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Cylindrical surface back projection transformation method

A back-projection and cylinder technology, applied in image data processing, instrumentation, computing, etc., can solve problems such as model failure, cumbersome process, and insufficient scene adaptability

Active Publication Date: 2016-10-12
南京汇川图像视觉技术有限公司
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Problems solved by technology

[0022] The problem to be solved by the present invention is: when constructing the correction model of cylindrical distortion, once the target object of the traditional cylindrical image distortion correction algorithm moves, the model will fail, and recalibration is required, the process is cumbersome and the scene adaptability is insufficient

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Embodiment Construction

[0076] The invention proposes a flexible cylindrical image back projection method. According to the principle of perspective projection, the straight line on the cylindrical surface will be projected into a quadratic curve, so that the imaging characteristics can be characterized by fitting the quadratic curve, and the vertical direction and the horizontal direction can be processed separately, so as to realize the back projection of the cylindrical image transform. When the target object is displaced relative to the camera in the front-back direction and left-right direction, the coefficient of the quadratic curve is corrected to adapt to the change of its imaging characteristics, and no calibration is required again. Experimental results show that the present invention only needs one calibration to meet the requirements of image transformation when the target object moves within a small range, improves the scene adaptability, and has the same accuracy as the traditional meth...

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Abstract

The invention provides a cylindrical surface back projection transformation method. According to a perspective projection principle, a line on a cylindrical surface is projected to a secondary curve. Imaging characteristic of the cylindrical surface is represented through fitting the secondary curve. Correction is performed in the vertical direction and the horizontal direction, and furthermore cylindrical image back projection transformation is realized. When a target object displaces in a front-and-back direction and a left-and-right direction relative to a camera, imaging characteristic change is adapted through correcting the coefficient of a secondary curve, and calibration is not required. Experiment results prove a fact only one calibration is required and a requirement for image transformation in movement of the target object in a small range can be satisfied. Scene adaptability is improved. Furthermore the precision of the cylindrical surface back projection transformation method is equivalent with that of a traditional method.

Description

technical field [0001] The invention belongs to the technical field of computer vision and is used for visual detection of the cylindrical surface of products, which is a cylindrical back projection transformation method. Background technique [0002] Many packages in the food industry are cylinders, such as edible oil barrels, barreled drinking water and milk powder cans, etc. Such products have no edges and corners, are easy to hold, and under the same conditions, cylinders can obtain the largest effective volume. Although the cylindrical packaging brings various conveniences to the processing, the visual inspection of the cylindrical surface has caused great difficulties. For example, during label detection, the image distortion caused by cylindrical imaging makes it difficult to extract straight line features, and the problem of QR code scanning. Therefore, the cylindrical image back-projection transformation technology is of great significance to this kind of detectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/80
Inventor 曹济英周子卿赵鹏陆高勇李勃
Owner 南京汇川图像视觉技术有限公司
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