区块效应(blocking artifacts)是采用以区块为单位的动作补偿与区块转换，在失真 压缩时所造成的边界不連续现象，它也是目前主流的视讯编码标准，在低码率时
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Secondly,blocking artifacts factor map is extracted via computing the distortion caused by recompression. Finally,automatic detection and location of tampered region is realized by using image segmentation.
首先利用估计的一次压缩质量因子对待检测图像进行裁剪再压缩,然后通过计算压缩前后的失真提取图像的块效应指数映射图,最后采用图像分割的方法实现篡改区域的自动检测与定位。
参考来源 - 针对一类JPEG图像伪造的被动盲取证·2,447,543篇论文数据，部分数据来源于NoteExpress
Experimental results have demonstrated the effectiveness of the proposed method in reducing blocking artifacts and improving the subjective quality of video frames.
实验结果表明该方法能够有效降低方块效应，改善视频帧的主观质量。
So they adopt a filter in motion-compensation loop as a post-processing to remove blocking artifacts.
所以在这两款标准中都采用环路滤波作为后处理技术来去除块效应。
At low bit rates, the block Discrete Cosine Transform (BDCT) compression methods often give rise to blocking artifacts.
低比特率时，基于块离散余弦变换(BDCT)的图像压缩方法常常会引起块效应。
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