Image Prespective Error

[Sajeesh]

Hi,

The image of part to be inspected using camera and product in perpendicular direction.

1. Basler Camera :Basler acA2440-20gm

Sensor Format	2/3''
	Sensor Type	CMOS
	Sensor Size	8.4 mm x 7.1 mm
	Resolution (HxV)	2448 px x 2048 px
	Resolution	5 MP
	Pixel Size (H x V)	3.45 µm x 3.45 µm
	Frame Rate	23 fps
	Mono/Color	Mono

2. Lense  : Computar M1214-MP2  (f=12mm F1.4)

But the image seems to be not correct towards the right end as if dilated some perspective / parallax/distortion. The image is finally used to do geometric pattern matching.

Please help to fix it or any other additional set up used.

[BruceAmmons]

This looks like a case where I would seriously consider a telecentric lens.  You are going to have some parallax errors with the current lens no matter what you do.  If you move the camera back and use a longer focal length lens, it would reduce but not eliminate the parallax.  A telecentric lens is the only way to completely eliminate parallax.

Bruce

[AmitShachaf]

Bruce is correct that telecentric lens is the best. But the other option of moving the camera away from the object and using longer focal lens will help a lot. Should be sufficient for geometric pattern finder.  

Try to use f = 45 or similar. 

Other option is to use image calibration to correct the image before you do the processing. 

https://zone.ni.com/reference/en-XX/help/370281AG-01/nivisionlvbasics/calibrating_images/

https://zone.ni.com/reference/en-XX/help/370281AG-01/imaqvision/imaq_correct_calibrated_image/

Good luck

Amit