Two-pass image processing method and apparatus using virtual est

Details Two-pass image processing method and apparatus using virtual est Two-pass image processing method and apparatus using virtual est

1997-02-21

1999-08-10

Au, Amelia

Image analysis

Image compression or coding

Quantization

382239, 3582612, 358430, 348405, G06K 936, G06K 938, G06K 946

Patent

active

059371005

ABSTRACT:
An image processing method and an image processing apparatus in which a DCT section transforms image data to a frequency conversion coefficient using a discrete cosine transform coefficient, a quantizing section quantizes the transformed frequency conversion coefficient using a quantization coefficient indicating weighing in quantization, a Huffman encoding section encodes the quantized data, and a CPU detects a code rate for encoded data by a prespecified time interval during execution of processing for encoding the data quantized by the encoding means and changes the quantization coefficient during processing for encoding according to the detected code rate.

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patent: 5621820 (1997-04-01), Rynderman et al.
patent: 5757434 (1998-05-01), Gunnewiek et al.
patent: 5781237 (1998-07-01), Fukuda

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