Canon Kabushiki Kaisha

Yukio Chiba

Katsumi Otsuka

Makoto Satoh

Tetsuya Tateno

Susumu Igarashi

Satoshi Naito

Makoto Sato

Mamoru Sato

Toshihiko Fukasawa

Disclosed is a moving image reproducing apparatus including a reproduction control unit. The moving image reproducing apparatus sequentially transfers at least part of moving image data elements stored in an incorporated memory to an external storage device, stating from a moving image data element to be reproduced last by the reproduction control unit.

Moving image reproducing apparatus and processing method therefor

A variable-length coding apparatus having a smaller circuit scale, which flexibly handles identifier insertion processing in correspondence with various coding schemes, and which performs fine code amount control and adaptive erroneous operation control, and an image coding apparatus having the variable-length coding apparatus. The variable-length coding apparatus converts quantized data obtained by quantizing image data into variable-length code data, generates a code data string having a predetermined data structure, and inserts padding bits and identifier into the variable-length code data based on an externally-input instruction. Further, the image coding apparatus having the variable-length coding apparatus changes quantization values based on the total code amount of code data string generated by the variable-length coding apparatus.

Image coding apparatus, variable-length coding apparatus, control apparatus and method therof

In image data coding and decoding processing, in order to improve efficiency by processing a plurality of factors in one cycle as long as possible, the factors are rearranged, in coding or decoding processing, in a predetermined scan sequence such that significant factors and 0s are paired. In addition, an appropriate scan sequence is selected in accordance with the distribution state of frequencies to further improve the efficiency.

Image coder/decoder, image coding/decoding method, and storage medium

For always executing an efficient and appropriate error compensation process and improving the convenience of the user, an image processing apparatus and a method enters encoded image data including a marker code for a resynchronizing process within one picture, detects a code error in the encoded image data, and discriminates whether or not to execute an error compensation process utilizing the marker code according to a result of the detection and an attribute of the encoded image data.

Image processing apparatus and method therefor

An image processing apparatus, and a method of controlling the same, for making it possible to execute decoding of compressed image data appropriately, in a processing time needed for decoding that will not detract from user convenience, and in conformity with amount of code error contained in the image. An encoded data input signal has its header information analyzed by a header information processor, which outputs an encoding-parameter output signal. The image information of the encoded data input signal is decoded by a variable-length code decoder, which produces an output signal that is a series of orthogonal transformation coefficient sequences. These two output signals are input to a image data reconstruction unit, which reconstructs the image data. If the encoded data input signal contains a code error, then the encoded data input signal is corrected using correction data. The correction data for correcting the encoded data input signal is decided based upon the number of detection of code errors.

Image processing apparatus and method of controlling same

An encoder () encodes image data using a first parameter Q, and a re-encoder () re-encodes the encoded result of the encoder () using a second parameter Q. When the encoded data size obtained by the encoder () exceeds a predetermined size, Qis replaced by Q, and encoded data streams previously encoded by the re-encoder () are saved in a buffer () as those encoded by the encoder () after the parameter is changed. Upon executing a re-encoding process, the re-encoder () re-encodes encoded data streams previously encoded by the re-encoder () using a parameter that can assure a higher compression ratio than Q

Method and apparatus for encoding image data in accordance with a target data size

A decoding apparatus has: M tables for storing, in correspondence with M types of variable-length code tables, minimum code words or maximum code words of classes of variable-length code words constructing a variable-length code table; a table selector which selects one table from the M tables; N comparators which compare input coded data with the minimum code words or maximum code words outputted from the table selected by the table selector; a switch circuit and a priority encoder which obtain a class number corresponding to an initial code word of the input coded data based on results of comparison by the N comparators; a code length converter which converts the class number into a code length; and an address generator which generates an address to access a memory holding decoded data from the class number and the code length outputted said code length converter. The data outputted from the memory based on the address becomes decoded data of the input coded data.

Decoding apparatus, method, and storage medium for inputting and decoding variable-length coded data

Whether a header information processor quickly enters a program inactive state at the timing when it issues an operation start command of an encoding process for a predetermined processing unit to a variable-length code encoder, or the header information processor enters the program inactive state upon completion of execution steps to be processed is adaptively selected in accordance with the number of execution steps. One memory is shared by the header information processor and variable-length code encoder, and address input permission means for controlling to grant permission of an address input to the memory to one of the header information processor and the variable-length code encoder is provided. The memory is used as a work area of the header information processor, and as a storage area of a variable-length code table which is looked up by the variable-length code encoder.

Image processing method, apparatus, and storage medium

This invention implements a variable-length code pipeline decoding process as hardware by providing additional bit processing means, reducing the load on external control, and clarifying encoded data shift means. For this purpose, in order to determine a code length and additional bit length, two different decode processes are executed, the overall process is separated into three stages, i.e., a stage for shifting out a code word of encoded data, a decode processing stage, and a symbol determination & additional bit processing stage, and these stages are executed in a pipeline manner.

Variable-length decoding apparatus and method

A communication system for connecting a terminal through a communication channel for a communication signal and a control channel for the control signal is constructed by a decoder for decoding a dial signal such as a push button signal that is generated from the terminal, a transmitting unit for transmitting a dial signal according to an output of the decoder to an external line at the time of a current supply, a power supply unit for supplying a current to a dial signal generator provided for the terminal when the terminal is in an off-hook state, and a setting unit for setting control data for the communication system in accordance with the output of the decoder, wherein when a power failure occurs, the dial signal that is generated from the terminal is transmitted to the external line without passing through the decoder.

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Kanagawa, Japan

Yukio Chiba