Efficient detection of constant regions of an image
First Claim
1. An image processor that is configured to:
- determine that an entire area of an image analysis window at a previous position of an image frame 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,analyze, at a current position of the image frame, a number of pixels in the image analysis window that is less than a total number of pixels in the image analysis window; and
determine that an entire area of the image analysis window at the current position is a constant region based on the analysis of the number of pixels in the image analysis window that is less than the total number of pixels at the current position.
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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.
14 Citations
20 Claims
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1. An image processor that is configured to:
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determine that an entire area of an image analysis window at a previous position of an image frame 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, analyze, at a current position of the image frame, a number of pixels in the image analysis window that is less than a total number of pixels in the image analysis window; and determine that an entire area of the image analysis window at the current position is a constant region based on the analysis of the number of pixels in the image analysis window that is less than the total number of pixels at the current position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image processor that is configured to:
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determine that a first region of pixels from an image frame in an image analysis window at a first position is a constant region of pixels; shift the image analysis window from the first position to a 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; and detect 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 is less than a total number of pixels in the second region. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for detecting a constant region of an image frame comprising:
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determining that an entire area of an image analysis window at a previous position of an image frame is a constant region; in response to determining that the entire area of the image analysis window at the previous position is a constant region; analyzing, at a current position of the image frame, a number of pixels in the image analysis window that is less than a total number of pixels in the image analysis window; and determining that an entire area of the image analysis window at the current position is a constant region based on the analysis of the number of pixels in the image analysis window that is less than the total number of pixels at the current position. - View Dependent Claims (17, 18, 19, 20)
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Specification