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Fixed issues on the new README file.
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‎README.md

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@@ -5,18 +5,18 @@ Demos related to **OpenGL**, **Qt/QML**, **OpenCV** and other X technologies.
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Demo | Description | Screenshot
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----------------------------------|----------------------------------------|----------------------------------------
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**cvDisplacementMapFilter** | C++ implementation of Displacement Map Filter in OpenCV that renders two images as a movie clip. | <img src="cvDisplacementMapFilter/screenshot.gif" width="200" height="150"/>
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**cvFruitClassification** | C++/OpenCV port of [a cool Python application](http://github.com/eliezerb/FruitClassification) that performs Oranges vs Apples classification using LDA. | <img src="cvFruitClassification/screenshot.jpg" width="200" height="185"/>
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**cvImage** | C++/Qt/OpenCV example that displays an image and the RGB values of a pixel based on mouse coordinates. | <img src="cvImage/screenshot.jpg" width="200" height="150"/>
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**cvQTcameraGL** | Demonstrates how to use OpenCV to retrieve frames from the default camera and display them on Qt with native OpenGL. | <img src="cvQTcameraGL/screenshot.jpg" width="200" height="150"/>
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**cvVideo** | Demonstrates how to use OpenCV/Qt to display video files with configurable Aspect Ratio. | <img src="cvVideo/screenshot.gif" width="250" height="130"/>
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**cvWatershedSegmentation** | [Stackoverflow example](https://stackoverflow.com/a/25851951/176769) that uses OpenCV's watershed segmentation with distance transform to segment beans. | <img src="cvWatershedSegmentation/screenshot.jpg" width="200" height="200"/>
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**ipcQtGesture** | A Qt application that uses the old *Intel® Perceptual Computing SDK 2013* for gesture recognition. Windows only. | No image available
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**qmlBattery** | A QML Battery element that displays the amount of energy left as horizontal bars according to the charge. On this demo, the charge is set dynamically and randomly from the C++ side. | <img src="qmlBattery/screenshot.gif" width="200" height="180"/>
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**qtArduinoSerial** | An application that prints data from a serial (COM) port connected to an Arduino. | No image available
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**qtFPSvsTIMEAnimation** | A Qt implementation of FPS-based and Time-based animation techniques, as explained by [Steven Lambert](http://blog.sklambert.com/using-time-based-animation-implement/) | <img src="qtFPSvsTIMEAnimation/screenshot.gif" width="200" height="280"/>
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**qtKinectVideo** | An application based on "Color Basics" from Kinect for Windows SDK 1.8. This demo shows how to display the Color Stream on your Qt application. | No image available
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**qtLinearRegressionGD** | A C++/Eigen implementation of Linear Regression based on [Daniel Shiffman's tutorials](https://www.youtube.com/watch?v=szXbuO3bVRk). Data is plotted with [Madplotlib](https://github.com/madplotlib/madplotlib) | <img src="qtLinearRegressionGD/screenshot.jpg" width="200" height="130"/>
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**qtLogoBlurGL** | A Qt/OpenGL demo that renders a logo on a texture and performs a blur for glow. | <img src="qtLogoBlurGL/screenshot.jpg" width="200" height="150"/>
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**qtSmoothColorTransition** | A Qt application that takes a grayscale image and performs a smooth color transition using a predefined color palette for linear interpolation. | <img src="qtSmoothColorTransition/screenshot.jpg" width="200" height="200"/>
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**cvDisplacementMapFilter** | A Displacement Map Filter implemenatation in C++/OpenCV that renders two images as a movie clip. | <img src="cvDisplacementMapFilter/screenshot.gif" width="200"/>
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**cvFruitClassification** | C++/OpenCV port of [a cool Python application](http://github.com/eliezerb/FruitClassification) that performs Oranges vs Apples classification using LDA. | <img src="cvFruitClassification/screenshot.jpg" width="200"/>
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**cvImage** | C++/Qt/OpenCV example that displays an image and the RGB values of a pixel based on mouse coordinates. | <img src="cvImage/screenshot.jpg" width="200"/>
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**cvQTcameraGL** | Just another demo on how to use C++/OpenCV to retrieve frames from the camera and draw them in a Qt widget using an OpenGL context for GPU rendering. | <img src="cvQTcameraGL/screenshot.gif" width="200"/>
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**cvVideo** | A C++/OpenCV/Qt example on how to display video files with configurable Aspect Ratio. | <img src="cvVideo/screenshot.gif" width="200"/>
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**cvWatershedSegmentation** | [Stackoverflow answer](https://stackoverflow.com/a/25851951/176769) that uses C++/OpenCV's watershed segmentation with distance transform to segment beans. | <img src="cvWatershedSegmentation/screenshot.jpg" width="200"/>
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**ipcQtGesture** | A C++/Qt application that uses the old *Intel® Perceptual Computing SDK 2013* for gesture recognition. Windows only. | No image available
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**qmlBattery** | A Qt/QML Battery element that displays the amount of energy left as horizontal bars according to the charge. On this demo, the charge is set dynamically and randomly from the C++ side. | <img src="qmlBattery/screenshot.gif" width="200"/>
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**qtArduinoSerial** | An C++/Qt example on how to print data from a serial (COM) port connected to Arduino. | No image available
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**qtFPSvsTIMEAnimation** | A C++/Qt implementation of FPS-based and Time-based animation techniques, as explained by [Steven Lambert](http://blog.sklambert.com/using-time-based-animation-implement/) | <img src="qtFPSvsTIMEAnimation/screenshot.gif" width="180"/>
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**qtKinectVideo** | C++/Qt application based on "Color Basics" from Kinect for Windows SDK 1.8. This demo shows how to display the Color Stream. | No image available
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**qtLinearRegressionGD** | A C++/Eigen implementation of Linear Regression based on [Daniel Shiffman's tutorials](https://www.youtube.com/watch?v=szXbuO3bVRk). Data is plotted with [Madplotlib](https://github.com/madplotlib/madplotlib) (Qt required). | <img src="qtLinearRegressionGD/screenshot.jpg" width="200"/>
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**qtLogoBlurGL** | A silly C++/Qt/OpenGL demo that renders a logo on a texture and performs a blur for glowing purposes. | <img src="qtLogoBlurGL/screenshot.jpg" width="200"/>
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**qtSmoothColorTransition** | A C++/Qt application that takes a grayscale image and performs a smooth color transition using a predefined color palette based on linear interpolation. | <img src="qtSmoothColorTransition/screenshot.jpg" width="200"/>
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‎cvQTcameraGL/main.cpp

