Sharp Kabushiki Kaisha Corporation

Yoshio Mizuyama

Motoyuki Itoyama

Naoyuki Kamei

Michiaki Nishimura

Sohichi Yoshimura

Takahiro Minami

Hiroki Kinoshita

A CPU includes a bus interface, a control unit, an instruction cache, a data cache, a secondary cache, an instruction decoder, an arithmetic unit, and registers. When operations can be performed only with the cache, the CPU inhibits access to external memory and stops power supply to the external memory. With this arrangement, by performing operations in the CPU without using the external memory, it is possible to realize a speedy processing and to stop power supply to the external memory, thus allowing for reduction in power consumption.

CPU, information processing device including the CPU, and controlling method of CPU

Corrected values C , M , and Y corrected in a quasi-grayscale processing section of an image forming device by an error diffusion technique performed for each channel are evaluated in threshold value sections provided for individual channels, so as to determine whether or not they are greater than threshold values. If an overlapping CMY dot formation detector section detects that the density is higher than the threshold value in all of the three channels, a minimum density channel identifying section instructs a first quantized value substitution section and varies the outputs from the threshold value sections, so that the output in the channel with the lowest density has a value that does not represent dot formation. As a result, overlapping dot formation for the three channels is interrupted. Consequently, an image processing device capable of restraining occurrence of dark blotches and decrease in saturation can be offered without losing dot balance between channels even when a quasi-grayscale process is executed for each channel.

Image processing device, image forming device incorporating the same, and storage medium for storing program used thereby

Image forming apparatus diagnosing print head and optical system conditions based on printed test pattern

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Nara, Japan

Yoshio Mizuyama