Hand Distance Measurement with Normal Webcam + Game | OpenCV Python

In this project we will find the distance between a single camera and a hand. We will use basic mathematics to create this application. We will also create a simple game using this method.
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#ComputerVision
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[@murtazasworkshop]

If you are getting an error getting the x and y value using hand['lmList'][8] then use hand['lmList'][8][:2] instead. This is because the latest version of cvzone consits to x,y,z values instead of only x,y. So you have to define that you only need the first two elemnts by adding [:2]

[@tibettenballs4962]

Best most unique tutorials… his website has variants of the YT projects. I’ve been mashing parts of what he teaches into my own apps. Thanks for your unique approach.

[@1-minutesanimation853]

Man this guy's imagination with cvzone or mediapipe would never stop

[@muradmehrababrar4133]

You are THE BEST tutor for python and OpenCV !

[@venkir1408]

Fantastic, I really enjoyed this hands on session. Very informative and though its 1 Hr it was very usefull. Great one I seen after a long time.

[@eemanmajumder]

Hey seriously your tutorials help a lot and I have a request please dont become like others and start making premium tiers I am poor and seriously this is my only way of learning opencv

[@rubialugattimoreira1978]

Always great content!

[@dinmalikogli5983]

MashaAllah bro I am watching all of your CV videos and they are very helpful. Hi from Uzbekistan

[@yousefwaelsalehelsaidkhalil]

This Is A Really Amazing Channel! I Was Searching For AI Projects And Computer Vision And I Found It Pretty Easy While Its A Very Important Source For Learning. Please Continue Uploading Videos Like This With Explanation.

[@SuperbonyTheCat]

with a single camera ! respect ! 😺 first seen in "Minority Report" (2002)

[@YazeedAlkosai]

great work with very unique ideas.

[@microsoftsarker]

Thanks brother, it worked!! I watched many video but only this worked!! I am very thankful to you!., LIKED AND SUBSCRIBED

[@faizalam8425]

Thank you so much, Sir. Appreciate your work.

[@hotspicylife3388]

Can I ask something sir? Is your program can be used for outdoor? Like how will different ammount of light intensity affect your program and such. My school project is kind of similiar to yours so I can't help but wonder. Thankyou! Edit : Also, imagine if you install the measurement program with full body tracking into a robot. That would be awesome! Just like from "Real Steel" Movie

[@BagusBangets]

Powerful bhai👍

[@johnryan8645]

I love that you did a curve fit example! But the hand is a line on a sphere of radius r. 4/3pi*r3…. And we have spherical distortion as we move to the sides. All doable, and worth doing to make a more generalized distance estimator. Nevertheless, I enjoyed the video. Great job!

[@saeedalikhan7128]

thanks sir for your Informative video

[@santoshgujar5237]

Beautiful, Sir, Thank you, Sir

[@senaysew8231]

Thanks you great man!

[@yasirali8409]

Great sir 👍

[@vittal255]

Namaste Sir, I regularly watch your videos and by watching your videos i developed interested in Computer Vision and made some cool application.. Sir how to get the direction of the bounding boxes , this feature is needed for one of my application. I would really appreciate your guidance.

[@nanayawforson9306]

I really admire your works. How do you compile these projects as mobile app or desktop application for users?

[@michelvancaneghem]

If you use Thales' theorem, then we find for the distance : y = 6000 / x, which is still approximate because it is not a perfect camera

[@kenichimori8533]

Define x = 7000 ppp

[@Labbsatr1]

Thank you so much

[@TuanTran-xj6te]

真好，非常好。

[@tahirullah4923]

very nice sir. SIR can you make a vedio based on distance measurement from any reference point i.e from wall or from or bottle or any other object

[@gplgomes]

Great video. A improve: for a distance between hands dots of "d" for a "L" lengh then if you have a new "d1" so the new distance "L1" will be L1= L d/d1. In your case we get L1=300*20/d1 or L1=6000/d1

[@yade1234]

Hey, could you refer me to the mathematical property that allow us to derive this? or how it's done from Thales' theorem?

[@gplgomes]

@@yade1234 it from Thales Theorem. Murtaza made a new video "Face Distance" which he is using and explaining this propriety: kzbin.info/www/bejne/oKTSlmSDZ6adfM0

[@gplgomes]

Basiclly is a tangent rule or a triangle similarity.

