AutomaticWhiteBalanceMethod.cpp · 杨慧强/Image-processing-algorithm

代码拉取完成,页面将自动刷新

扫描微信二维码支付

取消

支付完成

richgiteeai

Watch

不关注关注所有动态仅关注版本发行动态关注但不提醒动态

1 Star 0 Fork 0

杨慧强/Image-processing-algorithm

代码 Issues 0 Pull Requests 0 Wiki 统计流水线

服务

加入 Gitee

与超过 1400万开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)

免费加入

已有帐号? 立即登录

文件

master

分支 (1)

管理

master

该仓库未声明开源许可证文件(LICENSE),使用请关注具体项目描述及其代码上游依赖。

项目仓库所选许可证以仓库主分支所使用许可证为准

克隆/下载

HTTPS SSH SVN SVN+SSH 下载ZIP

提示

下载代码请复制以下命令到终端执行

为确保你提交的代码身份被 Gitee 正确识别,请执行以下命令完成配置

git config --global user.name userName 
git config --global user.email userEmail

初次使用 SSH 协议进行代码克隆、推送等操作时,需按下述提示完成 SSH 配置

1 生成 RSA 密钥

2 获取 RSA 公钥内容,并配置到 SSH公钥中

在 Gitee 上使用 SVN,请访问使用指南

使用 HTTPS 协议时,命令行会出现如下账号密码验证步骤。基于安全考虑,Gitee 建议配置并使用私人令牌替代登录密码进行克隆、推送等操作

Username for 'https://gitee.com': userName

Password for 'https://userName@gitee.com': # 私人令牌

分支 1

标签 0

Image-processing-algorithm

AutomaticWhiteBalanceMethod.cpp

AutomaticWhiteBalanceMethod.cpp 6.24 KB

const float YCbCrYRF = 0.299F; // RGB转YCbCr的系数(浮点类型)
const float YCbCrYGF = 0.587F;
const float YCbCrYBF = 0.114F;
const float YCbCrCbRF = -0.168736F;
const float YCbCrCbGF = -0.331264F;
const float YCbCrCbBF = 0.500000F;
const float YCbCrCrRF = 0.500000F;
const float YCbCrCrGF = -0.418688F;
const float YCbCrCrBF = -0.081312F;

const float RGBRYF = 1.00000F; // YCbCr转RGB的系数(浮点类型)
const float RGBRCbF = 0.0000F;
const float RGBRCrF = 1.40200F;
const float RGBGYF = 1.00000F;
const float RGBGCbF = -0.34414F;
const float RGBGCrF = -0.71414F;
const float RGBBYF = 1.00000F;
const float RGBBCbF = 1.77200F;
const float RGBBCrF = 0.00000F;

const int Shift = 20;
const int HalfShiftValue = 1 << (Shift - 1);

const int YCbCrYRI = (int)(YCbCrYRF * (1 << Shift) + 0.5); // RGB转YCbCr的系数(整数类型)
const int YCbCrYGI = (int)(YCbCrYGF * (1 << Shift) + 0.5);
const int YCbCrYBI = (int)(YCbCrYBF * (1 << Shift) + 0.5);
const int YCbCrCbRI = (int)(YCbCrCbRF * (1 << Shift) + 0.5);
const int YCbCrCbGI = (int)(YCbCrCbGF * (1 << Shift) + 0.5);
const int YCbCrCbBI = (int)(YCbCrCbBF * (1 << Shift) + 0.5);
const int YCbCrCrRI = (int)(YCbCrCrRF * (1 << Shift) + 0.5);
const int YCbCrCrGI = (int)(YCbCrCrGF * (1 << Shift) + 0.5);
const int YCbCrCrBI = (int)(YCbCrCrBF * (1 << Shift) + 0.5);

const int RGBRYI = (int)(RGBRYF * (1 << Shift) + 0.5); // YCbCr转RGB的系数(整数类型)
const int RGBRCbI = (int)(RGBRCbF * (1 << Shift) + 0.5);
const int RGBRCrI = (int)(RGBRCrF * (1 << Shift) + 0.5);
const int RGBGYI = (int)(RGBGYF * (1 << Shift) + 0.5);
const int RGBGCbI = (int)(RGBGCbF * (1 << Shift) + 0.5);
const int RGBGCrI = (int)(RGBGCrF * (1 << Shift) + 0.5);
const int RGBBYI = (int)(RGBBYF * (1 << Shift) + 0.5);
const int RGBBCbI = (int)(RGBBCbF * (1 << Shift) + 0.5);
const int RGBBCrI = (int)(RGBBCrF * (1 << Shift) + 0.5);

