zchrissirhcz/smallcv

Lightweight Mat and imread()/imwrite()/imshow()

SmallCV

Small Computer Vision Library.

Features

• Lightweight
  • C++11 based
  • Not including optimization
• Conformance
  • API like OpenCV
  • Same result on PC and Android

APIs

Supported:

• Mat
• imread()/imwrite()/imshow()/waitKey()
• cvtColor()/resize()
• putText()/rectangle()/circle()/line()

Not supported:

• Mat::clone()
• saturate_cast
• parallel_for_
• operator Point_<Tp2>

Getting Started

To build this project, you are assumed:

• Familiar with CMake based C/C++ building
• Install glfw for imshow(). See deps/glfw_build for build hints.
• Modify cmake/deps.cmake to specify dependencies paths.

cd build
./linux-x64.sh   # Linux build
./Xcode.sh       # macOSX build
.\vs2019-x64.cmd # Windows build

Example Usage

#include <string>
#include "smallcv.hpp"

int main() {
    std::string image_path = "mingren.jpg";
    cv::Mat image = cv::imread(image_path);
    cv::Rect rect(100, 100, 233, 233);
    cv::rectangle(image, rect, cv::Scalar(0,0,255), 2);
    cv::imshow("mingren", image);
    cv::waitKey(0);
    cv::imwrite("mingren_swap.bmp", image);

    return 0;
}

#include <string>
#include "smallcv.hpp"

int main()
{
    std::string image_path = "mingren.jpg";
    //std::string image_path = "E:/projects/arccv/smallcv/build/vs2019-x64/mingren.jpg";
    cv::Mat image = cv::imread(image_path);
    cv::Rect rect(100, 100, 233, 233);
    cv::rectangle(image, rect, cv::Scalar(0,0,255), 2);
    
    cv::Mat bigger_image;
    cv::Size ssize = image.size();
    cv::Size dsize = ssize * 2;
    cv::resize(image, bigger_image, dsize);

    cv::Mat gray;
    cv::cvtColor(image, gray, cv::COLOR_BGR2GRAY);
    

    cv::putText(image, "image", cv::Point(60, 60), 10, 1, cv::Scalar(255, 0, 0), 2);
    cv::putText(bigger_image, "bigger image", cv::Point(60, 60), 10, 1, cv::Scalar(255, 0, 0), 2);
    cv::putText(gray, "gray", cv::Point(60, 60), 10, 1, cv::Scalar(255, 0, 0), 2);

    cv::imshow("mingren", image);
    cv::imshow("bigger image", bigger_image);
    cv::imshow("gray", gray);

    cv::waitKey(0);

    cv::imwrite("image.png", image);
    cv::imwrite("bigger_image.png", bigger_image);
    cv::imwrite("gray.png", gray);
}

Acknowledgement

SmallCV referenced the following projects：

• OpenCV
• ncnn
• shufaCV