added tests for signed integer and floating point channel types for t…

…hreshold algorithms

test/core/image_processing/threshold_binary.cpp

@@ -17,12 +17,21 @@ namespace gil = boost::gil;
 int height = 4;
 int width = 4;
 
-gil::gray8_image_t original_gray(width, height), threshold_gray(width, height),
-expected_gray(width, height);
+gil::gray8_image_t original_gray(width, height);
+gil::gray8_image_t threshold_gray(width, height);
+gil::gray8_image_t expected_gray(width, height);
 
-gil::rgb8_image_t original_rgb(width, height), threshold_rgb(width, height),
-expected_rgb(width, height);
+gil::rgb8_image_t original_rgb(width, height);
+gil::rgb8_image_t threshold_rgb(width, height);
+gil::rgb8_image_t expected_rgb(width, height);
 
+gil::rgb8s_image_t original_rgbs(width, height);
+gil::rgb8s_image_t threshold_rgbs(width, height);
+gil::rgb8s_image_t expected_rgbs(width, height);
+
+gil::gray32f_image_t original_gray32f(width, height);
+gil::gray32f_image_t threshold_gray32f(width, height);
+gil::gray32f_image_t expected_gray32f(width, height);
 
 void fill_original_gray()
 {
@@ -44,6 +53,26 @@ void fill_original_rgb()
         original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(203, 9, 60));
 }
 
+void fill_original_rgbs()
+{
+    //filling original_rgb view's upper half part with rgbs pixels of value 50, 155, 115
+    //filling original_rgb view's lower half part with rgbs pixels of value 203, 9, 60
+    gil::fill_pixels(gil::subimage_view(gil::view(original_rgbs), 0, 0, original_rgbs.width(),
+        original_rgbs.height() / 2), gil::rgb8s_pixel_t(-42, 80, 83));
+    gil::fill_pixels(gil::subimage_view(gil::view(original_rgbs), 0, original_rgbs.height() / 2,
+        original_rgbs.width(), original_rgbs.height() / 2), gil::rgb8s_pixel_t(95, -50, 42));
+}
+
+void fill_original_gray32f()
+{
+    //filling original_gray view's upper half part with gray pixels of value 0.3
+    //filling original_gray view's lower half part with gray pixels of value 0.7
+    gil::fill_pixels(gil::subimage_view(gil::view(original_gray32f), 0, 0, original_gray32f.width(),
+        original_gray32f.height() / 2), gil::gray32f_pixel_t(0.3f));
+    gil::fill_pixels(gil::subimage_view(gil::view(original_gray32f), 0, original_gray32f.height() / 2,
+        original_gray32f.width(), original_gray32f.height() / 2), gil::gray32f_pixel_t(0.7f));
+}
+
 void binary_gray_to_gray()
 {
     //expected_gray view after thresholding of the original_gray view with threshold_gray value of 100
@@ -122,16 +151,51 @@ void binary_inverse_rgb_to_rgb()
     BOOST_TEST(gil::equal_pixels(gil::view(threshold_rgb), gil::view(expected_rgb)));
 }
 
+void binary_rgbs_to_rgbs()
+{
+    //expected_rgbs view after thresholding of the original_rgbs view with threshold value of 70
+    //filling expected_rgb view's upper half part with rgb pixels of value -128, 127, 127
+    //filling expected_rgb view's lower half part with rgb pixels of value 127, -128, -128
+    gil::fill_pixels(gil::subimage_view(gil::view(expected_rgbs), 0, 0, original_rgbs.width(),
+        original_rgbs.height() / 2), gil::rgb8s_pixel_t(-128, 95, 95));
+    gil::fill_pixels(gil::subimage_view(gil::view(expected_rgbs), 0, original_rgbs.height() / 2,
+        original_rgbs.width(), original_rgbs.height() / 2), gil::rgb8s_pixel_t(95, -128, -128));
+
+    gil::threshold_binary(gil::view(original_rgbs), gil::view(threshold_rgbs), 70, 95);
+
+    //comparing threshold_rgb view generated by the function with the expected_rgb view
+    BOOST_TEST(gil::equal_pixels(gil::view(threshold_rgb), gil::view(expected_rgb)));
+}
+
+void binary_gray32f_to_gray32f()
+{
+    //expected_gray view after thresholding of the original_gray view with threshold_gray value of 0.5f
+    //filling expected_gray view's upper half part with gray pixels of value 0.0
+    //filling expected_gray view's lower half part with gray pixels of value 1.0f
+    gil::fill_pixels(gil::subimage_view(gil::view(expected_gray32f), 0, 0, original_gray32f.width(),
+        original_gray32f.height() / 2), gil::gray32f_pixel_t(0.0f));
+    gil::fill_pixels(gil::subimage_view(gil::view(expected_gray32f), 0, original_gray32f.height() / 2,
+        original_gray32f.width(), original_gray32f.height() / 2), gil::gray32f_pixel_t(1.0f));
+
+    gil::threshold_binary(gil::view(original_gray32f), gil::view(threshold_gray32f), 0.5);
+
+    //comparing threshold_gray view generated by the function with the expected_gray view
+    BOOST_TEST(gil::equal_pixels(gil::view(threshold_gray32f), gil::view(expected_gray32f)));
+}
 
 int main()
 {
     fill_original_gray();
     fill_original_rgb();
+    fill_original_rgbs();
+    fill_original_gray32f();
 
     binary_gray_to_gray();
     binary_inverse_gray_to_gray();
     binary_rgb_to_rgb();
+    binary_rgbs_to_rgbs();
     binary_inverse_rgb_to_rgb();
+    binary_gray32f_to_gray32f();
 
     return boost::report_errors();
 }