Detecting color with Python and OpenCV using HSV colorspace

Detecting color with Python and OpenCV using HSV colorspace | Computer vision tutorial

Рет қаралды 53,218

Computer vision engineer

Жыл бұрын

Code: github.com/computervisioneng/...
#computervision #opencv #colordetection

Пікірлер: 104

@ComputerVisionEngineer 4 ай бұрын

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@iamrahiii 4 ай бұрын

I'm your big fan ,following since you have started channel. Now I'm unable to deploy my project live on github . Can you help me to live the project.

@Lux1431996 2 ай бұрын

This is so perfectly what I was looking for. Thank you so much! Might enable me to build a great production inline measurement system for "a penny".

@kiitanayandosu-ug7pe 2 ай бұрын

This was such an amazing tutorila thank you so much!

@John-xi2im Ай бұрын

superb tutorial, very informative and mind blowing!!

@richieora57 11 ай бұрын

so cool.thank you, learned a lot!

@ComputerVisionEngineer 11 ай бұрын

😃🙌

@drushtiladhani8370 9 ай бұрын

hey i am getting error in this line hsvImage = cv2.cvtColor(imageFrame, cv2.COLOR_BGR2HSV) please tell me how to solve cv2.cvtColor- in this

@ethaninfante2768 3 ай бұрын

Is there a way to display an array at the center of the webcam and if a certain color gets in that array it will send some sort of signal to a mechanism?

@muratakar1972 Жыл бұрын

Very useful tutorial, thanks.

@ComputerVisionEngineer Жыл бұрын

You are welcome! 😃🙌

@Mr3Run4Fun Жыл бұрын

How can I use my elgato capture card as the capture, I've tried looking everywhere?

@e1senvlr 4 ай бұрын

Cool explanation, thank you sir

@ComputerVisionEngineer 4 ай бұрын

You are welcome! Glad you enjoyed it! 😃🙌

@perth-ambhattarai4106 4 ай бұрын

Thannnk You!!!!!! That was smoooooooooothhhhhhhhhhh

@sanikashelke621 7 ай бұрын

instead of that i want the code to analyse the colour of my face, can you please guide??

@F4_TheBear 11 ай бұрын

did someone know the RGB value for grey things (type road, circuit, ...)

@dwaipayansarkar1815 Ай бұрын

In the get limits function c = np.uint8([[yellow]]) is throwing error

@zhongxina5808 10 ай бұрын

hey i tried to follow along with your tutorial but for some reason when i try to run it it says IndexError: index 10 is out of bounds for axis 0 with size 1 how can i fix this ?

@whlau6191 5 ай бұрын

Thank you! It is so concise! May I know could this be further refined to detect objects based on the criteria like shape (eg rectangle in different orientation) and size (eg pixel x pixel)? Thanks!

@ComputerVisionEngineer 5 ай бұрын

Yes, it can be done. You can further refine it to detect objects of a given color based on size and approx orientation. 🙌

@nikolaiownz 19 күн бұрын

Can you do a tutorial on how to regognise light a few colors light and the maybe log in into a excel for data to use. i want to make a uptime logger for my cnc machines

@selamushirtawi3909 2 ай бұрын

i am facing the following error cv2.error: OpenCV(4.6.0) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

@sanamakbari1370 22 күн бұрын

Thank you

@drushtiladhani8370 10 ай бұрын

How can i take pixels of other colors

@BaronBattles 6 ай бұрын

DO I NEED TO INSTALL VSCODE

@dwaipayansarkar1815 Ай бұрын

Your code is not properly working tho

@_Garm_ Жыл бұрын

like it, really cool video.. the kicker for me was the "BRG" .. it really confused me for a while.. was experimenting with the values there.. was trying to read the color of a led which i thought was green but was more white:ish with a green halo haha, is it possible to detect more colors at the same time ?

