This class has static methods for saving histograms.
Text files (actually, any PrintStream, so you could write to standard output
using
java.lang.System.out
) are used to store the histogram information.
Hint: When creating a
java.io.PrintStream
object yourself, set the
autoFlush
argument of the constructor to
false
.
You should also wrap your
java.io.OutputStream
object into a
java.io.BufferedOutputStream
object.
That may speed things up.
A simple format is used for storing the histograms.
The first line holds the number of components.
This would be 3 for a three-dimensional histogram, e.g.for RGB color images,
or 1 for a one-dimensional histogram as used for a grayscale image.
Next, as many lines as dimensions follow.
Each line holds the maximum value allowed for that component.
The minimum value is always zero.
Typically, the maximum values are all the same, e.g. 255 for each
component of a 24 bit RGB truecolor image.
Following these header lines is the actual histogram.
Each line holds a non-zero counter value for one pixel.
The counter is always the last integer value in the line.
Example:
34 0 55 4033
For the histogram of an RGB24Image, this would mean that the pixel
red=34, green=0, blue=55 occurs 4033 times.
0 2
For the histogram of any one channel image, this means that the value 0 occurs twice.