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/*
* imgaborfilt
*
* imgaborfilt in scilab
*
*/
// Created by Samiran Roy, mail: samiranroy@cse.iitb.ac.in
// An implementation of imgaborfilt in scilab
// Usage:
// imgaborfilt(I,wavelength,orientation) : Perform gabor filtering on a grayscale image with given wavelength and orientation
// imboxfilt(I,method)
// method : 'upright' (default)
// method : 'rotated' The area sums are calulated over a rectangle, which is
// rotated 45 degrees
// Known Changes from Matlab:
/*
* 1) None, as of now
*/
#include <numeric>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/opencv.hpp"
#include <iostream>
using namespace cv;
using namespace std;
extern "C" {
#include "api_scilab.h"
#include "Scierror.h"
#include "BOOL.h"
#include <localization.h>
#include "sciprint.h"
#include "../common.h"
int opencv_imgaborfilt(char *fname, unsigned long fname_len) {
SciErr sciErr;
int intErr = 0;
int iRows = 0, iCols = 0;
int *piAddr = NULL;
int *piAddr1 = NULL;
int *piAddr2 = NULL;
int *piAddr3 = NULL;
int error;
double wavelength;
double orientation;
int borderType = BORDER_REPLICATE;
// Parameters for convolution - Leave these alone
/* **********************************************************************************
*/
Point anchor;
double delta;
int ddepth;
anchor = Point(-1, -1); // The center is unchanged
delta = 0; // No value is added to output
ddepth = -1; // The dimentions of input and output images are the same
/* **********************************************************************************
*/
// Get the number of input arguments
int inputarg = *getNbInputArgument(pvApiCtx);
// String holding the second argument
int iRet = 0;
char *pstData = NULL;
// Checking input argument
CheckInputArgument(pvApiCtx, 3, 3);
CheckOutputArgument(pvApiCtx, 1, 1);
// Get input image
Mat image;
retrieveImage(image, 1);
if (image.channels() > 1) {
sciprint("The image must be grayscale.");
return 0;
}
// Getting the wavelength
sciErr = getVarAddressFromPosition(pvApiCtx, 2, &piAddr2);
if (sciErr.iErr) {
printError(&sciErr, 0);
return 0;
}
intErr = getScalarDouble(pvApiCtx, piAddr2, &wavelength);
if (sciErr.iErr) {
printError(&sciErr, 0);
return intErr;
}
if (wavelength < 2) {
sciprint("Wavelength must be >=2");
return 0;
}
// Getting the orientation
sciErr = getVarAddressFromPosition(pvApiCtx, 3, &piAddr3);
if (sciErr.iErr) {
printError(&sciErr, 0);
return 0;
}
intErr = getScalarDouble(pvApiCtx, piAddr3, &orientation);
if (sciErr.iErr) {
printError(&sciErr, 0);
return intErr;
}
if ((orientation < 0) || (orientation > 360)) {
sciprint("Orientation must be in the range [0,360]");
return 0;
}
double sigma = (1 / CV_PI) * sqrt(log(2) / 2) * 3 *
wavelength; // calculating sigma following matlab convention
orientation = (orientation / 360) * 2 * CV_PI; // Converting degree to radian
int K_size =
33 +
16 * (wavelength - 2); // size of kernel following matlab convention
Mat kernel = getGaborKernel(cv::Size(K_size, K_size), sigma, orientation,
wavelength, 0.5, 0);
Mat floatimage;
image.convertTo(floatimage, CV_32F); // Converting image to float type
Mat dst;
Mat new_image;
filter2D(floatimage, new_image, CV_32F, kernel); // Performing convolution
int temp = nbInputArgument(pvApiCtx) + 1;
string tempstring = type2str(new_image.type());
char *checker;
checker = (char *)malloc(tempstring.size() + 1);
memcpy(checker, tempstring.c_str(), tempstring.size() + 1);
returnImage(checker, new_image, 1);
free(checker);
// Assigning the list as the Output Variable
AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1;
// Returning the Output Variables as arguments to the Scilab environment
ReturnArguments(pvApiCtx);
return 0;
}
/* ==================================================================== */
}
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