From 62f0b16f639a9ecb116a79819655bdf44e269443 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Mon, 16 May 2016 21:55:52 +0300
Subject: Initial commit

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 scripts/histo2png.py | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100755 scripts/histo2png.py

(limited to 'scripts/histo2png.py')

diff --git a/scripts/histo2png.py b/scripts/histo2png.py
new file mode 100755
index 0000000..ff1da21
--- /dev/null
+++ b/scripts/histo2png.py
@@ -0,0 +1,81 @@
+#!/usr/bin/python
+
+import matplotlib.pyplot as plt
+import struct
+import sys
+
+
+def usage(argv0):
+	print 'Usage: %s <histo.bin>' % argv0
+
+
+def main(argv):
+
+	if len(argv) != 2:
+		usage(argv[0])
+		return 1
+
+	data = file(argv[1], 'rb').read()
+
+	if len(data) == (2 + 64) * 4 or len(data) == (2 + 256) * 4:
+		maxmin = struct.unpack('<I', data[0:4])
+		sums = struct.unpack('<I', data[4:8])
+		histo = struct.unpack('<%uI' % (len(data[8:]) / 4), data[8:])
+
+		num_bins = len(histo);
+
+		title = 'min %u max %u sum %u' % \
+			((maxmin[0] >>  0) & 0xff, (maxmin[0] >> 16) & 0xff, sums[0])
+
+		print 'pixels (%u)' % sum(histo)
+
+		plt.figure(figsize=(10, 10))
+		plt.xlim([0, num_bins])
+		plt.ylim([0, max(histo)])
+		plt.bar(range(num_bins), histo, color='r');
+
+	elif len(data) == (6 + 64 * 3) * 4:
+		maxmin = struct.unpack('<III', data[0:12])
+		sums = struct.unpack('<III', data[12:24])
+		histo = [struct.unpack('<I', data[24+i*4:24+i*4+4])[0] for i in xrange(len(data[24:])/4)]
+
+		num_bins = len(histo) / 3;
+
+		histo_r = histo[0:num_bins]
+		histo_g = histo[num_bins:2*num_bins]
+		histo_b = histo[num_bins*2:]
+
+		title = 'RGB min (%u,%u,%u) max (%u,%u,%u) sum (%u,%u,%u)' % \
+			((maxmin[0] >>  0) & 0xff, (maxmin[1] >>  0) & 0xff, (maxmin[2] >>  0) & 0xff,
+			 (maxmin[0] >> 16) & 0xff, (maxmin[1] >> 16) & 0xff, (maxmin[2] >> 16) & 0xff,
+			 sums[0], sums[1], sums[2])
+
+		print 'pixels RGB (%u,%u,%u)' % (sum(histo_r), sum(histo_g), sum(histo_b))
+
+		plt.figure(figsize=(10, 20))
+		plt.subplot(3, 1, 1)
+		plt.xlim([0, num_bins])
+		plt.ylim([0, max(histo_r)])
+		plt.bar(range(num_bins), histo_r, color='r');
+		plt.subplot(3, 1, 2)
+		plt.xlim([0, num_bins])
+		plt.ylim([0, max(histo_g)])
+		plt.bar(range(num_bins), histo_g, color='g');
+		plt.subplot(3, 1, 3)
+		plt.xlim([0, num_bins])
+		plt.ylim([0, max(histo_b)])
+		plt.bar(range(num_bins), histo_b, color='b');
+
+	else:
+		print 'Invalid histogram length %u' % len(data)
+		return 1
+
+	plt.suptitle(title)
+	plt.savefig(argv[1].replace('bin', 'png'), dpi=72)
+
+        return 0
+
+
+if __name__ == '__main__':
+        sys.exit(main(sys.argv))
+
-- 
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