The python/skimage based code (slightly changed from the example code. qtgetblk. Learn more about color Image Processing Toolbox. If you plan to do modifications of a graphic object, the first thing to do is always to retrieve its handle. You simply have to check which circle is neither furthest up or down, nor furthest left or right. File format doesn't matter as long as it has the same. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. Description. . May someone help me here I want to plot an ellipse with origin at (0,0) and semi major axis 2 in horizontal direction and an eccentricity of 0. function circle (x,y,r) %x and y are the coordinates of the center of the circle. The problem is one specific dash line interefers with a data. X and Y must be the same length and must contain at least three non-colinear points in order for a valid solution to be found. Becker's Robot Swarm Lab on 14 Jun 2023. It returns the handle to the image in the axes. if A = imread ('coins. Read and display an image of round plastic chips of various colors. However, the first thing I thought of when reading it was the text function in Matlab. %you might notice imperfections (not very smooth) ang=0:0. Copy. 01:2*pi;Your question is a little unclear. Draw a line over the approximate diameter of a chip. There is another approach you should consider for filled circles: use rectangle () recangle ( [centers_nodeXY-radii_inf_range, 2*radii_inf_range, 2*radii_inf_range], 'Curvature', [1 1], 'FaceColor', 'r', 'EdgeColor', 'r'); The subtraction is because rectangle needs a lower left corner and a width and height, whereas viscircles. clc. I was looking for an interesting. Answers (1) Sami Al-Abbar on 18 Apr 2016. X and Y are 1-D arrays of position data in a rectilinear coordinate system. % Here is where we actually get the boundaries for each blob. 01 is the angle step, bigger values will draw the circle faster but. th = 0:pi/50:2*pi; xunit = r * cos (th) + x; yunit = r * sin (th) + y; h = plot (xunit, yunit); What I need in the end up with is something like this: I can plot the circles and I can plot the points, but I'm not being able to do both. regionprops supports both contiguous regions and discontiguous regions. Documentation Center. . It uses the rectangle function, which lets you define the curvature of the corners so that the rectangle/square becomes an ellipse/circle. 01 is the angle step, bigger values will draw the circle faster but. Newer versions of the Image Processing Toolbox have the viscircles() function for plotting multiple circles simultaneously in the overlay above the digital image. Any help would be greatly appreciated. Trace Boundaries of Objects in Images. 1. example. Answered: Shruti Sapre on 10 Feb 2016. CircX=R*cos (Ang); CircY=R*sin (Ang);1. On the first image 'A' there are circle-shaped objects e. [centers,radii] = imfindcircles (A,radiusRange) finds circles with radii in the range specified by radiusRange. I'm using. th = 0:pi/50:2*pi; xunit = r * cos (th) + x; yunit = r * sin (th) + y; h = plot (xunit, yunit); hold off. MATLAB Graphics 2-D and 3-D Plots Surfaces, Volumes, and Polygons Surface and Mesh Plots Find more on Surface and Mesh Plots in Help Center and File Exchange TagsToday's blog post was written by Spandan Tiwari, a developer on the Image Processing Toolbox team. For rectangular ROI we can use imrect and get the position/coordinate, so is there a similar function to take circular ROI ?. In this example, the coin radii range from approximately 10 to 20 pixels. I would like to know how can I graph circles in Matlab knowing the center and radius? I have tried circles() which does not seem to work because my Matlab version does not have it. imfindcircles 支持 C 代码生成（需要 MATLAB ® Coder™ ）。请注意，如果您选择通用的 MATLAB Host Computer 目标平台，imfindcircles 生成的代码将使用平台特定的预编译共享库。使用共享库可保留性能上的优化，但适用范围仅限于生成的代码所适用的目标平台。 I assume you do not have a parametric form for the circle in 3D, but you do have the equation for the plane where the circle lives in 3D. Learn more about viscircles, fimplicit, legend, circle, geometric object Symbolic Math Toolbox, Curve Fitting Toolboxinstead of saving the output of a viscircles + image to a file, I would like to assign it as a variable. Still, the viscircles is more desirable bcz its faster. The easiest is, to actually plot a filled rectangle with full curvature: %// radius r = 2; %// center c = [3 3]; pos = [c-r 2*r 2*r]; r = rectangle ('Position',pos,'Curvature', [1 1], 'FaceColor', 'red', 'Edgecolor','none') axis equal. So, if r0 is your radius limit (scalar), and th1 and th2 are the angle limits (scalars), then the following code should give you the points that are falling into the. