abstract |
A picture decoder for decoding encoded picture data obtained by compressing and encoding picture data of an interlaced image by high-efficiency encoding means. An image decoder having an OSD data memory area and an encoding data buffer area of 1,835,008 bits or more and having a different size. In order to have 16 Mbits of memory in which the decoding operation of the encoding data is successively performed at the connection portion of the encoded data, a plurality of image data memory layers corresponding to the number according to the size of the encoded image are included. Two reference picture data memory areas having a capacity of at least one frame, at least a display data memory area for converting frame structure data to field structure data, an encoded data buffer area for temporarily storing encoded data, and an OSD overlaid on the decoded image (on-sc a memory means having another memory region pattern having an OSD data region for storing reen-data and one of the image data memory layers of the memory means automatically selected according to the size of the encoded image so that the size of the encoded image is small In the case where the capacity of the display data area is at least one frame and the size of the encoded image is large, control means is provided so that the capacity of the display data area is smaller than one frame.n n n As a result, a large buffer area for encoding data and an OSD data area sufficient to store a large PAL image can be provided within a 16-bit capacity. |