| 摘要 |
A picture image discriminating apparatus operating for picture image discrimination processing by scanning a document, converting a light signal corresponding to every unit reading sizes 0.01 mm2 or over of the document photoelectrically and transmitting it to a signal processing division that a density signal of the picture image of document. The document is divided into a plurality of blocks, and the density signal of the picture image of document is processed at every blocks, thereby discriminating picture images. The density signal of the picture image of document is processed to obtain an effective density histogram, and a cumulative value of the density signals over or below a specific density threshold is obtained in the histogram, thereby discriminating picture images.
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