【opencv练习18 - 基本阈值操作】

/*****************************************************
测试程序 【基本阈值操作】
时间：2016年8月26日
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/// Global variables

int threshold_value = 0;        //阈值变量
int threshold_type = 3;         //阈值类型
int const max_value = 255;      //像素最大值
int const max_type = 4;         //最大类型编号
int const max_BINARY_value = 255;   //二值化最大值

Mat src, src_gray, dst;

const char* window_name = "Threshold Demo";
const char* trackbar_type = "Type: \n 0: Binary \n 1: Binary Inverted \n 2: Truncate \n 3: To Zero \n 4: To Zero Inverted";
const char* trackbar_value = "Value";

/// Function headers
void Threshold_Demo( int, void* );

int main(void)
{
/// Load an image
src = imread("YY01.jpg" , 1 );

/// Convert the image to Gray
cvtColor( src, src_gray, COLOR_RGB2GRAY );

/// Create a window to display results
namedWindow( window_name, WINDOW_AUTOSIZE );

/// Create Trackbar to choose type of Threshold
createTrackbar( trackbar_type,
window_name, &threshold_type,
max_type, Threshold_Demo );

createTrackbar( trackbar_value,
window_name, &threshold_value,
max_value, Threshold_Demo );

/// Call the function to initialize
Threshold_Demo( 0, 0 );

/// Wait until user finishes program
for(;;)
{
int c;
c = waitKey( 20 );
if( (char)c == 27 ){ break; }
}

}

//【回调函数】
void Threshold_Demo( int, void* )
{
//   0: Binary                //二值化
//   1: Binary Inverted       //反向二值化
//   2: Threshold Truncated   //超阈值截断
//   3: Threshold to Zero             //低于阈值，置0
//   4: Threshold to Zero Inverted    //高于阈值，置0

//参数，sec，dst，阈值，最大阈值（二值常用），阈值类型
threshold( src_gray, dst, threshold_value, max_BINARY_value,threshold_type );

imshow( window_name, dst );
}