Nippon Hoso' Kyokai

Yoshiaki Shishikui

Shinichi Sakaida

Yoshimichi Ohtsuka

Atsuro Ichigaya

Yuichi Ninomiya

Hiroshi Nakanishi

Osamu Mizuno

Yoshinori Izumi

Seiichi Gohshi

Kazuhisa Iguchi

Yukihiro Nishida

Yasuaki Kanatsugu

Eisuke Nakasu

Hiroyuki Imaizumi

Wentao Zheng

In the present invention, at least two component signals that represent luminance and a color difference in an original signal having a predetermined image format are encoded/decoded. This encoding device () is equipped with: a local decoding section (------) that generates a locally decoded signal of a second component signal; a luminance-color difference prediction unit () that generates a parameter for normalizing the second component signal by comparing the original signal of a first component signal not yet encoded with the locally decoded signal of the second component signal in order to generate a luminance-color difference prediction signal; a prediction signal generation unit (-) that generates a prediction signal for an intra-screen prediction or a prediction signal for an inter-screen prediction regarding the first component signal; a synthesis unit () that performs a weighted addition of the prediction signal and the luminance-color difference prediction signal in order to generate a corrected prediction signal for the first component signal; and an encoding section (----) that generates and encodes a difference signal between the corrected prediction signal and the original signal of the first component signal.

Encoding device, decoding device, and program

An apparatus for coding a binary image representing an object shape includes an inferior symbol detecting unit which decides which one of binary zero and binary one is an inferior symbol that is of smaller occurrence within a given area of the binary image, a divided portion generating unit which divides a rectangular block of the given area into divided portions, a map information generating unit which generates map information for each one of the divided portions, the map information indicating whether a corresponding one of the divided portions has the inferior symbol included therein, and a coding unit which encodes only the divided portions that have the inferior symbol included therein, wherein an identification of the inferior symbol, the map information, and the encoded divided portions are output from the apparatus.

Apparatus and method for coding binary image with improved efficiency

A method of coding and transmitting moving pictures includes the steps of coding an extended background image, coding parameters indicative of an image area within the extended background image, coding a foreground picture that is to be composed with a background picture corresponding to the image area indicated by the parameters, coding a defocus value indicative of an extent to which the background picture should blur, and transmitting the coded extended background image, the coded parameters, the coded foreground picture, and the coded defocus value as a data stream to a decoder side. Coding and transmitting of the defocus value makes it possible to defocus the background picture at the decoder end, thereby producing a composed image of the background picture and the foreground picture having natural appearance.

Coding and decoding of moving pictures based on sprite coding

A system for performing high efficiency coding of an image signal includes a differential signal generating section, a processing section, a supply section, a coefficient train outputting section, and a code assigning section. The differential signal generating section generates a differential image signal between a current image signal inputted thereto and a prediction image signal inputted thereto for the current image signal with respect to a target block. The current image signal and the differential image signal each include a plurality of blocks and the target block is one of the plurality of blocks. The processing section executes processing of a one-dimensional orthogonal transform and a quantization for an inputted objective image signal, with respect to the target block, to generate the processing result as quantization coefficients. The supply section supplies the processing section with the differential image signal as the objective image signal with respect to the target block. The coefficient train outputting section generates a quantization coefficient train from the quantization coefficients. The code assigning section assigns a code to each quantization coefficient of the train to generate a transmission signal.

Method of performing high efficiency coding of image signal and system

The motion detection circuit is so constructed that an interframe difference signal is passed through a horizontal direction LPF and a vertical direction LPF in cascade connection, and the interframe difference signal thus obtained is divided by the value obtained by mixing an edge signal of an image and the image level signal of the image by a mixing circuit, thus providing a motion signal.

Motion detection circuit

Growing community of inventors

Tokyo, Japan

Yoshiaki Shishikui