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!Looks like the area of a triangle with sides A and D and angle theta between them. e. imshow ('coins. circfit (X,Y) returns scalar radius R of a fitted circle. I want to fill the circles depeding on their colours. Ricarica la pagina per vedere lo stato aggiornato. viscircles (centersDark, radiiDark, 'LineStyle', '--' );when i run my code, matlab finds 12 centroids and when i use 'viscircles' its showing me 12 rings on top of each other. Accepted Answer: Akira Agata. 5]). %you might notice imperfections (not very smooth) ang=0:0. function h = circle (x,y,r) hold on. Description. m, both implementing Wezlz’s algorithm [ 1 ]. I wanted to draw several circles in one picture and edit them later. I have all the circles saved to a handle called CTR_circles1 but when i delete CTR_circles1 the circles don't disappear. : hg = viscircles (circle_pos, circle_rad); You can use the imfindcircles function to find the centers and radii of circles in an image. Here we are obtaining the width and height of the figure using "Position" property. if ~exist (fullFileName, 'file') % The file doesn't exist -- didn't find it there in that folder. But i can't do it. fullFileNameOnSearchPath = baseFileName; % No path this time. h = viscircles ( ___) returns a handle, h, to the drawn circles. viscircles draws two lines with the same coordinates but with different line widths (and potentially different colors). . Capture. The output, centers, is a two-column matrix containing the ( x,y) coordinates of the circle centers in the image. png'; fullFileName = fullfile (folder, baseFileName); % Check if file exists. I would like to select the images by app designer and do background subtraction, then detect the circles by using viscircles function. MATLAB Online™ provides access to MATLAB® from your web browser. First of all, you are gonna need an Image, in which you are gonna find circles so I used this image of a bike. viscircles (centers,radii, 'Color', 'r'); so, what did you do that was different than this. If you figure out to incorporate viscircles, lemme know. MATLAB Graphics Formatting and Annotation 3-D Scene Control Lighting, Transparency, and Shading. h = viscircles ( ___) returns a handle, h, to the drawn circles. Learn more about image analysis MATLAB, Image Processing ToolboxNot with viscircles(). It has two children, accessible with the Children property; each child is a Line object. There is another approach you should consider for filled circles: use rectangle () The subtraction is because rectangle needs a lower left corner and a width and height, whereas viscircles () uses center and radius. ', mfilename);Hough Circle Detection in MATLAB using Image Processing toolbox. Algorithms. CIRCLES was inspired by the built-in function VISCIRCLES; the two main differences being that it draws circles as a patch rather than a line and offers a bit more flexibility (I think) in terms of coloring the faces/edges. This MATLAB function draws circles with specified centers and radii onto the current axes. Detecting Edges Using the edge Function. Click and drag to draw the circular ROI. Children (1). viscircles([centerX ,centerY ],. [centers,radii] = imfindcircles (A,radiusRange) finds circles with radii in the range specified by radiusRange. viscircles ( ___,Name=Value) uses name-value arguments to specify additional properties of the circles. . Nice, but yd = h. Image Processing Toolbox. Find more on Data Distribution Plots in Help Center and File Exchange. Copy. Plots are displayed when the code you are evaluating returns a plot object. Here's a function to draw circles: Theme. . d = drawline; The length of the line ROI is the diameter of the chip. % Check the entire search path (other folders) for the file by stripping off the folder. None of the circle drawing primitives (rectangle and viscircles) seem to support ahlpa properties. I use the "imfindcircles" command to find them. Cropping Circular region of interest around a point in MATLAB. I am creating a circle at a specified position using. Modified 8 years, 4 months ago. A circular sector of radius r0 with the center in the origin of the coordinates is the set of points with the coordinates ( r, θ) such as: r < r0. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!Hi KSSV, thanks for your quick response, much appreciated. You'd have to create a digital RGB image and then you could synthesize such an image. viscircles () simply draw circles on your graph or image at the locations you specified. Theme. My Matlab version doesn't have viscircles, so here's an approach which plots each individual circle with alternating colors. Attached is a screen shot. the cose is: Theme. 