The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 1997
Filed:
Apr. 28, 1995
Sang-Ho Kim, Seoul, KR;
Daewoo Electronics Co., Ltd., Seoul, KR;
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.