Canon Kabushiki Kaisha

Akira Kuronuma

Takayuki Murata

Shinichi Omo

Toru Nakayama

Masahiko Umezawa

Hiroshi Fukui

Masafumi Wataya

Souhei Tanaka

Takuji Katsu

Noriyuki Suzuki

Masashi Matsumoto

Sohei Tanaka

Kenji Kubozono

Shinsuke Ikegami

Tetsushi Kono

Hidehiko Kanda

Yuji Akiyama

Yasutomo Watanabe

Akinori Horiuchi

Takeaki Nakano

Shinichiro Takahama

Akira Nagatomo

Chikatoshi Okubo

Judgment image data having a resolution in a direction in which a printing medium is conveyed which is lower than a printing resolution is generated based on input image data. It is determined whether color unevenness is generated in a printed image by comparing the judgment image data with reading data obtained by reading the printed image.

Image processing apparatus, image processing method, and medium storing program

A judgment reference data having a resolution lower than a nozzle resolution in a nozzle arranging direction is generated based on input image data. The judgment reference data and read data acquired by reading a printed image are compared to judge whether the printed image has color unevenness or not.

Image processing apparatus, image processing method and medium

A recording apparatus configured to record on a recording medium by using a recording head, includes a first storage unit that stores input data including a command and a first image data, a reading unit that reads out the command and the first image data stored in the first storage unit by using a first pointer, a generating unit that converts the first image data read out from the first storage unit and generate a second image data, a second storage unit that stores the second image data generated in the generating unit, a determining unit that determines whether an amount of data stored in the first storage unit reaches a predetermined value by using a second pointer, and a recording unit that starts a scan for recording after the determining unit determines that the amount of data stored in the first storage unit reaches the predetermined value.

Recording apparatus and method of controlling the recording apparatus based on image data commands

A recording apparatus has a buffer for dividing a storage area into a plurality of areas in a scanning direction of a recording head to record data by allowing a carriage loaded with the recording head to scan data on a record medium, and storing the divided image data in a divided area unit, and includes: a write control unit for controlling write address information about image data in the area unit for data of each color for storage of the image data divided in an area unit in the buffer; a read control unit for controlling for data of each color read address information for a read of image data stored in the buffer; and a record data generation unit for generating record data in a unit of the divided area based on the read image data according to the read address information.

Recording apparatus and method for controlling recording apparatus

Recording apparatus and method of controlling the recording apparatus

A CPU monitors the state of a printing apparatus, and controls transmission, to the host, of a control signal for controlling the data reception timing from the host.

Printing apparatus, control method therefor, and program

Disclosed is a printing apparatus in which printing elements used in the printing of each raster can be set at will. The printing apparatus has a carriage equipped with a printhead having a plurality of printing elements arranged in a predetermined direction, and the carriage is made to scan across a printing medium in a direction that intersects the direction in which the printing elements are arranged, thereby performing printing on the medium. The printing elements are divided into a plurality of blocks each consisting of a predetermined number of successive printing elements, print data that has been transmitted in raster form is stored in a receive buffer, and data that has been stored in the receive buffer is divided and stored in a print buffer having a plurality of areas corresponding to the blocks of printing elements. In accordance with printing elements used in a scan, the data in a corresponding area of the print buffer is shifted and the areas of the print buffer and respective ones of the blocks are made to correspond in accordance with distance over which the printing medium is transported after a scan is performed. The amount of shift is then calculated.

Printing apparatus and method

A recording apparatus for recording with use of a recording head having two nozzle arrays arranged side-by-side includes first, second, and third direct memory access (DMA) units, a data converter unit for converting first image data stored in a work buffer into second image data, a record buffer unit for storing the second image data, a latch unit for storing the second image data in a transfer buffer, a buffer reading control table unit, and a DMA control unit for causing transfer processing to be executed by the first, second, and third DMA units based on a flag in the buffer reading control table unit when the image data stored in the work buffer is transferred to the transfer buffer.

Ink jet recording apparatus and control method therefor

To reduce the data processing load on a recording apparatus, an information processing apparatus and the recording apparatus cooperate to correct registration errors. The information processing apparatus divides a recording area of the recording apparatus into a plurality of partial areas and makes a first correction on a recording position of image data for each partial area; the correction is made for color data items and in pixels. The information processing apparatus generates image data that conforms to the corrected recording position, as well as setting information for controlling the recording apparatus to record the image data. The recording apparatus makes a second correction on the recording position of the image data in fractions of a pixel based on the setting information generated by the information processing apparatus and controls recording of the image data based on the corrected recording position.

Image formation system, recording apparatus, and recording control method

A recording apparatus and a signal control method for the recording apparatus capable of high speed data reception suitable for each host apparatus and an improved throughput. The recording apparatus is provided with an interface control block and a CPU, the former transmitting an ACKX signal representative of a completion of data reception from a host apparatus to the host apparatus, and the latter controlling not to output the ACKX signal if it is judged that the ACKX signal is unnecessary, and to output the ACKX signal with an optimum width if it is judged that the ACKX signal is necessary.

Printing apparatus and method capable of flexibly controlling response signal

A DMA controller arbitrates and selects a DMA control information signal received from at least one of a plurality of DMA request blocks and accesses an SDRAM on the basis of the selected DMA control information signal. In the DMA controller, an SDRAM controller detects using a detector the number of possible sequential accesses on the basis of a DMA start address signal, compares using a comparator this number of possible sequential accesses with the burst DMA request number designated by a BSTNUM signal, selects not larger one of the two numbers, and sets the number of sequential DMAs to be actually executed to the selected number. Accordingly, with a simple configuration, sequential access is made possible starting from an arbitrary address.

Circuit for controlling sequential access to SDRAM

This invention provides a low-cost, economical printing apparatus and printing system. For example, characteristic information of a printhead which is described, printed, adhered, or formed on a printhead or its accessory (e.g., a packaging paper box) in a format identifiable to human or an electronic device is man-machine-interactively inputted to a host or electronically inputted to the host by a barcode reader or the like. The printing apparatus discriminates whether or not a command sent from the host via an interface is a command that includes characteristic information of the printhead, and control is made to write the characteristic information of the print head into a non-volatile memory (EEPROM) in accordance with the discriminating result. The printhead is controlled in accordance with the characteristic information written into the non-volatile memory to execute a print process.

Printing apparatus and printing system

A motor control apparatus has a motor driver for driving a motor in accordance with an input of digital-format drive data of a predetermined length, thereby driving a mechanism using the motor as a power source. The drive data, which has been made to correspond to a plurality of drive patterns, is stored in a memory, part of the drive data, which has been read out from the memory by DMA, is replaced with other data, and the resultant data is output to the motor driver. Thus, different drive data can be generated by replacing a part of the drive data stored in the memory with other data, and the generated data can be transferred to the motor driver. This makes it possible to reduce the memory capacity needed for motor control.

Motor control apparatus and method

There is provided an output control circuit provided in an integrated circuit that enables any arbitrary internal signal to be specified and output from any output terminal, and hence enable the monitoring of a large number of internal signals even if only a small number of output terminals are provided. A plurality of external output terminals output a plurality of signals existing in the integrated circuit. A plurality of signal output circuits are provided, to which the plurality of internal signals are mutually input. Each of the signal output circuits comprises a signal group select circuit that selects a predetermined signal group from the plurality of internal signals, a logic circuit that carries out logical operations on the selected signal group, and an external output circuit that outputs signals resulting from the logical operations via one of the external output terminals.

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Tokyo, Japan

Akira Kuronuma