Image analysis techniques
First Claim
1. 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;
for each respective pixel of a respective zone;
determining a pixel change value based on an average pixel value of the respective pixel over a plurality of frames; and
normalizing the pixel change value based on an average zone change value for the respective zone, wherein the average zone change value is based on the pixel change value for each pixel in the respective zone.
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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.
96 Citations
26 Claims
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1. A method comprising:
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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; for each respective pixel of a respective zone; determining a pixel change value based on an average pixel value of the respective pixel over a plurality of frames; and normalizing the pixel change value based on an average zone change value for the respective zone, wherein the average zone change value is based on the pixel change value for each pixel in the respective zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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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 value of each pixel in successive ones of the plurality of frames, wherein for each respective pixel of a respective zone the change in the pixel value is normalized based on an average pixel value of the respective pixel over the plurality of frames and an average of the changes in pixel values of each pixel in the respective zone. - View Dependent Claims (17, 18, 19, 20)
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21. An apparatus comprising:
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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; for each respective pixel of a respective zone; determine a pixel change value based on an average pixel value of the respective pixel over a plurality of frames; and normalize the pixel change value based on an average zone change value for the respective zone, wherein the average zone change value is based on the pixel change value for each pixel in the respective zone. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification