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US 8,274,710 B2Granted
Image processing using count variation
AssigneeCanon Kabushiki Kaisha
InventorsTakaaki Yano, Hirokazu Tamura, Atsushi Matsumoto
Life of this patent
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Abstract
Input image data is converted into a brightness component to obtain a difference between the brightness component and a threshold. A count variation is determined based on the obtained difference, and the counter is used to follow up and change the threshold. The threshold obtained by the follow-up and change is used to execute a background color removal process in each pixel by executing a signal conversion process.
Claims23
An image processing apparatus comprising:
- a determining unit configured to determine a count variation for a pixel in image data according to a difference between a brightness component of the pixel in the image data and a predetermined threshold;
- a threshold changing unit configured to change the threshold based on a result of accumulating the count variation for each pixel in the image data;
- and
- a background level determining unit configured to determine the threshold changed by the threshold changing unit as a background level of the pixel in the image data,
- wherein the determining unit makes the count variation smaller as the difference becomes larger.
2 more elements
An image processing method comprising:
- determining a count variation for a pixel in image data according to a difference between a brightness component of the pixel in the image data and a predetermined threshold;
- changing the threshold based on a result of accumulating the count variation for each pixel in the image data;
- and
- executing a background level determination process by determining the threshold changed in the changing as a background level of the pixel in the image data,
- wherein the count variation is made smaller as the difference becomes larger.
2 more elements
Dependencies are inferred from the claim text.