Mitsubishi Denki Kabushiki Kaisha

Naito Manufacturing Co., Ltd.

Kenichi Asano

Kohtaro Asai

Tokumichi Murakami

Hiroaki Kikuchi

Hideo Ohira

Tadashi Kasezawa

Ryuta Suzuki

Masahiro Kazayama

Mitsuyoshi Suzuki

Toshiaki Shimada

Tsutomu Kubo

Shunichi Sekiguchi

Yoshihisa Yamada

Hirofumi Nishikawa

Atsushi Itoh

Naoto Kinjo

Masahiko Yoshimoto

Hidenori Sato

Masami Nishida

Okikazu Tanno

Yasunori Suzuki

Naofumi Goda

A moving picture encoding system includes an encoding control unit for setting a target quantiser step size used to encode each of different types of pictures included in a unit group to be encoded, and for performing a control operation to generate and furnish a quantiser step size to an encoding unit so that a ratio among the target quantiser step sizes set for the different types of pictures is a predetermined one. The encoding control unit initially sets the quantiser step size for a macroblock to be encoded first in the current picture currently being encoded to the target quantiser step size set for the picture type of that picture, and, each time the encoding unit encodes each of macroblocks remaining in the current picture, then updates the quantiser step size initially set for the first macroblock so that the average of the quantiser step sizes used during the encoding of all macroblocks in the current picture finally approaches the target quantiser step size set for the picture type of the current picture. Thus the system is able to control the amount of codes generated during the encoding of each of the plurality of pictures in the unit group while keeping the relative picture quality among the plurality of pictures adjacent with respect to time.

Moving picture encoding system

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

The present invention provides a motion compensating apparatus which is capable of enhancing the overall coding efficiency by taking the amount of coded information used to code a motion vector as well as the sum of difference absolute values of estimated differences into consideration in order to determine an optimal vector. The motion compensating apparatus includes: a motion compensation processing unit for outputting a motion vector between an input image and a reference image, and an estimated image which is extracted from the reference image in accordance with the motion vector; a unit for calculating the sum of difference absolute values, as a distortion amount calculating unit, to obtain a distortion amount between the input image and the estimated image; a vector value coding unit for receiving the motion vector to code the motion vector thus inputted thereto to output a vector coded amount; and an optimal vector determining unit for receiving the motion vector, the distortion amount and the vector coded amount to obtain, for all of a plurality of motion vectors to be evaluated, an evaluation function calculated from the distortion amount and the vector coded amount to output as an optimal vector the motion vector in which the evaluation function exhibits a minimum value.

Motion compensating apparatus, moving image coding apparatus and method

A digital data recording and reproducing system records only programs desired by a user. A program selector in a digital VTR or in a set-top box selects only the programs desired by the user from a plurality of programs received by a tuner in the set-top box. The programs include video, audio, data and so forth that are subjected to data compression in digital broadcasting. The program selector selects the programs in response to a user instruction sent from the user via a man-machine interface, and transfers the selected programs to a recorder. Besides, the digital data recording and reproducing system includes a decoder including a discontinuity detector for detecting discontinuity between the programs by using information specified by IEC/ISO 13818 while said decoder is decoding the compressed digital data of the programs. The discontinuity detector restarts the decoder when detecting the discontinuity between the programs.

Digital data recording and reproducing system capable of detecting discontinuity of data

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

Process for producing substrate for photosensitive drum and substrate for photosensitive drum

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

A method and apparatus of digital image decoding is provided for reducing compression-related deterioration of an image to a minimum with a reduced storage capacity. The digital image decoding apparatus is equipped with a compression rate judging section for judging an optimal rate of compression for effecting the least deterioration to the image based upon the size of image in connection with the storage capacity of a frame memory. A compressing section compresses decoded data based upon the optimal rate of compression and sends the compressed data to a predictive/display frame memory for storage. An expanding A section expands the compressed data based upon the optimal rate of compression and sends the expanded data to a decoding section when the expanded data is required. An expanding B section reads out the compressed data of a display frame from the predictive/display frame memory and expands the compressed data based upon the optimal rate of compression and sends the expanded data to a display unit for display.

Method and apparatus for digital image decoding

A motion vector detecting device re-arranges the pixel values which make up an initial block for color-difference signals, allowing for their superimposition, to produce a new color-difference signal block having the same number of pixels as that of a luminance signal block. The new color-difference signal block and a luminance signal block are respectively compared with a block for a reference image signal to perform block matching.

Device and method for detecting motion vectors

An image processor has a plurality of unit processors, each of which are assigned specific non-contiguous frame regions. All of the unit processors simultaneously start processing input partial image signals after all of the signals corresponding to the assigned frame regions have been fetched.

Multiprocessor system with unit processors assigned a plurality of

A multiprocessor type time varying image encoding system having a plurality of digital signal processor (DSP) modules (DMM's) connected in parallel, each DMM having a DSP, a local memory and an interrupt control unit, a plurality of common memories for storing data which is being processed, parameters, etc., an input frame memory which enables reading and writing operations to be executed asynchronously, a combination of a task control unit and a task table for distributing tasks to the DMM's, a plurality of independent common buses, and a combination of a bus control unit and a bus control table for bus sharing control.

Bus control for a plurality of digital signal processors connected to a

An information source encoding system in which overload noise and block noise are less recognized and quantizing overload and large quantizing distortion can reduced within an intra-frame mode encoding region even when intra-frame and inter-frame mode encoding regions coexist in an image screen. An orthogonal converter outputs conversion coefficients in a predetermined spatial frequency region. A coefficient separating unit selectively separates the conversion coefficients. With the separated coefficient from the coefficient separating unit, a power is calculated. The calculated power is compared with a predetermined threshold value by a coefficient power determining unit. A step width controller sets a quantizing step width, based on the combination of a power determining ON/OFF signal the coefficient power determining unit and an adaptive control ON/OFF signal from the encoding controller, when the coefficient power is larger than the threshold value in the intra-frame mode, and sets a quantizing step width determined by the quantization characteristic designation signal from the encoding controller in remaining cases. As a result, a combined adaptive quantization characteristic signal having a quantizing step width for combined adaptive control is output to the quantizer.

Information source encoding apparatus

Multiprocessor type time varying image encoding system and image

In an image coding and decoding device, input digital image signals are divided into blocks of prescribed size, and coding processing is performed on differential signals taken between the input block signal and interframe forcasting signals thereby enabling efficient transmission to be performed.

Image coding and decoding device

In a video encoding apparatus of the invention, a video camera is provided with a moving direction detecting means for detecting movement of the camera in preset moving direction and outputting a detecting signal, a movement information generator is installed for operating the displacement amount of the video camera based on the detecting signal outputted from the moving direction detecting means and calculating the specific position on the memory corresponding to the operated displacement amount of the video camera and outputting the position to a reference signal generator, and plural blocks stored to the specific position on the frame memory are read based on output from the movement information generator.

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Tokyo, Japan

Kenichi Asano