This image is kind of a black and white image. So, we can capture the intensities of the infrared light using this camera. Now unlike the RGB cameras we see everywhere, infrared cameras are CMOS sensors where they can detect the infrared light bounced off from our subjects. Step 2 : So, now we have a pattern on our room, then what happens is we have an IR camera that is this camera is capable of recording the infrared light. To visualize these dots use a night vision camera and you can see the amazing pattern of dots formed on your subject. Kinect has a diffractive optical element which means when the infrared light is generated at the projector, this light is diffracted to form the irregular pattern of dots. Step 1 : Power goes to the Infrared projector, this projector shoots an irregular pattern of dots with the wavelength of 700nm to 1mm and hence infrared is invisible to humans. So, for now lets not consider the RGB camera anymore and concentrate on the next 2 parts, here is what happens when you turn on kinect to capture a depth image : Now kinect has 3 main parts, an infrared projector, a RGB camera and a Infrared camera. This applies to all depth sensing technologies like kinect, project tango, prime sense and others. In this blog post I would like to go a step further and describe in more detail about how depth sensing actually works down to the roots. When we usually come across depth sensing cameras it is often said that we detect depth by using infrared cameras and topic is closed.
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