Ricoh Company, Ltd.

Masatake Ohmori

Kazumasa Koike

Toshiaki Nomura

Hirokazu Goto

Mitsuo Shinya

Yasuyuki Fukunaga

A motor drive device drives a stepping motor having a rotor mounted on a rotating shaft with a capability of making a transition between a plurality of excitation modes. A motor control unit drives the stepping motor by controlling the rotor to move to a position corresponding to an excitation modes. A stop control unit controls, when stopping the stepping motor, a stop of the rotor at a position to which the rotor is moved by the motor control unit common to the excitation modes after the stop of the rotor is issued.

Motor drive device, image reading device, image forming apparatus, and motor drive method

In an image forming device, an identification data input unit receives a first user-identification data which identifies a user of the image forming device and is inputted by the user. A data comparison unit detects whether the first user-identification data matches with a second user-identification data received from a host terminal before or after an image output request is received or concurrently with receipt of the image output request. A management information transmitting unit transmits an image output enabled state notice to the host terminal in response to the image output request when the first user-identification data matches with the second user-identification data. An image output unit receives image data transmitted by the host terminal in response to the image output enabled state notice, and outputs an image based on the received image data.

Image forming device and host terminal connected to the image forming device

A color printing apparatus includes an image memory that stores input image data, an image data region extracting device that extracts an image data existing region in the image memory, a pattern data superposing device that superposes specified pattern data only on the image data stored in the image memory in accordance with a result of extraction performed by the image region extracting device, a data reordering device that reorders the image data in accordance with a printing manner, and a data launching device that launches data to an image formation system.

Color printing apparatus configured to superpose specified pattern on image

A method of reducing a size of a binary image, includes the steps of reducing the size of the binary image in a sub-scanning direction by using a conditional OR process and limiting a size-change point determined by a reduction rate to an odd-number line or an even-number line.

Image reduction method, image processing device and method of controlling image processing device

A color-image forming device is provided with: a color-image forming unit for forming a color image by superimposing a plurality of images corresponding to a plurality of colors onto a recording medium. An automatic color-drift correction executes color-drift correction of color drift generated during the superimposition of the images. A color-drift correction execution interval setting unit variably sets the color-drift correction execution intervals, at which intervals the automatic color-drift correction executes the color-drift correction. The functions of the automatic color-drift correction and the color-drift correction execution interval setting unit are realized by the system control unit.

Color-image forming device and method of controlling the same

A facsimile machine reads an image and stored the image data. The facsimile machine then receives information from the destination device on the image processing capabilities of the destination device. The facsimile machine performs color space conversion of the image data based on the image processing capabilities of the destination device before establishing a connection with the destination device, establishes a connection with the destination device and transmits the color space converted the image data to the destination device.

Communication apparatus and image communication method

A coding apparatus includes an arithmetic coding medium as a specified information setting medium and an information processing apparatus provided with the above coding apparatus. The coding apparatus can obtain a high confidentiality and practice an arithmetic coding method without losing high-speed performance in order to realize the method. The coding apparatus provided with the arithmetic coding medium includes a state memory for storing a reference address for addressing a probability table into respective addresses addressed by data extracted by a model template and a probability table previously storing different appearance probabilities in the respective addresses. The specified information is previously written in a specified information memory. When the coding operation is started, an initializing medium reads out the specified information from the specified information memory, obtains the initial address frown the specified information, and sets the initial address to the state memory as the initial address of the reference address.

Coding apparatus and an information processing apparatus provided with the coding apparatus

An image scanning apparatus efficiently compresses and encodes image data obtained by scanning both sides of an original sheet by using a line memory storing three lines. Image data output from a first scanner and image data output from a second scanner are alternately output from a switching unit on an individual line basis. The line memory stores three consecutive lines of the image data output from the switching unit. The three lines include a current line, an immediately preceding line and a second immediately preceding line immediately preceding the immediately preceding line, the current line including a current pixel being encoded. Reference pixels are extracted from among pixels included in the current line and the second immediately preceding line. A pixel value of the current pixel is encoded by using a predicted pixel value of the current pixel as a parameter so as to output encoded image data corresponding to both sides of the original sheet. The prediction of the pixel value is performed by referring to the reference pixels.

Image scanning apparatus for scanning both sides of an original sheet

A device encodes a multi-level image by coding bit planes obtained from the multi-level image. The device includes a gray-code-conversion unit converting the multi-level image into a gray-code representation, a bit-plane generating unit generating the bit planes from the gray-code representation, a data-reference unit extracting a current pixel and fixed reference pixels from a first one of the bit planes and extracting a floating reference pixel from a second one of the bit planes including the first one, and a coding unit coding a sequence of pixels extracted sequentially from the bit planes by using an entropy coding method. The entropy coding method uses as a coding parameter a probability of data occurrence of the current pixel, the probability of data occurrence being obtained based on the fixed reference pixels and the floating reference pixel.

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Kanagawa, Japan

Masatake Ohmori