Sony Corporation

Toru Okazaki

Shunji Yoshimura

Yoichi Yagasaki

Teruhiko Suzuki

Kenji Ogawa

Tatsuya Sudo

Kazushi Sato

Junichi Tanaka

Yasushi Fujinami

Jun Yonemitsu

Katsumi Tahara

Yasuhiro Muramatsu

Naoyuki Kinebuchi

Yoshiaki Matsumura

There is provided a moving image recording apparatus including a feature amount extracting unit which extracts plural types of feature amount data relating to feature amounts characterizing moving image data from the moving image data, a memory unit at which the plural types of feature amount data extracted by the feature amount extracting unit and the moving image data are recorded being mutually associated, and a duplicate content searching unit which searches duplicate contents being mutually duplicated moving image data out of a plurality of the moving image data stored in the memory unit based on the plural types of feature amount data.

Moving image recording apparatus, moving image recording method and program

An image processing system includes a decoder configured to decode an encoded image and an encoder configured to encode the image decoded by the decoder. The decoder includes a decoder adapted to decode the encoded image, and a detector adapted to detect, on the basis of the image, a fade period included in the image and supply a fade information signal indicating a detection result to the encoder. The encoder includes an acquisition unit adapted to acquire the fade information signal, and a changing unit adapted to change a process performed in the encoding of the image in accordance with the fade information signal.

Method and system for processing an image, method and apparatus for decoding, method and apparatus for encoding, and program with fade period detector

The reverse direction reproduction of encoded data comprised of picture data compressed in accordance with the MPEG system is to be realized at a higher speed. To this end, plural frame memories are used for reverse direction reproduction. The respective pictures are sequentially decoded and the decoded pictures are sequentially held in the frame memories. If there is no vacant memory, the frame memories are sequentially overwritten beginning from the frame memory which stores the picture decoded first. If the decoding progresses up to the picture to be reproduced, and the decoding of the picture to be reproduced comes to a close, the decoding is transiently halted and the picture to be reproduced is read out from the frame memory and displayed. If the picture to be reproduced is displayed, the frame memory which has held the displayed picture is evacuated. The decoding is re-initiated for decoding the picture consecutive to the picture the data of which are as yet held in the frame memory.

Reproducing method and apparatus

The present invention enables to obtain a video representation with a smooth motion during a fast reproduction of a video signal which has been prediction coded in the time axis direction. A video signal reproduction apparatus includes a controller having a detection block , a decision block , and mode switching block . According to an information from a demultiplexer and a decode information from a video decoder , the controller detects a reproduction speed in the detection block . The detected reproduction speed is supplied to the decision block where it is compared to a predetermined threshold value so as to select a first fast reproduction mode requiring reproduction of all the reference pictures of the video signal which has been prediction coded or a second fast reproduction mode requiring reproduction of some the reference pictures. According to this decision result, the mode switching block switches between the first and the second rast reproduction modes.

Video signal reproduction apparatus and method

The present invention provides a controller operation in such way that in the forward slow reproduction or the forward stepped reproduction mode, when reproducing a video signal from a bit stream of coded video signal in which each frame consists of a first field and a second field, if a currently reproduced picture is the bottom field, a reproduction position pointer is shifted to the next frame to be reproduced.

A coding method, decoding method, coding system, and decoding system for efficiently variable length coding and variable length decoding quantized data compared with existing ones. Input data is variable length coded by using a variable length coding table 23C or 23D selected among a plurality of variable length coding tables 23C and 23D prepared in accordance with a coding efficiency. Thereby, it is possible to further improve a variable length coding efficiency compared with a case for using only one variable length coding table. As a result, when generating information content equal to that generated by using only one variable length coding table, it is possible to process data quantized with smaller quantized size and further improve the quality of information transmitted as coded data.

