Add color map based on MatplotLib.

Author: tatsy

README.md

@@ -47,6 +47,15 @@ This library supports following methods.
     * Uniform noise
     * Perlin noise
 
+### Image Assessment
+
+* Mean squared error (MSE)
+* Root mean squared error (RMSE)
+* Peak signal-to-noise ratio (PSNR)
+* Structural similarity (SSIM)
+* Multi-scale structural similarity (MS-SSIM)
+* Color multi-scale structural similarity (CM-SSIM)
+
 ## Samples
 
 You can compile all the samples using CMake!

examples/cpp/CMakeLists.txt

@@ -4,6 +4,7 @@ endif()
 
 message(STATUS "[ LIME ] Build examples.")
 add_example(color_constancy)
+add_example(colormap)
 add_example(flow_field_design)
 add_example(npr_filters)
 add_example(pencil_drawing)

examples/cpp/colormap/colormap.cpp

@@ -0,0 +1,36 @@
+#include <opencv2/opencv.hpp>
+#include <lime.hpp>
+
+int main(int argc, char** argv) {
+    const int size = 256;
+    const int interval = size / 16;
+
+    cv::Mat intensity(size, size, CV_8UC1);
+    for (int y = 0; y < size; y++) {
+        for (int x = 0; x < size; x++) {
+            const int row = y / interval;
+            const int col = x / interval;
+            const int val = row * 16 + col;
+            intensity.at<uchar>(y, x) = val;
+        }
+    }
+
+    cv::Mat jet, coolwarm, inferno, magma, plasma, viridis;
+    lime::pseudoColors(intensity, jet, lime::CMap::Jet);
+    lime::pseudoColors(intensity, coolwarm, lime::CMap::CoolWarm);
+    lime::pseudoColors(intensity, inferno, lime::CMap::Inferno);
+    lime::pseudoColors(intensity, magma, lime::CMap::Magma);
+    lime::pseudoColors(intensity, plasma, lime::CMap::Plasma);
+    lime::pseudoColors(intensity, viridis, lime::CMap::Viridis);
+
+    cv::imshow("Intensity", intensity);
+    cv::imshow("Jet", jet);
+    cv::imshow("CoolWarm", coolwarm);
+    cv::imshow("Inferno", inferno);
+    cv::imshow("Magma", magma);
+    cv::imshow("Plasma", plasma);
+    cv::imshow("Viridis", viridis);
+
+    cv::waitKey();
+    cv::destroyAllWindows();
+}