Band compression device for shaded image

Details Band compression device for shaded image Band compression device for shaded image

1981-03-10

1984-06-12

Gruber, Felix D.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, 382 56, H04N 713, H04N 100

Patent

active

044545460

ABSTRACT:
A band compression method for a shaded image in which a sample input picture element value and an estimation error obtained from an estimation value of the input picture element are converted into quantization values and coded. First codes are temporarily stored in at least one block of buffer memories according to a quantization step number. The estimation errors are converted into quantization values corresponding to the input picture element values. Each quantization value is converted into the first code when the estimation error is quantized corresponding to the estimation error and quantization value. The next picture element value is estimated in accordance with the quantization value.

REFERENCES:
patent: 4133006 (1979-01-01), Iinuma
patent: 4173771 (1979-11-01), Iijima
patent: 4200886 (1980-04-01), Musmann et al.
patent: 4222076 (1980-09-01), Knowlton
patent: 4288816 (1981-09-01), Kashioka et al.
patent: 4316222 (1982-02-01), Subramaniam
patent: 4355337 (1982-10-01), Sekigawa
patent: 4365273 (1982-12-01), Yamada et al.
Kobayashi et al.: Image Data Compression by Predictive Coding, IBM Journal Research and Development, Mar. 1974, pp. 164-171.

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