net.semanticmetadata.lire.utils

类 ImageUtils

java.lang.Object

net.semanticmetadata.lire.utils.ImageUtils

public class ImageUtils
extends java.lang.Object

Some little helper methods.
This file is part of the Caliph and Emir project: http://www.SemanticMetadata.net
Date: 02.02.2006
Time: 23:33:36

作者:

Mathias Lux, mathias@juggle.at

构造器概要

构造器

构造器和说明
ImageUtils()

方法概要

限定符和类型	方法和说明
static java.awt.image.BufferedImage	createWorkingCopy(java.awt.image.BufferedImage bimg) Converts an image to a standard internal representation.
static java.awt.image.BufferedImage	cropImage(java.awt.image.BufferedImage image, int fromX, int fromY, int width, int height)
static java.awt.image.BufferedImage	denoiseImage(java.awt.image.BufferedImage img) Non-local means denoising.
static java.awt.image.BufferedImage	differenceOfGaussians(java.awt.image.BufferedImage image)
static java.awt.image.BufferedImage	get8BitRGBImage(java.awt.image.BufferedImage bufferedImage) Check if the image is fail safe for color based features that are actually using 8 bits per pixel RGB.
static java.awt.image.BufferedImage	getGrayscaleImage(java.awt.image.BufferedImage image) Converts an image to grey.
static void	invertImage(java.awt.image.BufferedImage image) Inverts a grey scale image.
static float[]	makeGaussianKernel(int radius, float sigma) creates a Gaussian kernel for ConvolveOp for blurring an image
static java.awt.image.BufferedImage	removeScratches(java.awt.image.BufferedImage img)
static java.awt.image.BufferedImage	scaleImage(java.awt.image.BufferedImage image, int maxSideLength) Scales down an image into a box of maxSideLength x maxSideLength.
static java.awt.image.BufferedImage	scaleImage(java.awt.image.BufferedImage image, int width, int height) Scale image to an arbitrary shape not retaining proportions and aspect ratio.
static java.awt.image.BufferedImage	thresholdImage(java.awt.image.BufferedImage image, int threshold) Converts an image (RGB, RGBA, ... whatever) to a binary one based on given threshold
static java.awt.image.BufferedImage	trimWhiteSpace(java.awt.image.BufferedImage img) Trims the white border around an image.
static java.awt.image.BufferedImage	trimWhiteSpace(java.awt.image.BufferedImage src, java.awt.image.BufferedImage tgt, int whiteThreshold, int startTop, int startRight, int startBottom, int startLeft)
static java.awt.image.BufferedImage	trimWhiteSpace(java.awt.image.BufferedImage img, int whiteThreshold, int startTop, int startRight, int startBottom, int startLeft) Trims the white border around an image.

从类继承的方法 java.lang.Object

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

构造器详细资料

ImageUtils

public ImageUtils()

方法详细资料

scaleImage

public static java.awt.image.BufferedImage scaleImage(java.awt.image.BufferedImage image,
                                                      int maxSideLength)

Scales down an image into a box of maxSideLength x maxSideLength.

参数:

image - the image to scale down. It remains untouched.

maxSideLength - the maximum side length of the scaled down instance. Has to be > 0.

返回:

the scaled image if the original image is bigger than the scaled version, the original instance otherwise.

scaleImage

public static java.awt.image.BufferedImage scaleImage(java.awt.image.BufferedImage image,
                                                      int width,
                                                      int height)

Scale image to an arbitrary shape not retaining proportions and aspect ratio.

参数:

image -

width -

height -

返回:

cropImage

public static java.awt.image.BufferedImage cropImage(java.awt.image.BufferedImage image,
                                                     int fromX,
                                                     int fromY,
                                                     int width,
                                                     int height)

getGrayscaleImage

public static java.awt.image.BufferedImage getGrayscaleImage(java.awt.image.BufferedImage image)

Converts an image to grey. Use instead of color conversion op, which yields strange results.

参数:

image -

invertImage

public static void invertImage(java.awt.image.BufferedImage image)

Inverts a grey scale image.

参数:

image -

createWorkingCopy

public static java.awt.image.BufferedImage createWorkingCopy(java.awt.image.BufferedImage bimg)

Converts an image to a standard internal representation. Taken from OpenIMAJ. Thanks to these guys! http://sourceforge.net/p/openimaj

参数:

bimg -

返回:

trimWhiteSpace

public static java.awt.image.BufferedImage trimWhiteSpace(java.awt.image.BufferedImage img)

Trims the white border around an image.

参数:

img -

返回:

a new image, hopefully trimmed.

trimWhiteSpace

public static java.awt.image.BufferedImage trimWhiteSpace(java.awt.image.BufferedImage img,
                                                          int whiteThreshold,
                                                          int startTop,
                                                          int startRight,
                                                          int startBottom,
                                                          int startLeft)

Trims the white border around an image.

参数:

img -

返回:

a new image, hopefully trimmed.

trimWhiteSpace

public static java.awt.image.BufferedImage trimWhiteSpace(java.awt.image.BufferedImage src,
                                                          java.awt.image.BufferedImage tgt,
                                                          int whiteThreshold,
                                                          int startTop,
                                                          int startRight,
                                                          int startBottom,
                                                          int startLeft)

denoiseImage

public static java.awt.image.BufferedImage denoiseImage(java.awt.image.BufferedImage img)

Non-local means denoising.

参数:

img -

返回:

removeScratches

public static java.awt.image.BufferedImage removeScratches(java.awt.image.BufferedImage img)

makeGaussianKernel

public static float[] makeGaussianKernel(int radius,
                                         float sigma)

creates a Gaussian kernel for ConvolveOp for blurring an image

参数:

radius - the radius, i.e. 5

sigma - sigma, i.e. 1.4f

返回:

differenceOfGaussians

public static java.awt.image.BufferedImage differenceOfGaussians(java.awt.image.BufferedImage image)

thresholdImage

public static java.awt.image.BufferedImage thresholdImage(java.awt.image.BufferedImage image,
                                                          int threshold)

Converts an image (RGB, RGBA, ... whatever) to a binary one based on given threshold

参数:

image - the image to convert. Remains untouched.

threshold - the threshold in [0,255]

返回:

a new BufferedImage instance of TYPE_BYTE_GRAY with only 0'S and 255's

get8BitRGBImage

public static java.awt.image.BufferedImage get8BitRGBImage(java.awt.image.BufferedImage bufferedImage)

Check if the image is fail safe for color based features that are actually using 8 bits per pixel RGB.

参数:

bufferedImage -

返回: