Ricoh Company, Ltd.

Yukio Kadowaki

Tooru Suino

Keiichi Suzuki

Takanori Yano

Minoru Fukuda

Shogo Oneda

Yutaka Sano

Takayuki Nishimura

Yutaka Sato

Takahiro Yagishita

Yasushi Abe

Akemi Nagatani

Kazuhiro Miyazaki

Hiroyuki Sakuyama

Masanori Itoh

Mitsutaka Iwasaki

Shogo Nakamura

Masahiro Shindo

Masanobu Fukushima

Toshikazu Yoshimizu

Shigeki Matsuoka

Shunpei Tamaki

Toshio Kawakami

Shoji Matsumoto

Kenichi Kurihara

A compact serial communication device is disclosed that is formed from simplified circuits on a master side and a slave side and does not need a synchronous signal and a switching unit for switching transmission and reception operations, and is able to reduce load of the slave side. The master transmission/reception circuit outputs a serial data signal DATA to a transmission path with the serial data signal DATA being generated by superposing a low level superposition pulse on a clock signal, when the clock signal is at the high level, according to an output data signal to be output to the slave transmission/reception circuits; the slave transmission/reception circuits superposes a high level superposition pulse on the serial data signal DATA input from the transmission path according to an output data signal to be output to the master transmission/reception circuit when the clock signal is at the low level.

Serial communication device, method thereof and communication system using the same

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

An image processing apparatus includes a coding part that performs coding on image data based on the result of decomposing the image data into bit planes block by block, and a quantization part that reduces the values of the image data of a predetermined block to be compressed at an increased rate. The quantization part is provided at an earlier stage than the coding part.

Image processing apparatus and method capable of finely adjusting data compression rate

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

A method of processing image information in which the image information is encoded by the bit plane and compressed by truncating one or more of the bit planes. Since the index parameter indexing the effect of the truncation on the quality of the image information is generated before the truncation, one can determine the bit planes to be truncated based on the index parameter without decoding the image information.

Method of processing image and audio information, image and audio processing apparatus and computer program that causes a computer to process image and audio information

An image processing apparatus divides data related to an image into bit-planes and performs a coding process on data of each of the bit-planes. The image processing apparatus includes a multi-layer generation part that divides codes obtained by the coding process into a plurality of layers sequentially from the codes corresponding to higher bit-planes such that the amount of the codes of each of the layers is equal to or less than a predetermined value. A code generation part generates coded data in units of the codes divided into the layers by the multi-layer generation part.

Image processing apparatus that can generate coded data applicable to progressive reproduction

An image processing method generates TAG information based on inclusion information which indicates an existence of significant data in code blocks for each of sub-bands, according to JPEG2000 standard. The image processing method accepts the inclusion information of the code blocks in a predetermined sequence in units of code blocks amounting to a number which is smaller than a number of code blocks of sub-bands in all levels, and immediately generates and outputs TAG information corresponding to the accepted inclusion information.

Image processing method and apparatus

An image processing apparatus includes a wavelet transform unit that performs compression encoding in a hierarchical manner by performing discrete wavelet transform on pixel values for each of one or more rectangular regions dividing image data. A digital watermark obtaining unit obtains digital watermark data to be embedded into wavelet coefficients generated by the wavelet transform unit. A characteristics extracting unit extracts characteristics of the wavelet coefficients for each of the rectangular regions. An embedding specification determination unit determines an embedding specification of the digital watermark data with respect to the wavelet coefficients in accordance with the characteristics of the wavelet coefficients for each of the rectangular regions that are extracted by the characteristics extracting unit. A digital watermark embedding unit embeds into the wavelet coefficients the digital watermark data for each of the rectangular regions in accordance with the embedding specification of each of the rectangular regions.

Image processing apparatus, program, and storage medium that can selectively vary embedding specification of digital watermark data

An image processing apparatus is provided with an image expansion unit to expand an image compressed code and to output an expanded image data, the image compressed code is obtained by compressing a master image data, and a picture quality judging unit to judge a relative picture quality of the expanded image data with respect to a picture quality of the master image data, based on the image compressed code, and to generate picture quality information indicating the relative picture quality.

Image processing method and apparatus, and computer-readable storage medium

An image compression device is disclosed that is capable of quickly compressing image data to a target value by a simple configuration while maintaining quality of a reproduced image as much as possible. The image compression device includes an encoding part, a code reduction part, and a processing part. The encoding part performs a frequency analysis for original image data, encodes the coefficients generated by the frequency analysis first unit by first unit, and generates a series of codes. The code reduction part reduces the amount of the codes of each of the first units. The processing part divides the coefficients or the codes of each of the first units into second units, and increases the amount of codes to be reduced in the code reduction part for each of the second units according to values of the coefficients or the codes of each of the second units.

Image compression device and method

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 apparatus for compressing an image, comprising: a coding unit configured to generate code data by encoding data derived from image data; a memory unit which stores truncation data items identified by respective data sequence numbers, wherein a truncation data item specifies a way in which code data is removed from the generated code data, such that the larger the data sequence number, the higher a quality of a reproduced image obtained by decoding the generated code data after the removal of code data, or such that the larger the data sequence number, the lower the quality of the reproduced image; and a rate control unit configured to identify a data sequence number of a truncation data item that provides a code data parameter substantially equal to a desired value, said code data parameter being responsive to an amount of code data removal.

Image compressing apparatus that achieves desired code amount

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

A serial communication system is provided which performs serial communication between host and slave apparatus using half-duplex channel communication with a serial data signal generated by superimposing a data signal on a clock signal. The host apparatus transmits through a transmission path an identification signal generated by superimposing on the clock signal identification data for specifying a slave apparatus to be requested, after transmitting through the transmission path a preamble signal generated by superimposing successively repeated data on the clock signal.

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Nara, Japan

Yukio Kadowaki