Camera Calibration in less than 5 Minutes with OpenCV

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Camera Calibration Software and High Precision Calibration Boards: camera-calibrator.com/
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Camera Calibration Software and Boards: camera-calibrator.com
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In this video 📝 We'll talk about Camera Calibration and Geometry. We will first talk about the basics of camera geometry and how it can be used for calibrating cameras. We will see different types of distortion on cameras and images. At the end of the video, I'll show you in a Python script how to apply what we have learned and calibrate a camera from a practical computer vision setup.
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My camera calibration software, CharuCo Boards, and Checker boards
Link to webshop: camera-calibrator.com
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#CameraCalibration #CameraCalibrationOpenCV #CameraDistortion #ComputerVision #OpenCV #Python

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Опубликовано:

19 фев 2023

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Комментарии : 47

@NicolaiAI Год назад

Camera Calibration Software and High Precision Calibration Boards: camera-calibrator.com/

@maddiebender1413 Месяц назад

Can you show a link to the calibration image you used? Also, is the frame size in mm?

@JReinhoud Год назад

Just curious, isnt ChArUco a better pattern for calibration?

@lilyshytle393 9 месяцев назад

Hello! When I run the code, I am getting the error message: [ WARN:0] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (438) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback Any advice?

@cyberhard Год назад

What is the link for the longer calibration video? Does a camera need to be calibrated? What is the value in calibration?

@NicolaiAI Год назад

This is the link for the longer video: Camera Calibration in Python with OpenCV - Python Script with Images ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3h7wgR5fYik.html U don’t have to calibrate it but can be used to remove distortion and get the intrinsic parameters of the camera which can be used for many things

@cyberhard Год назад

@@NicolaiAI Thanks for the response.

@bellomayowa6993 Год назад

Hello, How often do we need to do camera calibration. once per camera or for everytime you move the camera

@NicolaiAI Год назад

Just once per camera if u are only interested in the intrinsic parameters

@bellomayowa6993 Год назад

@@NicolaiAI thank you so much. I really appreciate it

@NicolaiAI Год назад

@@bellomayowa6993 ur welcome

@kevinwoodrobotics 11 месяцев назад

It depends on your application. If your camera is under extreme environment conditions or if you want very precise accuracy, you may need to calibrate your camera more frequently since your intrinsic camera parameters could potentially change over time. Temperature changes can often cause physical changes to your camera. But if you are using it in very controlled environment and accuracy is not super important, you may get away with only calibrating once.

@aswinsanthanam2566 4 месяца назад

I took the chessboard pic from my phone which is 8x8, and the frame WxH was 480x270, hence i updated these infos in the calibration.py. I get the below error (-215:Assertion failed) nimages > 0 in function 'calibrateCameraRO' on the line ret, cameraMatrix, dist, rvecs, tvecs = cv.calibrateCamera(objpoints, imgpoints, frameSize, None, None). Any idea ?

@NicolaiAI 4 месяца назад

Images are not loaded in correctly

@ArvindKumar-qh8sg Год назад

what is the unit of the mean error given in the result? Thanks!

@NicolaiAI Год назад

It’s pixels from the reprojection

@FassiaOuanre 3 месяца назад

good evening how are you? I'm studying on a school project and I need to calibrate the camera I'm using. So I followed your tutorial then I retrieved your script from your git account, now I have a problem when I execute the code. I have an error regarding this part: img = cv.imread('cali5.png') h, w = img.shape[:2] newCameraMatrix, king = cv.getOptimalNewCameraMatrix(cameraMatrix, dist, (w,h), 1, (w,h)) Here is the error that appears: AttributeError: 'NoneType' object has no attribute 'shape' I'm asking for your help. Good evening.

@alessandramenezes4813 2 месяца назад

Did you solve this problem? how?

@rangowang9432 2 месяца назад

img = cv.imread('cali5.png') you should use your existing picture and make sure the path is right. like: "img = cv.imread('xxx/xxx.png')"

@01Hesenko06 Год назад

1. don't you have to take into account the pixel density on each device when creating a checkerboard pattern? Or what do you have to take into account? 2. where can one create a suitable checkerboard pattern?

