to.etc.sjit

Class ImageSubsampler

java.lang.Object

to.etc.sjit.ImageSubsampler

public class ImageSubsampler
extends Object

Subsamples an image to create a smaller (or larger(!)) image. This can use several sampling filters.

Credits:

The algorithms and methods used in this library are based on the article "General Filtered Image Rescaling" by Dale Schumacher which appeared in the book Graphics Gems III, published by Academic Press, Inc.

Performance enhancements: (all in milliseconds)

One	Ten	What was done?
2047	19,812	Initial, slow version sans opt
765	6,719	Using direct-access to BufferedImage's INT RBG buffer for the row sampler only
406	3,531	Using direct-access for the COLUMN resampler..

Author:

Frits Jalvingh

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args)
static BufferedImage	resample(BufferedImage srci, ResamplerFilter f, int ow, int oh) The actual sampler code which converts a source image to a destination image, reducing or enlarging the image.
static Point	resizeWithAspect(int w, int h, int iw, int ih) Does a resize of an object with size (iw, ih) to fit within a rectangle of (w, h) while keeping the same aspect ratio

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

resample

public static BufferedImage resample(BufferedImage srci,
                                     ResamplerFilter f,
                                     int ow,
                                     int oh)

The actual sampler code which converts a source image to a destination image, reducing or enlarging the image. The size reduction does NOT obey aspect ratio rules.

resizeWithAspect

public static Point resizeWithAspect(int w,
                                     int h,
                                     int iw,
                                     int ih)

Does a resize of an object with size (iw, ih) to fit within a rectangle of (w, h) while keeping the same aspect ratio

main

public static void main(String[] args)