1 files changed, 42 insertions, 0 deletions
diff --git a/converter/other/pamtosvg/image-proc.h b/converter/other/pamtosvg/image-proc.h
new file mode 100644
index 00000000..a5b86ec1
--- /dev/null
+++ b/converter/other/pamtosvg/image-proc.h
@@ -0,0 +1,42 @@
+/* image-proc.h: image processing routines */
+
+#ifndef IMAGE_PROC_H
+#define IMAGE_PROC_H
+
+#include "bitmap.h"
+#include "exception.h"
+
+
+/* Threshold for binarizing a monochrome image */
+#define GRAY_THRESHOLD 225
+
+/* RGB to grayscale */
+#define LUMINANCE(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11 + 0.5)
+
+
+typedef struct
+{
+  unsigned height, width;
+  float **weight;
+  float **d;
+} distance_map_type;
+
+
+/* Allocate and compute a new distance map. */
+extern distance_map_type new_distance_map(bitmap_type,
+    unsigned char target_value, bool padded,
+					  at_exception_type * exp);
+
+/* Free the dynamically-allocated storage associated with a distance map. */
+extern void free_distance_map(distance_map_type*);
+
+
+/* Binarize a grayscale or color image. */
+extern void binarize(bitmap_type*);
+
+
+/* Thin a binary image, replacing the original image with the thinned one. */
+extern bitmap_type ip_thin(bitmap_type);
+
+#endif /* not IMAGE_PROC_H */
+