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/*
* bwlookup
*
* 2*2 and 3*3 non linear filtering of a binary image based on a lookup table -
*lut which is taken as input from the user
*
*/
// Created by Samiran Roy, mail: samiranroy@cse.iitb.ac.in
// An implementation of bwlookup
// Usage:
// bwlookup(I,lut)
// I is the input binary grayscale image. If the image is not binary, it is
// converted to one.
// lut is a 1*16 double vector [2*2 filtering], or a [1*512] double vector [3*3
// filtering]
// The indexing method used is the same as Matlab bwlookup:
// http://in.mathworks.com/help/images/ref/bwlookup.html
// 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_bwlookup(char* fname, unsigned long fname_len) {
SciErr sciErr;
int intErr = 0;
int* piAddr = NULL;
// checking input argument
CheckInputArgument(pvApiCtx, 2, 2);
CheckOutputArgument(pvApiCtx, 1, 1);
// get input matrix
Mat image;
retrieveImage(image, 1);
if (image.channels() > 1) {
sciprint("The image must be grayscale.");
return -1;
}
double* lut;
int iRows = 0, iCols = 0;
sciErr = getVarAddressFromPosition(pvApiCtx, 2, &piAddr);
if (sciErr.iErr) {
printError(&sciErr, 0);
return -1;
}
sciErr = getMatrixOfDouble(pvApiCtx, piAddr, &iRows, &iCols, &lut);
if (sciErr.iErr) {
printError(&sciErr, 0);
return -1;
}
// Error Checking
if (!((iCols == 16) || (iCols == 512))) {
sciprint("Expected LUT (argument 2) to have 16 or 512 elements.\n");
return -1;
}
if (iRows != 1) {
sciprint("Expected input number 2, LUT, to be a vector.\n");
return -1;
}
if (image.channels() != 1) {
sciprint("Expected input number 1, A, to be two-dimensional.\n");
return -1;
}
// temporary copy of image to perform computation
// converting the image to a binary image
Mat tempimg = Mat::zeros(image.size(), CV_8U);
for (int i = 0; i < image.rows; i++) {
for (int j = 0; j < image.cols; j++) {
if (image.at<double>(i, j) != 0) tempimg.at<uchar>(i, j) = 1;
}
}
// pad the temporary copy of the image with zeroes to handle border cases
copyMakeBorder(tempimg, tempimg, 1, 1, 1, 1, BORDER_CONSTANT, 0);
// output images
Mat new_image = Mat::zeros(image.size(), CV_32F);
// temporary variables
int ii, jj;
int index;
// 2*2 filtering
if (iCols == 16) {
for (int i = 0; i < image.rows; i++) {
for (int j = 0; j < image.cols; j++) {
ii = i + 1;
jj = j + 1;
index = tempimg.at<uchar>(ii, jj) * 1 +
tempimg.at<uchar>(ii, jj + 1) * 2 +
tempimg.at<uchar>(ii + 1, jj) * 4 +
tempimg.at<uchar>(ii + 1, jj + 1) * 8;
new_image.at<float>(i, j) = lut[ 0, index ];
}
}
}
// 3*3 filtering
if (iCols == 512) {
for (int i = 0; i < image.rows; i++) {
for (int j = 0; j < image.cols; j++) {
ii = i + 1;
jj = j + 1;
index = tempimg.at<uchar>(ii - 1, jj - 1) * 1 +
tempimg.at<uchar>(ii - 1, jj) * 2 +
tempimg.at<uchar>(ii - 1, jj + 1) * 4 +
tempimg.at<uchar>(ii, jj - 1) * 8 +
tempimg.at<uchar>(ii, jj) * 16 +
tempimg.at<uchar>(ii, jj + 1) * 32 +
tempimg.at<uchar>(ii + 1, jj - 1) * 64 +
tempimg.at<uchar>(ii + 1, jj) * 128 +
tempimg.at<uchar>(ii + 1, jj + 1) * 256;
new_image.at<float>(i, j) = lut[ 0, index ];
}
}
}
// sciprint("\n");
// for (int i = 0; i < new_image.rows; i++) {
// for (int j = 0; j < new_image.cols; j++) {
// sciprint("%i ", new_image.at<uchar>(i,j));
// }
// sciprint("\n");
// }
// new_image is sent to scilab as output
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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