创建一幅1/f谱的噪声图象,输入参数:size,创建图象的大小 factor:调整谱spectrum = 1/(f^factor),factor = 0原始高斯噪声图象,1自然噪声,1.5 云状噪声,>=2,类似血液.

-Creates 1/f spectrum noise images.

im = noiseonf(size, factor)



- size of image to produce

　　　　 factor- controls spectrum = 1/(f^factor)



　　　　 factor = 0　- raw Gaussian noise image

　　　　　　　　= 1　- gives the 1/f `standard　drop-off for `natural　images

　　　　　　　　= 1.5- seems to give the most intersting `cloud patterns

　　　　　　　　= 2 or greater- produces `blobby　images

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