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sorry probably it's a stupid question :) it's possible to apply a homography to the coordinates of a point?

for example in his code:

double X;
double Y;
std::vector<KeyPoint> key_filtered;
for( int i=0; i<(int)keypoints.size(); i++)
{
        double x = keypoints[i].pt.x, y = keypoints[i].pt.y;


        if((X >= corner[0].x && X <= corner[1].x) && (Y >= corner[0].y && Y <= corner[2].y)){
                key_filtered[j]=keypoints[i];
                j++;
        }
    }

i want apply the homography "inv" to "x" and "y"....

sorry probably it's a stupid question :) it's is it possible to apply a homography to the coordinates of a point?

for example in his code:

double X;
double Y;
std::vector<KeyPoint> key_filtered;
for( int i=0; i<(int)keypoints.size(); i++)
{
        double x = keypoints[i].pt.x, y = keypoints[i].pt.y;


        if((X >= corner[0].x && X <= corner[1].x) && (Y >= corner[0].y && Y <= corner[2].y)){
                key_filtered[j]=keypoints[i];
                j++;
        }
    }

i want apply the homography "inv" to "x" and "y"....

is it possible to apply a homography to the coordinates of a point?

for example in his code:

double X;
double Y;
std::vector<KeyPoint> key_filtered;
for( int i=0; i<(int)keypoints.size(); i++)
{
        double x = keypoints[i].pt.x, y = keypoints[i].pt.y;


        if((X >= corner[0].x && X <= corner[1].x) && (Y >= corner[0].y && Y <= corner[2].y)){
                key_filtered[j]=keypoints[i];
                j++;
        }
    }

i want apply the homography "inv" to "x" and "y"....