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In order to optimize the performance of Criminisi algorithm in repairing the large defect area, this paper proposes a digital image restoration model of structural continuity optimization Criminisi algorithm for the shortcomings of the structural connectivity of the damaged image. Firstly, a new priority function is designed to avoid the influence of zero of the confidence item and the data item, and the proportion of the structural component in the region to be repaired is strengthened, and the structural continuity in the repair result is strengthened. And then to improve the repair rate, without affecting the repair results under the premise of a faster search and more comprehensive block matching criteria, search for matching block using the local search, and the use of improved block matching criteria, access ,more reliable matching block at the same time, speed up the repair rate. Finally, the experimental results show that the improved Criminisi algorithm is more effective and faster in repairing large defect areas.

Criminisi Image Concealment Algorithm Based on Priority Function and Blocking Matching Principle