Orthogonal transform coding method for picture data

Abstract

Abstract PURPOSE:To prevent the occurrence of block distortion by encoding a picture data that is used as the boundary of a block without applying an orthogonal transformation, and performing a smoothing between both picture data. CONSTITUTION:A picture data (x) on which a preceding process has been applied is extracted by every data x1 that constitutes a prescribed block, and every data x2 that is used as the boundary of the block. The picture data x1 is passed through an orthogonal transformation circuit 12, and receives a two-dimensional orthogonal transformation, and an encoded data f(y1) is recorded on a recording and reproducing device 14. The picture data x2 is recorded on the recording and reproducing device 14 as the data having the same code length. When a picture is reproduced, the picture data x2 and the picture data f(y1) are read out, and a restored picture data x1 and the picture data x2 are synthesized, and the peripheral part of the boundary is reproduced receiving a smoothing process.

Inventors

• 👤 Yasuyuki Tanaka
• 👤 庸之 田中

Bibliographic Details