Forum Discussion
Stereo Camera
Hello, i want to build a stereo camera. I choosed this camera -> https://de.ids-imaging.com/store/ui-3241le.html But now i need to know which lens i should take. It should have a S-Mount M12...
Hi,
This only works if the lens is rectilinear though, which is most probably not the case at these values.
You would need to know the radial distortion parameters of the lens or the mapping function.
Note that in the general case the sensor "size" value indicated in specs (like 1/1.8" here) is more of a "category" than a physical value. (1" sensors are not 1" in any dimension).
The imaging area is also smaller than the whole sensor, due to dark rows, etc. The product sheet for the linked camera indicates 6.784 mm x 5.427 mm (still unclear if this is the whole pixel array or the usable array).
Another thing to take into account is the crop factor. The lens will project an image circle of a given diameter on the focal plane. Depending on the sensor size, the image rectangle will be entirely or partly inscribed in the circle. This will change the field of view imaged by the sensor. You will only get the full field of view of the lens in all dimensions if you have the entire circle into the image, in which case you won't use all the pixels.
The imaged diagonal field of view will match the lens FOV only if the lens projects a circle that perfectly match the sensor diagonal. M12 lenses usually have a "sensor size" rating that you can use to match your sensor.
"pixelminer" wrote:
Vertical FOV = 2*ARCTAN(SV /(2*FL))
This only works if the lens is rectilinear though, which is most probably not the case at these values.
You would need to know the radial distortion parameters of the lens or the mapping function.
Note that in the general case the sensor "size" value indicated in specs (like 1/1.8" here) is more of a "category" than a physical value. (1" sensors are not 1" in any dimension).
The imaging area is also smaller than the whole sensor, due to dark rows, etc. The product sheet for the linked camera indicates 6.784 mm x 5.427 mm (still unclear if this is the whole pixel array or the usable array).
Another thing to take into account is the crop factor. The lens will project an image circle of a given diameter on the focal plane. Depending on the sensor size, the image rectangle will be entirely or partly inscribed in the circle. This will change the field of view imaged by the sensor. You will only get the full field of view of the lens in all dimensions if you have the entire circle into the image, in which case you won't use all the pixels.
The imaged diagonal field of view will match the lens FOV only if the lens projects a circle that perfectly match the sensor diagonal. M12 lenses usually have a "sensor size" rating that you can use to match your sensor.