Classifying an image's compression level
First Claim
Patent Images
1. A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform a method of classifying a compressed input image'"'"'s compression level, comprising:
- applying inverse quantization to discrete cosine transform (DCT) coefficients extracted from the compressed input image giving rise to dequantized DCT coefficients;
identifying a lowest absolute non-zero DCT coefficient among said dequantized DCT coefficients;
applying a threshold to said dequantized DCT coefficients,wherein said applying a threshold includes applying a threshold to said lowest absolute non-zero DCT coefficient; and
determining a compression level classification for said compressed input image according to a relation among said threshold and at least one of said dequantized DCT coefficients,wherein said determining a compression level classification, comprises determining a compression level classification for said compressed image according to a relation among said threshold and said lowest absolute non-zero DCT coefficient.
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Abstract
A method of classifying a compressed input image'"'"'s compression level, comprising applying inverse quantization to DCT coefficients extracted from the compressed input image, giving rise to dequantized DCT coefficients, applying a threshold to the dequantized DCT coefficients, and determining a compression level classification for the compressed input image according to a relation among the threshold and at least one of the dequantized DCT coefficients.
90 Citations
30 Claims
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1. A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform a method of classifying a compressed input image'"'"'s compression level, comprising:
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applying inverse quantization to discrete cosine transform (DCT) coefficients extracted from the compressed input image giving rise to dequantized DCT coefficients; identifying a lowest absolute non-zero DCT coefficient among said dequantized DCT coefficients; applying a threshold to said dequantized DCT coefficients, wherein said applying a threshold includes applying a threshold to said lowest absolute non-zero DCT coefficient; and determining a compression level classification for said compressed input image according to a relation among said threshold and at least one of said dequantized DCT coefficients, wherein said determining a compression level classification, comprises determining a compression level classification for said compressed image according to a relation among said threshold and said lowest absolute non-zero DCT coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A computer program product comprising a computer useable medium having computer readable program code embodied therein of classifying a compressed input image'"'"'s compression level, the computer program product comprising:
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computer readable program code for causing the computer to apply inverse quantization to discrete cosine transform (DCT) coefficients extracted from the compressed input image giving rise to dequantized DCT coefficients, computer readable program code for causing the computer to identify a lowest absolute non-zero DCT coefficient among said dequantized DCT coefficients; computer readable program code for causing the computer to apply a threshold to said dequantized DCT coefficients, the computer readable program code for causing the computer to apply a threshold including computer readable program code for causing the computer to apply a threshold to said lowest absolute non-zero DCT coefficient; and computer readable program code for causing the computer to determine a compression level classification for said compressed input image according to a relation among said threshold and at least one of said dequantized DCT coefficients, the computer readable program code for causing the computer to determine a compression level classification including computer readable program code for causing the computer to determining a compression level classification for said compressed image according to a relation among said threshold and said lowest absolute non-zero DCT coefficient.
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30. A computerized apparatus for classifying a compressed input image'"'"'s compression level, comprising:
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an inverse quantizer adapted to apply inverse quantization to discrete cosine transform (DCT) coefficients extracted from the compressed input image giving rise to dequantized DCT coefficients; a configuration module adapted to provide a classification threshold associated; and a DCT-domain classifier adapted to identify a lowest absolute non-zero DCT coefficient among said dequantized DCT coefficients, adapted to apply the classification threshold to the dequantized DCT coefficients including applying the classification threshold to said lowest absolute non-zero DCT coefficient, and adapted to determine a compression level classification for the compressed input image according to a relation among the classification threshold and at least one of the dequantized DCT coefficients including determining the compression level classification for said compressed image according to a relation among said threshold and said lowest absolute non-zero DCT coefficient.
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Specification