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authorBenjamin Franzke <benjaminfranzke@googlemail.com>2012-04-20 13:04:41 +0200
committerBenjamin Franzke <benjaminfranzke@googlemail.com>2012-04-20 13:21:07 +0200
commitb39b9697bcc9270953ecadf11d2bedbc4f87ced6 (patch)
treeed1d3ed86e14441b2398c0c93322f7e894f0c5db
parent2367f3543163b6b12bab2d9a1b5bbd4adc98eb41 (diff)
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Add hst: Histogramm based SegmenTation
-rw-r--r--Makefile6
-rw-r--r--hst.c126
2 files changed, 131 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 559cdaa..0e7e3a5 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,10 @@ unvignette_LIBS=$(shell pkg-config --libs cairo) -lm
cvg_CFLAGS=$(shell pkg-config --cflags gtk+-3.0 glib-2.0 gmodule-2.0 opencv)
cvg_LIBS=$(shell pkg-config --libs gtk+-3.0 glib-2.0 gmodule-2.0 opencv)
-PROGS = wimmel wimmel_gl roi capture unvignette cvg
+hst_CFLAGS=$(shell pkg-config --cflags gdk-pixbuf-2.0 glib-2.0)
+hst_LIBS=$(shell pkg-config --libs gdk-pixbuf-2.0 glib-2.0)
+
+PROGS = wimmel wimmel_gl roi capture unvignette cvg hst
OBJS = $(PROGS:=.o) util.o
all: $(PROGS)
@@ -33,6 +36,7 @@ roi: roi.o
capture: capture.o
unvignette: unvignette.o
cvg: cvg.o
+hst: hst.o
.PHONY: clean all
diff --git a/hst.c b/hst.c
new file mode 100644
index 0000000..63516c7
--- /dev/null
+++ b/hst.c
@@ -0,0 +1,126 @@
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <glib.h>
+
+#ifndef INTERVAL
+#define INTERVAL 8
+#endif
+#define BLOCKS (256 / INTERVAL)
+
+struct cell {
+ int i, j, k;
+ int count;
+ struct cell *max;
+};
+
+struct hst {
+ struct cell cells[BLOCKS][BLOCKS][BLOCKS];
+ GList *list;
+};
+
+static inline void
+pixbuf_get(GdkPixbuf *pixbuf, guchar **pixels,
+ gint *width, gint *height, gint *nch, gint *stride)
+{
+ if (pixels) *pixels = gdk_pixbuf_get_pixels(pixbuf);
+ if (width) *width = gdk_pixbuf_get_width(pixbuf);
+ if (height) *height = gdk_pixbuf_get_height(pixbuf);
+ if (nch) *nch = gdk_pixbuf_get_n_channels(pixbuf);
+ if (stride) *stride = gdk_pixbuf_get_rowstride(pixbuf);
+}
+
+static gint
+compare_cell(gconstpointer a, gconstpointer b)
+{
+ const struct cell *cell1 = a;
+ const struct cell *cell2 = b;
+
+ return cell1->count - cell2->count;
+}
+
+static void
+add_neighbors(struct hst *hst, struct cell *cell)
+{
+ int i, j, k;
+
+ for (i = MAX(cell->i - 1, 0); i < MIN(cell->i + 1, BLOCKS); ++i) {
+ for (j = MAX(cell->j - 1, 0); j < MIN(cell->j + 1, BLOCKS); ++j) {
+ for (k = MAX(cell->k - 1, 0); k < MIN(cell->k + 1, BLOCKS); ++k) {
+ if (hst->cells[i][j][k].count <= cell->count &&
+ hst->cells[i][j][k].max == NULL) {
+ hst->cells[i][j][k].max = cell->max;
+ add_neighbors(hst, &hst->cells[i][j][k]);
+ }
+ }
+ }
+ }
+ hst->list = g_list_remove(hst->list, cell);
+}
+
+int
+main(int argc, char *argv[])
+{
+ GdkPixbuf *image;
+ gint x, y, width, height, nch, stride;
+ int i, j, k;
+ guchar *p, *row;
+ int cluster = 0;
+ struct hst hst;
+ struct cell *cell;
+
+ g_type_init();
+
+ if (argc < 2)
+ return 1;
+
+ image = gdk_pixbuf_new_from_file(argv[1], NULL);
+ if (!image)
+ return 1;
+
+ hst.list = NULL;
+ for (i = 0; i < BLOCKS; ++i) {
+ for (j = 0; j < BLOCKS; ++j) {
+ for (k = 0; k < BLOCKS; ++k) {
+ hst.cells[i][j][k].i = i;
+ hst.cells[i][j][k].j = j;
+ hst.cells[i][j][k].k = k;
+ hst.cells[i][j][k].count = 0;
+ hst.cells[i][j][k].max = NULL;
+ }
+ }
+ }
+
+ pixbuf_get(image, &row, &width, &height, &nch, &stride);
+ for (y = 0; y < height; ++y, row += stride)
+ for (x = 0, p = row; x < width; ++x, p += nch)
+ ++hst.cells[p[0] / INTERVAL][p[1] / INTERVAL][p[2] / INTERVAL].count;
+
+ for (i = 0; i < BLOCKS; ++i)
+ for (j = 0; j < BLOCKS; ++j)
+ for (k = 0; k < BLOCKS; ++k)
+ hst.list = g_list_insert_sorted(hst.list,
+ &hst.cells[i][j][k],
+ compare_cell);
+
+ while (hst.list) {
+ cell = g_list_nth_data(hst.list, 0);
+ cell->max = cell;
+ add_neighbors(&hst, cell);
+ ++cluster;
+ }
+ printf("cluster: %d\n", cluster);
+
+ pixbuf_get(image, &row, &width, &height, &nch, &stride);
+ for (y = 0; y < height; ++y, row += stride) {
+ for (x = 0, p = row; x < width; ++x, p += nch) {
+ cell = &hst.cells[p[0] / INTERVAL][p[1] / INTERVAL][p[2] / INTERVAL];
+
+ p[0] = cell->max->i * INTERVAL;
+ p[1] = cell->max->j * INTERVAL;
+ p[2] = cell->max->k * INTERVAL;
+ }
+ }
+
+ gdk_pixbuf_save(image, argc > 2 ? argv[2] : "hst.tiff", "tiff", NULL, NULL);
+
+ return 0;
+}