Mat RGB2YCbCr(Mat src) {
	int row = src.rows;
	int col = src.cols;
	Mat dst(row, col, CV_8UC3);
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			int Blue = src.at<Vec3b>(i, j)[0];
			int Green = src.at<Vec3b>(i, j)[1];
			int Red = src.at<Vec3b>(i, j)[2];
			dst.at<Vec3b>(i, j)[0] = (int)((YCbCrYRI * Red + YCbCrYGI * Green + YCbCrYBI * Blue + HalfShiftValue) >> Shift);
			dst.at<Vec3b>(i, j)[1] = (int)(128 + ((YCbCrCbRI * Red + YCbCrCbGI * Green + YCbCrCbBI * Blue + HalfShiftValue) >> Shift));
			dst.at<Vec3b>(i, j)[2] = (int)(128 + ((YCbCrCrRI * Red + YCbCrCrGI * Green + YCbCrCrBI * Blue + HalfShiftValue) >> Shift));
		}
	}
	return dst;
}

Mat YCbCr2RGB(Mat src) {
	int row = src.rows;
	int col = src.cols;
	Mat dst(row, col, CV_8UC3);
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			int Y = src.at<Vec3b>(i, j)[0];
			int Cb = src.at<Vec3b>(i, j)[1] - 128;
			int Cr = src.at<Vec3b>(i, j)[2] - 128;
			int Red = Y + ((RGBRCrI * Cr + HalfShiftValue) >> Shift);
			int Green = Y + ((RGBGCbI * Cb + RGBGCrI * Cr + HalfShiftValue) >> Shift);
			int Blue = Y + ((RGBBCbI * Cb + HalfShiftValue) >> Shift);
			if (Red > 255) Red = 255; else if (Red < 0) Red = 0;
			if (Green > 255) Green = 255; else if (Green < 0) Green = 0; // 编译后应该比三目运算符的效率高
			if (Blue > 255) Blue = 255; else if (Blue < 0) Blue = 0;
			dst.at<Vec3b>(i, j)[0] = Blue;
			dst.at<Vec3b>(i, j)[1] = Green;
			dst.at<Vec3b>(i, j)[2] = Red;
		}
	}
	return dst;
}

Mat AutomaticWhiteBalanceMethod(Mat src) {
	int row = src.rows;
	int col = src.cols;
	if (src.channels() == 4) {
		cvtColor(src, src, CV_BGRA2BGR);
	}
	Mat input = RGB2YCbCr(src);
	Mat mark(row, col, CV_8UC1);
	int sum = 0;
	for (int i = 0; i < row; i+=100) {
		for (int j = 0; j < col; j+=100) {
			if (i + 100 < row && j + 100 < col) {
				Rect rect(j, i, 100, 100);
				Mat temp = input(rect);
				Scalar global_mean = mean(temp);
				double dr = 0, db = 0;
				for (int x = 0; x < 100; x++) {
					uchar *ptr = temp.ptr<uchar>(x) + 1;
					for (int y = 0; y < 100; y++) {
						dr += pow(abs(*ptr - global_mean[1]), 2);
						ptr++;
						db += pow(abs(*ptr - global_mean[2]), 2);
						ptr++;
						ptr++;
					}
				}
				dr /= 10000;
				db /= 10000;
				double cr_left_criteria = 1.5 * global_mean[1] + dr * global_mean[1];
				double cr_right_criteria = 1.5 * dr;
				double cb_left_criteria = global_mean[2] + db * global_mean[2];
				double cb_right_criteria = 1.5 * db;
				for (int x = 0; x < 100; x++) {
					uchar *ptr = temp.ptr<uchar>(x) + 1;
					for (int y = 0; y < 100; y++) {
						uchar cr = *ptr;
						ptr++;
						uchar cb = *ptr;
						ptr++;
						ptr++;
						if ((cr - cb_left_criteria) < cb_right_criteria && (cb - cr_left_criteria) < cr_right_criteria) {
							sum++;
							mark.at<uchar>(i + x, j + y) = 1;
						}
						else {
							mark.at<uchar>(i + x, j + y) = 0;
						}
					}
				}
			}
		}
	}

