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Boundary detecting method and device of net image

A boundary detection and image technology, which is applied in the field of image processing, can solve the problem of low boundary positioning accuracy of hanging network images, and achieve the effect of improving the boundary positioning accuracy

Active Publication Date: 2012-09-12
PEKING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a boundary detection method of a hanging net image to solve the problem in the prior art that the boundary positioning accuracy of the hanging net image is not high

Method used

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  • Boundary detecting method and device of net image
  • Boundary detecting method and device of net image

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Experimental program
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Effect test

Embodiment 1

[0082] Image 6 When the current pixel is a thin line of a single pixel on the boundary, or a special point in the horizontal or vertical direction, the flow of the method for determining whether the current pixel is a pixel on the boundary mainly includes:

[0083] Step 601: Determine the detection template for detecting the current pixel point as the special point detection template.

[0084] Step 602: Using the special point detection template, calculate the response value of the current pixel.

[0085] Step 603: Determine whether the response value of the current pixel point is greater than the response value of the pixel point adjacent to this pixel point, if yes, continue to step 604, otherwise, go to step 606.

[0086] Step 604: Determine whether the difference between the response value of the current pixel point and the adjacent pixel point is greater than the set threshold, if yes, continue to step 605, otherwise, go to step 606.

[0087] Step 605: Determine that t...

Embodiment 2

[0090] Figure 7 When the current pixel point is not a point on a thin line of a single pixel point, or a special point in the horizontal and vertical directions, the method flow for determining whether the current pixel point is a pixel point on the boundary mainly includes:

[0091] Step 701: According to the boundary direction of the current pixel point, select a direction detection template whose angle is consistent with the boundary direction.

[0092] For example, if the boundary direction of the current pixel point is 22.5°, select a direction detection template with an angle of 22.5° as the boundary detection template of the current pixel point. Wherein, the direction detection template is an N×N coefficient matrix, and N is an integer greater than 1.

[0093] Step 702: Using the direction detection template, calculate the response value of the current pixel.

[0094] First, the center of the direction detection template is coincident with the current pixel point, an...

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Abstract

The invention discloses boundary detecting method and device of a net image, used for solving the problems of low boundary positioning precision and discontinuity of the detected boundary of the net image in the prior art. The method comprises the following steps of: confirming a plurality of detecting templates with the dimension quantity of N*N according to a Soble-Gaussian operator and a standard Gaussian operator of each confirmed detecting template; then selecting and detecting the detecting template of current pixel point according to the attribute information of the current pixel point; calculating a response value of the current pixel point by the detecting template and confirming whether the current pixel point is the pixel point on the boundary or not by comparing with the magnitude relation of a response value of a pixel point which is adjacent to the current pixel point. The provided scheme can directly carry out boundary detection on the boundary of the net image in all directions and improves the boundary positioning precision of the net image.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and device for detecting the boundary of a hanging net image. Background technique [0002] For binary devices such as printers, before printing, the image to be printed needs to be processed by image netting. Compared with the original image with continuous tone, the image after netting processing has discrete characteristics, so it is necessary to directly process the netting image Processing becomes very difficult. Therefore, in the prior art, before processing the net-hanging image, it is first necessary to determine the boundary position of the net-hanging image, and then process the net-hanging image. [0003] At present, the method of detecting the boundary position of the hanging net image is to directly use the Sobel or Gaussian template, use the gray scale weighting algorithm of the upper and lower, left and right adjacent points of the pixel point, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 李平立袁梦尤纪延瑶六尾敏明
Owner PEKING UNIV