adds video-to-ascii-cpp #65

opencv/examples/cpp/video-to-ascii-cpp/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(main)
+
+#Set Source Code Path
+set(SRC_PATH src)
+set(${PROJECT_NAME}_SRC
+   ${SRC_PATH}/main.cpp
+)
+SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
+
+#Include opencv
+find_package(OpenCV 4 REQUIRED)
+include_directories(${OpenCV_INCLUDE_DIRS})
+
+#Executable
+add_executable( ${PROJECT_NAME} ${${PROJECT_NAME}_SRC} )
+target_link_libraries( ${PROJECT_NAME} ${OpenCV_LIBS} )
+

opencv/examples/cpp/video-to-ascii-cpp/README.md

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+# Video to ASCII Converter (C++)
+
+## Launching app
+use Ctrl+- to decrease font size and fit ascii video conversion
+
+
+## References
+* GitHub
+  * https://github.com/servetgulnaroglu/video-to-ascii-cpp/tree/main 
+* Varios videos in youtube
+  * https://www.youtube.com/watch?v=_JIctc1wmCw 
+  * https://www.youtube.com/watch?v=3N7fRURLz4A&t=94s  
+  * https://www.youtube.com/watch?v=zHxgUFYwoRQ
+

opencv/examples/cpp/video-to-ascii-cpp/src/main.cpp

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+#include <opencv2/opencv.hpp>
+
+#include <chrono>
+#include <iostream>
+#include <thread>
+using namespace std;
+using namespace cv;
+
+#define VID_WIDTH 640
+#define VID_HEIGHT 480
+#define VIDEO_IN "/dev/video0"
+
+
+string pixelToASCII(int pixel_intensity) {
+  //const string ASCII_CHARS = "@$%#&!*+=-_.                ";
+  //const string ASCII_CHARS = "@#&!*+=-_.     ";
+  const string ASCII_CHARS = "   ._-=+*!&#%$@";
+  string s =
+      string(1, ASCII_CHARS[pixel_intensity * ASCII_CHARS.length() / 256]);
+  return s;
+}
+
+int main() {
+  VideoCapture cap(VIDEO_IN);
+
+  double fps = cap.get(CAP_PROP_FPS);
+
+  cout << fps << endl;
+
+  //int frame_duration_ms = 10000 / fps;
+  //int frame_duration_ms = 1000 / fps;  //DEFAULT
+  int frame_duration_ms = 100 / fps;
+  //int frame_duration_ms = 10 / fps;
+  //int frame_duration_ms = 1 / fps;
+
+  int width = 250;
+  int height = 50;
+
+  int frame_width = cap.get(CAP_PROP_FRAME_WIDTH);
+  int frame_height = cap.get(CAP_PROP_FRAME_HEIGHT);
+  cout << frame_width << " " << frame_height << endl;
+  // 4096 2160
+  // 751 × 944
+
+  height = (width * frame_height / frame_width) * 0.4194;
+
+  Mat frame, gray_frame, resized_frame;
+
+  while (true) {
+    cap >> frame;
+    if (frame.empty())
+      break;
+
+    cv::cvtColor(frame, gray_frame, cv::COLOR_BGR2GRAY);
+
+    resize(gray_frame, resized_frame, Size(width, height), 0, 0, INTER_LINEAR);
+
+    string ascii_frame;
+    for (int i = 0; i < height; i++) {
+      for (int j = 0; j < width; j++) {
+        ascii_frame += pixelToASCII(resized_frame.at<uchar>(i, j));
+      }
+      ascii_frame += "\n";
+    }
+
+    system("clear"); // to clear the console
+    cout << ascii_frame;
+    std::this_thread::sleep_for(std::chrono::milliseconds(frame_duration_ms));
+  }
+
+  return 0;
+}