摘要
利用JPEG图像经篡改后块效应不一致的特性,提出一种根据JPEG篡改图像块效应值的分布检测篡改区域的方法。改进一种通过参照DCT系数的功率谱直方图估计量化表的方法,根据量化表求得图像每个8×8块的块效应,然后根据块效应值的分布规律检测出图像篡改区域。实验表明算法的应用范围广,具有一定的实践意义。
Using the inconsistencies of tampered JPEG images＇ blocking artifacts,this paper presents a method to detect tampered area of JPEG images based on the distribution of blocking artifacts values.The algorithm improved a method to estimate the quantization table based on the power spectrum histogram of DCT coefficients,and obtained blocking artifacts of each 8×8 block using the quantization table.Then tampered area can be detected according to the distribution of blocking artifacts values.Experiments show that this algorithm has wide applications and a certain practical significance.
出处
《计算机与数字工程》
2013年第2期291-293,共3页
Computer & Digital Engineering
关键词
图像篡改
块效应
量化表
tampered image
blocking artifacts
quantization table
