| 摘要 |
PURPOSE:To attain band compression with high efficiency, by changing an interval taking a difference depending on increase/decrease in the transmission information amount and increasing or decreasing the number of picture elements to be transmitted. CONSTITUTION:Picture information consisting of fields enters an A/D converter 1, where it is digitized and enters sequentially field memories 2, 3. The difference is obtained at operators 4, 5 from points corresponding to the output memory of the A/D converter 1 and the field memories 2, 3. When the difference is large, the difference among all fields is calculated at a coder and controller 6 and transmitted, and when the difference is zero or nearly zero, the difference is calculated at each other field, and the difference is transmitted at an interval of prescribed difference, and further, when the difference is a middle value, the difference is transmitted at every other field. |