0001,-122. Plotting a Circle Using the viscircles() Function in MATLAB. Learn more about image analysis, matlab, imfindcircles Image Processing Toolbox I am trying to find the center, radius and area of a circle. The output, centers, is a two-column matrix containing the ( x,y) coordinates of the circle centers in the image. Attached is my Matlab code which I want to write in Julia. 2) axis equal. . Shown in the code are two examples found on the net. However, I would still like some insight into a good method of collision detection with these obstacles. Sign in to comment. thank you Roger but i am new to matlab see i am havnig latitudes and longitudes of some places that are L1: 52. viscircles(centersStrong5, radiiStrong5, 'EdgeColor', 'b'); why the background is white?where is the image?if there is a function that find the circle in the. I was looking for an interesting image to show the use of imfindcircles 1. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. Note for readers: viscircles only permits one color to be set for all of the circles it draws in one call. Toggle the distance label on/off. %0. Converting location into binary masks and filtering the image with such masks. Type 'doc rectangle' in the command window for an explanation of the parameters. function circle (x,y,r) %x and y are the coordinates of the center of the circle. Or if you want to specify the number of segments on the circle, you can use linspace (): startAngle = 0; endAngle = 2 * pi; numberOfSegments = 360; % Whatever you want. timeline = [0. I would like to plot all these circles at. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. figure rectangle ( 'Position' , [0 0 2 4], 'Curvature' ,0. But I have no idea in which units it is. theta = linspace (startAngle, endAngle, numberOfSegments);本小节中说明MATLAB检测图像中圆形对象的imfindcircles函数的使用方法，并通过viscircles函数将检测到的圆标注出来。 2. function plot_model exit_agents=csvread('C:UserssonyDesktoplatest_mixed_crowdsDecemberI'd like to draw a circle and move it in Matlab plot figure. MATLAB Graphics 2-D and 3-D Plots Data Distribution Plots. 3 or whatever you want. h = viscircles ( ___) returns a handle, h, to the drawn circles. I did some processing on the image and increased the. When I use SpriteKit (which showed the best results), it ended up looking like this: Note that there is actually a spaceship instead of a circle. png"); if size (layer,3)>1. Find more on Lighting, Transparency, and Shading in Help Center and File Exchange. I've been searching how to fill a circle created by the viscircles function with a hatched pattern like '' but all the functions posted on mathworks have resulted unsuccessful or with errors that I can't (or don't know how) to fix. To illustrate, this example creates a new figure and then loops, drawing a set of circles with each iteration, clearing the axes each time. . Exact minimum bounding spheres and circles can be computed using the functions titled ExactMinBoundSphere3D. Learn more about circle packing, packing, circle MATLAB Dear all, i need to pack identical circles on a certain rectangular surface (e. ^2. By default it is 0. 9959. MATLAB always returns the first solution counter-clockwise from the positive real axis, i. The circles edge is a gradient from black to white so I am trying to threshold it so I can manipulate where the circles edge starts. IMG(ik,:)={centers, radii, metric, ik}; where centers is a n*2 array containing the 2D coordinates of the n circles I detected, radii is the values or their respective radii, metrics provides an info on the "quality" of this detection. Pantograph mechanism is used for copying 2D objects like photographs or different shapes, and uniformly scaling them such that the copy is enlarged or shrieked by a scale factor. With MATLAB Online, your files are stored on. 648. Learn more about viscircles Image Processing Toolbox. h=viscircles (centers,radii,'Color','k','LineWidth',wid); will someone help me that how to draw the circles (by assigning the value of h or any other procedure) on a white binary image of 256*256 pixels. graphics. 05) %draws circle of radius 0. Learn more about plotting, circle Image Processing ToolboxEncuentre todos los círculos oscuros de la imagen que se encuentran dentro del rango de radio. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! Hi KSSV, thanks for your quick response, much appreciated. 