Device for compressing still image data

Details Device for compressing still image data Device for compressing still image data

1996-07-12

1999-11-30

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3582613, 358426, 348405, 382232, H04N 1415, H04N 1417, H04N 712, G06K 936

Patent

active

059952377

ABSTRACT:
A device for compressing still image data has a discrete cosine transformer for discrete-cosine-transforming video data output in block units from a frame buffer in a digital camcorder, a quantizer for quantizing the video data transformed in the discrete cosine transformer, a variable-length coder for variable-length-coding the video data quantized in the quantizer, and a quantization interval determiner for producing a quantizer number for controlling a quantization interval, and outputting the quantizer number to the quantizer. The device further has a comparator for comparing the bit number of video data variable-length-coded at quantization intervals for the first frame with a reference bit number for the best image quality, and outputting a flag signal on the basis of the comparison, and a flag buffer for temporally storing the flag signal output from the comparator, so that the quantization interval is determined according to the result of the comparison output from the flag buffer to make the bit number of the video data of the frames following the first frame approximately equal to the predetermined reference bit number for the best image quality. Since the bit number of variable-length-coded data of the first frame is compared with its reference bit number, and a quantizer number for the following frame is determined on the basis of the comparison, the bit number of the second frame data is approximately equal to its reference bit number resulting in high quality still image.

REFERENCES:
patent: 5404168 (1995-04-01), Yamada et al.
patent: 5530478 (1996-06-01), Sasaki et al.
patent: 5686964 (1997-11-01), Tabatabai et al.

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