int Threshold = 0;
	int Ymax = 0;
	int Light[256] = { 0 };
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			if (mark.at<uchar>(i, j) == 1) {
				Light[(int)(input.at<Vec3b>(i, j)[0])]++;
			}
			Ymax = max(Ymax, (int)(input.at<Vec3b>(i, j)[0]));
		}
	}
	printf("maxY: %d\n", Ymax);
	int sum2 = 0;
	for (int i = 255; i >= 0; i--) {
		sum2 += Light[i];
		if (sum2 >= sum * 0.1) {
			Threshold = i;
			break;
		}
	}
	printf("Threshold: %d\n", Threshold);
	printf("Sum: %d Sum2: %d\n", sum, sum2);
	double Blue = 0;
	double Green = 0;
	double Red = 0;
	int cnt2 = 0;
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			if (mark.at<uchar>(i, j) == 1 && (int)(input.at<Vec3b>(i, j)[0]) >= Threshold) {
				Blue += 1.0 * src.at<Vec3b>(i, j)[0];
				Green += 1.0 * src.at<Vec3b>(i, j)[1];
				Red += 1.0 * src.at<Vec3b>(i, j)[2];
				cnt2++;
			}
		}
	}
	Blue /= cnt2;
	Green /= cnt2;
	Red /= cnt2;
	printf("%.5f %.5f %.5f\n", Blue, Green, Red);
	Mat dst(row, col, CV_8UC3);
	double maxY = Ymax;
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			int B = (int)(maxY * src.at<Vec3b>(i, j)[0] / Blue);
			int G = (int)(maxY * src.at<Vec3b>(i, j)[1] / Green);
			int R = (int)(maxY * src.at<Vec3b>(i, j)[2] / Red);
			if (B > 255) B = 255; else if (B < 0) B = 0;
			if (G > 255) G = 255; else if (G < 0) G = 0;
			if (R > 255) R = 255; else if (R < 0) R = 0;
			dst.at<Vec3b>(i, j)[0] = B;
			dst.at<Vec3b>(i, j)[1] = G;
			dst.at<Vec3b>(i, j)[2] = R;
		}
	}
	return dst;
}

一键复制编辑原始数据按行查看历史

BBuf 提交于 2019年04月10日 15:19 +08:00 . Add AutomaticWhiteBalanceMethod.cpp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193

const float YCbCrYRF = 0.299F; // RGB转YCbCr的系数(浮点类型)
const float YCbCrYGF = 0.587F;
const float YCbCrYBF = 0.114F;
const float YCbCrCbRF = -0.168736F;
const float YCbCrCbGF = -0.331264F;
const float YCbCrCbBF = 0.500000F;
const float YCbCrCrRF = 0.500000F;
const float YCbCrCrGF = -0.418688F;
const float YCbCrCrBF = -0.081312F;

const float RGBRYF = 1.00000F; // YCbCr转RGB的系数(浮点类型)
const float RGBRCbF = 0.0000F;
const float RGBRCrF = 1.40200F;
const float RGBGYF = 1.00000F;
const float RGBGCbF = -0.34414F;
const float RGBGCrF = -0.71414F;
const float RGBBYF = 1.00000F;
const float RGBBCbF = 1.77200F;
const float RGBBCrF = 0.00000F;

const int Shift = 20;
const int HalfShiftValue = 1 << (Shift - 1);

