Method for producing images with depth information and image sensor
Abstract:
The invention relates to the production of images associating with each point of the image a depth, i.e. a distance between the observed point and the camera that produced the image.A light source emits N trains of light pulses. For each train of rank I=1 to N, charge is integrated in a short time slot of length Tint that starts with a temporal offset ti relative to the pulse, this temporal offset representing a journey time of the light pulse between the light source and the sensor after reflection from a point placed a distance di from the sensor. The temporal offset ti is the same for all the light pulses of the ith pulse train but the temporal offsets ti of the N trains are different from one another in order to correspond to various distances relative to the sensor. The charge photogenerated by the pulses of a given train is accumulated; then the accumulated charge is read in order to produce an image of rank i representing the pixels located at the distance di. The observation of a scene comprises producing N different images by virtue of which it is possible to associate a distance with each pixel.
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