In nxView we can see the stereo image and the projected pattern, but on the black surfaces the pattern appears very weak or barely visible. The corresponding regions in the disparity/depth view are missing or very sparse. Other, brighter objects in the same scene are reconstructed correctly, so the camera and basic setup seem to work. projector brightness is 100 % and exposure is in auto .
please help me on this . so i can see the black colored items from camera
Unfortunately, this is the main limitation of any optical system: objects that do not reflect light cannot be seen. This is especially true for our cameras. To make the stereo-matching work, the projected pattern must be visible.
There are a few things you can do:
Check that none of the stereo-matching settings are responsible for removing too many points. Try disabling all thresholds, such as “Shadowing Threshold,” “Correspondence Thresholds,” and “Uniqueness Ratio.”
Try setting the multi-exposure factor (“Capture” tab in the camera “Parameters” window in NxView).
Set up or remove some external additional light.
Share a file-camera so we can see these black objects.
And even before that, if you haven’t already done so, you can start turning AutoBrightness/Target a bit higher, this can already help to lighten up the dark parts, without losing the bright ones. And then move on with the points above.