Wednesday, January 18, 2017
 

Color Indexer

Color indexer is alternative to standard color indexing and is 24x~ faster than standard method using php and mysql. On commodity server, in php environment, script can index ~11 images per second. This utility uses opencv library

 

color_indexer application was writeln by me for gallery purposes. It features:

  • Custom pallete support, up-to 200 colors in pallete, that can be changed by recompiling application.
  • Custom treshold value

How to compile?

cd bin/color_indexer/
./compile.sh

Color indexer depends on opencv library, in centos it can be installed by typing

yum install opencv-devel

How to use it?

Usage: color_indexer <image-file-name> <pallete-file-name> <threshold> <inside_height> <inside_width> <method>

Example

./bin/color_indexer/color_indexer bin/color_indexer/forest.jpg doc/color_palletes/color_pallete.txt 25 100 100 rectangle

If you get error executing this command try to install opencv library

yum install opencv

Expected output:

  1. Left variable represents pallete_id
  2. Right item represents how many times color item was matched

<pallete_id>-<count>

10-1477
11-1193
12-391
13-357
14-186
21-59
30-764
40-1345
41-180
48-39
49-95
50-1579
51-308
52-256
60-1553
61-138
62-190
63-89
69-35
70-1229
71-115
72-174
73-179
78-42
79-95
80-1037
81-80
82-120
83-96
89-35
90-547
91-159
100-347
101-59
107-46
110-104
113-34
114-45
115-75
116-167
117-235
118-73
119-46

What is collor_pallete.txt file structure?

<pallete_id>;<red>;<green>;<blue>

Example:

1;213;245;254;20
2;174;235;253;40

Last item is position, but it's optional.

Ellipse uses region like this:

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