Patent ID: 8842929
Filing Date: 2014-09-23
Classification: H04N

Abstract:
1. A method of analyzing an input signal, comprising the steps of: (A) calculating a plurality of transform coefficients corresponding to each of a plurality of blocks in said input signal at baseband; (B) calculating a plurality of sizes of said blocks, wherein at least two of said sizes are different from each other; (C) calculating a plurality of offsets of said blocks from a block grid; (D) calculating a plurality of sets of said transform coefficients, one of said sets corresponding to each respective one of said sizes and a respective one of said offsets; (E) calculating a plurality of histograms, one of said histograms corresponding to each respective one of said sets; and (F) calculating a plurality of quantization parameters based on at least one of said quantization parameters corresponding to each respective one of said blocks; (G) a generating information by performing a forensic analysis on said input signal, wherein said information describes a previous transform-based compression and subsequent decompression of said input signal based on said quantization parameters; and (H) storing said information in a nonvolatile memory.