获取正确的多边形以显示在图像中
现在真的需要你的帮助
我有一些检测结果。
我希望在这张未旋转的图像上显示此结果（请忽略蓝框）
我的算法逻辑如下
鉴于黄色框的坐标是参考参考框架（图像1的左上角），我试图找到黄色框的坐标，参考顶部的参考框架图1中内部图像的左上角。
所以我使用了基本的trigno（图像1右下角的直角三角形），以获得内部图像左上角的坐标，并参考此点找到黄色框的坐标。
之后我使用，因为我想在图像2上显示结果，我使用内部图像的中心作为我的旋转点，并将黄色框相对于该中心的坐标转换为内部图像的原点（左上角）并使用此矩阵旋转：
[x，y]其中[x，y]代表我的分数
我在图像上生成的多边形是：
我的教授看了一眼并说这是错的。
我已经计算了多少次我完成了逻辑和实现...这对我来说似乎是正确的。任何善良的灵魂能帮助我吗？
这是我的代码的一部分：
// 135度旋转图像的代码
else if(nameForcompare.equals("135")){
angle = 225;
minPoint.set_y(catYmin); minPoint.set_x(catXmin); maxPoint.set_y(catYmax); maxPoint.set_x(catXmax);
//Show detection results of rotated image
g5.setColor(Color.YELLOW);
g5.drawRect((int)minPoint.get_x(), (int)minPoint.get_y(), (int)(maxPoint.get_x()-minPoint.get_x()), (int)(maxPoint.get_y()-minPoint.get_y()));
rotatedX = Double.parseDouble(originalWidth)*Math.cos(Math.toRadians((int)45));
if(catXmin < rotatedX){
o = imageHeight - catYmin;
a = rotatedX - catXmin;
theta = Math.atan(o/a);
h = (o/Math.sin(theta));
if(theta >= Math.toRadians((int)45)){
thetaZ = theta - Math.toRadians((int)45);
oZ = h*Math.sin(thetaZ); //ycoordinate
aZ = h*Math.cos(thetaZ); //xcoordinate
varX = checkPointsBeforeRotationX(aZ);
varY = checkPointsBeforeRotationY(oZ);
}
else{
thetaZ = Math.toRadians((int)45) - theta;
oZ = 0; //ycoordinate
aZ = h*Math.cos(thetaZ); //xcoordinate
varX = checkPointsBeforeRotationX(aZ);
varY = checkPointsBeforeRotationY(oZ);
}
minPoint.set_x(varX);
minPoint.set_y(varY);
}
else if(catXmin == rotatedX){
theta = Math.toRadians((int)45);
h = imageHeight - catYmin;
o = h*Math.sin(theta); //ycoordinate
a = h*Math.cos(theta); //xcoordinate
varX = checkPointsBeforeRotationX(a);
varY = checkPointsBeforeRotationY(o);
minPoint.set_y(varY);
minPoint.set_x(varX);
}
else if(catXmin > rotatedX){
a = imageHeight - catYmin;
o = catXmin - rotatedX;
theta = Math.atan(o/a);
h = (o/Math.sin(theta));
if(theta <= Math.toRadians((int)45)){
thetaZ = theta + Math.toRadians((int)45);
oZ = h*Math.sin(thetaZ); //ycoordinate
aZ = h*Math.cos(thetaZ); //xcoordinate
varX = checkPointsBeforeRotationX(aZ);
varY = checkPointsBeforeRotationY(oZ);
}
else{
thetaZ = Math.toRadians((int)45) - theta;
oZ = 0; //xcoordinate
aZ = h*Math.cos(thetaZ); //ycoordinate
varX = checkPointsBeforeRotationX(oZ);
varY = checkPointsBeforeRotationY(aZ);
}
minPoint.set_x(varX);
minPoint.set_y(varY);
}
if(catXmax < rotatedX){
o = imageHeight - catYmax;
a = rotatedX - catXmax;
theta = Math.atan(o/a);
h = (o/Math.sin(theta));
if(theta >= Math.toRadians((int)45)){
thetaZ = theta - Math.toRadians((int)45);
oZ = h*Math.sin(thetaZ); //ycoordinate
aZ = h*Math.cos(thetaZ); //xcoordinate
varX = checkPointsBeforeRotationX(aZ);
varY = checkPointsBeforeRotationY(oZ);
}
else{
thetaZ = Math.toRadians((int)45) - theta;
oZ = 0; //ycoordinate
aZ = h*Math.cos(thetaZ); //xcoordinate
varX = checkPointsBeforeRotationX(aZ);
varY = checkPointsBeforeRotationY(oZ);
}
maxPoint.set_x(varX);
maxPoint.set_y(varY);
}
else if(catXmax == rotatedX){
theta = Math.toRadians((int)45);
h = imageHeight - catYmin;
o = h*Math.sin(theta); //ycoordinate
a = h*Math.cos(theta); //xcoordinate
varX = checkPointsBeforeRotationX(a);
