D435 vs D405 IR lens comparison
I'm trying to understand performance of the images produced by the D405/D401 vs the D435. The raw D405 IR image seems much sharper than the D435 which I can say is blurry. Is this due to it being already rectified / processed? From the datasheet, it appears they all have a focal length:
D435 has focal length of 1.93mm using OV9282 with global shutter.
D400 has f=1.93mm using OV9782
both OV7282 and OV9782 seem same sensor size. Any insight into this?
I've noticed a color image on the D435 can be much sharper further away than the IR.
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Hi Henry, the D401 / D405 have hardware differences to the other 400 Series stereo depth camera models that make them capable of sub-millimeter accurate, high quality images at very close range.
RGB is obtained from the depth sensor instead of having a separate RGB sensor and then the Image Signal Processor (ISP) on the new Vision Processor D4 Board V4 enhances the RGB.
The D401 / D405 are not equipped with a built-in infrared projector. The left and right imagers are equipped with IR Cut filters that exclude infrared frequencies from being visible to the camera. The D401 / D405 therefore cannot see infrared patterns produced by external IR pattern projectors or the built-in projectors of other 400 Series camera models that are equipped with one.
Having a short stereo baseline (the distance between the center of the left and right imagers) can also help to avoid blurring at very close range that would occur on a D435 if placed at extreme close distance from a surface.
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