A deblocking method for BDCT compressed images based on adaptive projections

A deblocking method based on projection onto convex sets (POCS) is proposed to reduce blocking artifacts in compressed images coded by the block discrete cosine transform. The method differs from existing POCS-based methods in three aspects. Firstly, the adjustment of a pixel's intensity is determined by local properties of the pixel. Secondly, three locally adaptive constraint sets are introduced to improve deblocking results. Thirdly, the human visual system modeling and relaxed projections are incorporated to make pixels adjust appropriately. The method is tested on typical images with excellent results.

提出了一种基于凸集投影（POCS）的去块方法，以减少由块离散余弦变换编码的压缩图像中的块效应。该方法在三个方面不同于现有的基于凸集投影的方法。首先，像素强度的调整由像素的局部特性决定。其次，引入了三个局部自适应约束集以改善去块效果。第三，结合人类视觉系统建模和松弛投影使像素能够适当调整。该方法在典型图像上进行了测试，结果良好。