Machine Vision defect Detection-learning side-camera selection

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Machine Vision defect Detection-Learn to do-camera select camera schematic and basic structure camera basic parameters determine field of view and pixel determine pixel depth camera type maximum frame rate line frequency cell size final selection

Machine Vision defect detection-learning side-camera selection camera schematic and basic structure

Schematic ↑

Full map ↑

Aperture and depth of field ↑ camera Basic parameters determine field of view and pixel determination

The maximum diameter of the detected quartz lens is 38.6mm. That is, the maximum dispersion circle diameter.

Sample ↑

Small scratches sample ↑

Scratches measurement ↑
As shown above, the pixel size is calculated using a lens with a diameter of 28.3. The scratches are smaller and less easily recognizable than the notch. The camera's pixel determination will be based on scratches. As can be seen from the figure, the size of a square is basically matched with the size of the scratch width. A box can be used as a pixel point. Pixel size is rsmall=94∗94=8836 Pixels r_{small} = 94*94=8836\ Pixels
In practical application, the lens diameter will exceed two samples. Therefore, the design should be left to the amount of 50mm*50mm in the field of view to calculate. In this view, if you want to achieve the above calculated sharpness, the pixel should be: 50∗50rbasic=28.03∗28.0394∗94rbasic=28115 Pixel \dfrac {50*50}{r_{basic}}=\dfrac {28.03* 28.03}{94*94} \quad r_{basic}=28115\ Pixel
In order to get a clearer image, it is convenient for later image processing, four pixels to describe a scratch width, to obtain a more appropriate resolution: r=rbasic∗16=449851≈45 million pixels r=r_{basic}*16=449851\approx 45\ pixels |
At this point, the pixel parameter determines that at least 450,000 pixel camera should be selected. Camera vision should be able to adjust to 50mm*50mm.

Pixel Depth

Pixel depth is common in 8bit,10bit,12bit at this stage, there is no big demand. The main selection is 8bit, which is strong in generality. Camera Type

CCD cameras today still occupy a large part of the market for industrial vision. CMOS cameras, though less powerful, are acceptable for the current project. Main post-cost ratio. Maximum frame rate/Line frequency

No requirement at this stage. The manipulator speed is much slower than the camera speed. Mainly look at the price. Cell Size

As long as it is not too exaggerated, the existing size is easy to install. No requirement. Final Selection

In order to less toss in the early stage of the Pathfinder, the final selection of the large permanent Mercury mer-132-30gm CCD camera. The parameters are as follows:

The Mercury series industrial cameras are the latest compact industrial cameras developed by the large-scale image, which is only 29mmx29mmx29mm in size and is a good choice for users with demanding industrial camera sizes. MER-132-30GM/C uses the 1/3 "CCD sensor chip, through the GigE data interface for image data transmission, and integrated I/O (GPIO) interface, to provide cable locking device, stable operation in a variety of harsh environments, is a high reliability, cost-effective industrial camera products. MER-132-30GM/C has high resolution, high definition, high precision, low noise and other characteristics, suitable for industrial testing, medical, scientific research, education and security and other fields.

Performance features
♦ Support custom Aoi, reduce resolution to increase frame rate
♦ Programmable settings for gain, exposure time and white balance
♦ Three modes of operation: Continuous acquisition/soft trigger acquisition/external trigger acquisition
♦ Support the Exposure completion event notification function
♦ Output flash synchronous signal to achieve accurate synchronization of exposure and fill light
♦ Support to adjust packet length, packet spacing, optimize multi-machine simultaneous acquisition and transmission
♦ Support lookup table, parameter group function
♦ Provide color correction function to improve the color reduction of image collection
♦ Rugged All-metal housing and cable locking device
♦ Support single cable transmission up to 100 m
♦ Support genicam™ and GigE Vision®, direct connection to Halcon, LabVIEW and other third-party software
♦ Driver has been optimized for 32bit/64bit Windows
♦ Free SDK and rich two development instance source code

Model	mer-132-30gm
Resolution	1292x964
frame rate	30fps @ 1292x964
sensor type	1/3 "CCD
pixel size	3.75μmx3.75μm
Spectrum	Black and white
image Data Format	mono8/mono12
Signal-to-noise ratio	36dB
Data Interface	Fast Ethernet (100MBIT/S) or Gigabit Ethernet (1000mbit/s)
Power consumption	rated <3w (@ 12V DC)
Lens Interface	C
Mechanical size	29x29x29 mm (without C interface)
Operating Temperature	0°c ~ +45°c
Operating Humidity	10% ~ 80%
weight	42g
authentication	rohs,ce,gige vision,genicam