13: Circles drawn using function viscircles. This is how you draw a filled circle of radius R at (x,y) in the axis of your graph using "area" command: Ang = 0:0. Chidren (1) should be yd = h. Tested on version 2018b Update 3. Detect Corners in Images. Can someone help me to get a circle and that is aslo filled-color?There is another approach you should consider for filled circles: use rectangle () The subtraction is because rectangle needs a lower left corner and a width and height, whereas viscircles () uses center and radius. F = viscircles ( [Xposition Yposition], radious); Later on the code I need to update the circles' position by using the hanfle `F`, in the same manner that if this was a scatter plot I could say. I tried using getimage, but it gets only the original image, without the circles marked in it. To try it out I used the attached test image. I do this task many more times thorughout the code but for the initial time I want to use it, it doesn't work. I used viscircles to plot the circles but i can not arrive to color the inside of circles. %r is the radius of the circle. UIAxes matlab. The output, centers, is a two-column matrix containing the ( x,y) coordinates of the circle centers in the image. bwarea estimates the area of all of the on pixels in an image by summing the areas of each pixel in the image. A = imread ('sample. As answered earlier, to suppress displaying figures during instantiation first call. ^2. h = viscircles ( ___) returns a handle, h, to the drawn circles. 0410 55. 1344,-106. distanceToCenter = distanceImage (row, column) % Read distance from distance image (not optical RGB image) Kinect gives you two images. They are fine for object 2 (circle) matlab. Find more on Polar Plots in Help Center and File Exchange. Contents. Using this we are able to calculate the center coordinates. a = uiaxes; % replace with you app. . Then, instead of calling viscircles, call appviscircles. You can use the imfindcircles function to find the centers and radii. Still, the viscircles is more desirable bcz its faster. その中で今回の記事は円の認識の方法についてまとめていきたいと思う。. Read and display an image of round plastic chips of various colors. Link. Copy Command. You can use meshgrid to create a grid of x and y coordinates and then use the equation of the circle to check whether each x/y pair is within the circle or not. Copy. So I have used imfindcirles and viscircles to find and visualize the circles in a figure window. But with this code you get the contour of the circles. clc; % Clear the command window. Hello, everyone, I need your help. dear raja, most probable you are using viscircles to highlighter the circles, this commands uses superimposing of graph over the image not actually changes the pixel values. The area of a triangle is often greater than 1 but depending on the values of the variables could also be small < 1. So in your case, you would have to call viscircles by specifying a return value (which will contain the handle you want). 648 L2: 37. png. What this implies you can retrieve the XData and YData coordinates of the first child of the. Typical chips have diameters in the range 40 to 50 pixels. I used the function viscircles. I have drawn the circles using the viscircles function which I'm not very familiar with, so perhaps my. Method 1: modifying circles after creation. visboundaries uses bwboundaries to find the boundary pixel locations in the image. There is another approach you should consider for filled circles: use rectangle () recangle ( [centers_nodeXY-radii_inf_range, 2*radii_inf_range, 2*radii_inf_range], 'Curvature', [1 1], 'FaceColor', 'r', 'EdgeColor', 'r'); The subtraction is because rectangle needs a lower left corner and a width and height, whereas viscircles () uses center. 4. png'); [centers, radii, metric] = imfindcircles (A, [15 30]);For instance, you can utilize the distance of the circle centers (or correlations of circles). There is no masking feature for that function. use this program to save circles with markings. thank you for your help LatifaStep 1: Load Image. % Check the entire search path (other folders) for the file by stripping off the folder. elim_circles3 (i) = viscircles (centers_node5, radii_node2, 'color', 'k', 'linestyle', '--'); elim_circles4 (j) = viscircles (centers_HS_kept, radii_node2, 'color', 'k',. I have tried "imfuse(Image,Circles)" but this does not work because the circles are not an image, but a "matlab. [lat,lon] = scircle1 (lat0,lon0,r,az) finds coordinates for the section of the small circle specified by az. But I have no idea in which units it is. Just total them up as you go. viscircles 함수는 원을 플로팅하기 전에 대상 좌표축을 지우지 않습니다. Teams. To draw the ROI, position the pointer on the image. This will yield a logical result which can. I have used the 'viscircle' command of MATLAB. Hi, I am trying to get a circular ROI within the image. fprintf ('Beginning to run %s. Learn more about circle, dot in circle, grid, grid of dotsFunction Reference: viscircles. Impossibile completare l'azione a causa delle modifiche apportate alla pagina. Learn more about viscircles, set Image Processing Toolbox Basically when I try to set a different color to a Viscircle using circle. 