Multilevel image encoding method

Abstract

Abstract PURPOSE:To decrease the difference between an original picture element value and a reproduction value of each picture element in the border of a block and inside the block, and to improve picture quality of a reproduction picture by obtaining a reference value of each picture inside the block, obtaining the difference between a picture element value and the reference value of each picture element inside the block, and encoding the difference and the reference value of the representative picture element. CONSTITUTION:An image is read by scanning and quantization is obtained by a reader 31. Four-scanning line picture information in the lower step of the read block is sent to a buffer memory 33B and it is accumulated. On the other hand, four-scanning line picture information in which the block belongs is accumulated in a buffer memory 33A and picture information of the block is sent to a code processing circuit 36. The processing circuit 36 reads necessary picture information from the memory 33A and memories 35A and 35B, and executes encoding of the block. The processing circuit 36 stores the code in a coding buffer memory 37 once, and sends the read code to a circuit by an MODEM39 through a transmitting controller 38. The processing circuit 36 reads necessary picture information from the memories 33A, 35A and 35B.

Inventors

• 👤 Yoshihiro Uno
• 👤 宇野　喜博

Bibliographic Details