Image processing apparatus and method for allowing the dynamic r

Details Image processing apparatus and method for allowing the dynamic r Image processing apparatus and method for allowing the dynamic r

1992-08-28

1994-05-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358465, 358503, H04N 146, H04N 140, G03F 308

Patent

active

053174275

ABSTRACT:
An image processing apparatus and method is provided which makes it possible to reproduce all information of digital image data having a wide dynamic range. A high frequency component of luminance image data is removed by a digital filter. The luminance image data whose high frequency component is removed is divided into highlight image data and shadow image data. Level conversion processing is performed so that the luminance level of the blackest point of the highlight image and the luminance level of the whitest point of the shadow image coincide with each other. Luminance image data is generated by synthesizing the highlight image data, the shadow image data, and the high frequency component. A thermal head is driven on the basis of the luminance image data generated and chrominance image data, to print an image.

REFERENCES:
patent: 4812903 (1989-03-01), Wagensonner et al.
patent: 5170443 (1992-12-01), Todd

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