IMAGE SIGNAL PROCESSOR

摘要

The power values at fixed frequencies of an input image signal of such as a character, a photograph or a screen halftone show special characteristics depending on each kind of input image signals. In the present invention, there are provided proper image processors for individual kinds of input signals, power detectors for detecting the power at fixed frequencies in the direction of the main scanning and/or subscanning, an image signal identification section which outputs a kind-identification signal of an input image signal based on the detected power, and a selection section for selecting the output of a proper image processor for an input image signal.