Coding method and system, and decoding method and system

In the present invention, a partly duplexed conversion table is used as a conversion table for converting an M-bit based data string directly into an N-bit based code string without using margin bits. This conversion table is constituted by first and second sub-tables including plural code groups, respectively. The plural code groups include different codes for the same input data. The second sub-table is a table which is partly duplexed with the first sub-table and is produced by allocating different codes to data from first input data to second input data in the first sub-table. The first and second sub-tables are so designed that code sets of the duplexed portions take variants of digital sum variations which are opposite in sign. Codes are allocated to all the code groups in the duplexed portions of the first and second sub-tables with respect to input data sequentially from a code having a maximum absolute value of variant of the digital sum variation. Thus, according to the present invention, low frequency components of modulated signals may be restricted properly.

Signal modulating method, signal modulating apparatus, signal

Method and apparatus, demodulating method and signal demodulating

A signal binary coding circuit and a recording medium reproducing apparatus can binary coding efficiently the input signal sampled by the discrete time, by providing: a subtracting circuit for subtracting direct current components from the sampled value input; a comparator circuit for comparing the output value of said subtracting circuit and a threshold and outputting the binary signal based on said comparison value; an amplitude limiting circuit to amplitude-limit the output value of the subtracting circuit with the fixed value; and a direct current component forming circuit to calculate direct current components from the output value of the amplitude limiting circuit.

Signal binary coding circuit and digital signal processing apparatus

Picture signal reproducing method and picture signal reproducing

Mismatch errors occur in the local decoder of a MPEG-standard compressor for a motion picture signal, and in an MPEG-standard expander for a compressed motion picture signal. This is because of the lack of a standard for rounding results of *.5 (* is an integer) obtained when a set of transform coefficients resulting from compressing the motion picture signal is inversely orthogonally transformed. The invention prevents mismatch errors by pre-processing the set of transform coefficients prior to the inverse orthogonal transform. The transform coefficients in the set are summed, and the parity (odd or even) of the sum is judged. When the parity of the sum is judged to be even, the parity of one of the transform coefficients in the set is inverted to provide a parity-inverted transform coefficient. This makes the parity of the sum odd. Then, when the set of transform coefficients including the parity-inverted transform coefficient is inversely orthogonally transformed, none of the results of the orthogonal transform will have a value of *.5.

Method of recording a compressed motion picture signal in which effects

An apparatus for reproducing an optical disc in which a light beam radiated from a light source in an optical pickup is radiated to an optical disc and the return light from the disc is detected by a photodetector provided within the optical pickup for reproducing the information signal recorded on the optical disc. A detection output of the return light from the optical disc as detected by the optical pickup is supplied to a waveform equalizer and to a quantity of skew-calculating circuit for detecting the quantity of skew of the optical disc. An output of the waveform equalizer is further supplied to a demodulating circuit. An output of the quantity of skew calculating circuit is inverted in polarity by a polarity inverting circuit and thence supplied to an integrating circuit an output of which is supplied to a control circuit for controlling a correction device for correcting the disc skew. The control circuit for controlling a correction device for correcting the disc skew drives a disc skew correcting circuit provided in the optical pickup in a direction of correcting the tangential skew of the track on the optical disc.

Method and disc apparatus for reproducing information signals and

Mismatch errors occur in the local decoder of a MPEG-standard compressor for a motion picture signal, and in an MPEG-standard expander for a compressed motion picture signal. This is because of the lack of a standard for rounding results of *0.5 (* is an integer) obtained when a set of transform coefficients resulting from compressing the motion picture signal is inversely orthogonally transformed. The invention prevents mismatch errors by pre-processing the set of transform coefficients prior to the inverse orthogonal transform. The transform coefficients in the set are summed, and the parity (odd or even) of the sum is judged. When the parity of the sum is judged to be even, the parity of one of the transform coefficients in the set is inverted to provide a parity-inverted transform coefficient. This makes the parity of the sum odd. Then, when the set of transform coefficients including the parity-inverted transform coefficient is inversely orthogonally transformed, none of the results of the orthogonal transform will have a value of *0.5.

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Tokyo, Japan

Toru Okazaki