Depth non-linearity compensation in time-of-flight imaging
AssigneeAnalog Devices International Unlimited Company
InventorsNicolas LE DORTZ, Jonathan Ephraim David HURWITZ, Erik D. BARNES
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Abstract
An image processing system for time-of-flight depth imaging includes a processor for determining depth measurements using different modes of operation. The processor determines depth measurements in a first set of frames using a second set of frames. The first mode is a continuous wave modulation mode without depth linearization and the second mode is a continuous wave modulation mode with depth linearization. The depth estimates collected in the second mode using depth linearization are used to correct the depth estimates collected in the first mode.
Claims20
A method for time-of-flight depth imaging, comprising:
- emitting a light from a light source;
- capturing a first set of frames at an image sensor in a first mode;
- capturing a second set of frames at the image sensor in a second mode;
- estimating a first depth measurement in the first set of frames;
- and
- generating a corrected first depth measurement by adjusting the first depth measurement in the first set of frames based on the second set of frames.
An image processing system for time-of-flight depth imaging, comprising:
- a light source configured to emit light during a first time interval;
- an image sensor comprising a plurality of pixels, wherein the image sensor captures a first set of frames using a first mode, and the image sensor captures a second set of frames using a second mode;
- and
- a processor configured to determine first depth measurements in the first set of frames and generate corrected depth measurements using the second set of frames.
A camera apparatus for time-of-flight depth imaging, comprising:
- a light source configured to emit light;
- an image sensor comprising a plurality of pixels configured to receive reflected light,
- wherein the image sensor is further configured to capture a first set of frames using a first mode without harmonic cancellation, and capture a second set of frames using a second mode with harmonic cancellation, and
- wherein, for each subset of the first set of frames captured, one frame of the second set of frames is captured;
- and
- a processor configured to generate corrected depth measurements based on the first and second sets of frames.
Dependencies are inferred from the claim text.