Added basic example and started tests example

- Basic example only makes some matrices and apply basic operations on them
- Tests example test every useful for embedded system features of opencv

esp32/examples/esp_opencv_basic/CMakeLists.txt

@@ -2,4 +2,4 @@
 # CMakeLists in this exact order for cmake to work correctly
 cmake_minimum_required(VERSION 3.5)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
-project(esp_opencv)
+project(esp_opencv_basic)

esp32/examples/esp_opencv_basic/README.md

@@ -0,0 +1,3 @@
+# Esp32 OpenCV basic
+
+This is a basic example to test that OpenCV works correctly. The project only creates some matrices and apply basic operations on them.

esp32/examples/esp_opencv_basic/main/CMakeLists.txt

@@ -0,0 +1,18 @@
+set(COMPONENT_SRCS "hello_opencv.cpp")
+set(COMPONENT_ADD_INCLUDEDIRS "." "./opencv/")
+register_component()
+
+# Be aware that the order of the librairies is important
+add_prebuilt_library(opencv_imgcodecs "opencv/libopencv_imgcodecs.a")
+add_prebuilt_library(libpng "opencv/3rdparty/liblibpng.a")
+add_prebuilt_library(libzlib "opencv/3rdparty/libzlib.a")
+add_prebuilt_library(opencv_imgproc "opencv/libopencv_imgproc.a")
+add_prebuilt_library(opencv_core "opencv/libopencv_core.a")
+add_prebuilt_library(ade "opencv/libade.a")
+
+target_link_libraries(${COMPONENT_LIB} PRIVATE opencv_imgcodecs)
+target_link_libraries(${COMPONENT_LIB} PRIVATE libpng)
+target_link_libraries(${COMPONENT_LIB} PRIVATE libzlib)
+target_link_libraries(${COMPONENT_LIB} PRIVATE opencv_imgproc)
+target_link_libraries(${COMPONENT_LIB} PRIVATE opencv_core)
+target_link_libraries(${COMPONENT_LIB} PRIVATE ade)

esp32/examples/esp_opencv_basic/main/hello_opencv.cpp

@@ -0,0 +1,60 @@
+#include "opencv2/core.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/imgcodecs.hpp"
+
+#include <esp_log.h>
+#include <string>
+#include "sdkconfig.h"
+#include <iostream>
+#include <sys/unistd.h>
+#include <sys/stat.h>
+#include <esp_err.h>
+#include <esp_spiffs.h>
+
+
+using namespace cv;
+using namespace std;
+
+
+static char TAG[]="hello_opencv";
+
+extern "C" {
+void app_main(void);
+}
+
+void app_main(void)
+{
+    ESP_LOGI(TAG, "Starting main");
+
+    /* Matrices initialization tests */
+    Mat M1(2,2, CV_8UC3, Scalar(0,0,255));
+    cout << "M1 = " << endl << " " << M1 << endl << endl;
+
+    Mat M2(2,2, CV_8UC3, Scalar(0,0,111));
+    cout << "M2 = " << endl << " " << M2 << endl << endl;
+
+    Mat eye = Mat::eye(10, 10, CV_32F) * 0.1;
+    cout << "eye = " << endl << " " << eye << endl << endl;
+
+    Mat ones = Mat::ones(15, 4, CV_8U)*3;
+    cout << "ones = " << endl << " " << ones << endl << endl;
+
+    vector<float> v;
+    v.push_back((float)CV_PI);
+    v.push_back(2);
+    v.push_back(3.01f);
+    cout << "floats vector = " << endl << " " << Mat(v) << endl << endl;
+
+    /* Matrices imgproc operations tests */
+    uint8_t data[15] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+    Mat M3 = Mat(3, 5, CV_8UC1, data);
+    cout << "Gray matrix = " << endl << " " << M3 << endl << endl;
+
+    Mat M4;
+    threshold(M3, M4, 7, 255, THRESH_BINARY);
+    cout << "Thresholded matrix = " << endl << " " << M4 << endl << endl;
+
+    Mat M5;
+    resize(M3, M5, Size(), 0.75, 0.75);
+    cout << "Resized matrix = " << endl << " " << M5 << endl << endl;
+}