我没有在openCV中找到任何在
java中将平面图像转换为圆柱形的示例,我希望它在2d而不是3d中渲染图像,也没有找到任何示例代码或书籍.下面是我想在杯子周围扭曲的图片的图像.
一本好书和示例代码将非常感激.
到目前为止我已经这样做了.建议我的@Amitay使图像凹陷,使用这个例子Wrap image around cylinder ,但坚持转换.
import java.io.File; import org.bytedeco.javacpp.indexer.UByteBufferIndexer; import org.bytedeco.javacpp.opencv_core.Mat; import org.bytedeco.javacpp.opencv_core.*; import static org.bytedeco.javacpp.opencv_highgui.imshow; import static org.bytedeco.javacpp.opencv_highgui.waitKey; import static org.bytedeco.javacpp.opencv_imgcodecs.CV_LOAD_IMAGE_COLOR; import static org.bytedeco.javacpp.opencv_imgcodecs.imread; /** * * @author BTACTC */ public class CupWrapping { Mat image; Mat dstImage; int width; int height; public CupWrapping(File imageFile) { image = imread(imageFile.getAbsolutePath(),CV_LOAD_IMAGE_COLOR); width = image.size().width(); height = image.size().height(); dstImage = new Mat(width,height,image.type()); UByteBufferIndexer sI = image.createIndexer(); UByteBufferIndexer sD = dstImage.createIndexer(); for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { Point2f current_pos = new Point2f(x,y); current_pos = convert_pt(current_pos,width,height); Point top_left = new Point((int) current_pos.x(),(int) current_pos.y()); //top left because of integer rounding //make sure the point is actually inside the original image if (top_left.x() < 0 || top_left.x() > width - 2 || top_left.y() < 0 || top_left.y() > height - 2) { continue; } //bilinear interpolation float dx = current_pos.x() - top_left.x(); float dy = current_pos.y() - top_left.y(); float weight_tl = (float) ((1.0 - dx) * (1.0 - dy)); float weight_tr = (float) ((dx) * (1.0 - dy)); float weight_bl = (float) ((1.0 - dx) * (dy)); float weight_br = (dx) * (dy); byte value = (byte) (weight_tl * sI.get(top_left.y(),top_left.x()) + weight_tr * sI.get(top_left.y(),top_left.x() + 1) + weight_bl * sI.get(top_left.y() + 1,top_left.x()) + weight_br * sI.get(top_left.y() + 1,top_left.x() + 1)); sD.put(y,x,value); } } imshow("",dstImage); waitKey(0); } public Point2f convert_pt(Point2f point,int w,int h) { //center the point at 0,0 Point2f pc = new Point2f(point.x() - w / 2,point.y() - h / 2); //these are your free parameters float f = w; float r = w; float omega = w / 2; float z0 = (float) (f - Math.sqrt(r * r - omega * omega)); float zc = (float) ((2 * z0 - Math.sqrt(4 * z0 * z0 - 4 * (pc.x() * pc.x() / (f * f) + 1) * (z0 * z0 - r * r))) / (2 * (pc.x() * pc.x() / (f * f) + 1))); Point2f final_point = new Point2f(pc.x() * zc / f,pc.y() * zc / f); final_point.x() = final_point.x() + w / 2; final_point.y() += h / 2; return final_point; } public static void main(String[] args) { File imageFile = new File("image/C13.jpg"); CupWrapping wrap = new CupWrapping(imageFile); } }
解决方法
请看
Warp Image to Appear in Cylindrical Projection中的这个答案
你只需要改变两件事:
>因为你想要凸投影而不是凹面,你需要改变函数convert_pt中的代码行.
从:
float zc = (2*z0+sqrt(4*z0*z0-4*(pc.x*pc.x/(f*f)+1)*(z0*z0-r*r)))/(2* (pc.x*pc.x/(f*f)+1));
至
float zc = (2*z0-sqrt(4*z0*z0-4*(pc.x*pc.x/(f*f)+1)*(z0*z0-r*r)))/(2* (pc.x*pc.x/(f*f)+1));
>将所有其余代码形式c转换为java.
祝好运