AI on the Jetson Nano LESSON 21: Working With Region of Interest (ROI) in OpenCV

[@xihengzhang4655]

I'm a student from China, and I really enjoy this series and it really help me a lot, I'll recommend your work to my classmate. Thank you sir !

[@tretty07]

Pleased with myself that I was able to do the homework with no issues, just goes to show what a good instructor you are, a week ago I didn’t even know how to get live camera feed to run in python, now I’m manipulating it 😀😀😀

[@quaternion-pi]

Fantastic lesson and series! Love the real time debugging, homework, and preview of upcoming topics. Thanks!

[@paulmcwhorter]

Missed you during the premier, but glad you caught the video.

[@marksholcomb]

Did the homework. The most challenging one yet for me. My internal "BOOM' and "SHAZAM" make me laugh. Thanks for another wonder lesson.

[@codecage9333]

Just watched today (2020/01/24) and after you explained again how to get the color back into the ROI, I stopped the video and used the bouncing box code from the original homework to get a box moving on the frame for this assignment. There were a few variables I had to rename as the first portion of this program had some different variable names. Worked like a champ! Then watched the rest of the video. Now to try to get homework assignment done for the 25th.

[@RayosMcQueen]

Did the homework and had no major problem. Speaks to a good teacher I have :-)

[@irakandjii2496]

Did the homework and had a blast doing it. For some silly reason I felt compelled to make a parameterized rectangle, then I was kicking myself. Finally got it working :) Thanks!

[@enriqueduhau2696]

I did all the exercises, no major problem, in a short time. This last homework about the bouncing box with color confused me a little bit because cv2 uses x,y, and Python y,x. Congratulations on your work, fantastic learning. I can't wait to get to the AI part.

[@mangalarupasinghe]

Excellent series of lesson Paul. Thank you !!!

[@charliestricklin]

I did the homework and got it working. Starting to get into some good stuff now.

[@CodingScientist]

Count down starts !! Bravo Paul !! Keep Going

[@billfield8300]

Hi Paul, Yes I did the homework and yes it worked. I created the rectangle on my 'roi' window instead of my 'frame' window. Worked as well. Seems a bit cheeky to have 2 homework assignments for 1 lesson.. haha.. but I'm in for the whole pound so tomorrow.. homework.. again. :)

[@lalitjain1969]

Great lesson Paul. Love your lessons. I did the homework but in a slightly different way.

[@pralaymajumdar7822]

Your effort is commendable though you had cold and calf..thank you sir.

[@SuperAlex5]

Did homework, even I was little bit confused at beginning. Still far, but I'm happy I can do some programming. Thank you, Paul.

[@jeraldgooch6438]

Very innovative homework assignment. Got it to work. Thanks.

[@weipengwang9960]

yessir, did the homework, was fun!

[@Diamond_Hanz]

dang... i sit and copy what he does because i can't wait!

[@cnerd]

did the homework and got it. smile

[@TheKverbeeck]

Did the homework and got it going 👌👌👌

[@somebody9033]

Easiest one so far! However, I have the same problem as the one I commented about in Lesson 16... I am using a webcam with the latest Jetson and Jetpack installed.

[@Arief-AK]

Hey Paul, these videos are great! Wanted to ask how you screen record on the Jetson?

[@danbishop4035]

I am really enjoying this series and appreciate all of your hard work...I currently contribute a little on Patreon but I plan on increasing in the near future and encourage everyone to do the same.

[@paulmcwhorter]

Much appreciated!

[@robertharrie6464]

Thanks Paul, brilliant lesson again :-)

[@CodingScientist]

Hi Paul, you were looking very dull no energy in this tutorial, please visit the doctor, take medicine and get well soon. I want to hear your energetic enthusiastic voice BOOOM !!!

[@codecage9333]

Is it just some strange occurrence on my computer or does LESSON 21 show up twice in the playlist in this series. I show it as number 21 and number 22.

[@wayneswan3092]

I did accomplish this homework assignment. Now trying to add trackbar to resize the box on the fly. Just to exercise my brain.

[@wayneswan3092]

I managed to get the trackbar to adjust the box around the ROI, but not the ROI itself. hmmm.. I'm going to figure this out. (EDIT: I did it! I commented out the original BW and BH and named my "getTrackbarPos" to BW and BH. Side note: don't adjust as it is about the bounce off the edge of the display. it will get stuck.)

[@tejobhiru1092]

i tried the homework. did run into some problems. i had two boxes, with with the color, and other the rectangle. moving independently😂 had fun though. great tutorial !

[@billfield8300]

Ooohh... and feel better!

[@ajinshaju3989]

Thanks a lot from India

[@sanfinity_]

finished the homework sir😄

[@itsmeintorrespain2714]

Homework is done but I'll bet my solution will not be as elegant as yours. It's a shame we can't post our efforts somewhere for you to read.

[@markhansen3862]

I added the roi window showing the moving color image from 'nanoCam' window, but had to change the top and left from

[@multitree7427]

Initially coded oppositely; gray rectangle on color background. Made the change after realizing the differences.

[@paulmcwhorter]

Either way demonstrates the same skills. What I am trying to do is get viewers to develop skill, understanding the image is just a 2D array, and can be manipulated with math.

[@multitree7427]

@@paulmcwhorter Yes. The very concept of 2D array goes back to pre-algebra (graphing, mapping, ...). Next homework was fun to work on.

[@markhache6756]

Did the same thing, so I added an if else structure. Added those lines below an 'else clause', then between the 'if clause' and the "else clause" I added the correct code lines. Then added a check below Cv2.waitKey looking for a 't' key press. Used that to toggle the Boolean variable that controls the above if else structure. Now pressing 't' toggles from "Colour on Grey" behaviour to "Grey on Colour" behaviour.

[@KamalSehairi]

I did the homework BOOM

[@OZtwo]

got it done! and you can keep track of how fast by the likes I been giving your videos. :)

[@paulmcwhorter]

Awesome thank you!

[@victorwilliams5131]

I want to buy your Book

[@evetsreniv680]

Before i watch this Lesson, I like the challenge of the previous episode, but failed tomake it work; basically a coloured image directly under a gray image while the ROI takes its image from the former to play over that latter. Too many details in a short time... carry on.

[@KamalSehairi]

I did the homework BOOM