@ComputerVisionEngineer Жыл бұрын

Yeah, I hear you, something is tricky to specify the exact hue of a given color. About detecting more than one color at the same time: yes, absolutely! The code can be adapted to detect as many colors as you wish! 😃💪

@finnthehuman9889 Жыл бұрын

Hi , is that possible to add multiple boundary /square frame thingy to detect multiple object ?

@ComputerVisionEngineer Жыл бұрын

Hey, yes it is possible, you could try by getting the bounding boxes of all connected components, the same way I did in the parking spot detector and counter video. 💪🙌

@mohammadzamanzamani9775 10 ай бұрын

amazing video !

@ComputerVisionEngineer 10 ай бұрын

Thank you! 😃

@ecsyntric Жыл бұрын

this is better than pysource tutorial. how is it that all spanish guys are experts in CV? :)

@ComputerVisionEngineer Жыл бұрын

Lol 😂

@nikunjchauhan1332 7 ай бұрын

What is util here, it isn't available for me?

@RishiKumar-vb7fy 4 ай бұрын

Can we make something where camera detects the colour in traffic light and tells what colour is the light and it will assist the colourblind people if they are confused. Blinking yellow and blinking red is tough for them. It may be a good project.

@ComputerVisionEngineer 4 ай бұрын

Yeah it sounds like a good project idea! 🙌

@borallylyl8427 9 ай бұрын

Hello, I'm trying to create a program that detects and counts objects by color, but now I can only count four colors, these are red, blue, green and yellow. I wonder if I can add the whole color scale to the program, how can I do this? I will be very happy if you give back. have a nice day😊

@ComputerVisionEngineer 9 ай бұрын

Hey, I think adding the entire color scale to the program will be very challenging. I would suggest to add more colors incrementally until performance is affected. 🙌

@user-vl2rf7om1n 11 ай бұрын

Hi how can i connect the system to the alarm system specifically a buzzer while using a laptop camera for the video capturing, hope you will assist me

@sahilharal4206 2 ай бұрын

did you get it

@arifemreyaman2150 9 ай бұрын

Do you know which array value I should enter for red?

@bhavyan24 13 күн бұрын

did you find an answer?

@baohanquoc7644 18 күн бұрын

how to download util , sir

@user-hf6sz3bx8h 7 ай бұрын

Very useful tutorial, thank you! i would like to know how to make it work on black?

@ComputerVisionEngineer 6 ай бұрын

Have you tried by changing the bgr color to black (0, 0, 0)? Let me know if it works! 🙌

@brunomonteiro7340 10 ай бұрын

Very useful tutorial, thanks! I would like to know if you could help me with a project. Do you offer paid consulting? The concept of the project is to create a system for selecting and separating stones by shade of green using a Raspberry Pi with a camera. The system captures real-time images through the camera and processes these images to detect the green tones in the stones. Based on the shades of green detected, the stones are classified into different groups (1, 2, 3, 4) according to the defined shade scale. The image generated by the camera is displayed on a monitor, and each stone is marked with a square that indicates which group it belongs to.

@ComputerVisionEngineer 10 ай бұрын

Hey, I may create a paid consultation product soon. Do you need assistance with this project?

@DubinaStudio 8 ай бұрын

I'm thinking of a device in the form of a video camera. This device will consist of a RaspberryPi, a camera module and display. This device will demonstrate the operation of the program for participation in roboracing. I propose to create a team to work on this project. In the future, it will be possible to participate in the OpenCV AI Competition 2023+n with this project. From Uruguay, you can participate in the competition)

@ComputerVisionEngineer 8 ай бұрын

Sounds great! I think I won't be able to join, but best of luck with your project! 😃🙌

@idamfarhankhalik5299 Жыл бұрын

hello can you help me, i have some problem in here. i got message ModuleNotFoundError: No module named 'PIL'. how i can fix it?

