47results about How to "Reduce the amount of coding" patented technology

In an image encoding / decoding device of the present invention, the prediction direction in a target block, i.e., a block which becomes the target of the intra-frame prediction processing, is estimated by taking advantage of pre-encoded blocks which are adjacent to the target block. First, as edge information on decoded images on the adjacent blocks, intensities and angles of the edges are calculated. Next, of the degrees of likelihood calculated with respect to each prediction direction by taking advantage of this edge information and, e.g., a neural network, the prediction direction whose degree of likelihood is the highest is employed as the prediction direction in the target block. Also, a variable-length code table is dynamically created based on the estimated result, which allows a significant reduction in the prediction-direction representing code amount.

A first decoder unit (521) decodes an encoded stream to acquire a differential motion vector. A second decoder unit (522) decodes the encoded stream to acquire predicted motion vector selection information. A motion vector selection unit (525) sets candidates of a predicted motion vector for a block to be decoded and selects, as the predicted motion vector, a motion vector, which is indicated by the predicted motion vector selection information, out of those candidates. An addition unit (526) adds the differential motion vector to the predicted motion vector, thereby calculating the motion vector of the block to be decoded. In this way, the predicted motion vector is optimized to improve the encoding efficiency and the picture quality.

The invention discloses a coding method and device for a video image, and belongs to the field of video coding and decoding. The coding method disclosed by the invention comprises the steps of: extracting a luminance component from a video image, determining a distortion measurement value, obtaining a first threshold value and a second threshold value corresponding to the video image according to the distortion measurement value, determining control parameters according to the first threshold value and the second threshold value, and coding the video image based on the control parameters, so that a coded video image is obtained. The just-noticeable difference (JND) is utilized; therefore, the weak estimation problem for the JND threshold value of a disordered region in the previous JND model is overcome; the spatial redundancy in a video sequence is effectively eliminated; the coding amount is reduced; the coding efficiency is increased; simultaneously, the JND of an ordered region is estimated more accurately by utilization of the obtained luminance mask and spatial mask, so that the perceived quality of the ordered region in a video can be well improved conveniently; and thus, the overall viewing experience of the video can be improved.