Canon Kabushiki Kaisha

Other

Naohisa Suzuki

Jiro Tateyama

Koji Fukunaga

Atsushi Nakamura

Makoto Kobayashi

Kiyoshi Katano

Tsutomu Takahashi

Jun Oida

Shigeru Mizoguchi

Masaki Nishiyama

Hisatsugu Naito

Hiroharu Nakajima

Kazuhisa Kawakami

Michihisa Kumamoto

Yuji Akiyama

Takashi Fujita

Makoto Torigoe

Ryosuke Iguchi

Manabu Yamazoe

Junichi Yoshikawa

Susumu Takase

This invention has as its object to detect an image area of interest in an image file by a method with a lighter processing load by making determination using characteristics of a quantization table. Since spatial frequency information, chromaticity information, and a quantization table are acquired for respective predetermined blocks from inputted compressed image data, and are used in combination upon searching the compression-recorded image data for an image of interest, information containing AC component information for each image data block is acquired without any advanced calculations, thus searching for the image of interest in the image file.

Image area extraction method, image reconstruction method using the extraction result and apparatus thereof

A data transmission system where an image providing device and a printer are directly connected by a 1394 serial bus, a command is sent from the image providing device to the printer, then a response to the command is returned from the printer to the image providing device. Image data is sent from the image providing device to the printer based on information included in the response. The printer converts the image data outputted from the image providing device into print data. Thus, printing can be performed without a host computer by directly connecting the image providing device and the printer by the 1394 serial bus or the like.

Data transmission apparatus, system and method, and image processing apparatus

In response to a request from a host device using an initial protocol, capability information including information indicative of a plurality of communication protocols is returned to the host device, and a communication protocol, designated by the host device based on the capability information, is set, and print data is received from the host device by the set communication protocol. In a system using an interface connected to various types of devices, e.g., an IEEE 1394 serial bus, a communication protocol, which is used when a host device transfers print data to a printer, is not limited to that unique to the manufacturer of the device.

Data communication apparatus and method of a device that supports plural communication methods

An image area of interest in an image file can be detected by a method with a relatively light processing load by making a determination using characteristics of a quantization table. Since spatial frequency information, chromaticity information, and a quantization table are acquired for respective predetermined blocks from inputted compressed image data, and are used in combination upon searching the compression-recorded image data for an image of interest, information containing AC component information for each image data block is acquired without any advanced calculations, thus searching for the image of interest in the image file.

In outputting of image data, the image data is converted into color space data suitable for outputting means, and thereby a color reproducing capability of the outputting means is utilized. Thus, the image data is read, the image data is converted into first color space data, the image data is converted into second color space data, the first color space data is outputted to first outputting means, and the second color space data is outputted to second outputting means.

Method and apparatus for processing image data, storage medium and program

In a system where a digital still camerais connected to a printeron a 1394 serial bus, when the digital still cameraas a data transfer originator node transfers image data to the printeras a data transfer destination node, the printersends information on the data processing capability of the printerto the digital still cameraprior to data transfer. The digital still cameradetermines the block size of image data to be transferred in accordance with the data processing capability of the printer, and sends image data of the block size to the printer. The information indicates the capacity of a memory of the printer for storing print data, or the printing capability of a printer engine, i.e., printing resolution, printing speed and the like. Thus, data transfer is always efficiently performed regardless of the data processing capability of the printer

If a block read cannot be used to read out from a configuration ROM information, the number of times of issue of a quadlet read request increases. This degrades the processing efficiently of a device that issues the request. In addition, the bus occupation ratio of a 1394 serial bus by the request becomes high, and the speed of processing through the 1394 serial bus decreases. To solve these problems, information stored in the configuration ROM area of a device is read out, and it is determined on the basis of the readout information that configuration information identical to the configuration ROM information is stored in an address area (block readable area) different from the configuration ROM area, the offset is changed, and the configuration information is read out from the address area different from the configuration ROM area.

Information processing apparatus and method therefor

Data communication on a serial bus using a selected protocol based on an obtained device identifier

In a 1394 network where a number of devices are connected, it is not easy to specify corresponding between a displayed device and a real device. Accordingly, &ldquo;selection-candidate update processing&rdquo; to find a new device and &ldquo;processing for displaying candidates meeting set conditions&rdquo; to display candidates which meet set conditions are provided, so as to display a device list window displaying selection candidates in a case where a set condition is, e.g., &ldquo;printer&rdquo;.

Information processing apparatus and method

In a 1394 network where a number of devices are connected, it is not easy to specify corresponding between a displayed device and a real device. Accordingly, &ldquo;selection-candidate update processing, to find a new device and &ldquo;processing for displaying candidates meeting set conditions&rdquo; to display candidates which meet set conditions are provided, so as to display a device list window displaying selection candidates in a case where a set condition is, e.g., &ldquo;printer&rdquo;.

Data communication on a serial bus using an initial protocol which being executed in a transaction layer

An image reading method and device are capable of producing a sufficient amount of light to read an original image by means of a simplified circuit construction, and are also capable of providing more stable high-quality image information with less power consumption. The image reading device includes a reduced optical system which is arranged to bring reflected light obtained by illuminating an original with an LED into focus on a CCD sensor through a lens and read an image formed on the CCD, and also includes a custom IC for performing preheating control and warmth retention control of the LED.

Image reading device and image reading method

A host computer logs in an image providing device such as a scanner connected by a serial bus, and reverses flow control of data transfer by issuing a Reverse command. The image providing device opens a transfer channel by an OpenChannel command, transfers image data in form of blocks. When the transfer of the image data has been completed, the image providing device closes the transfer channel by a CloseChannel command, and reverses the flow control of the data transfer again by the Reverse command. This changes the data transfer direction of a device having a bi-directional data transfer function, i.e., a device having a data reception function and a data providing function.

System for reverse data transmission flow control wherein command is transferred by asynchronous transfer mode while data is transferred by isochronous transfer mode

Growing community of inventors

Yokohama, Japan

Naohisa Suzuki