@ComputerVisionEngineer Жыл бұрын

You may need to install Pillow. 'pip install Pillow' should do the work 💪💪

@freddieanniss3533 Жыл бұрын

Great video but I have a slight issue it says TypeError: VideoCapture() takes no arguments. I'm assuming this means its having trouble finding my webcam footage but I'm not sure how to fix it

@freddieanniss3533 Жыл бұрын

also the 2 in VideoCapture(2) shows up as an unexpected argument

@ComputerVisionEngineer Жыл бұрын

what opencv version are you using? what is your Python version and your OS? are you using an IDE?

@freddieanniss3533 Жыл бұрын

@@ComputerVisionEngineer im using Pycharm vers 3.11 on a windows. not sure what version of opencv it is i think its 22.3.1 if that sounds right.

@freddieanniss3533 Жыл бұрын

sorry no 4.6.0

@ComputerVisionEngineer Жыл бұрын

Please try to execute it without pycharm, also try with other Python version and other version of opencv.

@alinawabkhan7076 4 ай бұрын

How have you chosen a upper and lower limit? You have used some formula and I couldn't understand it?

@ComputerVisionEngineer 4 ай бұрын

The 'color' is given by the hue channel, so from the h value for yellow, I set the interval as +- 10.

@dzelctronics-dz8087 Жыл бұрын

i have a a problem sir when i try to detect a red color for example [0,0,255] it does not work ? i hope u reply and thanks

@ComputerVisionEngineer Жыл бұрын

Hey, maybe you need to try with different forms of red, as specified here www.rapidtables.com/web/color/red-color.html. Have you tried other colors?

@kailashramakrishnan7010 5 ай бұрын

Even small pixels of yellow are detected, from the background, how do I increase the priority to be for just the object

@ComputerVisionEngineer 5 ай бұрын

You could apply a blur to remove the small yellow pixels before applying the color detection.

@ecsyntric Жыл бұрын

awesome

@ComputerVisionEngineer Жыл бұрын

Glad you enjoyed it! 😄🙌

@shamirkhan6406 Жыл бұрын

Plz make a video on how to fix the media pipe installation error: "No matching distribution found for media pipe"

@ComputerVisionEngineer Жыл бұрын

Hey Shamir, please give me more details about your error. What Python version are you using? What is your OS?

@ibrahim.basaran 2 ай бұрын

i want to set up color for red. how ca i do it. i need little help

@wexxc9372 2 ай бұрын

Just set the color to red lol Just look up on the internet what's the BGR Colorspace of red

@studywithnadia121 Жыл бұрын

Hi. Free where i can get utul packages??

@ComputerVisionEngineer Жыл бұрын

Hey, what do you mean with 'utul packages'?

@karimmerchaoui9736 11 ай бұрын

when I tried red instead of yellow it didn't detect it even if I try different forms of red. I would really appreciate it if you help me

@ComputerVisionEngineer 11 ай бұрын

Hey, I took a look and there was a bug which affected the performance in the case of red hues, thank you for noticing it. It is fixed now, take a look at the repo. 💪🙌

@karimmerchaoui9736 11 ай бұрын

@@ComputerVisionEngineer It worked! thank you so much

@pasindukawshan5260 Жыл бұрын

Can I know what is this software using coding ?

@ComputerVisionEngineer Жыл бұрын

Hello Pasindu, I am not sure if I understand your question, what do you mean? In this video I show you how to detect colors using Python and OpenCV using the HSV colorspace.

@hxrted Жыл бұрын

pycharm

@cormiersierra9810 29 күн бұрын

太牛了...附送源代码....老哥你好...能做一个指定区域里的颜色识别监测不

@jeromewastijn5645 Жыл бұрын

how should i make it recognise the color red instead of yellow

@ComputerVisionEngineer Жыл бұрын

Hey Jerome, try defining a new variable called red = [0, 0, 255], and use that one instead of 'yellow'. If it doesn't detect the exact hue of red you are looking for you would have to see what are the bgr coordinates of the exact color you want to detect 💪🙌

@weaamajoor7420 Жыл бұрын

@@ComputerVisionEngineer Hey, I have tried using new variable to detect the red color but there is a problem. Did you managed to solve it?

