| 摘要 |
An image reading apparatus reads every picture element of an original image, converts the as-obtained analog signals of the respective picture elements into image data which are multilevel digital signals, image-processes the converted image data, and outputs binary image data corresponding to the respective picture elements. The original image is divided into a plurality of picture element blocks which are repeated every one or plural basic units with a basic unit of one or plural picture elements being continuous in a main scanning direction. The image data of the divisional picture element blocks are subjected to image processing such as trimming, masking, simple binarization processing and pseudo half tone processing in a parallel manner. Thereafter the image data of the picture element blocks are combined with each other so that image data corresponding to the original image are outputted.
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