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/* Copyright (C) 2013 Karl Phillip Buhr <[email protected]>
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/* Copyright (C) 2013-2020 Karl Phillip Buhr <[email protected]>
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*
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* This work is licensed under the Creative Commons Attribution-ShareAlike License.
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* To view a copy of this license, visit:

‎cvQTcameraGL/screenshot.jpg

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‎cvQTcameraGL/widget.h

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/* Copyright (C) 2013 Karl Phillip Buhr <[email protected]>
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/* Copyright (C) 2013-2020 Karl Phillip Buhr <[email protected]>
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*
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* This work is licensed under the Creative Commons Attribution-ShareAlike License.
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* To view a copy of this license, visit:

‎cvQtCameraGL/cvQTcameraGL.pro

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QT += core gui opengl
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contains(QT_VERSION, ^5\\.[0-8]\\..*) {
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message("* Using Qt $${QT_VERSION}.")
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QT += widgets
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# On my system I have to specify g++ as compiler else it will use clang++ by default
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#QMAKE_CXX=g++
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#QMAKE_CC=gcc
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}
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SOURCES += \
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main.cpp \
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widget.cpp
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HEADERS += \
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widget.h
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## OpenCV settings for Unix/Linux
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unix:!mac {
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message("* Using settings for Unix/Linux.")
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INCLUDEPATH += /usr/local/include/opencv
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LIBS += -L/usr/local/lib/ \
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-lopencv_core \
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-lopencv_highgui \
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-lopencv_imgproc
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}
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## OpenCV settings for Mac OS X with OpenCV 3.1
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macx {
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message("* Using settings for Mac OS X.")
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# Solve imwrite() undefined symbol
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QMAKE_CXXFLAGS += -stdlib=libc++
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INCLUDEPATH += "/usr/local/opt/opencv3/include"
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LIBS += -L"/usr/local/opt/opencv3/lib" \
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-lopencv_core \
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-lopencv_highgui \
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-lopencv_imgproc \
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-lopencv_imgcodecs \
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-lopencv_videoio \
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-lc++
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}
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## OpenCV settings for Windows and OpenCV 4.5.0
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win32 {
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message("* Using settings for Windows.")
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INCLUDEPATH += "C:\\opencv\\build\\install\\include" \
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"C:\\opencv\\build\\install\\include\\opencv2" \
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LIBS += -lopengl32
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CONFIG(debug, debug | release) {
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LIBS += -L"C:\\opencv\\build\\install\\x64\\vc16\\lib" \
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-lopencv_core450d \
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-lopencv_highgui450d \
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-lopencv_imgproc450d \
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-lopencv_imgcodecs450d \
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-lopencv_videoio450d
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# Projects > Build & Run > Run
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# Check: add build library search path to PATH
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# This allows OpenCV DLLs to be found when running this application
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LIBS += -L"C:\\opencv\\build\\install\\x64\\vc16\\bin"
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}
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CONFIG(release, debug | release) {
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LIBS += -L"C:\\opencv\\build\\install\\x64\\vc16\\lib" \
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-lopencv_core450 \
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-lopencv_highgui450 \
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-lopencv_imgproc450 \
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-lopencv_imgcodecs450 \
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-lopencv_videoio450
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# Projects > Build & Run > Run
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# Check: add build library search path to PATH
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# This allows OpenCV DLLs to be found when running this application
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LIBS += -L"C:\\opencv\\build\\install\\x64\\vc16\\bin"
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}
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}

