| 摘要 |
PURPOSE:To show an enough noise smoothing effect at a dynamic area, and to prevent the generation of an unnecessary encoding data at a static area by applying an adaptive control on a smoothing characteristic in an adaptive spatial filter. CONSTITUTION:An input picture signal 13 is digitized at an AD converter 1, and a vector data 14 can be obtained at a raster/block scanning conversion circuit 2. The vector data 14 is subtracted a preceding frame vector 15 in which an adaptive spatial filter 8 is applied on a preceding frame vector 23 within a frame memory 7, and an inter-frame differential input vector 16 can be obtained. The smoothing characteristic of the adaptive spatial filter 8, similarly as a threshold value control for a motion detection circuit 4, is controlled by every frame with a parameter 24 corresponding to a data quantity within a transmission data buffer 5. A vector quantization encoder 3 encodes the inter- frame differential input vector 16 decided as effective, and an encoding data 17 is written at the transmission buffer 5.
|
