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ResourceCompilerImage/neuquant.h

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+/* NeuQuant Neural-Net Quantization Algorithm Interface
+ * ----------------------------------------------------
+ *
+ * Copyright (c) 1994 Anthony Dekker
+ *
+ * NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994.
+ * See "Kohonen neural networks for optimal colour quantization"
+ * in "Network: Computation in Neural Systems" Vol. 5 (1994) pp 351-367.
+ * for a discussion of the algorithm.
+ * See also  http://www.acm.org/~dekker/NEUQUANT.HTML
+ *
+ * Any party obtaining a copy of these files from the author, directly or
+ * indirectly, is granted, free of charge, a full and unrestricted irrevocable,
+ * world-wide, paid up, royalty-free, nonexclusive right and license to deal
+ * in this software and documentation files (the "Software"), including without
+ * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons who receive
+ * copies from any such party to do so, with the only requirement being
+ * that this copyright notice remain intact.
+ */
+
+
+#include <stdio.h>
+
+
+#define netsize		256			/* number of colours used */
+
+
+/* For 256 colours, fixed arrays need 8kb, plus space for the image
+   ---------------------------------------------------------------- */
+
+
+/* four primes near 500 - assume no image has a length so large */
+/* that it is divisible by all four primes */
+#define prime1		499
+#define prime2		491
+#define prime3		487
+#define prime4		503
+
+#define minpicturebytes	(3*prime4)		/* minimum size for input image */
+
+
+/* Initialise network in range (0,0,0) to (255,255,255) and set parameters
+   ----------------------------------------------------------------------- */
+void initnet(unsigned char *thepic, int len, int sample);
+		
+/* Unbias network to give byte values 0..255 and record position i to prepare for sort
+   ----------------------------------------------------------------------------------- */
+void unbiasnet();	/* can edit this function to do output of colour map */
+
+/* Output colour map
+   ----------------- */
+void writecolourmap(unsigned char *p);
+
+/* Insertion sort of network and building of netindex[0..255] (to do after unbias)
+   ------------------------------------------------------------------------------- */
+void inxbuild();
+
+/* Search for BGR values 0..255 (after net is unbiased) and return colour index
+   ---------------------------------------------------------------------------- */
+int inxsearch(register int b, register int g, register int r);
+
+/* Main Learning Loop
+   ------------------ */
+void learn();
+
+/* Program Skeleton
+   ----------------
+   	[select samplefac in range 1..30]
+   	pic = (unsigned char*) malloc(3*width*height);
+   	[read image from input file into pic]
+	initnet(pic,3*width*height,samplefac);
+	learn();
+	unbiasnet();
+	[write output image header, using writecolourmap(f),
+	possibly editing the loops in that function]
+	inxbuild();
+	[write output image using inxsearch(b,g,r)]		*/