Nippon Hoso' Kyokai

Kazuhisa Iguchi

Atsuro Ichigaya

Shunsuke Iwamura

Shimpei Nemoto

Shinichi Sakaida

Seiichi Gohshi

Yoshiaki Shishikui

Yuichi Kondo

An image encoding device () includes a motion compensation predictor () configured to generate a prediction image corresponding to a target image by performing motion compensation prediction using a plurality of reference images, and an evaluator () configured to evaluate prediction accuracy of the prediction image for each image portion including one or more pixels by calculating a degree of similarity between the plurality of reference images for each image portion.

Image encoding device, image decoding device and program

A deblocking filter device according to a first feature includes: a deblocking filter configured to perform a filter process on a boundary between a first reconstructed block and a second reconstructed block adjacent to the first reconstructed block; and a filter controller configured to control boundary filtering strength of the deblocking filter based on whether or not at least one of the first reconstructed block and the second reconstructed block is encoded using JCCR (Joint coding of chroma residual) in which one joint prediction residual is generated from prediction residuals of a Cb chrominance component and a Cr chrominance component.

Deblocking filter device, decoding device and program

An encoding deviceincludes: a transformerconfigured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantizerconfigured to generate quantization coefficient by quantizing the orthogonal transform coefficient based on a quantization parameter; an entropy encoderconfigured to generate encoded data by encoding the quantization coefficient; an image decoderconfigured to restore an orthogonal transform coefficient from the quantization coefficient based on the quantization parameter and generate a pre-filtering image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filterconfigured to perform a filtering process on the pre-filtering image and control a filtering strength depending on a result of comparison between a luminance signal level of the pre-filtering image and a luminance threshold value.

Encoding device, decoding device, and program

Luminance deblock filtering encoding device, decoding device, and program

In the present invention, at least two component signals that represent luminance and a color difference in an original signal having a predetermined image format are encoded/decoded. This encoding device () is equipped with: a local decoding section (------) that generates a locally decoded signal of a second component signal; a luminance-color difference prediction unit () that generates a parameter for normalizing the second component signal by comparing the original signal of a first component signal not yet encoded with the locally decoded signal of the second component signal in order to generate a luminance-color difference prediction signal; a prediction signal generation unit (-) that generates a prediction signal for an intra-screen prediction or a prediction signal for an inter-screen prediction regarding the first component signal; a synthesis unit () that performs a weighted addition of the prediction signal and the luminance-color difference prediction signal in order to generate a corrected prediction signal for the first component signal; and an encoding section (----) that generates and encodes a difference signal between the corrected prediction signal and the original signal of the first component signal.

A prefilter for use in a compressive coding apparatus, the compressive coding apparatus including the prefilter for limiting a frequency band of an input image and a compressive coding unit for implementing compressive coding of an image signal of which frequency band is limited with the prefilter, the prefilter includes: a time filter unit; a two-dimensional filter unit; and an enhancement unit. A compressive coding pre-processing apparatus provided with the prefilter includes: a prefilter unit for attenuating a diagonal frequency component of each image; a pixel skipping unit for skipping a pixel of an image signal of which diagonal frequency component is attenuated by the prefilter unit by folding back a horizontal high frequency component to a vertical high frequency component, or folding back the vertical high frequency component to the horizontal high frequency component; and a pixel space contracting unit for contracting a space of the skipped pixel.

Prefilter, compressive coding pre-processing apparatus and decompressive decoding post-processing apparatus, and compressive coding apparatus and decompressive decoding apparatus

Growing community of inventors

Tokyo, Japan

Kazuhisa Iguchi