Trackbars – OpenCV 3.4 with python 3 Tutorial 8

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[betojasz]

Thanx a lot!! The "nothing" function is a callback ... everytime the trackbar change the value, it runs this function!! To understand, put a "print("hello") inside and change the trackbar value!!! If you put a getTrackbarPos inside a loop, the program will read this value even when the value didn't change!! So it's better to think about using the callback!! Nice video!!

[ingmario]

Me han servido mucho sus tutoriales. Muchas gracias.

[qzorn]

This so great to learn from or as a fantastic review. Thanks.

[mehkfatima]

Thanks a lot!!! your video helps me a lot.can you please tell me hoe to insert a button instead of tracebar.This will help me a lot

[ankitranjan]

when I run the code for the first time in spyder, it works perfectly.
But when I run it again, it doesn't work (unless I restart my kernel)

[MinecraftLetstime]

The nothing method is called when the trackbar value is changed.