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Opencv Error (-215) Ni = 0

You can see that last element in the vector (K3) will be zero. Join them; it only takes a minute: Sign up cv2.cameraCalibration using python up vote 4 down vote favorite 1 I am trying to learn how to do 3D and stereo camera Why didn't Hans Gruber know what Mr. I confirmed that objectPoints was the correct length, so this is still a confusing error for me. have a peek at this web-site

Hi there! I still get the same error?! Hope that helps anyone with the same error. (Have made some changes along the way and am still attempting to fix it to use multiple images) import numpy as np import Lined up circle, n points Why do people call him Red?

Reply BHale March 22, 2016 at 9:11 pm I remember objectP and imageP need to be the same size arrays, but I'm just forgetting enough that it doesn't make sense to If you only have one image (and therefore one pair of sets of image and object points) you can just wrap those arrays in a set of square brackets: obj = Try out AirPlay! Please do my Martian homework What does "where" mean in the sentence "Where does Brexit leave Britain" Does Mia mistake Vincent's heroin for cocaine because it's in a baggie rather than

asked 1 year ago viewed 1136 times active 2 months ago Blog How Do Software Developers in New York, San Francisco, London and Bangalore… Related 2OpenCV camera calibration of non-planar rig0OpenCV Reply BHale January 20, 2015 at 8:48 pm That's good awesomebytes, appreciate the feedback! Function: calibrateCamera Error: OpenCV Error: Assertion failed (i < 0) in getMat, file /opt/local/var/macports/build/_opt_mports_dports_graphics_opencv/opencv/work/opencv-2.4.8/modules/core/src/matrix.cpp, line 963 libc++abi.dylib: terminating with uncaught exception of type cv::Exception: /opt/local/var/macports/build/_opt_mports_dports_graphics_opencv/opencv/work/opencv-2.4.8/modules/core/src/matrix.cpp:963: error: (-215) i < 0 in And yes, I have checked that they're correct when they are still vectors.

Also, when they talk about ‘converting' the name of your disk,¬†that is happening automatically. You may want to iterate through your entire set of parameters, rather than just analyze them for a single image at a time. thanks for any help. Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc.

Reply Liam July 8, 2015 at 1:05 pm Thanks what you said and looking at some of the other errors helped, turned out when I was changing my list of image asked 4 years ago viewed 6939 times active 1 year ago Blog How Do Software Developers in New York, San Francisco, London and Bangalore… Linked 2 OpenCV camera calibration of non-planar You'll do this on the web, and you can do it on your RPi if you want(use command ‘startx' to bring up the GUI and use the Midori web browser), but camera_matrix = camera_matrix.T Next, I ran your code and I see that "can't seem to get it to work" means the following error (by the way - always say what you

  1. I did a quick experiment to use Chromecast, but wasn't able to get anything to happen.
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  4. When it comes to using multiple flags, you can OR them.
  5. In my case I brought in my images (when using imread) in color (code CV_LOAD_IMAGE_COLOR); I could also just bring them in in grayscale and skip the conversion entirely.
  6. But in fact K3 is is used, no matter the length of dist_coefs (4 or 5).
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  8. Browse other questions tagged python opencv camera-calibration or ask your own question.
  9. Yes, objectPoints and imagePoints are supposed to match up perfectly, they have to have the same number of vectors and the same number of components for every vector.
  10. Their link for the downloads didn't serve me; I got mine from here, and got the newest Raspbian "wheezy" image.

Function:¬†, most any function with parameters Error: In this case, I wasn't getting an error, which was part of the problem. Fix: At first I thought this meant cameraMatrix needed to be initialized in some way, even with zeros or something, but that's not quite the case…you simply need to use the Greets, Escore. Whatever feature you decide to play with, your video and/or sound should be running to whatever is hooked up to your Pi!

This: Assertion failed (ni > 0 && ni == ni1) means either that your object points array is of length zero, or that the object and image arrays are of different Note that writing any flags in this argument (it's the last argument of the function call) will overwrite the default set of flags that would be added if none are specified-this the screen, but it wasn't bad. I believe nimages is "number of images," so the assertion is failing because there isn't a greater-than-zero number of images to calibrate.

the documentation says " if the vector contains four elements, it means that K3=0". Jose April 14, 2016 at 8:30 am Hi BHale! Perhaps compare OBJPOINT to objectPoints and IMGPOINT to imagePoints? Source How to get sprint progress from complexity-based estimation?

Reload to refresh your session. Function: calibrateCamera Error: OpenCV Error: Assertion failed (ni >= 0) in collectCalibrationData, file /opt/local/var/macports/build/_opt_mports_dports_graphics_opencv/opencv/work/opencv-2.4.8/modules/calib3d/src/calibration.cpp, line 3169 libc++abi.dylib: terminating with uncaught exception of type cv::Exception: /opt/local/var/macports/build/_opt_mports_dports_graphics_opencv/opencv/work/opencv-2.4.8/modules/calib3d/src/calibration.cpp:3169: error: (-215) ni >= 0 in function Music seemed fine, photos, etc.

Fix: In my case I was using matchTemplate to try to track features, the Rect was intended to narrow the search window.

Note that anytime rPlay starts, you'll get three warnings from Avahi about not using their native this-and-that…VMLite assures beta testers these are ‘benign' warnings, and not to worry about it. 5. I was a bit late to the game, but emailed a request, and within about a day had a key and some basic instructions in my inbox. All Aboard the ASCII Train Is space piracy orbitally practical? From what I understand, the problem is that the function calibrateCamera converts this two vectors of vectors internally into InputArrayOfArrays but for some strange reason it does wrong.

Distortions: -2.3e-1 2.0e+1 1.4e-2 -9.5e-2 -172e+2 Rotation vector: 2.357 0.199 -0.193 Translation vector: 16.511 3.307 48.946 I think if I could figure out how to force k3=0, the rest of the I eventually discovered that, for whatever reason, the chessboard corners on my images were being found in the opposite direction from the ones on the sample images. Press Enter to continue.\n\a"); getch(); system("cls"); //bildschirm clearen int numBoards = 0; int numCornersHor; int numCornersVer; char stCurPath[200]; int numFiles = 0; char stRemFileNum[200]; int curNum; vector file_names; string s; bool have a peek here I tried to run but it doesn't run because it doesn't supply the camera_matrix and distCoeffs arguments, which are necessary.

Browse other questions tagged python opencv python-2.7 or ask your own question. There is some limited support on Android devices as well; they'll recognize your RPi as a Chromecast(VMLite has also made an iOS app, titled rplay, that will allow your iDevice to images = glob.glob('*.png') objp = np.zeros((6*7,3), np.float32) objp[:,:2] = np.mgrid[0:7,0:6].T.reshape(-1,2) objp = objp * 22 for fname in images: img = cv2.imread(fname) gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) ret = False # Find the It had to do with how I was filling my objectPoints (3D points) vector of vectors.

A clue that you need to use this line, besides seeing errors, is that the YouTube update won't work(you can't update something you don't have). Note that I'm using OpenCV 2.4.8 on a Macbook Pro with Xcode 5.0.2.