我正試圖在頻域中執行逆濾波和僞逆濾波。對OpenCV進行逆濾波 - 訪問DFT值並乘以DFT矩陣
但是我有麻煩訪問DFT係數,之後乘以DFT矩陣,因爲我得到複數,因此,實際上是兩個矩陣...
基本上逆濾波執行
F = G/H,
其中F是恢復的圖像,G是模糊圖像,H是模糊圖像的內核。
僞逆需要訪問H中的值,因爲如果值接近0,它應該被替換以避免恢復中的問題。爲此,我們必須改變爲H,使得:
H(U,V)= 1/H(U,V)如果H(U,V)>閾 和= 0否則
我有一個kernel1(h_1)以及imf(恢復)和img(模糊)圖像。下面是代碼:
// compute the DFTs of the kernel (DFT_B) and the blurred image (DBF_A)
cvDFT(dft_A, dft_A, CV_DXT_FORWARD, complexInput1->height);
cvDFT(dft_B, dft_B, CV_DXT_FORWARD, complexInput2->height);
// the first type is the inverse fitlering
if (type == 1) {
printf("...performing inverse filtering\n");
// dividing the transforms
cvDiv(dft_A, dft_B, dft_C, 1);
}
// the second type is the pseudo-inverse filtering
else {
printf("...prepare kernel for pseudo-inverse filtering\n");
// will try to access the real values in order to see if value is above a threshold
cvSplit(dft_B, image_Re1, image_Im1, 0, 0);
// pointers to access the data into the real and imaginary matrices
uchar * dRe1 = (uchar *)image_Re1->imageData;
uchar * dIm1 = (uchar *)image_Im1->imageData;
int width = image_Re1->width;
int height = image_Re1->height;
int step = image_Re1->widthStep;
image_Re2 = cvCreateImage(cvGetSize(image_Re1), IPL_DEPTH_32F, 1);
image_Im2 = cvCreateImage(cvGetSize(image_Im2), IPL_DEPTH_32F, 1);
// pointers to access the data into the real and imaginary matrices
// it will be the resulting pseudo-inverse filter
uchar * dRe2 = (uchar *)image_Re2->imageData;
uchar * dIm2 = (uchar *)image_Im2->imageData;
printf("...building kernel for pseudo-inverse filtering\n");
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
// generate the 1/H(i,j) value
if (dRe1[i * step + j] > threshold) {
float realsq = dRe1[i * step + j]*dRe1[i * step + j];
float imagsq = dIm1[i * step + j]*dIm1[i * step + j];
dRe2[i * step + j] = dRe1[i * step + j]/(realsq + imagsq);
dIm2[i * step + j] = -1 * (dIm1[i * step + j]/(realsq + imagsq));
}
else {
dRe2[i * step + j] = 0;
dIm2[i * step + j] = 0;
}
}
}
printf("...merging final kernel\n");
cvMerge(image_Re2, image_Im2, 0, 0, dft_B);
printf("...performing pseudo-inverse filtering\n");
cvMulSpectrums(dft_A, dft_B, dft_C, 1);
}
printf("...performing IDFT\n");
cvDFT(dft_C, dft_H, CV_DXT_INV_SCALE, 1);
printf("...getting size\n");
cvGetSubRect(dft_H, &tmp3, cvRect(0, 0, img->width, img->height));
printf("......(%d, %d) - (%d, %d)\n", tmp3.cols, tmp3.rows, restored->width, restored->height);
cvSplit(&tmp3, image_Re1, image_Im1, 0, 0);
cvNamedWindow("re", 0);
cvShowImage("re", image_Re2);
cvWaitKey(0);
printf("...copying final image\n");
// error is in the line below
cvCopy(image_Re1, imf, NULL);
我對最後一行的錯誤:--- OpenCV的錯誤:斷言失敗(src.depth()== dst.depth()& & src.size()= = dst.size())在cvCopy中,文件/build/buildd/opencv-2.1.0/src/cxcore/cxcopy.cpp,行466
我知道它與尺寸或深度有關,但我不知道不知道如何控制。無論如何,我試圖顯示image_Re1,它是空的...
任何人都可以闡明它嗎?
免費試用圖像空間和上面的代碼減少到仍表現出該問題的小例子 - 你更容易得到答案的方式。 –
謝謝。我會盡力。 –