit

FOV

Pixel Pitch Active Pixels× Working Distance×

Focal Length

-----------------------------------------------------------------------------------------------------------------=

NI Smart Camera Image Sensor

This chapter provides an overview of the NI Smart Camera image sensors, field of view, spectral response, partial scan mode, binning, gain, and hardware binarization. NI 1722/1742/1762 Smart Cameras use a VGA sensor. NI 1744/1764 Smart Cameras use an SXGA sensor. Refer to Appendix A, Specifications, for information about your smart camera image sensor.

Field of View

The field of view is the area under inspection that will be imaged by the NI Smart Camera. It is critical to ensure that the field of view of your system includes the object you want to inspect.

To calculate the horizontal and vertical field of view (FOV) of your imaging system, use Equation 3-1 and the specifications for the image sensor of your smart camera, as listed in Appendix A, Specifications.

where FOV is the field of view in either the horizontal or vertical direction,

Pixel Pitch measures the distance between the centers of adjacent pixels in either the horizontal or vertical direction,

Active Pixels is the number of pixels in either the horizontal or vertical direction,

Working Distance is the distance from the front element (external glass) of the lens to

the object under inspection, and

Focal Length measures how strongly a lens converges (focuses) or diverges (diffuses) light.

(3-1)

Chapter 3 NI Smart Camera Image Sensor

FOV

horizontal

0.0074 mm 640× 100 mm× 8 mm

-------------------------------------------------------------------- - 59.2 mm==

FOV

vertical

0.0074 mm 480× 100 mm× 8 mm

-------------------------------------------------------------------- - 44.4 mm==

Figure 3-1 illustrates horizontal field of view and working distance.

Figure 3-1. Parameters of an Imaging System

1 Horizontal Imaging Width 2 Working Distance 3 Horizontal Field of View

For example, if the working distance of your imaging setup is 100 mm, and the focal length of the lens is 8 mm, then the field of view in the horizontal direction of a smart camera using the VGA sensor in full scan mode is

(3-2)

Similarly, the field of view in the vertical direction is

(3-3)

Based on the result of Equations 3-2 and/or 3-3, you can see that you might need to adjust the various parameters in the FOV equation until you achieve the right combination of components that match your inspection needs. This might include increasing your working distance, choosing a lens with a shorter focal length, or changing to a high resolution camera.

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NI 17xx Smart Camera User Manual

abc

Image Sensor Spectral Response

The spectral response curve describes the relative sensitivity of the sensor to different wavelengths of light. The peak responsiveness of the VGA and SXGA sensors is to light with a wavelength of approximately 500 nm. If you are imaging a dim scene, this information can be useful when selecting a light source to use in your application as the camera is most sensitive at its peak responsiveness. It also helps determine what, if any, filters your application might require to remove undesired wavelengths of light from the scene.

Refer to Appendix A, Specifications, to find the normalized spectral response curves for the VGA and SXGA sensors.

Partial Scan Mode

Partial scan mode is a method of obtaining higher frame rates by reading out only a portion of the image from the sensor. Partial scan is frequently used when an application requires higher speed but less resolution than the sensor offers in full scan mode. The NI Smart Camera supports 1/2 scan and 1/4 scan. In 1/2 scan, shown in Figure 3-2b, one half of the image is read out from the center of the sensor and the rest of the image is discarded to enable a faster start of the next frame. In 1/4 scan, only one quarter of the image is read out. Figure 3-2 illustrates the portion of the sensor exposed during partial scanning.

Figure 3-2. Partial Scan Modes

a Full Scan b 1/2 Scan c 1/4 Scan

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