2020-01-16 04:46:55 -0600 received badge ● Popular Question (source) 2019-10-09 06:56:30 -0600 received badge ● Notable Question (source) 2018-10-30 17:02:50 -0600 received badge ● Popular Question (source) 2017-12-22 05:07:09 -0600 commented question Camera calibration I have a dataset of around 250 images, from different angles. I used the default calibrate function from opencv and cali 2017-12-21 04:51:09 -0600 asked a question Camera calibration Camera calibration Hi, I'm using the default camera calibration from opencv to calibrate a Raspberry pi camera. I ran t 2017-11-15 01:52:38 -0600 commented answer Marker pose calculation with solvepnp @Tetragramm you're been really helpfully! But one last question, does the order of the points need to be same always? Fo 2017-11-14 05:00:20 -0600 commented question HoughLinesP not able to detect lines @ziri that's what I'm trying now. Do you know a way to detect if a boundingrect has boundingrects inside? 2017-11-14 02:54:48 -0600 commented question HoughLinesP not able to detect lines I edited the post 2017-11-14 02:54:12 -0600 received badge ● Editor (source) 2017-11-14 02:54:12 -0600 edited question HoughLinesP not able to detect lines HoughLinesP not able to detect lines Hi, I have been struggling with detecting straight lines with HoughLines() after I 2017-11-13 11:15:28 -0600 asked a question HoughLinesP not able to detect lines HoughLinesP not able to detect lines Hi, I have been struggling with detecting straight lines with HoughLines() after I 2017-11-13 06:18:28 -0600 commented answer Marker pose calculation with solvepnp So if I'm correct for the objectPoints I have to create an array of the different points of interests. And for example i 2017-11-13 06:17:38 -0600 commented answer Marker pose calculation with solvepnp So if I'm correct for the objectPoints I have to create an array of the different points of interests. And for example i 2017-11-13 02:56:54 -0600 received badge ● Enthusiast 2017-11-12 17:13:49 -0600 asked a question Marker pose calculation with solvepnp Marker pose calculation with solvepnp Hi, I'm trying to get my rectangular marker pose via the solvepnp() function. It 2017-11-12 13:26:47 -0600 received badge ● Student (source) 2017-11-12 12:57:14 -0600 commented question Detecting marker Thank you, I will look into that! I already use them and i know how awesome they are, but some people say I have to thin 2017-11-12 11:52:21 -0600 asked a question Detecting marker Detecting marker Hi, What is the best way to detect a self-made marker? The marker will be an black rectangle stroke wi 2017-11-12 11:25:09 -0600 marked best answer Kalman filter matrices Hi, I'm working with a kalman filter but I can't figure out or can't find documentation about the different matrices. I'm wondering what the values of the next matrices must be: setIdentity(KF.measurementMatrix); setIdentity(KF.processNoiseCov, Scalar::all(1e-5)); setIdentity(KF.measurementNoiseCov, Scalar::all(1e-1)); setIdentity(KF.errorCovPost, Scalar::all(1));  Thanks! 2017-11-06 10:14:40 -0600 asked a question Kalman filter matrices Kalman filter matrices Hi, I'm working with a kalman filter but I can't figure out or can't find documentation about th 2017-10-26 15:40:56 -0600 commented question Aruco marker coordinates on frame I want to print the 4 points 2017-10-26 08:53:25 -0600 asked a question Aruco marker coordinates on frame Aruco marker coordinates on frame Hi, I'm searching for an easy way to get the coordinates of the detected aruco marker 2017-10-09 06:53:31 -0600 received badge ● Supporter (source) 2017-10-09 06:53:30 -0600 marked best answer OpenCV camera calibration error: OpenCV Error: Unknown error code -49 (Input file is empty) in cvOpenFileStorage I'm trying to calibrate my PICamera with the camera_calibration.cpp sample. I have taken 6 images from the sample chessboard. cmake and make work, but after running camera_calibration got the following error: ./camera_calibration default.xml This is a camera calibration sample. Usage: calibration configurationFile Near the sample file you'll find the configuration file, which has detailed help of how to edit it. It may be any OpenCV supported file format XML/YAML. OpenCV Error: Unknown error code -49 (Input file is empty) in cvOpenFileStorage, file /tmp/binarydeb/ros-kinetic-opencv3-3.2.0/modules/core/src/persistence.cpp, line 4422 terminate called after throwing an instance of 'cv::Exception' what(): /tmp/binarydeb/ros-kinetic-opencv3-3.2.0/modules/core/src/persistence.cpp:4422: error: (-49) Input file is empty in function cvOpenFileStorage Aborted (core dumped)  Google doesn't want to give me an answer this time, hope someone else does. I used this http://docs.opencv.org/2.4/doc/tutorials/calib3d/camera_calibration/camera_calibration.html guide. I have all the files, images,... in 1 folder. default.xml  9 6 27 "CHESSBOARD" "VID5.xml" 0 100 26 1 1 1 "out_camera_data.xml" 1 1 1  VID5.xml