An image information transmission system for transmitting multi-pixel frames of image information, upon transmission, the data corresponding to a frame are divided into blocks each containing a predetermined number of pixel data, and discrimination data are prepared by discriminating whether each block belongs to a moving image area or a still image area of the frame. The data of a block of a moving image area are encoded using only the data of that block and according to a first encoding method, to form first encoded data. The data of a block of a still image area are encoded using the data of that block and those of other blocks, and according to a second encoding method, to form second encoded data. Transmission data are prepared from the encoded data and the discrimination data, and are sent to the transmission channel. At the receiving side, the encoded data and discrimination data are separated from the transmission data, and the encoded data are decoded either by a first or a second decoding method corresponding respectively to the first or a second decoding method, according to the separated discrimination data, to restore the original pixel data. This process reduces the amount of information to be transmitted while suppressing deterioration of the image information.
This application is a continuation of application Ser. No. 07/602,921, filed Oct. 25, 1990, which was a continuation of application Ser. No. 07/275,504, filed Nov. 23, 1988.
Priority Data
Dec 01, 1987 [JP] 62-301553 Oct 05, 1988 [JP] 63-252763
The invention provides a fixed length cell handling image communication method wherein moving picture data are compressed to data having a fixed transmission rate using a compression method for still pictures and then converted into fixed length cells so that image processing such as compression/decompression of the moving picture data can be performed at a high rate while keeping a high compression ratio and a high picture quality. A transmission apparatus for use with the method includes an image data compression section for performing still picture compression processing for moving picture data, which define information of a plurality of screens individually divided into a plurality of fields to be successively transmitted per unit time, in response to field timing information representative of a compression timing of each field to convert the moving picture data into variable length data which are independent of each other, a transmission buffer section for converting the variable length data into fixed length data having a fixed transmission rate, and a fixed length cell transmission section for placing the fixed length data and the field timing information into data parts of fixed length cells and transmitting the fixed length cells.
A method and an apparatus are provided for encoding frames of image data. Selected blocks one frame in a sequence are encoded with one or more quantization levels in a first range, and selected other blocks in the one frame are bypassed. In a frame that follows the one frame, the blocks corresponding to the bypassed blocks are encoded with one or more quantization levels in a second range of quantization levels, and the other blocks are bypassed for encoding.
In an image coding method, a picture is divided into blocks composed of adjacent plural pixels, and a reference picture is used to predict the picture to be coded. A block including an image region not existing in the reference picture, i.e. newly appearing in the picture to be coded by the movement of an object included in the picture, is detected as an independent block, and the independent block is coded independently, without prediction from the reference picture.
Apparatus and method for processing a digital video signal having an inner block of pixel data that represents an image spatially located within an outer block of pixel data. A class code of the inner block of pixel data is determined in accordance with values of the pixels of both the inner and outer blocks; and coefficient data which corresponds to the class code of the inner block is retrieved from a memory and is used with the digital video signal to generate interpolated data to produce, for example, a high definition digital video signal.
A picture encoding and/or decoding system adaptively changes encoding manner in discrete cosine transformation or predictive coding for improving a picture quality of transmission picture. A variable length coding method is changed in accordance with the change between the discrete cosine transformation and predictive coding. When discrete cosine transforming, a combination of a zero run length and a pixel value is effected two dimensional variable length coding. When predictive coding, a combination of a zero run length and a difference value between pixel values is effected two dimensional variable length coding. When predictive coding, a predictive value of a block and a quantization width are transmitted.
