1 files changed, 42 insertions, 0 deletions
diff --git a/src/kernels/estimate-noise.cl b/src/kernels/estimate-noise.cl
new file mode 100644
index 0000000..31815d3
--- /dev/null
+++ b/src/kernels/estimate-noise.cl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2011-2019 Karlsruhe Institute of Technology
+ *
+ * This file is part of Ufo.
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+kernel void
+convolve_abs_laplacian_diff (read_only image2d_t input,
+                             const sampler_t sampler,
+                             global float *output)
+{
+    int idx = get_global_id (0);
+    int idy = get_global_id (1);
+    int width = get_global_size (0);
+    int height = get_global_size (1);
+    float sum = 0.0f;
+    float coeffs[3][3] = {{ 1.0f, -2.0f,  1.0f},
+                        {-2.0f,  4.0f, -2.0f},
+                        { 1.0f, -2.0f,  1.0f}};
+
+    for (int dy = -1; dy < 2; dy++) {
+        for (int dx = -1; dx < 2; dx++) {
+            sum += coeffs[dy + 1][dx + 1] * read_imagef (input, sampler, (float2) ((idx + dx + 0.5f) / width,
+                                                                                   (idy + dy + 0.5f) / height)).x;
+        }
+    }
+
+    output[idy * width + idx] = fabs (sum);
+}