Digital image deformation characterization method and device, electronic equipment and medium
A digital image and image quality technology, applied in the field of optical measurement, can solve the problems that the size of the unit or sub-area is difficult to meet the requirements, and the size of the unit or sub-area is difficult to select, so as to achieve high precision and accuracy, and easy to use.
Active Publication Date: 2020-07-03
PEKING UNIV
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Problems solved by technology
At this time, not only the selection of unit or sub-area size is more difficult, but even uniformly distributed unit or sub-area size will be difficult to meet the requirements
[0006] The above problems limit the further application of digital speckle correlation methods in complex problems
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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0043] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.
[0044] f...
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The invention discloses a digital image deformation characterization method and device for image quality and deformation gradient regulation, electronic equipment and a medium. The digital image deformation characterization method comprises the following steps: providing speckle images before and after deformation; aiming at the speckle images before and after deformation, determining the minimumsize value of a unit or a sub-region through the change of the Hessian matrix condition number; roughly calculating a displacement field by searching or appointing initial grid or sub-region distribution through an integer pixel according to the minimum size value of the unit or sub-region; according to a displacement field and a tangent vector correlation function C (r) = (t (s) * t (s + r)) min= C0, determining a unit or sub-region size maximum value; and judging whether a convergence condition is satisfied or i is greater than N according to the determined maximum size value of the unit orthe sub-region, i being the number of iterations and N being the number of cycles, and if so, outputting a current displacement field to realize digital image deformation representation of image quality and deformation gradient regulation and control. The method is suitable for complex deformation conditions and image quality, has higher precision and accuracy, and is easy to use.
Description
technical field [0001] The invention relates to the technical field of optical measurement, in particular to a digital image deformation characterization method, device, electronic equipment and medium for image quality and deformation gradient control. Background technique [0002] The digital speckle correlation method is an optical measurement method that obtains the corresponding deformation field by comparing the speckle information contained in the speckle images before and after deformation. This method has the advantages of no damage to the test piece, easy operation, and adaptability to harsh test environments (such as high temperature and high pressure), and has been widely used in aerospace, biomedical and other fields. [0003] Digital speckle correlation methods can be divided into local digital speckle correlation and global digital speckle correlation, in which local digital speckle correlation is to divide a series of independent sub-regions in the image, whi...
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IPC IPC(8): G06T7/00G06T7/60G01B11/16
CPCG06T7/0002G06T7/60G01B11/16G06T2210/44
Inventor 黄建永段晓岑
Owner PEKING UNIV