Method for fast picking up picture with any image as background in digital image process

A technology for digital images and backgrounds, applied in the field of fast matting, can solve problems such as rough adjustment and poor matting effect, and achieve the effect of solving speed and effect, improving matting effect, and increasing the amount of calculation.

Inactive Publication Date: 2003-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the known methods, except for the Knockout method, the other methods do not adjust the foreground and back

Method used

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  • Method for fast picking up picture with any image as background in digital image process
  • Method for fast picking up picture with any image as background in digital image process
  • Method for fast picking up picture with any image as background in digital image process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Figure 5 zoom in figure 1 It is composed of three parts, the left is the original image, the middle is the grayscale image, and the right is the composite image with black background. The Knockout method is zooming in figure 1 Some hair strands are not cut out in the middle, and they are enlarged figure 1 The result is distorted on some points. In the Ruzon&Tomasi method, some hair strands are severely broken, and there are obvious discontinuities in the composite image. The effect of Chuang's method is better, but on closer inspection, it can be found that the amplification figure 2 There is a slight discontinuity at the bottom of the figure 1 There are also slight discontinuities. The method according to the invention does not have the above-mentioned disadvantages in this example.

Embodiment 2

[0049] Figure 6 The window method is zooming in figure 1 In the area inside the two ellipses in , the matting result is wrong or there are impurities. Inside the upper small ellipse, a part of the hair was forcibly cut off, and the cutout result here is wrong, while inside the lower big ellipse, a piece of impurity appeared. The method of the present invention then handles these problems well.

Embodiment 3～6

[0051] Figure 7 (a) is an example of Gandalf, (b) is an example of Galadriel, (c) is an example of Tiger, and (d) is an example of Water.

[0052] The main points of the fast matting method with an arbitrary image as the background in digital image processing are:

[0053] 1. Manually divide the area to ensure that the contour line passes through the appropriate area and has sufficient accuracy;

[0054] 2. The sample points used in color estimation are points on the contour line inside the circle, and the length of the radius of the two circles is generally 1.5 to 3.0 times the shortest distance;

[0055] 3. Adjust the estimated foreground and background colors to turn point C into a regular point;

[0056] 4. Use the adjusted color to estimate the alpha value of point c.

[0057] The accuracy of region division has a great influence on the accuracy of natural image matting. The following points should be paid attention to when matting: ① Make sure that all points inside...

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Abstract

A fast splitting method for image includes the following steps: a) splitting the image into three parts of foreground area, unknown area and background area; b) calculating colour component F and B for foreground and background by setting any point C in unknown area as colour of according to the split areas; and c) adjusting colour value for F and B according to the estimated colour component of foreground and back ground, and finally to estimate alpha value of c point.

Description

technical field [0001] The invention relates to a fast image-cutting method with an arbitrary image as the background in digital image processing. Background technique [0002] Cutout technology is an image processing technique that separates the foreground part of any image from the background. It has extensive and in-depth applications in the production of film and television special effects and special effects. According to whether there are restrictions on the image background, the matting technology can be roughly divided into two categories: [0003] Restrictions on the image foreground or background can be further divided into blue screen matting and difference matting. The blue screen cutout technology has certain restrictions on the background of the image. The background is usually a fixed color, usually blue or green, or multiple images with the same foreground are prepared, and the background colors in these images are used to achieve acc...

Claims

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Application Information

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IPC IPC(8): G06T1/00H04N5/253H04N5/262H04N5/272
Inventor 林生佑石教英
Owner ZHEJIANG UNIV
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