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Quick method for picking up stepped edge in sub pixel level

A technology of seed pixels and extraction methods, applied in image analysis, image data processing, instruments, etc., can solve the problems of being unsuitable for machine vision and related image processing, such as fast real-time requirements, cumbersome calculation, and slow image processing speed, and achieve high precision. , the initial value selection is simple, the extraction speed is fast

Inactive Publication Date: 2007-12-26
BEIHANG UNIV
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Problems solved by technology

The common disadvantages of these two types of methods are that the calculation is cumbersome and the image processing speed is slow, which is not suitable for the fast real-time requirements of machine vision and related image processing.

Method used

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  • Quick method for picking up stepped edge in sub pixel level

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Embodiment Construction

[0025] The present invention will be described in further detail below.

[0026] The step edge contour model function is shown in Figure 1. According to the step edge shape, the step edge profile model can be defined as:

[0027] y = a 1 + e x - b σ + c - - - [ 1 ]

[0028] Among them, a, b, and c are position parameters, and σ represents the variance. The geometric meaning of the three parameters is: a represents the height of the edge, that is, the difference between the maximum and minimum steady-state values ​​of the curve; b represents the abscissa of the symmetrical center position of the edge; c represents the base value of...

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Abstract

The invention belongs to the machine vision and related image processing techniques, relating to the improvement of an image edge extracting method. The steps of the invention: making smooth filtering processing on the original image; searching a boundary point Ps with steady-state grey scale maximum value and a boundary point Pe with steady-stage grey scale minimum value of a step edge; calculating initial values a0, b0 and c0 of edge model parameters; calculating the optimum values of a, b and c and determining the step edge. The initial value selection of the model parameters is simple, and the step edge extraction has high speed, strong robustness and high accuracy.

Description

technical field [0001] The invention belongs to machine vision and related image processing technology, and relates to the improvement of image edge extraction method. Background technique [0002] The most basic feature of an image is the edge. The so-called edge refers to the set of pixels in the image that have a step change or a roof-like change in the pixel gray level. It is related to the discontinuity of the image brightness or the first derivative of the image brightness, thus appearing as step edges and line edges. The step edge shows that there is an obvious difference in the gray value of the pixels on both sides of the discontinuity in the brightness of the image. This difference is visually manifested as the transition of the image from a bright scene to a dark background, or from a bright background to a dark scene. . For machine vision and related image processing, pixel-level step edge extraction cannot meet the requirements. The accuracy of step edge extr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/60G06T7/13G06T7/181
Inventor 张广军贺俊吉魏振忠
Owner BEIHANG UNIV
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