低频近似系数 low frequency approximate coefficient
Second, using the method of wavelet-transform, extract the stable second-low frequency wavelet coefficient, build face database.
2．利用小波变换的方法提取人脸图像相对稳定的二次小波低频系数，建立人脸库。
参考来源 - 人脸自动识别系统的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
通过图像块与相似块在DCT变换域少数低频系数的比较，来确定匹配的相似块。
This method compares the few low frequency DCT transform coefficients of the range blocks and domain blocks to find out the matched domain block.
根据局部梯度信息对源图像的小波低频系数进行选择，获取融合图像的对应低频系数。
According to local gradient information, wavelet low frequency coefficient obtained from source image is selected to compose respective low frequency coefficient of the fused image.
同时算法与视频压缩算法相结合，在DCT域的次低频系数中嵌入信息，提高其鲁棒性。
At the same time, the algorithm is combined with the video compressing standards, and embeds the information in the coefficient of the sub-low frequency in DCT domain, which improves the robustness.
应用推荐