Add code + minimal README

.gitignore

+build

CMakeLists.txt

+cmake_minimum_required(VERSION 3.13)
+
+project(camera_calibration
+	LANGUAGES CXX
+)
+
+add_executable(camera_calibration
+	src/main.cc
+)
+
+find_package(OpenCV 4 QUIET)
+if(NOT OpenCV_FOUND)
+    find_package(OpenCV 3 REQUIRED)
+endif()
+target_link_libraries(camera_calibration ${OpenCV_LIBS})

LICENSE

+By downloading, copying, installing or using the software you agree to this license.
+If you do not agree to this license, do not download, install,
+copy or use the software.
+
+
+                          License Agreement
+               For Open Source Computer Vision Library
+                       (3-clause BSD License)
+
+Copyright (C) 2000-2019, Intel Corporation, all rights reserved.
+Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.
+Copyright (C) 2009-2016, NVIDIA Corporation, all rights reserved.
+Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved.
+Copyright (C) 2015-2016, OpenCV Foundation, all rights reserved.
+Copyright (C) 2015-2016, Itseez Inc., all rights reserved.
+Third party copyrights are property of their respective owners.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of the contributors
+    may be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is" and
+any express or implied warranties, including, but not limited to, the implied
+warranties of merchantability and fitness for a particular purpose are disclaimed.
+In no event shall copyright holders or contributors be liable for any direct,
+indirect, incidental, special, exemplary, or consequential damages
+(including, but not limited to, procurement of substitute goods or services;
+loss of use, data, or profits; or business interruption) however caused
+and on any theory of liability, whether in contract, strict liability,
+or tort (including negligence or otherwise) arising in any way out of
+the use of this software, even if advised of the possibility of such damage.

README.md

+cmake -B build -S . -DCMAKE_BUILD_TYPE=Release -G Ninja
+ninja -C build
+./build/camera_calibration config/top.xml
+./build/camera_calibration config/bottom.xml
\ No newline at end of file

config/live.xml

+<?xml version="1.0"?>
+<opencv_storage>
+<Settings>
+  <!-- Number of inner corners per a item row and column. (square, circle) -->
+  <BoardSize_Width> 8</BoardSize_Width>
+  <BoardSize_Height>5</BoardSize_Height>
+
+  <!-- The size of a square in some user defined metric system (pixel, millimeter)-->
+  <Square_Size>20</Square_Size>
+
+  <!-- The type of input used for camera calibration. One of: CHESSBOARD CIRCLES_GRID ASYMMETRIC_CIRCLES_GRID -->
+  <Calibrate_Pattern>"CHESSBOARD"</Calibrate_Pattern>
+
+  <!-- The input to use for calibration.
+		To use an input camera -> give the ID of the camera, like "1"
+		To use an input video  -> give the path of the input video, like "/tmp/x.avi"
+		To use an image list   -> give the path to the XML or YAML file containing the list of the images, like "/tmp/circles_list.xml"
+		-->
+  <Input>"0"</Input>
+  <!--  If true (non-zero) we flip the input images around the horizontal axis.-->
+  <Input_FlipAroundHorizontalAxis>0</Input_FlipAroundHorizontalAxis>
+
+  <!-- Time delay between frames in case of camera. -->
+  <Input_Delay>100</Input_Delay>
+
+  <!-- How many frames to use, for calibration. -->
+  <Calibrate_NrOfFrameToUse>13</Calibrate_NrOfFrameToUse>
+  <!-- Consider only fy as a free parameter, the ratio fx/fy stays the same as in the input cameraMatrix.
+	   Use or not setting. 0 - False Non-Zero - True-->
+  <Calibrate_FixAspectRatio> 1 </Calibrate_FixAspectRatio>
+  <!-- If true (non-zero) tangential distortion coefficients  are set to zeros and stay zero.-->
+  <Calibrate_AssumeZeroTangentialDistortion>1</Calibrate_AssumeZeroTangentialDistortion>
+  <!-- If true (non-zero) the principal point is not changed during the global optimization.-->
+  <Calibrate_FixPrincipalPointAtTheCenter> 1 </Calibrate_FixPrincipalPointAtTheCenter>
+
+  <!-- The name of the output log file. -->
+  <Write_outputFileName>"output/live.xml"</Write_outputFileName>
+  <!-- If true (non-zero) we write to the output file the feature points.-->
+  <Write_DetectedFeaturePoints>1</Write_DetectedFeaturePoints>
+  <!-- If true (non-zero) we write to the output file the extrinsic camera parameters.-->
+  <Write_extrinsicParameters>1</Write_extrinsicParameters>
+  <!-- If true (non-zero) we show after calibration the undistorted images.-->
+  <Show_UndistortedImage>1</Show_UndistortedImage>
+  <!-- If true (non-zero) will be used fisheye camera model.-->
+  <Calibrate_UseFisheyeModel>1</Calibrate_UseFisheyeModel>
+  <!-- If true (non-zero) distortion coefficient k1 will be equals to zero.-->
+  <Fix_K1>0</Fix_K1>
+  <!-- If true (non-zero) distortion coefficient k2 will be equals to zero.-->
+  <Fix_K2>0</Fix_K2>
+  <!-- If true (non-zero) distortion coefficient k3 will be equals to zero.-->
+  <Fix_K3>0</Fix_K3>
+  <!-- If true (non-zero) distortion coefficient k4 will be equals to zero.-->
+  <Fix_K4>1</Fix_K4>
+  <!-- If true (non-zero) distortion coefficient k5 will be equals to zero.-->
+  <Fix_K5>1</Fix_K5>
+</Settings>
+</opencv_storage>

output/.gitignore

+*
+!.gitignore