Abstract: A coding apparatus includes a large block forming unit for forming a large block of sample values of an input signal, a small block forming unit for dividing the large block into a plurality of small blocks, a first coding unit for coding the small blocks of the input signal by using a difference signal obtained by subtracting a predicted value from the small blocks of the input signal, a second coding unit for coding the small blocks of the input signal without using the difference signal, and a selecting unit for selecting the first or second coding unit in units of large blocks.

Abstract: There is provided a coding apparatus which comprises a coding section for variable-length coding an input signal on a predetermined unit basis, an output section for outputting the data which was variable-length coded by the coding section on the predetermined unit basis, and an error correction adding section for adding an error correction code to the coded data outputted from the output section.

Abstract: There is provided code amount control in which information data are input in predetermined units and a code amount is estimated in each of a plurality of stages, including a final stage. A calculation result is obtained based on a target code amount and the estimated code amount, for each stage. A short code amount and an excess code amount are updated based on the calculation result, and quantization parameters used upon encoding are controlled in accordance with the short code amount and the excess code amount obtained at the final estimation stage. Also provided is code amount control for controlling a code amount in units of second blocks, each consisting of a plurality of first blocks, each consisting of a plurality of sample value data, which discriminates quantization parameters which result in a code amount less than a predetermined amount when a second block of data is encoded using the quantization parameters. The discriminated quantization parameters are adjusted on a unit basis of the first block.

Abstract: An image processing apparatus including: an input device for inputting image data; a first encoding device for encoding the image data with first parameter; a second encoding device for encoding the image data with second parameter; a first counting device for counting the first amount of encoded image data encoded by the first encoding device; a second counting device for counting second amount of encoded image data encoded by the second encoding device; and a calculating device for calculating third parameter, with which the image data is encoded to a predetermined amount of encoded data, in accordance with both of the first and the second amounts of encoded image data.

Abstract: An image processing apparatus comprises a receiving device for receiving encoded image data which is encoded by using orthogonal transform in a predetermined block unit, an error detecting device for detecting a transmission error of the encoded image data, a correcting device for correcting the transmission error in the predetermined block unit, and a decoding device for decoding the encoded image data and outputting image data for reproducing an image. The image processing apparatus satisfactorily controls the amount of compressed data and prevents a deterioration of image quality even if any error occurs on a transmission path, thereby reproducing good image quality.

Abstract: An image processing apparatus comprises a receiving device for receiving encoded image data which is encoded by using orthogonal transform in a predetermined block unit, an error detecting device for detecting a transmission error of the encoded image data, a correcting device for correcting the transmission error in the predetermined block unit, and a decoding device for decoding the encoded image data and outputting image data for reproducing an image. The image processing apparatus satisfactorily controls the amount of compressed data and prevents a deterioration of image quality even if any error occurs on a transmission path, thereby reproducing good image quality.

Abstract: An apparatus is provided for quantizing data obtained by transforming image data to a frequency zone so as to encode it. The speed at which such an apparatus performs processing is increased. Data is quantized on the basis of a plurality of coefficients C.sub.1 for controlling a quantizing step. As a result of the quantization, reference encoding data items Nb1 to Nb4 are obtained. Coefficients C5 to C7 for controlling the quantizing step are generated when image data which is delayed by one frame is quantized. At this time, the data items Nb1 to Nb4 are output by bit-shifting the result of the quantization.

Abstract: In an image display method and apparatus for displaying image data, it is determined, based upon a control code contained in received image data, whether the image data is whole image data in one frame or partial image data in one frame. When it is determined that the image data is partial image data, the content of a memory being displayed is transferred to another memory, and the partial image data is stored in the memory which is the destination of the transfer. When the transfer of the data to the memory which is the destination of the transfer ends, the content of this memory is read and displayed.

Abstract: A decoding device used in a predictive coding method includes a replacement circuit for replacing a decoded value corresponding to an encoded code having an uncorrectable error with the decoded value of the immediately preceding sample, and decoding of the succeeding sample is performed according to the decoded value output from the replacement circuit.

Abstract: An apparatus is provided for quantizing data obtained by transforming image data to a frequency zone so as to encode it. The speed at which such an apparatus performs processing is increased. Data is quantized on the basis of a plurality of coefficients C.sub.1 for controlling a quantizing step. As a result of the quantization, reference encoding data items Nb1 to Nb4 are obtained. Coefficients C.sub.5 to C.sub.7 for controlling the quantizing step are generated when image data which is delayed by one frame is quantized. At this time, the data items Nb1 to Nb 4 are output by bit-shifting the result of the quantization.

Abstract: In an image signal processing apparatus, first image data and second image data comprising a plurality of different sample data are input at the same time and are output sequentially following processing wherein data is subjected to thinning-out in direction horizontally of a screen so as to make locations of vertical direction screen data different from each other between the odd-number field period and the even-number field period. The thinned-out sample data are prediction-coded to output prediction-coded data, thus resulting in a substantial reduction of data quantity without deteriorating picture quality.

Abstract: A predictive coding device wherein a coding means for coding a difference between a sample value and a corresponding predictive value and outputting a coded code includes a memory storing at least one look-up table. The coding characteristics of the coded code can be changed, and at the same time, a control code associated with the coding characteristics is transmitted together with the coded code.

Abstract: Disclosed is an image information signal transmission apparatus wherein an image information signal in which one frame is constituted by a plurality of sample data is input, the input image information signal is divided into a plurality of blocks each consisting of a predetermined number of sample data, at least two types of reference value data associated with a dynamic range of sample data of each block is formed in units of blocks, the sample data of each block is coded by using the reference value data to form a plurality of first coded data in units of blocks, the plurality of first coded data formed in units of blocks are vector-quantized to form second coded data in units of blocks, and transmission data is formed by using as a transmission unit the reference data formed in units of blocks and the second coded data formed in units of blocks. The image information signal can be transmitted in a small information volume without degrading the image information signal.