METHODS AND APPARATUS TO DETECT A BLANK FRAME IN A DIGITAL VIDEO BROADCAST SIGNAL
First Claim
Patent Images
1. A method of detecting a blank image comprising:
- analyzing a compressed frame of a tuned digital broadcast signal to determine if the frame is a blank candidate; and
analyzing a portion of the blank candidate to determine if the blank candidate is a blank image.
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Accused Products
Abstract
Methods and apparatus to detect blank images in a digital video broadcast signal are disclosed. An example method of detecting a blank image includes analyzing DC values of luminance blocks associated with a frame to determine a number of the luminance blocks having substantially the same DC value; and identifying the frame as a blank image if the number exceeds a predetermined threshold.
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Citations
33 Claims
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1. A method of detecting a blank image comprising:
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analyzing a compressed frame of a tuned digital broadcast signal to determine if the frame is a blank candidate; and
analyzing a portion of the blank candidate to determine if the blank candidate is a blank image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15)
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8. A method as defined in claim 8 wherein analyzing the bit allocations of the rows of the frame comprises determining if at least a predetermined percentage of the rows are allocated less than a predetermined number of bits.
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16. An apparatus to detect a blank image comprising:
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a blank frame candidate identifier to analyze a compressed frame of a tuned digital broadcast signal to determine if the frame is a blank candidate; and
a blank frame tester to analyze a portion of the blank candidate to determine if the blank candidate is a blank image. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of detecting a blank image comprising:
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receiving a compressed digital image including a plurality of DC values;
determining a number of DC values in the plurality of DC values that meet a predetermined criterion;
comparing the determined number of DC values meeting the predetermined criterion to a predetermined threshold; and
identifying the received digital image as a blank image if the determined number of DC values exceeds the predetermined threshold. - View Dependent Claims (28, 29, 30, 31, 32)
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33-86. -86. (canceled)
Specification