OpenCV - Drawing a Circle with python

In this tutorial, I will show you how to draw a circle in OpenCV.

OpenCV comes with lots of built-in functions that make our life easier especially when we are working on image processing.

And there is a function called circle in OpenCV which is used to draw a circle.

This function takes following parameters:

1. Image: Takes an image object
2. Center: Center point coordinates
3. Radius: Radius of the circle
4. Color: Takes color in BGR format
5. Thickness: By default set to 1 (optional)
6. Line Type: By default set to 8-connected.It can also be LINE_AA or 4-connected (Optional)
7. Shift: Shifts fractional bits in the point coordinates of center and radius (Optional)

Especially when we are creating closed shapes. Thickness plays an important role. Here if the negative thickness is passed in this function or any other function which creates a closed shape(rectangle, polygon, etc). Then it creates a filled shape (filled with color).

Negative Thickness

Positive Thickness

Anti Aliased Circle

Program

#import cv2 moduleimport cv2 as cvimg = cv.imread("nature.jpg")height,width= img.shape[0:2]#Hollow Circleimg = cv.circle(img,(width/2,height/2),100,(255,145,88),10)#Filled Circle#img = cv.circle(img,(width/2,height/2),100,(255,145,88),-1)#AntiAliased Curve#img = cv.circle(img,(width/2,height/2),250,(255,145,88),10,cv.LINE_AA)cv.imshow('Circle',img)cv.waitKey(0)cv.destroyAllWindows()

Thanks for reading 🙂 🙂

Comments

3D ANALYZER SETTINGS

Settings for Prince of Persia Sands of Time Works with this game, u can try wid others also which are not in above list Performance section: -force zBuffer Hardware limits: -emulate HW TnL caps -emulate Pixel shader caps ANTI-DETECT MODE section: -shaders Z-buffer section: -24 bit zbuffer(with stencil) DirectX DeviceID’s section: NVIDIA GeForce Ti4600 Configuration: VendorID : 4318 Device ID :592 Works well in the following or higher configuration -Intel 865GSA motherboard, -512 MB RAM, -Pentium D dual core 2.66 GHz processor, -No graphics card required…….. have fun.

Choosing the Best Motherboard

We will look at the various factors you should take into account when choosing your gaming motherboard, to ensure that you choose the best motherboard for your needs.If you think of the processor as the brain of a computer, then the motherboard could be described as the central nervous system, responsible for relaying information between all the internal components. In other words, it’s the hub of the computer, where all other components connect to. Since the motherboard is so crucial to your system, buying the best motherboard you can afford is a good investment. Select Your CPU First Before choosing your motherboard, you should have already chosen your CPU. If you haven’t already doneA motherboard will generally only support one type of processor, such as a Pentium 4 or Athlon 64. Different CPUs have connectors that vary physically from one another. So you can’t accidentally plug in the wrong processor into the wrong motherboard. Also, take note that many motherboards

Choosing the Best CPU for Your Gaming Computer

Picking the latest, fastest or most expensive processor on the market won’t always result in the right CPU for your particular system. Some processors are designed to work with certain motherboards, so the CPU you choose will limit the type of motherboard you can get. The CPU (Central Processing Unit) is one of the most important components in any computer system. The CPU could be described as the brains of a computer. It contains the logic circuitry that performs the instructions of the software you run. The performance of your games and other applications will be directly related to this tiny little microprocessor. The Major Players: Intel and AMD Two companies dominate the CPU market, Intel and AMD (Advanced Micro Devices). Both companies make a range of different processor models. For example, Intel have the Core i7 and Core i5 processor models, while AMD have the Athlon and Phenom series. The Best CPU for Gaming If you’re a basic computer user and you don’t

TIPS & TRICKS BLOG

Search This Blog