5. %you might notice imperfections (not very smooth) ang=0:0. I need to plot a number of circles with the same radius. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. This was a cosmetic adjustment that was originally done to make lines with different markers look good together when the MarkerSize properties were the same. Below is the code I am using to draw my circles and a picture of what is happening on the plot. 1, 8. . AbstractThe paper explains the mathematics behind simulation of Pantograph Mechanism in MATLAB. Step 2: Determine Radius Range for Searching Circles. Step 2: Determine Radius Range for Searching Circles. 2*exp(i*pi/3) or: 1 + 1. plotEllipses([0, 0], [10, 0. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. With viscircles, you can effortlessly create circular shapes within your MATLAB plots. % draw exlcusion range circles b/w hormone seeds and hormone seeds. therefore, i have the coordinates of the centres of all circles i a two-column vector. viscircles - How to flip dashed line? I'm using viscircles to draw a circle with the dashed line property. thanks for the answer but I want just a simple command in matlab to fill a circle that is plotted with specified radius and center coordinate 3 Comments. You'd have to create a digital RGB image and then you could synthesize such an image. Hi, I have written this code in Matlab which runs perfectly for me and gives me the plots I needed together with the solutions. m and paste in the code below. 5. m. h=viscircles (centers,radii,'Color','k','LineWidth',wid); will someone help me that how to draw the circles (by assigning the value of h or any other procedure) on a white binary image of 256*256 pixels. instead of saving the output of a viscircles + image to a file, I would like to assign it as a variable. viscircles([x3, y3], r3, 'Color', 'b');. C = rand (1,2) ; % center of cricle. clc clear clear all I= rgb2gray(imread('empty. png'), [20 100]); viscircles (a,centers, radii) Hi everyone, I'm trying to show the processed image after viscircles function. 3. To plot a set of circles defined by their center points and a radius, you can use the the rectangel function with 100% curvature. I have tried "imfuse(Image,Circles)" but this does not work because the circles are not an image, but a "matlab. %// radius r = 2; %// center c = [3 3]; pos = [c-r 2*r 2*r]; rectangle ('Position',pos,'Curvature', [1 1]) axis equal but set the curvature of the rectangle to 1!1 Answer Sorted by: 1 Most colors in Matlab support a fourth input value which is transparency with values between 0 and 1 where: 0: fully transparent 1: fully. png'); Copy. MATLAB Graphics 2-D and 3-D Plots Surfaces, Volumes, and Polygons Surface and. This MATLAB function draws circles with specified centers and radii onto the current axes. Compute the mean value of the background pixels (using logical indexing again!). am trying the following code but getting only one. It is already the default type. 0 Comments. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. Here's a function to draw circles: Theme. . Documentation Center. 2. Copy. If you figure out to incorporate viscircles, lemme know. The way it handles multiple circles is that it uses a single Line object with NaN. centers = imfindcircles (A,radius) finds the circles in image A whose radii are approximately equal to radius. Thanks, Spandan!This example shows how you can use imfindcircles to automatically detect circles or circular objects in an image. 画像ファイルを読み取って認識. 01:2*pi;This should work. Any help would be greatly appreciated. Sign in to answer this question. That can involve using scatter3 () instead of scatter () and specifying a constant Z coordinate above or below the implied Z=0 of other objects. You can use the imfindcircles function to find the centers and radii of circles in an image. The problem is one specific dash line interefers with a data point (the circle is stack backwards, but its color and the data color both have red hue). The function can also return position of the center of the fitted circle and the root. Tags image processing; Community Treasure Hunt. To create a 2D logical image of a solid circle (a disc), you can use code like this: % diameter, center, and image size. jpg file extension. 