An Edge Detection Method in DCT Domain
Zhenxing Qian, Wenwen Wang, Tong Qiao · Procedia Engineering · 2012
This paper proposes a new edge detection method in DCT domain for compressed images. Instead of detection with spatial pixels, we generate the gradient patterns of DCT basis images with detection operators. The quantized coefficients are used to calculate the edge maps, which avoids the procedure of inverse quantization. It is shown that the proposed scheme leads to not only good edges but also computation speedup.