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C++でRaw画像を読み込んで、そのまま出力する

Last updated at Posted at 2022-08-18

取り組んだこと

C++でRaw画像を読み込んで、そのまま出力することに取り組んだ。
勉強のためにスマートポインタも使ってみた。

コード

main.cpp
#include <iostream>
#include <string>
#include <fstream>


#define X_SIZE 768
#define Y_SIZE 576
#define CH 3

std::string input_name = "dog.raw";
std::string output_name = "dog_out.raw";


int main(void) {
	
	std::unique_ptr<unsigned char[]> input_image=std::make_unique<unsigned char[]>(X_SIZE * Y_SIZE * CH);
	std::unique_ptr<unsigned char[]> output_image=std::make_unique<unsigned char[]>(X_SIZE * Y_SIZE * CH);

	// 画像読み込み
	std::ifstream fin(input_name.c_str(), std::ios::in | std::ios::binary );

	if (!fin){
		std::cout << "ファイル が開けません"<<std::endl;
		return 1;
    }

	fin.read(reinterpret_cast<char*>(input_image.get()), X_SIZE * Y_SIZE * CH);

	// 画像書き込み
	for (int y = 0; y < Y_SIZE; y++) {
		for (int x = 0; x < X_SIZE; x++) {
			for (int ch = 0; ch < CH; ch++) {
				output_image[(y*X_SIZE + x)*CH + ch] = input_image[(y*X_SIZE + x)*CH + ch];
			}
		}
	}

    std::ofstream fout;
    fout.open(output_name.c_str(), std::ios::out|std::ios::binary);

	fout.write(reinterpret_cast<char*>(output_image.get()), X_SIZE * Y_SIZE * CH);


	fin.close();
	fout.close();

	return 0;
}

使用画像

以下の画像をimage JでRawに直したもの。
dog.jpg

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