@ComputerVisionEngineer Жыл бұрын

@@weaamajoor7420 what problem do you have when trying to detect the red color?

@weaamajoor7420 Жыл бұрын

@@ComputerVisionEngineer it stop tracking anything.

@dzelctronics-dz8087 Жыл бұрын

thankss

@ComputerVisionEngineer Жыл бұрын

😄🙌

@johanneskling2734 Жыл бұрын

Great Video! Could you tell me how the code performs

@ComputerVisionEngineer Жыл бұрын

Hey Johannes, I would say the color detection is performing very well! 😃💪

@johanneskling2734 Жыл бұрын

@@ComputerVisionEngineer do you think I could run it on a raspberry pi zero 😂

@ComputerVisionEngineer Жыл бұрын

As long as you can run Python, install OpenCV and get images from a webcam it 'should' work. If you try it on a raspberry pi let me know how it works! 💪

@johanneskling2734 Жыл бұрын

@@ComputerVisionEngineer yes it would be possible to run it but I would need at least 30fps which I don’t think is realistic on a weaker pi.

@microcontroller_garage5387 Жыл бұрын

very useful. How can i use this code to detect red color object

@ComputerVisionEngineer Жыл бұрын

Hey, define a new variable called red = [0, 0, 255] and use it instead of the 'yellow' variable. You may need to adjust the definition of red in case is not the exact hue of red you are looking for! 😃🙌

@microcontroller_garage5387 Жыл бұрын

@@ComputerVisionEngineer i tried with a new variable. But hue value is the problem I think. Thanks for the reply

@weaamajoor7420 Жыл бұрын

@@microcontroller_garage5387 Hey, I have tried using new variable to detect the red color but there is a problem. Did you managed to solve it?

@stu.5903 Жыл бұрын

How do you put a circle dot in the middle of the lemon/color? I'm trying to create a posture and gait analysis thesis with colored markers and get measurements (angles/distance), I want to be able to detect it and put a point in the middle of each markers and connect each point with lines. Hoping for your response, thanks in advance!

@ComputerVisionEngineer Жыл бұрын

Hey, about the circle take a look at cv2.circle function, you can compute the coordinates of the center of the color by inspecting the bounding box coordinates. 🙌

@sir.blobfish1528 4 ай бұрын

Hey! Not sure if you still need the code but here it is anyway: if bbox is not None: x1, y1, x2, y2 = bbox cv2.rectangle(frame, (x1, y1), (x2, y2), [0, 255, 0], 5) center_x = (x1 + x2) // 2 center_y = (y1 + y2) // 2 frame = cv2.circle(frame, (center_x, center_y), 0, (0, 0, 255), 5) # change the 5 to adjust thickness just replace the if statement where you draw the rectangle and there should now me a circle in the middle of the object

@sergeysaik7975 Жыл бұрын

Hey, is it possible to make it so the code runs the tracking on screen? Im trying to make an extension that runs on my pc on top of all my apps to track certain colors for premiere keyframes. Im not that skilled in coding so was hopping for a little help.

@ComputerVisionEngineer Жыл бұрын

Hey Sergey, you want to track colors in your screen? Sure, it is possible, I guess the code in this project is a good baseline for that. Take a look at PyAutoGUI library, you can use it to take screenshots, for example. 💪💪

@azzamalomari9025 8 ай бұрын

Hi, i need to make a robot that can avoid green and red obstacles. when the robot detect the green obstacle it should go left and when it sees red obstacle it should go right. and I am kinda lost how to make the camera program, can you help me?🥲

@ComputerVisionEngineer 8 ай бұрын

Hey, are you working with Arduino? If you are, search for videos on 'arduino color sensor project', there are plenty of videos on youtube which cover the foundations of how to do it. 🙌