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Hi, I have a problem with

and I don't know how to solve the problem. Please help me, thank you.

and I don't know how to solve the problem. Please help me, thank you.

and I don't know how to solve the problem. Please help me, thank you.

I having problem with this

void colortrackbar() {

    namedWindow("Color", CV_WINDOW_AUTOSIZE);
cvCreateTrackbar("Blue", "Color", 0, 1, bluecolor_callback);
cvCreateTrackbar("Green", "Color", 0, 1);
cvCreateTrackbar("Red", "Color", 0, 1);

}

void bluecolor_callback(int position) {

if (position == 0) {
    int H_MIN = 0;
    int H_MAX = 255;
    int S_MIN = 0;
    int S_MAX = 255;
    int V_MIN = 0;
    int V_MAX = 255;
}
else {
    int H_MIN = 0;
    int H_MAX = 255;
    int S_MIN = 110;
    int S_MAX = 255;
    int V_MIN = 148;
    int V_MAX = 255;
}

and having error

C2065 "bluecolor_callback" : undeclared identifier

and I don't know how to solve the problem. Please help me, thank you.

I having problem with this

void colortrackbar() {
 
{
 namedWindow("Color", CV_WINDOW_AUTOSIZE);
 cvCreateTrackbar("Blue", "Color", 0, 1, bluecolor_callback);
 cvCreateTrackbar("Green", "Color", 0, 1);
 cvCreateTrackbar("Red", "Color", 0, 1);
 
}
 
}
void bluecolor_callback(int position) {
 
{
if (position == 0) {
 int H_MIN = 0;
 int H_MAX = 255;
 int S_MIN = 0;
 int S_MAX = 255;
 int V_MIN = 0;
 int V_MAX = 255;
 }
 else {
 int H_MIN = 0;
 int H_MAX = 255;
 int S_MIN = 110;
 int S_MAX = 255;
 int V_MIN = 148;
 int V_MAX = 255;
 }
 
and having error
 
C2065 "bluecolor_callback" : undeclared identifier
identifier
 
and I don't know how to solve the problem. Please help me, thank you.