const int YCbCrYRI = (int)(YCbCrYRF * (1 << Shift) + 0.5); // RGB转YCbCr的系数(整数类型)
const int YCbCrYGI = (int)(YCbCrYGF * (1 << Shift) + 0.5);
const int YCbCrYBI = (int)(YCbCrYBF * (1 << Shift) + 0.5);
const int YCbCrCbRI = (int)(YCbCrCbRF * (1 << Shift) + 0.5);
const int YCbCrCbGI = (int)(YCbCrCbGF * (1 << Shift) + 0.5);
const int YCbCrCbBI = (int)(YCbCrCbBF * (1 << Shift) + 0.5);
const int YCbCrCrRI = (int)(YCbCrCrRF * (1 << Shift) + 0.5);
const int YCbCrCrGI = (int)(YCbCrCrGF * (1 << Shift) + 0.5);
const int YCbCrCrBI = (int)(YCbCrCrBF * (1 << Shift) + 0.5);

const int RGBRYI = (int)(RGBRYF * (1 << Shift) + 0.5); // YCbCr转RGB的系数(整数类型)
const int RGBRCbI = (int)(RGBRCbF * (1 << Shift) + 0.5);
const int RGBRCrI = (int)(RGBRCrF * (1 << Shift) + 0.5);
const int RGBGYI = (int)(RGBGYF * (1 << Shift) + 0.5);
const int RGBGCbI = (int)(RGBGCbF * (1 << Shift) + 0.5);
const int RGBGCrI = (int)(RGBGCrF * (1 << Shift) + 0.5);
const int RGBBYI = (int)(RGBBYF * (1 << Shift) + 0.5);
const int RGBBCbI = (int)(RGBBCbF * (1 << Shift) + 0.5);
const int RGBBCrI = (int)(RGBBCrF * (1 << Shift) + 0.5);

Mat RGB2YCbCr(Mat src) {
	int row = src.rows;
	int col = src.cols;
	Mat dst(row, col, CV_8UC3);
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			int Blue = src.at<Vec3b>(i, j)[0];
			int Green = src.at<Vec3b>(i, j)[1];
			int Red = src.at<Vec3b>(i, j)[2];
			dst.at<Vec3b>(i, j)[0] = (int)((YCbCrYRI * Red + YCbCrYGI * Green + YCbCrYBI * Blue + HalfShiftValue) >> Shift);
			dst.at<Vec3b>(i, j)[1] = (int)(128 + ((YCbCrCbRI * Red + YCbCrCbGI * Green + YCbCrCbBI * Blue + HalfShiftValue) >> Shift));
			dst.at<Vec3b>(i, j)[2] = (int)(128 + ((YCbCrCrRI * Red + YCbCrCrGI * Green + YCbCrCrBI * Blue + HalfShiftValue) >> Shift));
		}
	}
	return dst;
}

Mat YCbCr2RGB(Mat src) {
	int row = src.rows;
	int col = src.cols;
	Mat dst(row, col, CV_8UC3);
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			int Y = src.at<Vec3b>(i, j)[0];
			int Cb = src.at<Vec3b>(i, j)[1] - 128;
			int Cr = src.at<Vec3b>(i, j)[2] - 128;
			int Red = Y + ((RGBRCrI * Cr + HalfShiftValue) >> Shift);
			int Green = Y + ((RGBGCbI * Cb + RGBGCrI * Cr + HalfShiftValue) >> Shift);
			int Blue = Y + ((RGBBCbI * Cb + HalfShiftValue) >> Shift);
			if (Red > 255) Red = 255; else if (Red < 0) Red = 0;
			if (Green > 255) Green = 255; else if (Green < 0) Green = 0; // 编译后应该比三目运算符的效率高
			if (Blue > 255) Blue = 255; else if (Blue < 0) Blue = 0;
			dst.at<Vec3b>(i, j)[0] = Blue;
			dst.at<Vec3b>(i, j)[1] = Green;
			dst.at<Vec3b>(i, j)[2] = Red;
		}
	}
	return dst;
}

