Image distribution apparatus, communication terminal apparatus, and control method thereof
First Claim
1. An image distribution apparatus that divides image data for a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data to an external apparatus, comprising:
- a) an acquiring unit for acquiring the quantized transformation coefficients;
b) a storage unit for storing the quantized transformation coefficients acquired by said acquiring unit;
c) a calculation unit for calculating differences between quantized transformation coefficients of a first frame stored in said acquiring unit and quantized transformation coefficients of a second frame stored in said acquiring unit;
d) a changing block count unit for counting the number of blocks whose difference values calculated by said calculation unit are equal to or greater than a predetermined value, as changing blocks of the first frame; and
e) a detection unit for detecting a changing frame by determining that the first frame has changed when the number of blocks counted by the changing block count unit is equal to or greater than a predetermined value.
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Accused Products
Abstract
An image distribution apparatus divides image data of a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data. The image distribution apparatus acquires the quantized transformation coefficients, stores the acquired transformation coefficients in a storage unit, calculates differences between the transformation coefficients of a first frame and the transformation coefficients of a second frame stored in the storage unit in a unit of block, counts blocks whose difference values calculated above are equal to or greater than a predetermined value as changing blocks of the first frame, and determines that the first frame has changed when the counted number of blocks is equal to or greater than a predetermined value.
41 Citations
18 Claims
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1. An image distribution apparatus that divides image data for a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data to an external apparatus, comprising:
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a) an acquiring unit for acquiring the quantized transformation coefficients; b) a storage unit for storing the quantized transformation coefficients acquired by said acquiring unit; c) a calculation unit for calculating differences between quantized transformation coefficients of a first frame stored in said acquiring unit and quantized transformation coefficients of a second frame stored in said acquiring unit; d) a changing block count unit for counting the number of blocks whose difference values calculated by said calculation unit are equal to or greater than a predetermined value, as changing blocks of the first frame; and e) a detection unit for detecting a changing frame by determining that the first frame has changed when the number of blocks counted by the changing block count unit is equal to or greater than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image distribution apparatus that divides image data of a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data to an external apparatus, comprising:
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a) a decoding unit for decoding the coded transformation coefficients; b) a storage unit for storing the decoded transformation coefficients; c) a calculation unit for calculating differences between transformation coefficients of a first frame and transformation coefficients of a second frame stored in said storage unit; d) a changing block count unit for counting the number of blocks whose difference values calculated by said calculation unit are equal to or greater than a predetermined value, as changing blocks of the first frame; and e) a detection unit for detecting a changing frame by determining that the first frame has changed when the number of blocks counted by the changing block count unit is equal to or greater than a predetermined value. - View Dependent Claims (14)
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15. A control method for an image distribution apparatus that divides image data of a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data to an external apparatus, comprising:
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a) an acquiring process of acquiring the coded transformation coefficients; b) a storage process of storing the transformation coefficients acquired by the acquiring process; c) a calculation process of calculating differences between transformation coefficients of a first frame and transformation coefficients of a second frame stored by said storage process; d) a changing block count process of counting the number of blocks whose difference values calculated by said calculation process are equal to or greater than a predetermined value, as changing blocks of the first frame; and e) a detection process of detecting a changing frame by determining that the first frame has changed when the number of blocks counted by the changing block count process is equal to or greater than a predetermined value. - View Dependent Claims (16)
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17. A control method for an image distribution apparatus that divides image data of a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data to an external apparatus, comprising:
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a) a decoding process of decoding the coded transformation coefficients; b) a storage process of storing the decoded transformation coefficients; c) a calculation process of calculating differences between transformation coefficients of a first frame and transformation coefficients of a second frame stored by said storage process; d) a changing block count process of counting the number of blocks whose difference values calculated by said calculation process are equal to or greater than a predetermined value, as changing blocks of the first frame; and e) a detection process of detecting a changing frame by determining that the first frame has changed when the number of blocks counted by said changing block count process is equal to or greater than a predetermined value. - View Dependent Claims (18)
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Specification