OpenCV C++ Demo

A comprehensive demonstration of OpenCV capabilities in C++, showcasing image processing, drawing operations, and webcam capture.

Features

• Image Processing: Grayscale conversion, Gaussian blur, Canny edge detection
• Drawing Operations: Circles, rectangles, lines, polygons, and text
• Webcam Capture: Real-time video feed processing (optional)
• Custom Filter: Template for implementing your own image filters

Prerequisites

Ubuntu/Debian

sudo apt update
sudo apt install libopencv-dev cmake build-essential

macOS

brew install opencv cmake

Fedora/RHEL

sudo dnf install opencv-devel cmake gcc-c++

Building

mkdir build
cd build
cmake ..
make

Running

./opencv_demo

Controls

• Press any key to advance through demos
• Press 'q' to quit
• In webcam mode: Press 'q' to exit webcam feed

Customization

The applyCustomFilter() function in main.cpp is left for you to implement! Try experimenting with:

• Bilateral filtering: bilateralFilter()
• Morphological operations: erode(), dilate(), morphologyEx()
• Color space conversions: cvtColor() with different color spaces
• Histogram equalization: equalizeHist()
• Image sharpening or embossing
• Custom kernels with filter2D()

Learning Resources

• OpenCV C++ Tutorial
• OpenCV API Reference

Troubleshooting

If you get "cannot open webcam" error, make sure:

1. Your webcam is connected and not in use by another application
2. You have permissions to access the webcam
3. Try changing the camera index from 0 to 1 or 2 in VideoCapture cap(0)