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Image stretching distortion adaptive correction method

A correction method, image stretching technology, applied in image enhancement, image analysis, image data processing and other directions

Inactive Publication Date: 2015-11-11
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the straight lines in the image scene will be bent due to the correction of the stretching of the object. Therefore, it is necessary to correct the stretching distortion while keeping other scenes or objects unaffected.

Method used

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  • Image stretching distortion adaptive correction method

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Embodiment Construction

[0075] The self-adaptive correction method for image stretching distortion of the present invention includes accepting an image with stretching distortion of an object; dividing the image with a uniform grid and establishing an input and output coordinate system; detecting the face of the input image through a face detection algorithm Position and size, and use this information to determine the rectangular area where the character is located and the remaining background area; establish homography constraints for each area to correct the stretching distortion in the character area, and establish a homography for the adjacent area Responsive compatibility constraints to ensure the continuity of each area; determine the straight line area through the straight line detection algorithm, and establish a straight line maintenance constraint for the straight line area to ensure that the corrected straight line does not appear curved; establish global coordinate smoothness and uniformity...

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Abstract

The invention provides an image stretching distortion adaptive correction method comprising: dividing an image into uniform square grids and establishing an input-output coordinate; determining a person area and a background area by using a face detection algorithm, establishing homographic constraint for each grid in order to correct the stretching distortion appearing in the person area, establishing homographic compatible constraint for adjacent grids in order to guarantee the continuity of the grids; determining a linear area by using a linear detection algorithm and establishing linear maintaining constraint for the linear area in order to protect a corrected line against bending; guaranteeing the uniform continuity of the whole image by means of global coordinate smoothness and uniformity constraint; using an energy function to express the constraint, adding weights and adding the energy equations, computing a coordinate value with the minimum energy by using a least square method so as to obtain a corrected image coordinate value; performing rendering by using bilinear mapping to obtain a final corrected image.

Description

technical field [0001] The invention relates to a digital image processing technology, in particular to an image stretching distortion adaptive correction method. Background technique [0002] The wide-angle lens of the camera can obtain images with a larger field of view, but it is also easy to introduce image distortion. One of the distortions is that when the wide-angle lens follows the pinhole imaging model for imaging, and there is an object in the imaging scene that is close to the camera and at the edge of the field of view, the object in the captured image will be severely stretched due to the perspective effect, causing the object Distortion of geometric shapes. Especially when the object is a human face or a person, since the human eye is more sensitive to the distortion of the image of the human face or person, the stretching distortion becomes more obvious. Therefore, it is necessary to correct the image with stretching distortion of the object so that the imag...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T3/60
CPCG06T3/608G06T2207/10004G06T2207/10052G06T5/80
Inventor 冯华君杨波
Owner ZHEJIANG UNIV
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