‎cvQtCameraGL/main.cpp

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/* Copyright (C) 2013-2020 Karl Phillip Buhr <[email protected]>
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*
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* This work is licensed under the Creative Commons Attribution-ShareAlike License.
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* To view a copy of this license, visit:
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* https://creativecommons.org/licenses/by-sa/2.5/legalcode
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*
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* Or to read the human-readable summary of the license:
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* https://creativecommons.org/licenses/by-sa/2.5/
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*/
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#include <QApplication>
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#include "widget.h"
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int main(int argc, char* argv[])
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{
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QApplication app(argc, argv);
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// For OpenGL Graphics
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GLWidget gl_widget;
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gl_widget.show();
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return app.exec();
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}
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‎cvQtCameraGL/screenshot.gif

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‎cvQtCameraGL/widget.cpp

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/* Copyright (C) 2013-2020 Karl Phillip Buhr <[email protected]>
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*
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* This work is licensed under the Creative Commons Attribution-ShareAlike License.
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* To view a copy of this license, visit:
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* https://creativecommons.org/licenses/by-sa/2.5/legalcode
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*
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* Or to read the human-readable summary of the license:
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* https://creativecommons.org/licenses/by-sa/2.5/
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*/
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#include "widget.h"
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#include <iostream>
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#include <QKeyEvent>
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#include <QTimer>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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// Enables the use of 3D perspective
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//#define USE_PERSPECTIVE
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GLWidget::GLWidget(QWidget *parent)
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: QGLWidget(parent)
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{
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_width = 0;
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_height = 0;
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_texture = 0;
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_fps = 0;
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}
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GLWidget::~GLWidget()
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{
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glDeleteTextures(1, &_texture);
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}
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void GLWidget::_tick()
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{
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// triggers paintGL()
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updateGL();
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// Set timer according to FPS
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QTimer::singleShot(1000/_fps, this, SLOT(_tick()));
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}
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void GLWidget::initializeGL()
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{
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// Set clear color as black
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glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
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// Select pixel storage mode used by glTexImage2D
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glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
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// Create the texture
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glGenTextures(1, &_texture);
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/* Open default camera device */
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cv_capture.open(0);
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if (!cv_capture.isOpened())
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{
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std::cout << "GLWidget::initializeGL: !!! Failed to open camera" << std::endl;
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return;
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}
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// Retrieve FPS from the camera
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_fps = cv_capture.get(cv::CAP_PROP_FPS);
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if (!_fps) // if the function fails, fps is set to 15
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_fps = 15;
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std::cout << "GLWidget::initializeGL: " << _fps << " fps" << std::endl;
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// Retrieve the width and height of the captured frame
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_width = cv_capture.get(cv::CAP_PROP_FRAME_WIDTH);
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_height = cv_capture.get(cv::CAP_PROP_FRAME_HEIGHT);
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resize(QSize(_width, _height));
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std::cout << "GLWidget::initializeGL: capture size=" << _width << "x" << _height << std::endl;
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std::cout << "GLWidget::initializeGL: window size=" << this->width() << "x" << this->height() << std::endl;
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/* Start the timer */
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_tick();
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}
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void GLWidget::paintGL()
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{
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// Abort drawing if OpenCV was unable to open the camera
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if (!cv_capture.isOpened())
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{
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std::cout << "GLWidget::paintGL: !!! Failed to open camera" << std::endl;
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return;
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}
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// Clear the screen and depth buffer (with black) then S«select the model view matrix and reset it
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glClear(GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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#ifdef USE_PERSPECTIVE
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glTranslatef(0.0f, 0.0f, -1.5);
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#endif
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// Note: trying to retrieve more frames than the camera can give you makes the output video blink a lot
