Ricoh Company, Ltd.

Shigeru Uekusa

Hayato Fujita

Muneaki Iwata

An image processing device includes: a first matching circuit to determine whether an image matrix of image data of a first resolution matches a first pattern, and output a first determination result; a first converting circuit to, if the image matrix matches the first pattern, replace a target pixel of the image matrix with a first pixel pattern of a second resolution, and output first image data of the second resolution; a second converting circuit to convert the image data of the first resolution into image data of the second resolution, and output second image data of the second resolution; a detecting circuit to detect whether the target pixel is included in a fine line structure, and output a detection result; and a selecting circuit to output one of the first image data and the second image data based on the first determination result and the detection result.

Image processing device implements image processing method to perform thinning and smoothing process on image data converted from first resolution to second resolution

A self-test circuit is driven by a multiphase clock signal which includes N number of clock signals in same cycle having phases from first to N-th phases each phase-shifted by 1/N of the cycle. The self-test circuit includes a data selecting circuit, a serialization circuit, and a logical test circuit. The data selecting circuit switches input data that are input as M-bit wide parallel data to the self-test circuit, between normal data and test data for logical test. The serialization circuit performs serial conversion of the input data in N-parallel manner and outputs bits in N-parallel manner, as a single serial output signal at timing corresponding to each phase. In synchronization with timing corresponding to each phase, the logical test circuit imports the serial output signal as N-parallel bit strings each having length equal to M/N number of bits and performs a bit logical test for M number of bits.

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Kanagawa, Japan

Shigeru Uekusa