[@yade1234]

​@@gplgomes Oh hey thanks for the link too, I saw the video and it made great sense to me. Still I was wondering how we were able to perform distance measurement with just one real world measurement unlike the video where we were calculating the focal length and then had to use it along with the real world distance between the eyes. Whereas in this formula we are only using that one real world measurement of the hand from the camera and it's still giving very good results.

[@gplgomes]

​@@yade1234 , it is a proportional result. It is based on a knowing object (distance between the eyes) at a specific distance, then it can calculate on other distances. The first step is the calibration, wich is used for other mensuras.

[@nikolamilovanovic8651]

First like, then watch👍

[@actionkey8042]

AWESOME

[@manouchehryousefi936]

Thanks

[@arrvind7385]

wow amazing

[@oswaldkit]

Cool!

[@carlossanpablo3477]

Te quiero joder, me has solucionado la vida muchisimo

[@thegamechanger7157]

Yeah thats it. The size, I have manage that. The actual size or near accurate height but the cctv companies needs to sent the specifications of the camera

[@Gahyeon22]

Hi I used vscode. And I watched a video of you using mediapipe to extract hand skeleton and stack blocks. I have a question here. I want to add how far the webcam is from the hand. However, the code in this video does not extract hand skeleton when applied to Unity. I want you to tell me why and how

[@simam7]

what were u using, vscode? or what

[@julianoandriolloteixeira]

Hello, is it possible to create software that identifies the speed of an object in a video? Please

[@itheblackwolfofmyfamily]

You’re hero my brother, and I love your videos, but I have a question. I want to become a Computer vision engineer, so what language do you think I should learn? Python or C++? Thank you for the educational contribution, and keep us the good work.

[@jean-charlesrisch7841]

Python is all you need !

[@ajaymin28]

Python is ok, but c++ runs faster than python. use c++ when optimization/speed is important.

[@wadahadlan]

I agree with both sentiments. Start your project in Python, by then you would have internalized paradigms, and porting to C++ could be an excellent first project in that language

[@Diego-rb9vo]

Thank you very much for sharing this for free sir with computer vision would there be a way to do that with recognition of hand gestures to make a first person shooter where a hand gesture indicates whether to shoot or not, another indicates to change weapons, etc?

[@ssuthan1337]

He has another tutorial on finger counting which you might find useful

[@Diego-rb9vo]

@@ssuthan1337 thank you

[@shrijeetbiswas1640]

i tried to re crate this, however i have made a strange observation the distance still changes when you flip your hand keep it in the same position, for example try showing Palm and Thumb Up sign , the distance will change even if your hand is at the same position.

[@himanshukulkarni9535]

First like first comment

[@ahmadaladawi1633]

Thanks, just wondering if the measurement is different from one camera to another as you were using an external camera that has a different location from our laptops' cameras. great work and thanks again :)

[@dogukantombul1045]

what if I dont use my computers camera and dont use videocapture. How do I do that? Because read() function wont work also

[@saha2537]

How can i get 3D coordinate(x,y,z) not only depth

[@nrdesign1991]

This might be great for measuring with calibrated markers. Or measuring the distance between the hands in space, by determining the distance to the camera, and also between the hands.

[@martondemeter4203]

The cover image, where it highlights his hand as 44cm is how guys see themselves before the first date:D jk, nice content (I know it is the distance)

[@lindiabut1277]

hello sir, can i ask? how to make thats in website, or it can use more library like flask?, im trying using flask and thats(hand distance measurement) got error, can any one help me?

[@aabu4348]

Can it become more precise like at mm level

[@stacymaimoon4189]

So , by using this approach you can only estimate the distance if you pre-calibrated? (measuring band). Which, of course, makes it slightly less practicable. Otherwise if cvzone does not support depth measuring (which I strongly suppose), there is no way to achieve this. It would be interesting if you could make a video of the same stuff, but using a Kinect or a similar sensor. TIA.

