qian256/hololenscamcalib

Programs to calibrate HoloLens front-facing camera, supporting HL1 and HL2

hololenscamcalib's Issues

No photo taken after pressing the space, no save

I don’t know why I pressed the button dozens of times and I took a picture
I have dealt with this problem now, but the image taken is mirrored

Question about "The intrinsics of HoloLens front-facing camera"

Hi @qian256!

In the README file, it shows that "The intrinsics of HoloLens front-facing camera is available with Windows UWP API".

I'm new to the development of HoloLens and can't find the the intrinsics of HoloLens front-facing camera, can you leave a link or something to help me find the resource?

Thank you very much!!!

Setup details

Hi,

could you provide some additional information on how to setup this project?
What versions of python/opencv/json are you using?
Is it necessary that the raw pictures are 896x504?

Thanks in advance.

Output error when running script

Hi,

I was now running your script on my Ubuntu 16.04 and get the following error

~/HoloLensCamCalib$ python calibrate.py --square_size 0.03 --pattern_width 7 --pattern_height 5 data1/raw/*.jpg
data1/raw/20170614_064153_HoloLens.jpg
processing data1/raw/20170614_064153_HoloLens.jpg... ok

RMS: 0.248947908729
camera matrix:
[[ 624.6142862 0. 683.96168577]
[ 0. 615.58413133 381.0986102 ]
[ 0. 0. 1. ]]
distortion coefficients: [ 0.01878055 -0.06607193 0.0011638 0.00460311 0. ]

Undistorted image written to: ./output/20170614_064153_HoloLens_chess.png_undistorted.png
libpng warning: Image width is zero in IHDR
libpng warning: Image height is zero in IHDR
libpng error: Invalid IHDR data

Do you know why this could be happening?

I have installed OpenCV 3.2.0 (following these instructions) and running with Python 3.5. I can see that the raw image is generated in the output folder, but there is an error with the undistorted image.

Thanks for the help!

how to get the center pixel of an image using opencv python?

Calibration patterns

Thanks for the great contributions for Hololens! I was now trying to use this project with my Hololens and was trying to find the "far" pattern you used online but couldnt manage. I found the "near" one though, in the artoolkit repo.

Thanks a lot for the help!

CalibrationFileGenerator Crashes if you try to run it in Windows with installed ARToolkit5

I compiled and ran the scripts/ARToolkitCalibrationFileGenerator.cpp. It crashes on this call
arParamObserv2Ideal(dist_factor, ox, oy, &ix, &iy, dist_function_version);

The problem in my installation is:

#define ARDOUBLE_IS_FLOAT

I am linking against the libs in the installed version for Windows (C:\Program Files (x86)\ARToolkit5\lib) and it crashes if you keep that define above.
So simply undefine that and change the code where it uses floats to ARdouble and it runs.

Calibration files for 1280x720

Hey,

Some really great info here! You would not happen to have the camera calibration files for 720p resolution of the HoloLens Webcam aswell?

Thanks,
Chris