Image data coding apparatus and method capable of controlling am

Details Image data coding apparatus and method capable of controlling am Image data coding apparatus and method capable of controlling am

1991-10-04

1994-03-01

Groody, James J.

Television

Bandwidth reduction system

342415, H04N 712

Patent

active

052912825

ABSTRACT:
An image data coding apparatus includes a preprocessing unit for executing preprocessing including compression for input image data in units of screens to generate a preprocessed output. A quantizing unit quantizes the preprocessed output with a predetermined quantization width to generate a quantized output. A variable-length coding unit executes variable-length coding for the quantized output. A target-amount-of-codes output unit outputs information concerning a target amount of codes corresponding to one screen. A quantization width predicting unit predicts a suitable quantization width on the basis of the information from the variable-length coding unit to supply information concerning the predicted quantization width to the quantizing unit. The quantizing unit quantizes the preprocessed output generated by the preprocessing unit with the predicted quantization width included in the information from the quantization width predicting unit.

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IEEE Transactions On Communications, vol. Com-25, No. 11, Nov. 1977, by Wen-Hsiung Chen and C. Harrison Smith; "Adaptive Coding of Monochrome and Color Images", pp. 1285-1292.

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