Blotch Detection Algorithm in Motion Image Sequence
Ranran Zhang · Jisuanji gongcheng · 2013
Traditional blotch detection algorithms obtain higher correct detection rates by reducing the value of threshold.However,the corresponding higher number of false alarms affects the following correction results directly.To maximize the ratio between correct detections and false alarms,this paper proposes an improved blotch detector based on simplified rank-ordered difference.The improved detector can achieve the most appropriate threshold to the different blotch in a certain frame by introducing dual-steps adaptive multi-threshold.It uses employment of texture matching to avoid the possible deviation caused by motion vector estimation in the regions with blotches.Performance evaluation is taken to the image sequences with both real blotches and artificially corrupted ones separately.Experimental results indicate higher correct detection rates and fewer false alarms simultaneously.