Image coding apparatus

Abstract

An image coding apparatus for generating two different types of coded data from a single piece of image data comprises a memory in which the input image data and the like are stored, a motion detector, a first encoder, and a second encoder. The second encoder performs quantization, variable-length coding, and control of generated code amount by settings different from those of the first encoder, on the basis of the output from a DCT, thereby generating second coded data that is different from first coded data generated by the first encoder. Therefore, it is possible to provide an image coding apparatus having no increase in circuit scale and processing time when generating plural pieces of coded data from a single input image.

Description

technical field [0001] The present invention relates to a digital signal recording and reproducing device such as a video tape recorder and a video disk recorder for digitally recording and reproducing video signals and audio signals, and an image coding device installed in broadcasting equipment for digitally distributing video signals and audio signals. An image encoding device that generates a plurality of encoded data from a single input image. Background technique [0002] In a digital signal recording and reproducing device for digitally recording and reproducing video signals and audio signals, or a broadcasting device for digitally distributing the above-mentioned video signals and audio signals, in order to miniaturize the device, it is necessary to reduce the digital signal processed in the device. The huge amount of information of the video signal is compressed (encoded). Therefore, in the method of compressing (encoding) the above-mentioned video signal, in addi...

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Problems solved by technology

In addition, since the generation of a plurality of coded data must be performed by only one motion detector and one encoder at a time, there is a problem that the processing time increases.

In addition, if one motion detector and one encoder are provided, the amount of data transfer from the memory to the motion detector and encoder increases in proportion to the encoded data generated by the image encoding device. Therefore, in order to increase If the transfer capability is insufficient, it is necessary to expand the width of the memory interface in the image coding device or to increase the data transfer rate. As a result, the system cost of the image coding device increases.

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