Mitsubishi Denki Kabushiki Kaisha

Junko Kijima

Kazuhiro Sugiyama

Yoshiko Hatano

Takashi Nakao

Mamoru Inamura

Noriyuki Yamaguchi

Masaharu Yao

Mitsuru Ishizuka

Takuji Kurashita

Tomoaki Ikeda

Junji Sukeno

Hitoshi Hasegawa

Kazuhioro Sugiyama

An encoding system capable of preventing the overflow of a buffer and performing the encoding of a VOP within a predetermined time period even where the processing time period necessary for encoding each macroblock is not constant. In order to provide the encoding system, the maximum number of bits Tmax is set for each VOP, and the output of encoding unit and the output of fixed code output unit is switched and outputted so that the number of bits Sc of the VOP may not exceed the Tmax.

Encoding system and encoding method

To provide a coding device which does not generate a video packet having only a stuffing but can insert a minimum stuffing to prevent an underflow of a buffer in the case in which a video packet has a length limit. A minimum code volume (Tmin) is set for each VOP and a break of a video packet and an insertion of a stuffing are determined such that a code volume (Sc) of the VOP is not smaller than the minimum code volume (Tmin).

Coding device and coding method

An image encoding device is provided that can transmit encoded image data without lowering the frame rate even when the transmission speed of the transmission path is lowered. An encoded region designator selects the region that is to be encoded, in the input image, depending on the bit rate of the transmission path. Only such a region that is designated by the encoded region designator is encoded. The encoded region designator may be one which selects the region that is to be encoded, according to the bit rate of the transmission path, and the motion vector detected by the image encoding circuit. As an alternative, an encoded region designator may be used which selects the region that is to be encoded according to the bit rate of the transmission path, and the information on the designated region supplied from the outside. Also, a selector limiting the number of bits of the signal from the image signal input circuit may be provided, and when the bit rate of the transmission path is lowered, the number of bits of the input image may be adaptively switched.

Image compression of selected regions based on transmission bit rate, motion, and/or region information, and bit selection before compression based on transmission bit rate

The imaging device according to the present invention adjusts the luminance in the first image such that the addition value of the value, which is obtained by multiplying the feature quantity of the luminance in the central portion of the first image by the first coefficient, and the feature quantity of the luminance in the peripheral portion of the first image becomes the first target value, and also adjusts the luminance in the second image such that the addition value of the value, which is obtained by multiplying the feature quantity of the luminance in the central portion of the second image by the second coefficient that is set independently of the first coefficient, and the feature quantity of the luminance in the peripheral portion of the second image becomes the second target value.

Imaging device

As the video signals of macroblocks are coded, they are stored in a buffer. When the total code length of the stored macroblocks exceeds a predetermined value, all but the most recently coded macroblock are output from the buffer as a video packet, and the most recently coded macroblock is coded again. To minimize this occurrence, when each coded macroblock is stored, the code length of the next macroblock is predicted and added to the total length, and if the resulting sum exceeds the predetermined value, all of the coded macroblocks stored in the buffer are output as a video packet.

Video coding method and apparatus that predicts macroblock code length

Motion-adaptive chrominance-luminance separation of a composite video signal is accomplished by comb-filtering the video signal on the time axis, bandpass-filtering the video signal on at least one spatial axis selected according to spatial correlation detected in the video signal, and combining the two filtered results in proportion to motion detected in the video signal. Motion is detected in part by obtaining a one-frame difference signal that has been filtered to eliminate chrominance information; here too the filtering is performed on at least one spatial axis selected according to spatial correlation. Selecting the spatial filtering axes according to spatial correlation enables chrominance and luminance to be separated effectively without unnecessary information loss.

Chrominance-luminance separation method and filter performing selective

A filter for motion adaptive Y/C separation, which is capable of obtaining image of high resolution and little picture quality degradation in the case where an image is switched from static one to motion one or vice-versa, is provided with a filter for extracting Y signal outputting Y signal and a filter for extracting C signal outputting C signal, by detecting whether image is motion one or static one by a motion detecting unit, and when motion image is detected, by detecting partially interframe correlation or correlation in three fields, and according to the detection result, by adaptively switching a plurality of processings for extracting intraframe Y signal and a plurality of processings for extracting intraframe C signal.

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Tokyo, Japan

Junko Kijima