## bwlabel函数的C语言实现及用法解析

bwlabel函数的C语言实现及用法解析

bwlabel函数的C语言实现及用法解析

bwlabel函数的实现原理是通过扫描二值图像，并为每个连通区域分配一个唯一的标签。其中，连通区域是指由相邻的像素组成的一片区域，相邻的像素可以是相邻的8个像素或4个像素。以下是bwlabel函数的C语言实现：

void bwlabel(unsigned char *image, int *labelImage, int width, int height) {

int label = 1;

int labels[width * height];

memset(labels, 0, width * height * sizeof(int));

for (int i = 0; i < height; i++) {

for (int j = 0; j < width; j++) {

int index = i * width + j;

if (image[index] == 255) {

if (j > 0 && labels[index - 1] != 0) {

labelImage[index] = labels[index - 1];

} else if (i > 0 && labels[index - width] != 0) {

labelImage[index] = labels[index - width];

} else {

labelImage[index] = label;

labels[index] = label;

label++;

}

}

}

}

for (int i = 0; i < height; i++) {

for (int j = 0; j < width; j++) {

int index = i * width + j;

if (labelImage[index] != 0) {

labelImage[index] = labels[labelImage[index]];

}

}

}

}

int main() {

unsigned char image[10][10] = {

{255, 255, 0, 0, 0, 0, 0, 255, 255, 0},

{255, 0, 0, 0, 0, 0, 0, 0, 255, 0},

{0, 0, 0, 0, 0, 0, 0, 0, 255, 0},

{0, 0, 0, 255, 0, 0, 0, 255, 255, 0},

{0, 255, 255, 255, 255, 0, 0, 0, 0, 0},

{0, 0, 0, 255, 0, 0, 0, 0, 0, 0},

{0, 0, 0, 0, 0, 0, 255, 0, 0, 0},

{0, 0, 0, 0, 0, 0, 255, 0, 0, 0},

{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},

{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}

};

int labelImage[10][10];

bwlabel((unsigned char *)image, (int *)labelImage, 10, 10);

for (int i = 0; i < 10; i++) {

for (int j = 0; j < 10; j++) {

printf(\d \ labelImage[i][j]);

}

printf(\n\ }

return 0;

}