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Abstract

An apparatus for decoding an encoded digital image signal having a data signal and an information signal, wherein the data signal includes a plurality of blocks of quantized transformed coefficients, each of the blocks including a DC coefficient and a predetermined number of AC coefficients, and said information signal includes each QS for each of the blocks, includes: an inverse quantizer for performing an inverse quantization on a subjective block with its corresponding QS to produce an inverse quantized DC coefficient and a plurality of inverse quantized AC coefficients; a candidate DC coefficient generator for determining a DC coefficient range and altering the value of the inverse quantized DC coefficient within the range to generate a predetermined number of candidate DC coefficients; a number of inverse discrete cosine transformer for performing inverse discrete cosine transformation on each of the candidate DC coefficients combined with the inverse quantized AC coefficients; and a comparator for comparing each of the results from the IDCT with previously performed IDCT results so as to enable the selection of an IDCT result producing a minimum blocking effect which occurs because of a luminance pixel difference between the previously performed IDCT results and the selected IDCT result.

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First Claim