OpenCV Python Tutorial For Beginners 8 - Handle Mouse Events in OpenCV

OpenCV is an image processing library created by Intel and later supported by Willow Garage and now maintained by Itseez. opencv is available on Mac, Windows, Linux. Works in C, C++, and Python.
it is Open Source and free. opencv is easy to use and install.

Starting with an overview of what the course will be covering, we move on to discussing morphological operations and practically learn how they work on images. We will then learn contrast enhancement using equalization and contrast limiting. Finally we will learn 3 methods to subtract the background from the video and implement them using OpenCV.

At the end of this course, you will have a firm grasp of Computer Vision techniques using OpenCV libraries. This course will be your gateway to the world of data science.

Feel the real power of Python and programming! The course offers you a unique approach of learning how to code by solving real world problems.

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[deepaksingh]

I always thought OpenCV to be very complex in understanding until I saw your videos.
These are explained in just a perfect way.
Please keep adding more and more ..

Also waiting for an advanced playlist, which could cover the advanced topics in CV..

[prabhanshuaggarwal]

This is somewhat like unsupervised learning where you can' t solve the doubts.

[justinshaw]

Fantastic explanation.
Thank you so much.

[Abdullah-]

Awesome sir thank you so much for opencv tutorial

[Андреич-сн]

The whole tutorial is the most useful. One question to Mouse Event handling: is it possible to program a reverse thing: when an object is detected to generate a MousClick event and send it to another application so that that other application processed it is a normal MouseClick?

[ZephyrMcIntyre]

Thank you for recording these video, it's been very helpful. I have a question about the X, Y coordinates and how the function knows that the x, y variables are associated with the location of the mouse event?

[solotuilagivou]

Lovely video i just have one question ... when the right button func is being defined and the BGR variables are being stated.. how is this the IDE able to intepret for example that the format img[y, x, 0] refers to the letter blue? Have we covered that syntax in a previous video or something?

[prabhatdixit]

Why u have given flag and param as parameter to function click_event?

[vigneshkathirkamar]

why do we provide 'y' coordinate first and then 'x' and finally 'channel' for blue, green and red variables under cv2.EVENT_RBUTTONDOWN. Can anyone explain what does that statement do?

[M-sg]

hello, sir: i am wondering that why you get the three color channels by: blue=[y, x, 0], but not blue=[x, y, 0] (i had tried, but it said "the index is out of bounds", why is that? i thought [x, y, 0] make more sense.)

[tanmaykhandelwal]

Is there a way to show those texts only while the button is pressed and invoke it afterwards so that the image won't get messy after some clicks.

[Arun_Kumar_x]

can we do it in a live video?
i searched a lot for mouse events in live videos but I can't find any

[arunesh_]

Iam not having any function called setMouseCallback(), eventhough i installed cv2

[annie]

why you have not put the parameters when you called the click_event function??

[menakakonara]

Hi, why is that program waiting for many inputs, Is that callback function works as a continuous loop

[sidhantmourya]

Do I need to know Python or can I start directly open CV tutorial ?

[debdiptadas]

Can any one answer that why there is not need to write the variables in the click event which is inside the setmousecallback event

[saloniagarwal]

How do I get these results on the live video from my webcam?

[zunairtalish]

Why Did u Don't Pass Values in Function's Parameters

[JaikishanJaikumar]

hello sir
idk why lena.jpg is not working for me even though I have pasted it in the same file