## How do you draw a circle on a picture in Matlab?

Draw a circular ROI on the image, Use the ‘Center’ name-value pair to specify the location of the circle and the ‘Radius’ name-value pair to specify its size. Set the edge of the circle to be striped by specifying the ‘StripeColor’ name-value pair. h = drawcircle(‘Center’,[1000,1000],’Radius’,500,’StripeColor’,’red’);

### How do you make a circle in Matlab?

How to create a filled circle?

- function circles = circle(x,y,r)
- hold on.
- th = 0:pi/50:2*pi;
- x_circle = r * cos(th) + x;
- y_circle = r * sin(th) + y;
- circles = plot(x_circle, y_circle);
- hold off.

**Is there a circle function in Matlab?**

Description. viscircles( centers , radii ) draws circles with specified centers and radii onto the current axes. viscircles( ax , centers , radii ) draws circles onto the axes specified by ax .

**How do you make a circle matrix in Matlab?**

How to create a circle within a matrix

- cx1 = .01; %x position of circle.
- cy1 = .05; %y position of circle.
- cr1 = .02; %radius of circle.
- th = 0:pi/100:2*pi;
- xunit = cr1 * cos(th) + cx1.
- yunit = cr1 * sin(th) + cy1.
- plot (xunit,yunit)
- viscircles([centerX, centerY], radius);

## How do you draw a polygon on a picture in Matlab?

roi = drawpolygon creates a Polygon object and enables interactive drawing of a polygonal ROI on the current axes. To draw the ROI, position the pointer on the image. The cursor changes to a fleur shape. Click to draw vertices of the polygon and drag to draw the lines between the vertices.

### How do you create a mask in Matlab?

Create a Simple Mask

- Step 1: Open Mask Editor. Open the model in which you want to mask a block.
- Step 2: Define the Mask. The Mask Editor contains four tabs that enable you to define the block mask and customize the dialog box for the mask.
- Step 3: Operate on Mask.

**How do you plot a circle?**

Graphing circles centered away from the origin

- Locate the center of the circle from the equation (h, v).
- Calculate the radius by solving for r.
- Plot the radius points on the coordinate plane.
- Connect the dots to the graph of the circle with a round, smooth curve.

**How do you draw a half circle in Matlab?**

⋮

- xCenter_2 = 3/(2*sqrt(13));
- yCenter_2 = -1/sqrt(13);
- theta = 0-2/3 : 0.01 : pi-2/3;
- radius = 0.5;
- x = radius * cos(theta) + xCenter_2;
- y = radius * sin(theta) + yCenter_2;
- plot(x, y), hold on;
- axis square;

## How do you graph a circle equation?

Explanation: The equation of a circle is \displaystyle (x – h)^2 + (y – k)^2 = r^2, in which (h, k) is the center of the circle and r is its radius. Because the graph of the circle is centered at (0, 0), h and k are both 0. Because the radius is 3, the right side of the equation is equal to 9.

### How do I mask an image in MATLAB?

Direct link to this answer

- To create a mask like you said: Theme. maxGL = max(grayImage(:))
- To apply the mask to an RGB image, use this code: Theme. % Mask the image using bsxfun() function to multiply the mask by each channel individually.
- If it’s grayscale, you can do it simpler like this: Theme. grayImage(~mask) = 0;

**How do you put a mask on a picture?**

To Use Applied Layer Masks

- Create an Adjustment Layer and Select the Layer Mask. Create an Adjustment Layer and then select the Layer Mask by clicking on the mask.
- Select Image > Apply Image.
- Choose the Layer You Want to Apply to the Mask.
- Choose the Blending Mode.
- Make Adjustments to the Applied Layer Mask.