Research on Clarity Evaluation of Large Scale Mural Stitching Images Based on Average Gradient
Image stitching technology is one of the key technologies in digital image processing.After collecting large murals using the Orthophoto Scattering methods,image stitching technology is used to form digital images of large murals.The clarity of the mural images needs to be evaluated to ensure that the quality deviation between the stitched images and the original captured images is controllable.In this paper,the Average Gradient(AG)operator is used to calculate and analyze the image sharpness,and the process of image sharpness evaluation is designed,the clarity of murals is calculated by increasing and decreasing,and the true val-ue of the original murals is obtained,by calculating the average gradient values of the original murals with different cave volumes,architectural structures,murals area and wall curvature,the interval of the average gradient values of the original murals is deter-mined.The method of obtaining the average gradient value of Mogao Grottoes mosaic fusion image is put forward,and the evaluation function of the large-scale murals in Cave 172 of Mogao Grottoes is calculated,the results show that it is feasible to use the average gradient operator as an objective evaluation index to evaluate the clarity of fresco mosaic.
Mogao Grottoes muralsdigital technologypicture stitching technologyclarityaverage gradient
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