feature_extraction
Class ImageScaling

java.lang.Object
  feature_extraction.ImageScaling

public class ImageScaling
extends java.lang.Object

This class performs image scaling

Author:

Eleftherios Spyromitros-Xioufis

Field Summary

private boolean	higherQuality If true, this class will use a multi-step scaling technique that provides higher quality than the usual one-step technique (only useful in downscaling cases and generally only when the BILINEAR hint is specified)
private java.lang.Object	hint One of the rendering hints that corresponds to RenderingHints.KEY_INTERPOLATION (e.g.
private int	targetSize Depending on the method that will be called for scaling the image, the targetSize corresponds to: a.

Constructor Summary

ImageScaling()
Constructor with no arguments, all fields take the default values

ImageScaling(int targetSize)

ImageScaling(int targetSize, boolean highQuality, java.lang.Object hint)

ImageScaling(java.lang.String scalingTypeParameter, java.lang.String scalingSizeParameter)

Method Summary

static void	advancedUse()
static void	main(java.lang.String[] args)
java.awt.image.BufferedImage	maxPixelsScaling(java.awt.image.BufferedImage img) This method returns a scaled instance of the provided BufferedImage.
java.awt.image.BufferedImage	rectScaling(java.awt.image.BufferedImage img) This method returns a scaled instance of the provided BufferedImage.
java.awt.image.BufferedImage	rectScaling(java.lang.String imageFilename) Same as rectScaling(BufferedImage) but takes the imageFileName instead of a BufferedImage.
java.awt.image.BufferedImage	squareScaling(java.awt.image.BufferedImage img) This method returns a scaled instance of the provided BufferedImage.
java.awt.image.BufferedImage	squareScaling(java.lang.String imageFilename) Same as squareScaling(BufferedImage) but takes the imageFileName instead of a BufferedImage.

Methods inherited from class java.lang.Object

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

Field Detail

targetSize

private int targetSize

Depending on the method that will be called for scaling the image, the targetSize corresponds to:

 a. The total number of pixels.
 b. The dimension of a square thumbnail in pixels.
 c. The larger dimension of a rectangular thumbnail in pixels.
 

higherQuality

private boolean higherQuality

If true, this class will use a multi-step scaling technique that provides higher quality than the usual one-step technique (only useful in downscaling cases and generally only when the BILINEAR hint is specified)

hint

private java.lang.Object hint

One of the rendering hints that corresponds to RenderingHints.KEY_INTERPOLATION (e.g. RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR, RenderingHints.VALUE_INTERPOLATION_BILINEAR, RenderingHints.VALUE_INTERPOLATION_BICUBIC)

Constructor Detail

ImageScaling

public ImageScaling()

Constructor with no arguments, all fields take the default values

ImageScaling

public ImageScaling(int targetSize)

ImageScaling

public ImageScaling(int targetSize,
                    boolean highQuality,
                    java.lang.Object hint)

ImageScaling

public ImageScaling(java.lang.String scalingTypeParameter,
                    java.lang.String scalingSizeParameter)

Method Detail

maxPixelsScaling

public java.awt.image.BufferedImage maxPixelsScaling(java.awt.image.BufferedImage img)

This method returns a scaled instance of the provided BufferedImage. The image is scaled to a maximum of targetSize pixels in total by keeping the aspect ratio.

Parameters:

img - the original image to be scaled

Returns:

a scaled version of the original BufferedImage or the original image if no scaling was applied

squareScaling

public java.awt.image.BufferedImage squareScaling(java.awt.image.BufferedImage img)

This method returns a scaled instance of the provided BufferedImage. The image is scaled so that its minimum dimension becomes targetSize pixels and then the larger dimension is cropped, again to targetSize pixels to create a square thumbnail.

Parameters:

img - the original image to be scaled

Returns:

a scaled version of the original BufferedImage or the original image if no scaling was applied

squareScaling

public java.awt.image.BufferedImage squareScaling(java.lang.String imageFilename)
                                           throws java.io.IOException

Same as squareScaling(BufferedImage) but takes the imageFileName instead of a BufferedImage.

Parameters:

imageFilename -

Returns:

Throws:

java.io.IOException

rectScaling

public java.awt.image.BufferedImage rectScaling(java.awt.image.BufferedImage img)

This method returns a scaled instance of the provided BufferedImage. The image is scaled so that its maximum dimension becomes targetSize pixels.

Parameters:

img - the original image to be scaled

Returns:

a scaled version of the original BufferedImage or the original image if no scaling was applied

rectScaling

public java.awt.image.BufferedImage rectScaling(java.lang.String imageFilename)
                                         throws java.io.IOException

Same as rectScaling(BufferedImage) but takes the imageFileName instead of a BufferedImage.

Parameters:

imageFilename -

Returns:

Throws:

java.io.IOException

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

Throws:

java.io.IOException

advancedUse

public static void advancedUse()
                        throws java.io.IOException

Throws:

java.io.IOException