Image analysis techniques
AssigneeCree, Inc.
InventorJohn Roberts
Life of this patent
Estimating the term…
Abstract
A frame is obtained from an image sensor. The frame may include a number of zones, each of which in turn includes a number of pixels. Each one of the pixels may be associated with a pixel value. A pixel change value for each one of the pixels in the frame may be determined based on an average pixel value of the pixel over a number of frames. The pixel change value for each pixel may then be normalized based on an average zone change value for the zone in which the pixel is located. The average zone change value may be based on the pixel change value for each one of the pixels in the zone. By using the average zone change value to normalize the pixel change value, an image frame may be analyzed in an efficient and fast manner.
Claims26
A method comprising:
- obtaining a frame from an image sensor, the frame comprising a plurality of zones, wherein each one of the plurality of zones comprise a plurality of pixels and each one of the plurality of pixels is associated with a pixel value;
- determining a pixel change value for each of the plurality of pixels in the frame based on an average pixel value of the pixel over a plurality of frames;
- and
- normalizing the pixel change value based on an average zone change value for the one of the plurality of zones in which the one of the plurality of pixels is located, wherein the average zone change value is based on the pixel change value for each of the plurality of pixels in the zone.
A method comprising:
- obtaining a plurality of frames from an image sensor, each one of the plurality of frames comprising a plurality of zones, wherein each one of the plurality of zones comprise a plurality of pixels and each one of the plurality of pixels is associated with a pixel value;
- and
- determining if an occupancy event has occurred by analyzing normalized changes in the pixel values for each pixel in successive ones of the plurality of frames, wherein the changes in pixel values are normalized based on an average pixel value of the pixel over the plurality of frames and an average of the changes in the pixel values of the pixels in the zone in which the pixel is located over the plurality of frames.
An apparatus comprising:
- an image sensor;
- processing circuitry;
- and
- a memory storing instructions, which, when executed by the processing circuitry cause the apparatus to:
- obtain a frame from the image sensor, the frame comprising a plurality of zones, wherein each one of the plurality of zones comprises a plurality of pixels and each one of the plurality of pixels is associated with a pixel value;
- determine a pixel change value for each of the plurality of pixels in the frame based on an average pixel value of the pixel over a plurality of frames;
- and
- normalize the pixel change value based on an average zone change value for the one of the plurality of zones in which the one of the plurality of pixels is located, wherein the average zone change value is based on the pixel change value for each of the plurality of pixels in the zone.
Dependencies are inferred from the claim text.