Keyence Hv-5000 Camera
Easy
3 Step
Guide
Selecting Your First
Vision System
With many different camera, lighting, and controller options, this
guide is designed to help you determine which is the best vision
system for your inspection.
Vision system configuration
First, we'll introduce the overall composition of a vision system. Broadly speaking, a vision system is composed of a "controller"
which processes the images, and a "camera" that captures the object for detection. Their human equivalents would be the
"brain" and "eyes." The "lens," which is attached to the camera, is used to gather light on the image receiving elements, and
"lighting," which is used to appropriately adjust the brightness of the object for detection, are both important components of a
vision system.
Controller
Selection flow
The "camera," "lens," and "lighting" form
the basis for any vision system. To carry
out optimal inspections, proper selection
of these components is essential. In this
document, we will provide some of the
key points to selecting these 3
components.
STEP 1
STEP 2
STEP 3
Camera + Lens + Lighting
Selecting a camera
Selecting a lens
Selecting lighting
2
STEP 1
Selecting a camera
Verify the "minimum detection size" needed to find the object for detection
1
The "minimum detection size" refers to the smallest feature that a vision system will be able to detect with stability. Understand the size of the features
(defects, foreign particles, text/barcodes) that need to be detected, and understand what kind of capabilities the camera must have to find them.
0.31 megapixel
Differences in
camera capabilities
(number of pixels)
camera
Foreign particles are
blurry and hard to detect
Calculate the minimum detection size
Next, we'll introduce an example of the calculation to decide the minimum detection
size the system will be capable of processing. Minimum detection size is calculated
from approximate values for the following elements.
= Number of pixels in the camera's capture range (Y axis) (Pixels)
A
= Field of view (Y-axis) (mm or inches)
B
= Minimum detection pixel size for image sensor elements (Pixels)
C
Minimum detection size =
B ÷ A × C
2 megapixel
camera
Foreign particle
detection capability
C = Minimum detection
pixel size
Camera
A = Image sensor size (Y)
Lens
Foreign particles
B = Field of view (Y)
For example:
Let's think about the minimum detection size when (B) is set to 30 mm.
We'll compare a standard type 0.31 megapixel camera (Y = 480 pixels) and a high pixel-count type
2 megapixel camera (Y = 1200 pixels) for (A). The minimum detectable pixel size, (C), would generally be "4 × 4 pixels."
* The target minimum detectable pixel size changes depending on the object for detection and the inspection environment.
Minimum detection size when
using 0.31 megapixel camera
Minimum detection size = 30 ÷ 480 × 4 = 0.25 mm Minimum detection size = 30 ÷ 1200 × 4 = 0.1 mm
If the goal of the inspection is "to detect ø0.1 mm debris within a 30 mm vision field,"
then it is necessary to select a camera with 2 megapixels or higher.
Check
POINT
What is the size of the object that needs to be detected?
Minimum detection size when
using 2 megapixel camera
3
Select the optimal camera based on the "minimum detection size"
2
In general, as the number of pixels increases, increasingly smaller objects can be detected, but costs also increase.
It is important to select a camera that meets the "minimum detection size" requirement and is appropriate for the inspection. There are more than
20 types of cameras in the KEYENCE lineup. Beyond the number of pixels, choices such as monochrome or colour, compact or standard size and
so forth allow for selection of the optimal model for the application.
High precisionLow cost
Check
POINT
21 megapixels
5 megapixels
2 megapixels
0.47 megapixel
0.31 megapixel
What camera specifications are necessary?
Capture range
5104 × 4092 pixels
Capture range
2432 × 2040 pixels
Capture range
1600 × 1200 pixels
Capture range
784 × 596 pixels
Capture range
640 × 480 pixels
Colour
Monochrome
Colour
Monochrome
Colour
Monochrome
Compact model available
Colour
Monochrome
Colour
Monochrome
Compact model available
KEYENCE Technology
The power of a 21 megapixel camera
This camera can capture high resolution images with a valid pixel count of 21 megapixels (5104 × 4092 pixels). It can detect minute
defects and inspect small components on large work pieces.
140mm
0.31 megapixel camera
120mm
4
5 megapixel camera 21 megapixel camera
It is possible to
check fine details of
the inspection target.
Loading...