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Cuboid surface perspective distortion correction method based on vanishing line

A perspective deformation, cuboid technology, applied in image enhancement, image analysis, instruments, etc., can solve the problems of large difference in regional description, bad influence of feature extraction and matching, difficulty in similarity measurement, etc., and achieve high structural similarity. Effect

Inactive Publication Date: 2012-06-27
SHANDONG UNIV
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Problems solved by technology

[0004] When performing feature extraction and similarity measurement on images, the general image has a certain perspective deformation, and the perspective deformation of the image will have a negative impact on feature extraction and matching; especially when extracting regional features, the two images on the The region description corresponding to the feature points will be very different due to the existence of perspective deformation, and it is difficult to measure the similarity

Method used

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  • Cuboid surface perspective distortion correction method based on vanishing line
  • Cuboid surface perspective distortion correction method based on vanishing line
  • Cuboid surface perspective distortion correction method based on vanishing line

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] The present invention first utilizes the image acquisition system to collect rectangular images, such as Figure 3a-Figure 3d For DVD ReWrite box images taken from any four angles, Figure 6a-6d are the four images of obj1 in the Columbia University image database coil-100. Find the four sides of the cuboid surface through edge detection and intercept the area surrounded by them, such as Figure 4a-Figure 4d for corresponding to Figure 3a-Figure 3d The extracted cuboid surface to be corrected, Figure 7a-7d for corresponding to Figure 6a-6d The extracted cuboid surface to be corrected. Then interpolate the area enclosed by the intercepted trapezoid. The detailed steps of this method are as follows:

[0050] Step1: Use the corrosion algorithm in morphology to detect the edge of the collected image, use the Radon transformation algorithm to ...

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Abstract

The invention discloses a cuboid surface distortion correction method, which includes: firstly utilizing an image acquisition system to acquire a rectangular image, finding four edges of a cuboid surface through edge detection, intercepting an area defined by the four edges, and then interpolating the intercepted area defined by a trapezoid to obtain a correction image. By means of determination of a vanishing line of the image, the cuboid surface distortion correction method interpolates the image proportionally in the vanishing line direction and the perpendicular direction of the vanishing line to complete correction of projection transformation and affine transformation of the image finally. The method only needs one image and can complete restoration of the original rectangular image. Length-to-width ratio of the corrected image is the same as that of an actual rectangular face.

Description

technical field [0001] The invention relates to a digital image processing and spatial image transformation technology, in particular to a method for correcting perspective deformation of a cuboid surface based on disappearing lines. Background technique [0002] With the development of the market economy, enterprises pay more attention to the appearance quality of products while continuously improving the internal quality of products. The disadvantages of manual inspection of product appearance quality are obvious, which creates new application fields for machine vision. Machine vision technology is a multidisciplinary science that integrates information processing technology, image processing technology, biophysics, psychology and other disciplines, and is one of the rapidly developing disciplines in recent years. [0003] Automatic detection of object surface quality is a specific application of computer vision. Through image acquisition, de-perturbation, image segmentat...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/00
Inventor 杨明强郑全新李文辉
Owner SHANDONG UNIV
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