Image forming apparatus

Details Image forming apparatus Image forming apparatus

1992-05-15

1994-10-18

Ro, Bentsu

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358501, 358518, H04N 140

Patent

active

053573536

ABSTRACT:
The characteristics such as hue, saturation, edge portion or flat portion of image data are decided for each pixel based on read data of three primary colors. The decision is performed on the data which have been subjected to spatial filtering, and the processing of the image data such as smoothing or edge emphasis are changed according to the detected characteristics. For example, the masking coefficient is selected according to the detected hue. The color data is decreased and the black data is generated, according to the detected saturation. The edge is decided only when the sign of the gradients of the three color data agree with each other. Further, edge detection quantity is detected in the edge decision and the edge emphasis or the smoothing is performed by comparing the edge detection quantity with threshold values only when the edge is detected.

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