varY = checkPointsBeforeRotationY(o);
maxPoint.set_y(varY);
maxPoint.set_x(varX);
}
else if(catXmax > rotatedX){
a = imageHeight - catYmax;
o = catXmax - rotatedX;
theta = Math.atan(o/a);
h = (o/Math.sin(theta));
if(theta <= Math.toRadians((int)45)){
thetaZ = theta + Math.toRadians((int)45);
oZ = h*Math.sin(thetaZ); //ycoordinate
aZ = h*Math.cos(thetaZ); //xcoordinate
varX = checkPointsBeforeRotationX(aZ);
varY = checkPointsBeforeRotationY(oZ);
}
else{
thetaZ = Math.toRadians((int)45) - theta;
oZ = 0; //xcoordinate
aZ = h*Math.cos(thetaZ); //ycoordinate
varX = checkPointsBeforeRotationX(oZ);
varY = checkPointsBeforeRotationY(aZ);
}
maxPoint.set_y(varX);
maxPoint.set_x(varY);
}
getCorners();
checkPointsAfterRotation(angle);
checkCornerPointsAfterRotation(angle);
g2.setColor(Color.MAGENTA);
g2.drawPolygon(xPoints, yPoints, nPoints);
Corners1 =0; Corners2 =0;
public static void rotate2(Point originForRotation, Point pointForRotation, Double angle){
double cos=Math.cos(angle);
double sin=Math.sin(angle);
double oX =originForRotation.get_x();
double oY =originForRotation.get_y();
double x=pointForRotation.get_x();
double y=pointForRotation.get_y();
x = x-oX; y = y-oY;
pointForRotation.set_x((cos*x-sin*y)+oX);
pointForRotation.set_y((sin*x+cos*y)+oY);
pointForRotation.show();
}
public static void getCorners(){
if((minPoint.get_x() > maxPoint.get_x()) && (minPoint.get_y() < maxPoint.get_y())){
topleftPoint.set_x(maxPoint.get_x()); bottomrightPoint.set_x(minPoint.get_x());
topleftPoint.set_y(minPoint.get_y()); bottomrightPoint.set_y(maxPoint.get_y());
Corners1 = 1;
}
else if((minPoint.get_x() > maxPoint.get_x()) && (minPoint.get_y() > maxPoint.get_y())){
toprightPoint.set_x(minPoint.get_x()); bottomleftPoint.set_x(maxPoint.get_x());
toprightPoint.set_y(maxPoint.get_y()); bottomleftPoint.set_y(minPoint.get_y());
Corners2 = 1;
}
else if((minPoint.get_x() < maxPoint.get_x()) && (minPoint.get_y() < maxPoint.get_y())){
toprightPoint.set_x(maxPoint.get_x()); bottomleftPoint.set_x(minPoint.get_x());
toprightPoint.set_y(minPoint.get_y()); bottomleftPoint.set_y(maxPoint.get_y());
Corners2 = 1;
}
else if((minPoint.get_x() < maxPoint.get_x()) && (minPoint.get_y() > maxPoint.get_y())){
topleftPoint.set_x(minPoint.get_x()); bottomrightPoint.set_x(maxPoint.get_x());
topleftPoint.set_y(maxPoint.get_y()); bottomrightPoint.set_y(minPoint.get_y());
Corners1 = 1;
}
}
public static Double checkPointsBeforeRotationX(Double pointX){
if(pointX > (Double.parseDouble(originalWidth))){
pointX = Double.parseDouble(originalWidth);
}
return pointX;
}
public static Double checkPointsBeforeRotationY( Double pointY){
if(pointY > (Double.parseDouble(originalHeight))){
pointY = Double.parseDouble(originalHeight);
}
return pointY;
}
public static void checkPointsAfterRotation(int angle){
rotate2(origin, minPoint, Math.toRadians((int)angle));
rotate2(origin, maxPoint, Math.toRadians((int)angle));
//check for out of bound points after rotation
if(minPoint.get_y()< 0){
minPoint.set_y(0);
}
else if(minPoint.get_y() > Double.parseDouble(originalHeight)){
minPoint.set_y(Double.parseDouble(originalHeight));
