A transmission system, of the type wherein input data to be transmitted is stored in blocks and less than all stored data is extracted from the blocks for transmission and the extracted data is subjected to interpolation to restore all of the data, includes computing circuits for obtaining respective differences between input data and restored data and between input data and stored data and the sums of such differences, and further computing and comparison circuits operating with such differences sums to effect selective transmission of the input data or the extracted data.
A highly efficient coding apparatus comprises a, circuit (2) for block-segmenting picture element data in areas belonging to each of continuous n (n.gtoreq.2) frames of digital picture signals, switching circuit (9) for switching in a block unit, a first mode where all picture element data in the n frames of each block is transmitted and a second mode where picture element data in m frames of the n frames is transmitted, a circuit (12, 13 and 14) for detecting, in the second mode, a difference between an interpolation value which interpolates non-transmission data of an objective block from at least picture element data of the objective block to be transmitted and a real value of the non-transmission data, a control signal generating circuit (17) for generating a control signal for the switching circuit (9) on the objective block based on an output of the detecting circuit (12, 13 and a 14), and circuit (10) for transmitting transmission data of an output of the switching circuit (17) and the control signal SJ.
In program retrieval using a magnetic tape in which programs are classified by index signals recorded on the tape, an image at the beginning of each program is displayed in a list on a multi-screen, and a desired program is directly selected using a count value of index signals. In recording, an index signal is recorded at a starting point of recording. When preparing a multi-screen at the time of reproducing, an image reproduced a predetermined time after detection of an index signal is reduced and stored in a memory.
There is provided a method for automatically set a spatial resolution for an image to be encoded by properties of an image during an encoding process. The method includes the steps of dividing the moving image into blocks and compression encoding the moving image for each of the blocks, decoding an encoded moving image, obtaining a block distortion ratio from a decoded image, and making a resolution decision to select a first resolution lower than a current spatial resolution if the block distortion ratio is greater than a first threshold value or a second resolution higher than the current spatial resolution if the block distortion ratio is smaller than a second threshold value.
A similarity measure is generated as a function of a plurality of values corresponding to a region of an image. An encoding mode is then selected in accordance with the similarity measure and the region is encoded in accordance with the selected encoding mode.
A method and apparatus for decoding image data. Before decoding, the image data has an OPERATING SYSTEM header, a BITSTREAM header, a Y-COMPONENT DATA field, a U-COMPONENT DATA field, and a V-COMPONENT DATA field. Each of the DATA fields has a four-byte MC VECTOR COUNT field, an MC VECTORS field, and an ENCODED DATA field that has interleaved binary tree codes and region codes.
