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I just have a confusion in understanding the difference between the Active IR image and depth Image of Kinect v2. Can anyone tell me the what special features Active IR image have as compare to depth image?
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The depth camera supports 2x2 binning modes to extend the Z-range in comparison to the corresponding unbinned modes. Binning is done at the cost of lowering image resolution. All modes can be run at up to 30 frames-per-second (fps) with exception of the 1 megapixel (MP) mode that runs at a maximum frame rate of 15 fps.
For a stereo camera, all infrared noise is good noise. Stereo depth cameras have two sensors, spaced a small distance apart. A stereo camera takes the two images from these two sensors and compares them. Since the distance between the sensors is known, these comparisons give depth information.
An IR camera is essentially the same as a regular RGB camera except that the images it captures are in the Infra-Red color range. So nothing too fancy going on there, still no actual depth sense.
In the depth image, the value of a pixels relates to the distance from the camera as measured by time-of-flight. For the active infrared image, the value of a pixel is determined by the amount of infrared light reflected back to the camera.
Sidenote: I think there is only one sensor that does both these. The Kinect uses the reflected IR to calculate time of flight but then also makes it available as an IR image.
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