}
if(minPoint.get_x()< 0){
minPoint.set_x(0);
}
else if(minPoint.get_x() > Double.parseDouble(originalWidth)){
minPoint.set_x(Double.parseDouble(originalWidth));
}
if(maxPoint.get_y()< 0){
maxPoint.set_y(0);
}
else if(maxPoint.get_y() > Double.parseDouble(originalHeight)){
maxPoint.set_y(Double.parseDouble(originalHeight));
}
if(maxPoint.get_x()< 0){
maxPoint.set_x(0);
}
else if(maxPoint.get_x() > Double.parseDouble(originalWidth)){
maxPoint.set_x(Double.parseDouble(originalWidth));
}
xPoints[0] = (int)minPoint.get_x();
xPoints[2] = (int)maxPoint.get_x();
yPoints[0] = (int)minPoint.get_y();
yPoints[2] = (int)maxPoint.get_y();
}
public static void checkCornerPointsAfterRotation(int angle){
if(Corners1 == 0 && Corners2 == 1){
rotate2(origin, toprightPoint, Math.toRadians((int)angle));
rotate2(origin, bottomleftPoint, Math.toRadians((int)angle));
if(toprightPoint.get_y()< 0){
toprightPoint.set_y(0);
}
else if(toprightPoint.get_y() > Double.parseDouble(originalHeight)){
toprightPoint.set_y(Double.parseDouble(originalHeight));
}
if(toprightPoint.get_x()< 0){
toprightPoint.set_x(0);
}
else if(toprightPoint.get_x() > Double.parseDouble(originalWidth)){
toprightPoint.set_x(Double.parseDouble(originalWidth));
}
if(bottomleftPoint.get_y()< 0){
bottomleftPoint.set_y(0);
}
else if(bottomleftPoint.get_y() > Double.parseDouble(originalHeight)){
bottomleftPoint.set_y(Double.parseDouble(originalHeight));
}
if(bottomleftPoint.get_x()< 0){
bottomleftPoint.set_x(0);
}
else if(bottomleftPoint.get_x() > Double.parseDouble(originalWidth)){
bottomleftPoint.set_x(Double.parseDouble(originalWidth));
}
xPoints[1] = (int)toprightPoint.get_x(); xPoints[3] = (int)bottomleftPoint.get_x();
yPoints[1] = (int)toprightPoint.get_y(); yPoints[3] = (int)bottomleftPoint.get_y();
}
else if(Corners1 == 1 && Corners2 == 0){
rotate2(origin, topleftPoint, Math.toRadians((int)angle));
rotate2(origin, bottomrightPoint, Math.toRadians((int)angle));
if(topleftPoint.get_y()< 0){
topleftPoint.set_y(0);
}
else if(topleftPoint.get_y() > Double.parseDouble(originalHeight)){
topleftPoint.set_y(Double.parseDouble(originalHeight));
}
if(topleftPoint.get_x()< 0){
topleftPoint.set_x(0);
}
else if(topleftPoint.get_x() > Double.parseDouble(originalWidth)){
topleftPoint.set_x(Double.parseDouble(originalWidth));
}
if(bottomrightPoint.get_y()< 0){
bottomrightPoint.set_y(0);
}
else if(bottomrightPoint.get_y() > Double.parseDouble(originalHeight)){
bottomrightPoint.set_y(Double.parseDouble(originalHeight));
}
if(bottomrightPoint.get_x()< 0){
bottomrightPoint.set_x(0);
}
else if(bottomrightPoint.get_x() > Double.parseDouble(originalWidth)){
bottomrightPoint.set_x(Double.parseDouble(originalWidth));
}
xPoints[1] = (int)topleftPoint.get_x(); xPoints[3] = (int)bottomrightPoint.get_x();
yPoints[1] = (int)topleftPoint.get_y(); yPoints[3] = (int)bottomrightPoint.get_y();
}
}
1 个答案:
答案 0 :(得分：1)
这是太多的代码要详细追踪，但我会假设你的代码忠实地实现了你描述的数学。我认为问题在于您正在应用纯旋转矩阵。从旋转的小猫到旋转的黄色盒子的转换是平移和旋转的组合。您需要首先将kitty（和黄色框）从（x，y）转换为（0,0）（因此旋转的kitty图像位于图1左上角的kitty左上方）。然后你需要顺时针旋转135度。
使用齐次坐标和矩阵乘法将使您的代码更简单。
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