example-calibration crash after camera calibration

[paul-ferragut]

at the end of camera calibration I get an error OpenCV Error: Null pointer (Null pointer to reader or destination array) in cvReadRawDataSlice, file ......\modules\core\src\persistence.cpp line 3245

the crash is when the app is changing state from CAMERA to PROJECTOR_STATIC or when running in PROJECTOR_STATIC state with my cameraCalibration file , however if I try to run in PROJECTOR_STATIC state using your cameraCalibration file the app is not crashing. I might be doing something wrong in the camera calibration, please let me know if you have any suggestions, this addon looks awesome would love to manage to use it. thanks

[syn-kazuki-takata]

I faced the same problem and modified as follows to solve it.

In Calibration.cpp (in addons/ofxCv//libs/ofxCv/src), I changed fs << "[:" << imagePoints[i] << "]"; to fs << imagePoints[i];

If you use the code before modification, features was exported as follows in the calibrationCamera.yml. features: -[ [ 4.03665039e+02, 5.15171326e+02, 4.49520020e+02, 4.80329987e+02, ... 8.02705994e+02, 4.51542999e+02, 8.33743286e+02, 4.19411774e+02 ] ] -[ [ 1.45415695e+02, 4.51887360e+02, 1.97437866e+02, 4.21586609e+02, ... 5.50285950e+02, 4.28862122e+02, 5.90773010e+02, 3.98728363e+02] ]

and if you use the code modified, features: -[ 4.03665039e+02, 5.15171326e+02, 4.49520020e+02, 4.80329987e+02, ... 8.02705994e+02, 4.51542999e+02, 8.33743286e+02, 4.19411774e+02 ] -[ 1.45415695e+02, 4.51887360e+02, 1.97437866e+02, 4.21586609e+02, ... 5.50285950e+02, 4.28862122e+02, 5.90773010e+02, 3.98728363e+02]

[RZz96]

I faced the same problem and modified as follows to solve it.

In Calibration.cpp (in addons/ofxCv//libs/ofxCv/src), I changed fs << "[:" << imagePoints[i] << "]"; to fs << imagePoints[i];

If you use the code before modification, features was exported as follows in the calibrationCamera.yml. features: -[ [ 4.03665039e+02, 5.15171326e+02, 4.49520020e+02, 4.80329987e+02, ... 8.02705994e+02, 4.51542999e+02, 8.33743286e+02, 4.19411774e+02 ] ] -[ [ 1.45415695e+02, 4.51887360e+02, 1.97437866e+02, 4.21586609e+02, ... 5.50285950e+02, 4.28862122e+02, 5.90773010e+02, 3.98728363e+02] ]

and if you use the code modified, features: -[ 4.03665039e+02, 5.15171326e+02, 4.49520020e+02, 4.80329987e+02, ... 8.02705994e+02, 4.51542999e+02, 8.33743286e+02, 4.19411774e+02 ] -[ 1.45415695e+02, 4.51887360e+02, 1.97437866e+02, 4.21586609e+02, ... 5.50285950e+02, 4.28862122e+02, 5.90773010e+02, 3.98728363e+02]

Hi , since you had success to run the code. would you please tell me what are the steps to make it work? Many regards