スキャン画像の面内むらを補正

shading.cpp

/** \file shading.cpp
  * \author unot
  * \date 2013/08/08
  * */

#include <iostream>
#include <string>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

int main(int argc, char const *argv[])
{
	if(argc==1) {
		std::cout << "Usage: shading input_img" << std::endl;
		exit(0);
	}
	cv::Mat src_img = cv::imread(argv[1]);
	if(src_img.empty()) {
		std::cerr << "Image Load Failed!" << std::endl;
		return -1;
	}
	static const std::string fileName_ext = argv[1];
	static std::string fileName(fileName_ext, 0, fileName_ext.size()-4);
	static const std::string empty_string;
	static std::ostringstream os;

	cv::Mat blurred, divided;
	cv::GaussianBlur(src_img, blurred, cv::Size(), 60, 0);
	// cv::imwrite("blurred.jpg", blurred);
	src_img.convertTo(src_img, CV_32F);
	blurred.convertTo(blurred, CV_32F);
	divided = src_img * 255.0 / blurred;
	divided.convertTo(divided, CV_8U);
	cv::normalize(divided, divided, 0, 255, cv::NORM_MINMAX);
	cv::erode(divided, divided, cv::Mat(), cv::Point(-1,-1), 1);
	os << fileName << "_shaded.jpg";
	cv::imwrite(os.str(), divided);
	return 0;
}