@NicolaiAI Год назад

No the pixel density doesn’t really matter. Just make sure u are able to detect the corners correctly and maybe use some sub pixel/corner refinement. U can just download checkerboards on google. There are some generators

@luisjomen2aS 11 месяцев назад

Wouldn't it mean that you zooming in would alter the size of the checkerboard and thus biased the tangential distortion ?@@NicolaiAI

@shortylikeamelody Год назад

Hi, thanks for the video. I'm trying to run your program on my dataset (11 photos taken from a GoPro MAX) but the 'ret' boolean always stays at false so the chessboard is never detected. The images are well read by the program, any clue why this problem occurs ?

@kevinwoodrobotics 11 месяцев назад

You may want to play around with how close or far your chessboard is to your camera

@cpuwolf Год назад

it was a headache where to get chessboard, iPad is definitely a easy way to go

@NicolaiAI Год назад

Yeah for sure! Or u can also just print out one

@user-gj5vh6ry8n 8 месяцев назад

is it really required to have the chessboard? I have been trying other images, the code just not work with other images

@NicolaiAI 8 месяцев назад

Nope this specific code needs to be with a chessboard and is also the easiest by far. You can just print a chessboard or even just try out with one in your phone or tablet

@saadsaad17 Год назад

Should not the chessboardSize be equal to (10,7)?

@NicolaiAI Год назад

Nope u should specify the number of corners in the chessboard in each row and column

@saadsaad17 Год назад

@@NicolaiAI The chessboard displayed on the tablet screen has 10 corners and 7 corners in each row and column respectively. Great work on your videos btw, they are helpful and well organized, keep it up :D

@rafaelsouza4575 6 месяцев назад

for some reason, opencv only takes into account the inner borders of the chessboard, such the final number is always one less than the original count of rows and cols.

@rangowang9432 2 месяца назад

Hi, bro . I have tried your code with about 15 pictures and everything is going well. But the total error is too much high, my error is 0.236623....! It;s just so much high and I think the cameramtx and dist are not accurate enough in this way. Can you give me some suggestions about how can I have the same small error like you have showed in your video. Thanks.

@rayanelahmadi3543 Месяц назад

Same issue here

@kanangurbanov8282 Год назад

Could you please explain how to do it with 24 color card? I need to calibrate it with these 24 colors , not with chessboard

@notnotalwen4891 11 месяцев назад

if the pattern is checkered, count the size of the board, so if your board is like 24x24 the chess size is 23x23, or if your board is 24x20 the chess size is 23x19, hope you see the pattern here

@paweskrzypczak1650 Год назад

What is the camera?

@NicolaiAI Год назад

Just a standard cheap webcam haha

@0xc026 Год назад

what is img = cv.imread('cali5.png')?

@ScottFoust Год назад

I was stuck on this for a while as well. If you watch his video closely, you'll notice that is just the name of one of his calibration images. Just rename it to one of your own.

@gokcesenahocaoglu8631 11 месяцев назад

@@ScottFoust Hello, I am also having the same problem. Can you tell me how to get the calibration images?

@engchoontan8483 7 месяцев назад

Target = objective-purpose For each objective-purpose = Audio soft-limit(min-max) hard-limit(min-max) slope(min-max) = Video focus hunt-track(min-max) gradation-slope(min-max), focus(min-max) gradation-slope(min-max) Nowadays, digital rubbish looks really bad on TV, even professional camera and professional studio. Digital camera with old manual lens with hands-brains for those missing parameters should make the hunting-focus less zombie-jumping lousy.

@engchoontan8483 7 месяцев назад

There is the gimbal and record at 2k to post-process to 1080p as digital-stabilization. There is no optical stabilization in my books. I am not a zombie. For military, hunt and track and other layers should be drag drop priority-table.

@engchoontan8483 7 месяцев назад

Real time with - it's complicated, I don't know, anything, ... Apply to men.

@engchoontan8483 7 месяцев назад

Apache helmet with Lidar and artillery calculator and construction civil engineering 3D modelling and range-finder scope tech is useless to such people. Add helmet with Range(min-max), slope(min-max), if you think millennials are smarter.

@engchoontan8483 7 месяцев назад

2 rectangle is keystone compensation for data discard shift. Bellows in old-school terminology.

@engchoontan8483 7 месяцев назад

Baseline target-board = old cartoon for analog paper tune = Japanese anime for color proofing = China MMonline games for response-time of processor and pixels = Korean MMo for bandwidth and network of smart TV-monitor = Movies CGI titanic for the point when SGI lot to Linix-beowulf-culsters = American animation movies for DVD and Blu ray = Focusing issues not present in cartoons for kids before-after year ... Always...