Structure preserving texture synthesis method based on Chamfer distance

Abstract

A structure preserving texture synthesis method based on the Chamfer distance comprises the steps that a texture sample drawing S and a texture characteristic pattern Fs are synthesized into a four-channel image S', and the format of each pixel is RGBA; the RGB channels of the S' store color values of the sample drawing, and the alpha channel stores a label value in a structure characteristic pattern corresponding to the sample drawing; an output image R' is initialized, an area is selected randomly from the S' and copied to the upper left corner of the R', the R' also has four color channels, the RGB channels store color values of an output texture image, and the alpha channel stores a label value in a structure characteristic pattern corresponding to the output texture image; blocks of the output image R' are synthesized sequentially one by one according to a scanning line; for a block to be synthesized currently, the distance between the block to be synthesized and the edge area of each block in the sample drawing is calculated, and the blocks, with the distances meeting a threshold value, in the sample drawing serve as candidate blocks; a block is selected randomly from the candidate blocks to be placed at the position for synthesis, and the block and a synthesized area form a certain overlapping area; a sewing path with the smallest error is found in the overlapping area, and a newly selected block is sewn into an output texture along the sewing path.

Description

technical field [0001] The present invention relates to sample-based texture synthesis techniques. Background technique [0002] Sample-based texture synthesis technology synthesizes texture patterns of any size visually similar to the sample image according to the input texture sample image, which is one of the research hotspots in the field of computer graphics. Sample-based texture synthesis technology is widely used in texture mapping, image editing, image analogy and so on. [0003] Sample-based texture synthesis techniques are mainly divided into pixel-based synthesis and block-based synthesis. Pixel-based synthesis selects one pixel point from the sample image and copies it to the target texture pattern each time, while block-based synthesis selects a continuous texture area from the sample image each time. Generally, compared with the pixel-based method, the block-based synthesis can better maintain the structure in the continuous texture area, and the execution ef...

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Problems solved by technology

[0004] The present invention requires to overcome the above-mentioned shortcomings of the prior art, and provides a new block-based texture synthesis method, which not only considers the color information of the texture, but also considers the structural characteristics of the texture when searching for a matching block, and solves the problem of synthesizing the structure. The texel structure discontinuity problem that occurs when the texture is prominent, thus improving the effect of texture synthesis

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