| 摘要 |
Apparatus and method for discriminating between regions of text and continuous tone regions of mixed format documents and for selecting print/no-print decisions to be made by either an image processing algorithm optimized for text or an image processing algorithm optimized for continuous tone. A video signal of digital values indicative of pixels representing the image content of the document is generated. The video signal is applied to a two-level threshold discrimination network, to a processor having the text algorithm, and to a processor having the continuous tone algorithm. The continuous tone image processing algorithm is selected (1) when the video signal is above the lower discrimination threshold and the decision of the text algorithm is to print and (2) when the video signal value is below the upper discrimination threshold and the decision of the text algorithm is to not print. The text image processing algorithm is selected under any other condition.
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