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cv_capture >> cv_frame;
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if (cv_frame.empty())
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{
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std::cout << "GLWidget::paintGL: !!! Failed to retrieve frame" << std::endl;
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return;
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}
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//std::cout << "GLWidget::paintGL: frame size " << cv_frame.cols << "x" << cv_frame.rows << std::endl;
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cv::cvtColor(cv_frame, cv_frame, cv::COLOR_BGR2RGBA);
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glEnable(GL_TEXTURE_RECTANGLE_ARB);
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// Typical texture generation using data from the bitmap
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glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _texture);
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// Transfer image data to the GPU
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glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
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GL_RGBA, cv_frame.cols, cv_frame.rows, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, cv_frame.data);
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if (glGetError() != GL_NO_ERROR)
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{
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std::cout << "GLWidget::paintGL: !!! Failed glTexImage2D" << std::endl;
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}
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// Draw a 2D face with texture
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glBegin(GL_QUADS);
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#ifdef USE_PERSPECTIVE
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// glPerspective (3D)
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glTexCoord2f(0, 0); glVertex2f(1.0, 1.0);
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glTexCoord2f(cv_frame.cols, 0); glVertex2f(-1.0, 1.0);
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glTexCoord2f(cv_frame.cols, cv_frame.rows); glVertex2f(-1.0, -1.0);
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glTexCoord2f(0, cv_frame.rows); glVertex2f(1.0, -1.0);
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#else
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// glOrtho (2D)
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glTexCoord2f(0, 0); glVertex2f( 0.0, 0.0);
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glTexCoord2f(cv_frame.cols, 0); glVertex2f(_width, 0.0);
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glTexCoord2f(cv_frame.cols, cv_frame.rows); glVertex2f(_width, _height);
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glTexCoord2f(0, cv_frame.rows); glVertex2f( 0.0, _height);
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#endif
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glEnd();
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glDisable(GL_TEXTURE_RECTANGLE_ARB);
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glFlush();
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}
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void glPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar)
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{
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GLdouble ymax = zNear * tan( fovy * M_PI / 360.0 );
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GLdouble ymin = -ymax;
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GLdouble xmin = ymin * aspect;
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GLdouble xmax = ymax * aspect;
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glFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
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}
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void glOrtho2D(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top)
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{
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glOrtho(left, right, bottom, top, -1, 1);
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}
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void GLWidget::resizeGL(int w, int h)
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{
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_width = w;
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_height = h;
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glViewport ( 0, 0, _width, _height );
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glMatrixMode ( GL_PROJECTION );
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glLoadIdentity ( );
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#ifdef USE_PERSPECTIVE
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if (h == 0)
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glPerspective( 60, ( float ) w, 1.0, 100.0 );
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else
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glPerspective( 60, ( float ) w / ( float ) h, 1.0, 100.0 );
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#else
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glOrtho(0, _width, _height, 0, 1, -1);
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#endif
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}

‎cvQtCameraGL/widget.h

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/* Copyright (C) 2013-2020 Karl Phillip Buhr <[email protected]>
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*
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* This work is licensed under the Creative Commons Attribution-ShareAlike License.
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* To view a copy of this license, visit:
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* https://creativecommons.org/licenses/by-sa/2.5/legalcode
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*
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* Or to read the human-readable summary of the license:
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* https://creativecommons.org/licenses/by-sa/2.5/
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*/
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#pragma once
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#include <opencv2/opencv.hpp>
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#include <QGLWidget>
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#include <QImage>
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class GLWidget : public QGLWidget
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{
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Q_OBJECT
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public:
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explicit GLWidget(QWidget* parent = 0);
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virtual ~GLWidget();
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/* OpenGL initialization, viewport resizing, and painting */
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void initializeGL();
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void paintGL();
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void resizeGL( int width, int height);
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private:
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int _width;
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int _height;
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cv::Mat cv_frame;
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cv::VideoCapture cv_capture;
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int _fps;
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GLuint _texture;
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protected slots:
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void _tick();
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};

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