1 Answer Sorted by: 6 There are various options to plot circles. Here is a MATLAB function that plots a circle with radius 'r' and locates the center at the coordinates 'x' and 'y': Theme. best regards jayant. h. The output variables centers and radii from imfindcircles can be passed directly to viscircles. . UIAxes. boundaries = bwboundaries (mask); % boundaries is a cell array - one cell for each blob. Circles are specified by a Nx2 matrix centers with x,y coordinates per row, and a N length vector radii . viscircles. To crop the circle from the image, use drawcircle (): Theme. X = get (obstacle_rect,'position'); in order to get the the position data. viscircles (ax,centers,radii) draws circles onto the axes specified by ax. Copy. 05) %draws circle of radius 0. Q&A for work. m and paste in the code below. Theme. Connect and share knowledge within a single location that is structured and easy to search. Answers (1) Aquatris on 7 Nov 2018. viscircles (ax,centers,radii) 在 ax 指定的坐标区中绘制圆。. Copy. I want to fill the circles depeding on their colours. To draw a mask, get the indices lying inside the circle using inpolygon and make those indices zero. I think you are going in a good direction by using the Hough Transform for circles (imfindcircles). %r is the radius of the circle. qtsetblk. Sorted by: 2. First of all I know there is an issue with my for loop/iteration method and I'm also unsure how to map these circles onto the projection using the same scale, it seems they plot onto a separate grid. At the underlying level, it use a line object for all of the circles themselves, and a second thicker line object for the edges of the circles, counting on the thinner object to only overlay part of the thicker object to create edging on. Copy. Position the cursor anywhere inside the ROI, press and hold the mouse, and move the ROI over the image. qtdecomp. The additional output argument, radii, contains the estimated radii corresponding to each circle center in centers. X and Y are 1-D arrays of position data in a rectilinear coordinate system. 01 is the angle step, bigger values will draw the circle faster but. now i would like to label every circle on my image. rectangle ('Position',pos,'Curvature',cur) Here's a demo. figure). Select a Web Site. Learn more about circle, imfindcircles, viscircles MATLAB, Image Processing Toolbox Hi, function viscircles gives me the output radii = 30 . Sign in. There are six different patterns, each representing a different area:In the case of OpenGL, you need to make sure that the item that you want to be on "top" has a higher (projected) Z coordinate, closer to the front from the perspective of the viewer. 4. You can use viscircles() if you have the Image Processing Toolbox, or you can use rectangle() (yes, I know it's a deceptive name) if you don't. rectangle. I do this task many more times thorughout the code but for the initial time I want to use it, it doesn't work. m. g. Using viscircles(), how to draw with multiple. You just have to adjust the sensitivity a bit. viscircles ( ___,Name=Value) uses name-value arguments to specify additional properties of the circles. clc; % Clear the command window. We then calculate the difference between the new position and the current position using dx = new_x - x and dy = new_y - y. png'; fullFileName = fullfile (folder, baseFileName); % Check if file exists. h = viscircles ( ___) returns a handle, h, to the drawn circles. I am plotting some circles with certain radius. How to plot 2D ring with surf ? . . 5 at those points using viscircles. Image Processing Toolbox. This MATLAB function draws circles with specified centers and radii onto the current axes. After this want to draw ellipse around all data plotEllipses. This happens frequently because imfindcircles is a circle detector, and similar to most detectors, imfindcircles has an internal detection threshold that determines its sensitivity. Based on your location, we recommend that you select: . Find the treasures in MATLAB Central and discover how the community can help you!visboundaries (BW) draws boundaries of regions in the binary image BW on the current axes. MATLAB Graphics 2-D and 3-D Plots Surfaces, Volumes, and Polygons Surface and Mesh Plots. I2 (mask) = bg_mean; imshow (I2) title ( 'Circle pixels filled with average background' ) Let me point out two related Image Processing. Learn more about circle packing, packing, circle MATLAB Dear all, i need to pack identical circles on a certain rectangular surface (e. Object 2: inscribedRadius = 130. th = 0:pi/50:2*pi; xunit = r * cos (th) + x; yunit = r * sin (th) + y; h = plot (xunit, yunit); I want to animate a ball travelling in 3-D space along a parametrized curve, say a helix. Tags. Devargya chakraborty on 1 Mar 2023. radius. . end % Callbacks that handle component events. The easiest is, to actually plot a filled rectangle with full curvature: %// radius r = 2; %// center c = [3. Theme. h = viscircles ( ___) returns a handle, h, to the drawn circles. You can use the outputs of this function to display polygon regions by using the patch function. So I have: [centers, radii] = imfindcircles (I, [15 35],'ObjectPolarity','bright','Sensitivity',0. viscircles ( ___,Name=Value) uses name-value arguments to specify additional properties of the circles.