| 摘要 |
<p>PURPOSE:To relaize a high-efficiency picture transmission system through which the transmission quantity can be reduced without lowering the picture quality. CONSTITUTION:The transmission side and the reception side are shown in (a) and (b) respectively. The output signal of picture input device 1 is digitized via A-D converter 2 and then memorized in memory unit 3. Roughness/fineness decision circuit 4 decides the rough and fine areas of the picture. Then the roughness/fineness boundary information is encoded through encoder 5, and at the same time the picture encoding is given to the rough and fine areas decided by encoder 6 and 7. These encoded signals are stored once into buffer memory 8 and then sent to modulator 9 every picture frame to be modulated and transmitted. The transmitted modulated picture signals are decoded by decoder 11 and then stored in buffer memory 12; and the boundary information of the rough and fine areas is decoded through decoder 13 to be sent to control circuit 14. Based on this information, the control is given to the rough and fine parts of the information supplied to decoder 15 and 16 from memory 12, thus obtaining the picture information at memory 17.</p> |
