I didn't want to spam the source code here not knowing it wasn't allowed,
but here is the code I'm attempting to compile:
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <tesseract/baseapi.h>
#include <iostream>
void rgb2cmyk(cv::Mat& src, std::vector<cv::Mat>& cmyk)
{
CV_Assert(src.type() == CV_8UC3);
cmyk.clear();
for (int i = 0; i < 4; ++i)
cmyk.push_back(cv::Mat(src.size(), CV_32F));
for (int i = 0; i < src.rows; ++i)
{
for (int j = 0; j < src.cols; ++j)
{
cv::Vec3b p = src.at<cv::Vec3b>(i,j);
float r = p[2] / 255.;
float g = p[1] / 255.;
float b = p[0] / 255.;
float k = (1 - std::max(std::max(r,g),b));
cmyk[0].at<float>(i,j) = (1 - r - k) / (1 - k);
cmyk[1].at<float>(i,j) = (1 - g - k) / (1 - k);
cmyk[2].at<float>(i,j) = (1 - b - k) / (1 - k);
cmyk[3].at<float>(i,j) = k;
}
}
}
int main()
{
cv::Mat im0 = cv::imread("scratchcard.png");
if (!im0.data)
return -1;
std::vector<cv::Mat> cmyk;
rgb2cmyk(im0, cmyk);
cv::Mat im1;
im1 = cmyk[3].mul(1 - cmyk[1]) > 0.25;
cv::Mat im2;
im1.convertTo(im2, CV_8U);
std::vector<std::vector<cv::Point> > contours;
cv::findContours(im2, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);
double max_area = 0;
int max_idx = 0;
for (int i = 0; i < contours.size(); i++)
{
double area = cv::contourArea(contours[i]);
max_idx = area > max_area ? i : max_idx;
max_area = area > max_area ? area : max_area;
}
im2.setTo(cv::Scalar(0));
cv::drawContours(im2, contours, max_idx, cv::Scalar(255), -1);
cv::Mat im3;
cv::cvtColor(im0, im3, CV_BGR2GRAY);
im3 = ((255 - im3) & im2) > 200;
cv::Mat dst = im3.clone();
cv::findContours(dst.clone(), contours, CV_RETR_EXTERNAL,
CV_CHAIN_APPROX_NONE);
for (int i = 0; i < contours.size(); i++)
{
if (cv::contourArea(contours[i]) < 100)
cv::drawContours(dst, contours, i, cv::Scalar(0), -1);
}
tesseract::TessBaseAPI tess;
tess.Init(NULL, "eng", tesseract::OEM_DEFAULT);
tess.SetVariable("tessedit_char_whitelist", "0123456789");
tess.SetPageSegMode(tesseract::PSM_SINGLE_BLOCK);
tess.SetImage((uchar*)dst.data, dst.cols, dst.rows, 1, dst.cols);
char* out = tess.GetUTF8Text();
std::cout << out << std::endl;
cv::imshow("src", im0);
cv::imshow("dst", dst);
cv::waitKey();
return 0;
}
I included OpenCV and Tesseract as the example code instructed, but maybe
I'm missing one #include.
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