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US 9,313,412 B2Granted
Image sensor and operating method thereof
AssigneePixart Imaging Inc.
InventorsChuan-Hsin Lee, Wen-Han Yao
Life of this patent
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Abstract
There is provided an image sensor including a light sensitive device and a digital signal processing circuit. The light sensitive device is configured to output a digital image. The digital signal processing circuit is configured to detect at least one feature point in the digital image and calculate a feature point coordinate of the at least one feature point.
Claims6
An image sensor, comprising:
- a light sensitive device comprising:
- a light sensing array sensing light beams impinging thereon to generate an image signal, and having an output terminal to output the image signal, and
- an analog-to digital converter having an input terminal electrically coupled to the output terminal of the light sensing array for receiving the image signal, and converting the image signal into a digital image;
- a memory, and
- a digital signal processing circuit electrically coupled to the light sensitive device and the memory configured for
- receiving the digital image from the light sensitive device,
- detecting corner coordinates of at least one corner feature in the digital image for storage within the memory,
- calculating a corner response value corresponding to each of the stored corner coordinates, and
- sequentially scanning the digital image with a predetermined pixel range and removing, from the memory, the stored corner coordinates that do not have a maximum response value among the stored corner coordinates located within the predetermined pixel range.
6 more elements
Dependencies are inferred from the claim text.