Ricoh Company, Ltd.

Ricoh Research Institute of General Electronics

Yutaka Sano

Keiichi Suzuki

Takanori Yano

Yukio Kadowaki

Tooru Suino

Minoru Fukuda

Shogo Oneda

Hiroyuki Sakuyama

Taku Kodama

Masafumi Kumano

Koichi Haga

Akio Matsubara

Akihiro Fuse

Yasuyuki Shindoh

An image decoder comprises a code decompression/decoding unit that decodes code data produced through compression and encoding of image data, a power supply state detection unit that detects a current state of a power supply of the image decoder, and a controller that controls the code decompression/decoding unit based on the current state of the power supply so as to reduce power consumption in performing decompression and decoding of the code data.

Image coder and image decoder capable of power-saving control in image compression and decompression

In an image processing apparatus, first code data including multiple sets of code data in which image data of multiple static images are compressed and encoded, are synthesized. The first code data are converted into second code data that are compressed and encoded to be a single code data sequence where a motion image aligns the static images in chronological order as consecutive frames. In addition, the second code data may be converted into the first code data.

Image processing apparatus and method for converting first code data sets into second code data for JPEG 2000 and motion JPEG 2000

In an image processing apparatus, using distortion amount information showing how much a decoded image is degraded from an original image when data are eliminated from the data sequence is read from a code sequence in which the original image is compressed and encoded, an occurrence of an error in each unit of the code sequence is detected. A distortion amount of the decoded image against the original image is calculated when the code sequence is decoded after the data are eliminated from the code sequence by using the distortion amount information concerning the data in which the error is detected. Then, the decoding of the code sequence is cancelled based on a calculation result.

Image processing apparatus for using distortion amount information

An image sending apparatus is provided, in which the image sending apparatus comprises an analyzing syntax of code sequence data, a generation unit generating another code sequence data from the code sequence data by using the analysis result, a unit to measure the load of the generation unit; a unit to generate a parameter corresponding to the load, wherein the generation unit generates the another code sequence data by using the parameter such that the data amount of the another code sequence data to be sent is adjusted according to the load.

Image sending apparatus and image receiving apparatus for sending and receiving code sequence data

An image processing apparatus includes an image compression device which performs a discrete wavelet transform of pixel values for each rectangular portion to produce wavelet coefficients, and performs a hierarchical compression coding of the wavelet coefficients for each rectangular portion so that a codestream is produced. A codestream transform device is provided to reduce an amount of code data in the codestream. The codestream transform device comprises a syntax analysis unit which analyzes header information of each rectangular portion in the codestream. A comparison unit determines a similarity of pixel values between a current frame and a preceding frame in the codestream based on a result of the analysis. A codestream generating unit deletes code data of a corresponding rectangular portion of the current frame when the similarity is larger than a given threshold value.

Image processing apparatus, image recording apparatus, image reproducing apparatus, camera system, computer program, and storage medium

An image compression apparatus includes a tile size determiner, an image divider and an image compression processor. The tile size determiner determines an arbitrary size of a rectangular tile for each component of a still image having a plurality of components. The image divider divides the image using the rectangular tiles the sizes of which are determined by the tile size determiner. The image compression processor performs an irreversible compression process on the image divided by said image divider.

Image compression with tile alignment

An image compression apparatus includes a tile specifying section specifying rectangular tiles having an arbitrary size with respect to an image, an image dividing section dividing the image using the specified rectangular tiles, a bit-plane decomposing section decomposing each of the specified tiles dividing the image into bit-planes, a bit-plane ordering section ordering the bit-planes decomposing each of the specified tiles depending on a coding sequence, a layer forming section forming layers by the ordered bit-planes, and a suppressing section suppressing a quantization rate of a region low relative to other regions of the image.

Image compression method and apparatus for suppressing quantization rate in particular region, image expansion method and apparatus therefor, and computer-readable storage medium storing program for the compression or expansion

In a still image decompression process, operations of respective parts of a still image decompression apparatus are controlled so as to limit the operations into those such that a decompressed image on a specific LL subband is obtained.

Image decompression apparatus and method

A MOS semiconductor device with control electrodes for improved switching accuracy and operational speeds of the device at reduced power consumption levels. The semiconductor device includes a substrate, a source electrode region and a drain electrode region formed in said substrate, a first gate insulating film formed on said substrate, a semiconductor region formed on said first gate insulating film, a second gate insulating film formed on said semiconductor region, a gate electrode region formed on said second gate insulating film, and at least one control electrode region disposed in contact with said semiconductor region.

Semiconductor device with control electrodes formed from semiconductor material

Semiconductor device with gate and control electrodes that provide

This invention relates to a photosensitive material for electrophotography having, on a substrate, an amorphous silicon layer comprising silicon atom as the matrix and containing at least one of hydrogen atom, halogen atom and heavy hydrogen atom, characterized by provided with a porous aluminum oxide layer between said substrate and said amorphous silicon layer. This invention further relates to a photosensitive material for electrophotography having, on a substrate, an amorphous silicon layer comprising silicon atom as the matrix and containing at least one of hydrogen atom, halogen atom and heavy hydrogen atom, characterized by provided with a porous aluminum oxide layer having the surface treated with a silicide material between said substrate and said amorphous silicon layer.

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Miyagi, Japan

Yutaka Sano