ellipse

问题 Let's say my image is img=zeros(100,100,3) , my outputs are several ellipse which i get using a created function [ret]=draw_ellipse(x,y,a,b,angle,color,img) , I can display one ellipse using imshow(ret) .For the moment, I'm trying to show serval ellipse in the image. But i don't know how to code it. will ‘for loop’ work or I need to hold them? 回答1: If this is related to what you were doing in your previous question, then what you need to do is to pass the result of one iteration as input to

问题 I'm trying to create an adaptive elliptical structuring element for an image to dilate or erode it. I write this code but unfortunately all of the structuring elements are ones(2*M+1) . I = input('Enter the input image: '); M = input('Enter the maximum allowed semi-major axes length: '); % determining ellipse parameteres from eigen value decomposition of LST row = size(I,1); col = size(I,2); SE = cell(row,col); padI = padarray(I,[M M],'replicate','both'); padrow = size(padI,1); padcol = size

问题 This is an answer to a question posed in the comments in my possibly poorly worded question about super-ellipses. in Netlogo it is natural to draw geometric shapes in ways that may seem strange in other languages. ask turtle 1 [pendown let d (pi * distance turtle 2) / 360 repeat 360 [face turtle 2 rt 90 fd d] ] for instance inscribes makes turtle 1 draw a circle [360-gon] around turtle 2. I did not invoke any of the standard circle formulas but still get a circle. Is it possible to draw an

问题 There is an ellipse drawn with the following code: graphGraphics = e.Graphics; graphGraphics.FillEllipse(new SolidBrush(Color.White), this.graphBoundries); graphGraphics.DrawEllipse(graphPen, this.graphBoundries); I have a line on this graph and it currently just passes right through it. I want to change the lines height to adjust to the ellipse's boundaries as follows so it wont pass through the ellipse: http://i1379.photobucket.com/albums/ah134/fac7orx2/circlewithlinehelp_zps280d9e76.png

问题 I am trying to detect ellipse in an image using opencv. I find the contours which include ellipse and also some other ones. Any suggestions that how can I check which contours are ellipse? 回答1: if I understand you correctly, you have detected contours some of them are ellipses and some are not and you want to be able to decide which ones are. Is it right? If yes, I would suggest to use cv::fitEllipse() . The doc says that it fits an ellipse to a vector of points so that R-squared is minimal.

问题 I have a program that I can drag, rotate and resize a System.Windows.Shapes.Ellipse in a Canvas panel. To resize and drag the ellipse inside the canvas and always keep it center I need to correct every time its origin, because the ellipse has it origin in the top left corner. Have a way to make the origin in the Ellipse on center by default? Drag: Canvas.SetTop(ellipse, newX - (ellipse.Height / 2)); Canvas.SetLeft(ellipse, newY - (ellipse.Width / 2)); Resize: ellipse.Height = newHeight;

问题 I'm using JAVA. Ellipse2D s1=new Ellipse2D.Float(0,0,100,100); System.out.println(s1.intersects(99, 30, 100, 100)); Should return false but it return true. How to find intersection between 2 ellipse? Thx 回答1: CADEMIA has an useful api which can be downloaded from here. The class cib.util.geo.Geo2D has a method Geo2D#intersection which calculates the intersection points between two ellipses. Hope this will help you. Thanks. 来源： https://stackoverflow.com/questions/6544441/how-ellipse-to-ellipse

问题 Going back to this thread, I was calculating the intersection between two ellipses e.g. the volume of the intersection between versicolor and virginca: using the following mwe: data(iris) log.ir <- log(iris[, 1:4]) ir.species <- iris[, 5] ir.pca <- prcomp(log.ir, center = TRUE, scale. = TRUE) library(ggbiplot) g <- ggbiplot(ir.pca, obs.scale = 1, var.scale = 1, groups = ir.species, ellipse = TRUE, circle = TRUE) g <- g + scale_color_discrete(name = '') g <- g + theme(legend.direction =

问题 How to have rotated ellipse Shape in java? I.e. so that its semi-axes are not parallel to coordinate axes? P.S. I need not just draw this ellipse but have it in memory as a shape object. 回答1: Just take an Ellipse2D object and apply an AffineTransform rotation to it, no? AffineTransform.getRotateInstance(Math.PI / 4) .createTransformedShape(new Ellipse2D.Double(0, 0, 2, 1)); 来源： https://stackoverflow.com/questions/10872311/how-to-have-rotated-ellipse-shape-in-java

问题 I've generated a bunch of data for the (x,y,z) coordinates of a planet as it orbits around the Sun. Now I want to fit an ellipse through this data. What I tried to do: I created a dummy ellipse based on five parameters: The semi-major axis & eccentricity that defines the size & shape and the three euler angles that rotate the ellipse around. Since my data is not always centered at origin I also need to translate the ellipse requiring additional three variables (dx,dy,dz). Once I initialise