Mat AutomaticWhiteBalanceMethod(Mat src) {
	int row = src.rows;
	int col = src.cols;
	if (src.channels() == 4) {
		cvtColor(src, src, CV_BGRA2BGR);
	}
	Mat input = RGB2YCbCr(src);
	Mat mark(row, col, CV_8UC1);
	int sum = 0;
	for (int i = 0; i < row; i+=100) {
		for (int j = 0; j < col; j+=100) {
			if (i + 100 < row && j + 100 < col) {
				Rect rect(j, i, 100, 100);
				Mat temp = input(rect);
				Scalar global_mean = mean(temp);
				double dr = 0, db = 0;
				for (int x = 0; x < 100; x++) {
					uchar *ptr = temp.ptr<uchar>(x) + 1;
					for (int y = 0; y < 100; y++) {
						dr += pow(abs(*ptr - global_mean[1]), 2);
						ptr++;
						db += pow(abs(*ptr - global_mean[2]), 2);
						ptr++;
						ptr++;
					}
				}
				dr /= 10000;
				db /= 10000;
				double cr_left_criteria = 1.5 * global_mean[1] + dr * global_mean[1];
				double cr_right_criteria = 1.5 * dr;
				double cb_left_criteria = global_mean[2] + db * global_mean[2];
				double cb_right_criteria = 1.5 * db;
				for (int x = 0; x < 100; x++) {
					uchar *ptr = temp.ptr<uchar>(x) + 1;
					for (int y = 0; y < 100; y++) {
						uchar cr = *ptr;
						ptr++;
						uchar cb = *ptr;
						ptr++;
						ptr++;
						if ((cr - cb_left_criteria) < cb_right_criteria && (cb - cr_left_criteria) < cr_right_criteria) {
							sum++;
							mark.at<uchar>(i + x, j + y) = 1;
						}
						else {
							mark.at<uchar>(i + x, j + y) = 0;
						}
					}
				}
			}
		}
	}

	int Threshold = 0;
	int Ymax = 0;
	int Light[256] = { 0 };
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			if (mark.at<uchar>(i, j) == 1) {
				Light[(int)(input.at<Vec3b>(i, j)[0])]++;
			}
			Ymax = max(Ymax, (int)(input.at<Vec3b>(i, j)[0]));
		}
	}
	printf("maxY: %d\n", Ymax);
	int sum2 = 0;
	for (int i = 255; i >= 0; i--) {
		sum2 += Light[i];
		if (sum2 >= sum * 0.1) {
			Threshold = i;
			break;
		}
	}
	printf("Threshold: %d\n", Threshold);
	printf("Sum: %d Sum2: %d\n", sum, sum2);
	double Blue = 0;
	double Green = 0;
	double Red = 0;
	int cnt2 = 0;
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			if (mark.at<uchar>(i, j) == 1 && (int)(input.at<Vec3b>(i, j)[0]) >= Threshold) {
				Blue += 1.0 * src.at<Vec3b>(i, j)[0];
				Green += 1.0 * src.at<Vec3b>(i, j)[1];
				Red += 1.0 * src.at<Vec3b>(i, j)[2];
				cnt2++;
			}
		}
	}
	Blue /= cnt2;
	Green /= cnt2;
	Red /= cnt2;
	printf("%.5f %.5f %.5f\n", Blue, Green, Red);
	Mat dst(row, col, CV_8UC3);
	double maxY = Ymax;
	for (int i = 0; i < row; i++) {
		for (int j = 0; j < col; j++) {
			int B = (int)(maxY * src.at<Vec3b>(i, j)[0] / Blue);
			int G = (int)(maxY * src.at<Vec3b>(i, j)[1] / Green);
			int R = (int)(maxY * src.at<Vec3b>(i, j)[2] / Red);
			if (B > 255) B = 255; else if (B < 0) B = 0;
			if (G > 255) G = 255; else if (G < 0) G = 0;
			if (R > 255) R = 255; else if (R < 0) R = 0;
			dst.at<Vec3b>(i, j)[0] = B;
			dst.at<Vec3b>(i, j)[1] = G;
			dst.at<Vec3b>(i, j)[2] = R;
		}
	}
	return dst;
}