Kabushiki Kaisha Toshiba

Yuuzi Sano

Hideyuki Shimada

Noriaki Tanabiki

Kouei Kawamura

The object of the present invention is to provide a video compression coding apparatus which, in the case where a code quantity variation allows a greater margin, can compress video data while suppressing any degradation of a video quality. First, input video data, after being transformed by a DCT section to a DCT coefficient, is quantized, by a quantizing section, with a quantization level designated with quantization control data. This quantized data is input to a variable length coding section where it is compression-coded in a block unit corresponding to a field or frame. A code quantity detecting section detects a code quantity of this coded data and delivers a result of detection to a quantization control section. The quantization control section has a given coding quantity-quantization level control characteristic representing a relation, to the quantization level, of the code quantity which obtains an average code quantity of initially input video data. The quantization control section determines a quantization level of the next block on the basis of the control characteristic and code quantity information from the code quantity detecting section and generates corresponding quantization control data.

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Yokohama, Japan

Yuuzi Sano