Baseband signal quantizer estimation

摘要

A method of deblocking an input signal is disclosed. The method generally includes the steps of (A) calculating a plurality of transform coefficients corresponding to each of a plurality of blocks in the input signal at baseband, (B) calculating a plurality of quantization parameters based on the transform coefficients, at least one of the quantization parameters corresponding to each respective one of the blocks and (C) generating an output signal by deblocking the input signal based on the quantization parameters.

主权项

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
(i) said transform coefficients,(ii) said sizes(iii) said offsets, and(iv) a particular one of said histograms having a widest separation between two peaks as compared to other peaks in said histograms, 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.