[@pranavsreedhar1402]

one could try to estimate distance by finding its relationship with FOV angle by correlating it to the area occupied by the hand within the frame. a larger FOV leads to lesser accuracy with increasing distance and a smaller FOV would lead to better results at the cost of lesser detectable/usable area. A kinect or a similar sensor would generally be costlier and be very specific in terms of implementation and would obviously be using more advanced tech than a webcam. Im guessing the tape measurement is a easier way to calibrate than to find out the FOV of say cheap chinese webcam with no clear specifications. a far cheaper alternative would be to use a portable TOF sensor like the vl53l0x. it gives an accurate measurement of the distance from an object in a narrow FOV and we can use that to extend to the rest of the camera FOV if done properly. this would to some extent avoid the tape measurement process at the cost of one sensor. either ways this calibration is a one time thing for a particular camera.

[@sanilalkuttimon1755]

❤️❤️❤️

[@user-bd5ou9rr6e]

the game is good

[@naeemtastic]

Hello, Random doubt but can we combine all code from every one of your video e.g : virtual keyboard, zoom gesture, etc..., can we combine all of them?

[@mohdshadab1755]

Can anyone help me to how to make this project and which software are use by admin . Can anyone help me pls pls

[@venkatesh2788]

Can you change into web app

[@learncse]

Help me solve this Error please. File "main.py", line 26, in if hands: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

[@rycke6252]

your 'hands' var is an vector/tuple/set ou dict, soo an 'if' operation is not permited since a vector can has multiple values: hands = [True, False] if hands: # the code should get in or out of if?

[@meghanair3789]

Does this project use Haar Cascades?

[@phuchothe7449]

Can I ask you something sir? Can I port this to arduino ?

[@mehdimbb3622]

Can i use mm for code??

[@rohanbarnwal5940]

Sir how to do it with face??

[@srezaziaee]

I could only install Mediapipe==0.8.10 and cvzone==1.5.6 packages in pycharm, it doesn't work for me on vscode or jupyter lab 1-don't forget to use python 3.7.6the default interpreter in your env 2-You can install 2 packages successfully settings >> project:xxx >> PythonInterpreter as Morteza demonstrated 3- This is really important to Downgrade protobuf to 3.20.1 (the last version up to now 4.21.1 doesn't match with mediapipe until now)

[@michaelderamus662]

I keep getting the following error message, and I'm not sure why. "TypeError("expected x and y to have same length")"

[@michaelderamus662]

I found the issue, I was missing an element in the 'y' dictionary.

[@rjgonzalez8108]

What camera is the "new" camera?

[@murtazasworkshop]

Canon m50

[@rjgonzalez8108]

@@murtazasworkshop Thanks

[@ShubyDuan]

This is not generalizable to different people. You calibrated the algorithm to basically the width of your hand. Distance measurements will be off for other people.

[@mehdimbb3622]

mm Milimetr Exampel= 21/34mm Or 24/67mm. . . . .

[@mehdimbb3622]

Hi bro Can i u give me this code??

[@Devlost_]

Sir I have a question...please help me sir....how can I add Open cv to my CCTV camera??please help sir please

[@majsur7441]

you cant just add it to cctv camera, but you can do it by having your cctv camera connected to the computer and use it as a camera

[@Devlost_]

@@majsur7441 okkk....I can access my CCTV by its software....

[@username-dh4tq]

×÷× : @@Devlost_

[@muhshamelahi3051]

lmList = hands[0]['lmList'] ~~~~~~~~^^^^^^^^^^ TypeError: list indices must be integers or slices, not str help me with this error

[@behcettas8533]

did you solve this problem?

[@frankchina2055]

too many values to unpack (expected 2) Bug why?

[@murtazasworkshop]

If you are getting an error getting the x and y value using hand['lmList'][8] then use hand['lmList'][8][:2] instead. This is because the latest version of cvzone consist to x,y,z values instead of only x,y. So you have to define that you only need the first two elements by adding [:2]

[@longle4030]

Has anyone here done this project yet?

[@kenichimori8533]

Bill Gates Banzai‼︎

[@nidhijain8618]

ho is your son what is his name

[@peacegtv7827]

Someone is already making a paper out of this tutorial and publishing it like its their own. 🤣🤣🤣 🤡🤡🤡

[@user-uh2cr9so8l]

Hand detection is hardly novel is it? Or is that the joke?

[@peacegtv7827]

@@user-uh2cr9so8l Its not a joke LOL some so called "AI Expert" from their local hometown is already trying to make a paper about this and present in a conference like IEEE LOL!!!