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/********************************************************
Author: Vinay
Function: h = ftrans2(b, t)
********************************************************/
#include <numeric>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/opencv.hpp"
#include <iostream>
#include <cmath>
using namespace cv;
using namespace std;
void rotate180(Mat &m) {
double temp;
for (int i=0; i<(m.rows+1)/2; i++) {
int k = m.cols;
if ((i+1)>=((m.rows+1)/2) && m.rows%2!=0) {
k = (m.cols+1)/2;
}
for (int j=0; j<k; j++) {
temp = m.at<double>(i, j);
m.at<double>(i, j) = m.at<double>(m.rows-i-1, m.cols-j-1);
m.at<double>(m.rows-i-1, m.cols-j-1) = temp;
}
}
}
Mat fftshift(Mat m) {
int a = m.rows/2;
int b = m.cols/2;
Mat r = Mat::zeros(m.size(), m.type());
for (int i=0; i<m.rows; i++) {
for (int j=0; j<m.cols; j++) {
r.at<double>((i+a)%m.rows, (j+b)%m.cols) = m.at<double>(i, j);
}
}
return r;
}
extern "C"
{
#include "api_scilab.h"
#include "Scierror.h"
#include "BOOL.h"
#include <localization.h>
#include "sciprint.h"
#include "../common.h"
int opencv_ftrans2(char *fname, unsigned long fname_len)
{
SciErr sciErr;
int intErr = 0;
int iRows=0,iCols=0;
int cRows=0,cCols=0;
int *piAddr = NULL;
int *piAddrNew = NULL;
//checking input argument
CheckInputArgument(pvApiCtx, 1, 2);
CheckOutputArgument(pvApiCtx, 1, 1) ;
Mat b, bcpy, t;
Mat P0, P1, P2, h, hh;
retrieveImage(bcpy, 1);
bcpy.convertTo(b, CV_64F);
if (b.cols == 1) {
transpose(b, b);
}
else if (b.rows == 1) {
}
else {
sciprint("b at argument 1 expected to be vector");
return 0;
}
if (b.cols%2 == 0) {
sciprint("b at argument 1 must be of odd length");
return 0;
}
Mat c = b.clone();
rotate180(c);
int zeroCount = 0;
double eps = 1.5e-5;
for (int i=0; i<b.cols; i++) {
if (abs(b.at<double>(0, i) - c.at<double>(0, i)) > eps) {
zeroCount = b.cols;
break;
}
if (b.at<double>(0, i) == 0) {
zeroCount++;
}
}
if (zeroCount == b.cols) {
sciprint("b at argument 1 must be nonzero and symmetric");
return 0;
}
if (nbInputArgument(pvApiCtx) == 2) {
Mat tcpy;
retrieveImage(tcpy, 2);
tcpy.convertTo(t, CV_64F);
}
else {
Mat tcpy;
double data[3][3] = {{1.0/8, 2.0/8, 1.0/8},{2.0/8, -4.0/8, 2.0/8},{1.0/8, 2.0/8, 1.0/8}};
tcpy = Mat(3, 3, CV_64F, &data);
t = tcpy.clone();
}
rotate180(b);
fftshift(b).copyTo(b);
rotate180(b);
int inset1 = (t.rows-1)/2;
int inset2 = (t.cols-1)/2;
int n = (b.cols-1)/2;
Mat a = Mat::zeros(1, n+1, CV_64F);
a.at<double>(0, 0) = b.at<double>(0,0);
for (int i=1; i<=n; i++) {
a.at<double>(0, i) = 2*b.at<double>(0, i);
}
P0 = Mat::ones(1, 1, CV_64F);
t.copyTo(P1);
h = (P1*a.at<double>(0, 1));
h.at<double>(inset1,inset2) = h.at<double>(inset1,inset2) + a.at<double>(0, 0);
for (int i=2; i<=n; i++) {
Mat src = t.clone();
int additionalRows = P1.rows-1, additionalCols = P1.cols-1;
copyMakeBorder(src, src, (additionalRows+1)/2, additionalRows/2, (additionalCols+1)/2, additionalCols/2, BORDER_CONSTANT, Scalar(0));
Point anchor(P1.cols - P1.cols/2 - 1, P1.rows - P1.rows/2 - 1);
int borderMode = BORDER_CONSTANT;
Mat P11;
flip(P1, P11,-1);
filter2D(src, P2, src.depth(), P11, anchor, 0, borderMode);
P2 = P2 * 2;
for (int x=0; x<P0.rows; x++) {
for (int y=0; y<P0.cols; y++) {
P2.at<double>(x + 2*inset1, y+ 2*inset2) = P2.at<double>(x + 2*inset1, y+ 2*inset2) - P0.at<double>(x, y);
}
}
h.copyTo(hh);
h = (P2*a.at<double>(0, i));
for (int x=0; x<P1.rows; x++) {
for (int y=0; y<P1.cols; y++) {
h.at<double>(x + inset1, y + inset2) = h.at<double>(x + inset1, y + inset2) + hh.at<double>(x, y);
}
}
P1.copyTo(P0);
P2.copyTo(P1);
}
rotate180(h);
Mat hcopy;
h.copyTo(hcopy);
string tempstring = type2str(hcopy.type());
char *imtype;
imtype = (char *)malloc(tempstring.size() + 1);
memcpy(imtype, tempstring.c_str(), tempstring.size() + 1);
returnImage(imtype,hcopy,1);
free(imtype);
AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1;
//Returning the Output Variables as arguments to the Scilab environment
ReturnArguments(pvApiCtx);
return 0;
}
/* ==================================================================== */
}
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