Efficient detection of constant regions of an image
First Claim
1. A method for detecting a constant region of an image frame, comprising:
- determining, with at least one processor, that a first region of pixels in an image analysis window at a first position is a constant region;
in response to determining that the first region is a constant region;
determining, with the at least one processor, that a second region in the image analysis window at a second position is a constant region by analyzing a number of pixels in the second region that is less than a total number of pixels in the second region.
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Abstract
A technique that improves image analysis efficiency by reducing the number of computations needed to detect constant regions. Constant region detection according to the present techniques includes determining whether an image analysis window at a current position contains a constant region by analyzing a new line of pixels in the image analysis window if a pixel at a predetermined location in the image analysis window in the current position has a value equal to a pixel at the predetermined location from a previous position of the image analysis window. Analyzing only the new line of pixels saves the computational time that would otherwise go into analyzing all of the pixels in the image analysis window.
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Citations
20 Claims
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1. A method for detecting a constant region of an image frame, comprising:
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determining, with at least one processor, that a first region of pixels in an image analysis window at a first position is a constant region; in response to determining that the first region is a constant region; determining, with the at least one processor, that a second region in the image analysis window at a second position is a constant region by analyzing a number of pixels in the second region that is less than a total number of pixels in the second region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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an image buffer that holds an image frame; and an image processor that is configured to detect a constant region at a current position of the image frame by; determining that an entire area of an image analysis window at a previous position is a constant region; and in response to determining that the entire area of the image analysis window at the previous position is a constant region, determining that an entire area of the image analysis window at the current position is a constant region by analyzing a number of pixels in the image analysis window that is less than a total number of pixels in the image analysis window at the current position. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An image processing system comprising:
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means for holding an image frame; means for determining that a first region of pixels in an image analysis window at a first position is a constant region of pixels; means for shifting the image analysis window from the first position to the second position, wherein a second region in the image analysis window at the second position comprises a new line of pixels from the image frame that is different from any line of pixels in the image analysis window at the first position; means for detecting that the second region of the image analysis window at the second position is a constant region by analyzing a number of pixels in the second region that are less than a total number of pixels in the second region. - View Dependent Claims (18, 19, 20)
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Specification