Fix hdfile layering violations

1 files changed, 97 insertions, 0 deletions

diff --git a/src/filters.c b/src/filters.c
new file mode 100644
index 00000000..235d2822
--- /dev/null
+++ b/src/filters.c
@@ -0,0 +1,97 @@
+/*
+ * filters.c
+ *
+ * Image filtering
+ *
+ * (c) 2006-2010 Thomas White <taw@physics.org>
+ *
+ * Part of CrystFEL - crystallography with a FEL
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+#include <assert.h>
+#include <gsl/gsl_statistics_int.h>
+
+#include "image.h"
+
+
+static int compare_vals(const void *ap, const void *bp)
+{
+	const signed int a = *(signed int *)ap;
+	const signed int b = *(signed int *)bp;
+
+	if ( a > b ) return 1;
+	if ( a < b ) return -1;
+	return 0;
+}
+
+
+static void clean_panel(struct image *image, int sx, int sy)
+{
+	int x, y;
+	const int s = sizeof(signed int);
+
+	for ( y=0; y<128; y++ ) {
+
+		signed int vals[512];
+		double m;
+
+		for ( x=0; x<512; x++ ) {
+			vals[x] = image->data[(x+sx)+(y+sy)*image->width];
+		}
+
+		qsort(&vals[0], 512, s, compare_vals);
+
+		m = gsl_stats_int_median_from_sorted_data(vals, 1, 512);
+
+		for ( x=0; x<512; x++ ) {
+			image->data[(x+sx)+(y+sy)*image->width] -= m;
+		}
+
+	}
+
+	for ( x=0; x<512; x++ ) {
+
+		signed int vals[128];
+		double m;
+
+		for ( y=0; y<128; y++ ) {
+			vals[y] = image->data[(x+sx)+(y+sy)*image->width];
+		}
+
+		qsort(&vals[0], 128, s, compare_vals);
+
+		m = gsl_stats_int_median_from_sorted_data(vals, 1, 128);
+
+		for ( y=0; y<128; y++ ) {
+			image->data[(x+sx)+(y+sy)*image->width] -= m;
+		}
+
+	}
+}
+
+
+/* Pre-processing to make life easier */
+void clean_image(struct image *image)
+{
+	int px, py;
+
+	if ( (image->width != 1024) || (image->height != 1024) ) return;
+
+	for ( px=0; px<2; px++ ) {
+	for ( py=0; py<8; py++ ) {
+
+		clean_panel(image, 512*px, 128*py);
+
+	}
+	}
+}