Mitsubishi Denki Kabushiki Kaisha

Hitachi, Ltd.

Mitsubishi Electric Corporation

Tadashi Kasezawa

Hidetoshi Mishima

Masato Nagasawa

Yoshinori Asamura

Yoshiko Hatano

Yoshinobu Ishida

Hiroyuki Oohata

Satoshi Kurahashi

Shuji Sotoda

Takahiro Nakai

Masahiro Kazayama

Kouichi Shirakawa

Hiroyuki Ohata

Yoshihiro Kiyose

Kenichi Asano

Takashi Shinohara

Masaharu Yao

Koji Okazaki

Hiromu Hasegawa

Hiroshi Ito

Ikuya Arai

Masahiko Yoshimoto

Shigeru Hirahata

Toshinori Murata

Isao Nakagawa

Hiroshi Itoh

Masato Sugiyama

Kazuhiro Kaizaki

Noriyuki Yamaguchi

Yoshiki Mizutani

Takuzi Kurashita

In a video disk recording/playback device for converting a digital video signal or the like into high-efficiency coded data and recording the coded data on a video disk, or for restoring high-efficiency coded data recorded on the video disk and reproducing an output image, wherein said digital video signal is composed of a succession of video signals of a plurality of frames and including an I picture encoded within a frame, a P picture interframe coded by forward motion compensation with reference to said I picture and/or another P picture, and a B picture interframe coded by motion compensation in both directions with reference to said I and/or P pictures temporally preceding and succeeding the B picture, there are further provided a means for recording in an image information table set up on said video disk all of the start addresses of coded data representing selected images such as images to be retrieved and the start addresses of data containing information required for reproducing the coded data. With the above configuration, retrieval of all kinds of images of I, P, and B pictures is possible by recording all of the start addresses of coded data representing selected images such as images to be retrieved and the start addresses of data containing information required for reproducing the coded data in the image information table on the video disk.

Disk media, and method of and device for recording and playing back information on or from a disk media

A digital video signal record and playback device for recording on a recording medium a digital video signal coded by using a motion compensation prediction and an orthogonal transform and playing back data from the recording medium. In a data arrangement of a digital video signal, an I picture which can be independently represented in a picture is divided into n areas in the vertical direction, and the data is arranged from the front of one GOP in the unit of area by giving a priority to an area located at the center of the screen. A playback picture is outputted by playing back the I picture read from the recording medium in the unit of area unit. In the case where the whole I picture area cannot be read within a definite time, the area which cannot be read are interpolated by the use of the data of the preceding screen.

Digital video signal record and playback device and method for selectively reproducing desired video information from an optical disk

An encoding preprocessing partextracts the amount of image feature relative to image data and passes the amount of image feature to a control partas image feature amount informationand also sends image datato an encoding partThe control partdetermines whether there is a dissolve image or not based on the image feature amount informationand if it is determined that the image datais the dissolve image, an encoding parameteris set so that a configuration of GOP which is normally M=3 is changed into the configuration of GOP of M=2, and the encoding partperforms encoding based on the encoding parameterAs a result of that, a prediction error of a B-picture frame in a dissolve interval becomes substantially zero and on encoding in the dissolve interval, the amount of information occurrence in frames except I-picture and P-picture frames can be reduced and thus the amount of information occurrence as a whole can be reduced.

Moving image encoding apparatus and moving image encoding method

An image encoding system according to this invention comprises: a global motion detecting unit for detecting a motion of the whole picture screen between a reduction image of a present frame and a reduction image of a reference frame and for outputting global motion information; and an image encoding unit for performing a motion detection within a peripheral narrow retrieving range on the basis of the global motion information and for encoding an image by using a motion compensation prediction. As a result, an amount of arithmetic operation in the motion detection of the image encoding unit can be reduced.

Image encoding system

Digital video signal record and playback device and method for giving priority to a center of an I frame

Disk media, and method of and device for playing back information on or from a disk media

The video signal encoding device comprises an encoding frame pulse generating means for generating an encoding frame pulse on the basis of a video input frame pulse signal and a video input clock signal input thereto, as well as a video signal rearranging means for rearranging the frame order of video input signals, together with a video signal write control means and a read control means; wherein the encoding frame pulse generating means generates the encoding frame pulse first by setting a reference phase in accordance with the video input frame pulse, and thereafter dividing the frequency of the video input clock signal to a predetermined number of clock pulses. The video signal read control means controls the read operation of the video signals stored in the video signal rearranging means on the basis of the encoding pulse signal generated by said frame pulse generating means and the video input clock signal.

Video signal encoding device

In an image signal encoding method for encoding an image signal using motion compensation, a motion vector is found by means of a block matching method, a first distortion SEmc of motion compensated prediction associated with the motion vector, and a second distortion SEnomc of prediction without motion compensation are detected, the motion vector is used for for inter-picture prediction encoding when SEnomc>SEmc&plus;K, with K being a constant greater than 0, and a vector having a value zero is used, in place of the motion vector, for inter-picture prediction encoding when SEnomc&lE;SEmc&plus;K. In another aspect, a speed of motion in a sequence of pictures is detected, and for a part of the sequence of pictures detected to contain a quick motion, the prediction encoding is performed using one-way prediction encoding, and for a part of the sequence of pictures without a quick motion, prediction encoding is performed using bi-directional prediction encoding. In another aspect, the image signal is subsampled for each field, and a motion vector is determined using the field-subsampled image signal.

Video signal encoding method and system

The frame synchronizer outputs, when reading out each of the video signals stored in a plurality of frame memories provided in a frame synchronizing circuit one by one, a read control signal from a video signal read control circuit for controlling the frame synchronizing circuit in such a manner as to read out a video signal of a frame other than that of a target frame which was to be read out otherwise, in case the input/output frame phase difference output from an input/output frame phase difference detecter comes up to an amount of one frame.

Frame synchronizer

Digital video signal record and playback device and method for giving

In an image signal encoding method for encoding an image signal using motion compensation, a motion vector is found by means of a block matching method, a first distortion SEmc of motion compensated prediction associated with the motion vector, and a second distortion SEnomc of prediction without motion compensation are detected, the motion vector is used for for inter-picture prediction encoding when SEnomc&gt;SEmc+K, with K being a constant greater than 0, and a vector having a value zero is used, in place of the motion vector, for inter-picture prediction encoding when SEnomc.ltoreq.SEmc+K. In another aspect, a speed of motion in a sequence of pictures is detected, and for a part of the sequence of pictures detected to contain a quick motion, the prediction encoding is performed using one-way prediction encoding, and for a part of the sequence of pictures without a quick motion, prediction encoding is performed using bi-directional prediction encoding. In another aspect, the image signal is subsampled for each field, and a motion vector is determined using the field-subsampled image signal.

Disk media, and method of and device for recording and playing back

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Nagaokakyo, Japan

Tadashi Kasezawa