US 8,897,585 B2 · Prediction of pixels in image coding

Abstract

A method and arrangement for prediction of pixel values in an image decoder. In an image decoder, a reference vector which is provided by an image encoder is provided 500. An initiation region of pixels is determined 502, which corresponds to a reference region of pixels at the image encoder. The initiation region is spatially displaced in relation to the prediction region according to the reference vector, and a part of the initiation region overlaps a part of the prediction region. Pixel values are assigned 504 to pixels of the prediction region, whose corresponding pixel values in the initiation region are known. Pixel values of the overlapping region of the initiation region are assigned 506 to the corresponding pixels in the prediction region, the pixel values being assigned 504. By determining an overlapping initiation region based on a dynamic reference vector, characteristic variations close to the prediction region are possible to utilise when predicting images, which increases the accuracy of the prediction.

Claims14

Dependent claims

A method in an image decoder for assigning pixel values to pixels in a prediction region of an image, the method comprising:

obtaining a reference vector provided by the image encoder,
determining an initiation region of pixels corresponding to a reference region of pixels at the image encoder, the initiation region being spatially displaced in relation to the prediction region according to the reference vector and partly overlapping with the prediction region, wherein pixel values of pixels in overlapping parts of the initiation and prediction regions are unknown,
assigning pixel values to the pixels in the overlapping parts of the initiation and prediction regions by assigning known pixel values of pixels in a non-overlapping part of the initiation region to pixels in a corresponding part of the prediction region, wherein the pixels in the corresponding part of the prediction region at least include the pixels in the overlapping parts of the initiation and prediction regions, and
assigning the pixel values assigned to the pixels in the overlapping part of the initiation region to the corresponding pixels in the prediction region.

1 more element

An arrangement in an image decoder adapted to assign pixel values to pixels in a prediction region of an image, the arrangement comprising:

a receiver configured to obtain a reference vector provided by the image encoder and receive pixel values from the image encoder,
a first memory configured to store the reference vector,
a second memory configured to store pixel values of one or more images, and
a processor configured to determine an initiation region based on the prediction region and the reference vector, the initiation region being partly overlapping with the prediction region, wherein pixel values of pixels in overlapping parts of the initiation and prediction regions are unknown,
the processor being further configured to assign pixel values to the pixels in the overlapping parts of the initiation and prediction regions by assigning known pixel values of pixels in a non-overlapping part of the initiation region to pixels in a corresponding part of the prediction region, wherein the pixels in the corresponding part of the prediction region at least include the pixels in the overlapping parts of the initiation and prediction regions, and further configured to assign the pixel values assigned to the pixels in the overlapping part of the initiation region to the corresponding pixels in the prediction region.

2 more elements

Dependencies are inferred from the claim text.

Prediction of pixels in image coding

Life of this patent

Prediction of pixels in image coding

Life of this patent

Abstract

Claims14