Kddi Corporation

Kddi R&d Laboratories, Inc.

Tomonobu Yoshino

Sei Naito

Shigeyuki Sakazawa

Sei Naitou

Atsushi Koike

A moving image coding device includes: a evaluation unit configured to approximate a parameter of a statistic in accordance with a distance from a reference pixel located along the intra prediction direction to a pixel to be processed; a feature amount calculation unit configured to calculate, for a pixel near the pixel to be processed, a feature amount of a prediction value that is based on the intra prediction direction; and a prediction value calculation unit configured to estimate a prediction error corresponding to the distance using the parameter of the statistic approximated by the evaluation unit, reflect the prediction error in the prediction value that is based on the intra prediction direction using the feature amount calculated by the prediction value feature amount calculation unit, and generate a new prediction value.

Moving image coding device, moving image decoding device, moving image coding method and moving image decoding method

A video encoder according to the present invention improves coding efficiency of a super high definition video by setting an area of MB size and optimally determining size of the area. A locally decoded image (a) is subjected to frequency analysis in a frequency analyzing unit. Based on the result, an area setting unit sets a local area in a picture to which the maximum MB size is applied. An area boundary correcting unit corrects an area boundary in accordance with a representative motion characteristic, and an N-value calculating unit determines the maximum MB size (N&#xd7;N) of each area based on a result of encoding a neighboring picture. The area setting and the N-value calculation are performed step by step.

Video encoder and its decoder

A video encoding apparatus, video encoding method, and computer program, which are capable of employing an adaptive filter that provides improved encoding performance while reducing the processing cost required for calculation. A video encoding apparatus estimates interpolation filter coefficients by means of an image frequency characteristic analysis. When a loop continuation condition is satisfied, the video encoding apparatus performs re-estimation of the interpolation filter coefficients. As the loop continuation condition, a first condition can be used, in which the number of times the re-estimation has been consecutively performed for the current frame to be processed is smaller than a predetermined number, for example.

Video encoding apparatus, video encoding method, and computer program

It is a purpose of the present invention to provide a video encoding apparatus and a video decoding apparatus which are capable of providing real-time processing having improved coding performance. A video encoding apparatus AA includes an inter-encoding predicted value generating unitconfigured to receive, as input signals, an input image a, a local decoded value d acquired from an encoded block, prediction direction information e acquired from the encoded block, and interpolation filter initial control information b. The inter-encoding predicted value generating unitincludes a filter control unit. The filter control unitextracts the tap size N of the interpolation filter and the initial value c(i,j) of the filter coefficient of the interpolation filter from the interpolation filter initial control information b, and uses the initial value c(i,j) of the filter coefficient of the interpolation filter as the filter coefficient c(i,j) of the interpolation filter.

Video encoding apparatus and video decoding apparatus

It is a purpose of the present invention to provide a video encoding apparatus, a video decoding apparatus, a video encoding method, a video decoding method, and a computer program, which allow adaptive filter coefficients to be used with a reduced amount of coding. A video encoding apparatus AA selects a suitable coefficient from among multiple kinds of interpolation filter coefficients determined beforehand by means of a component external to the video encoding apparatus AA. Subsequently, the video encoding apparatus AA records identification information uniquely defined for the selected interpolation filter coefficient in control information for each slice. Furthermore, the video encoding apparatus AA uses the interpolation filter coefficient thus selected to generate encoded data c including the identification information uniquely defined for the interpolation filter coefficient thus selected.

Video encoding apparatus, video decoding apparatus, video encoding method, video decoding method, and computer program

There is provided an intra prediction system having high prediction performance and satisfactory encoding efficiency in a pattern image in which pixel value is periodically changed and a pattern image in which pixel value has a constant change tendency like gradation effect. A frequency component extraction unit allows a pixel value of an encoded MB to be made one-dimensional for one-dimensional orthogonal conversion. A frequency component-considering prediction value calculation unit receives, as inputs, a pixel value of an encoded adjacent MB and an alternating current frequency component output to create an orthogonal conversion coefficient. The orthogonal conversion coefficient then is subjected inverted orthogonal conversion (IDCT) to generate a prediction value p(i). A prediction direction determination unit selects and outputs a prediction value p'(i) in a prediction direction having the highest encoding efficiency among a conventional prediction value calculation unit and a prediction value calculation unit according to the present invention.

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Saitama-ken, Japan

Tomonobu Yoshino