White noise is a random signal (or process) with a flat power spectral density. In other words, the signal contains equal power within a fixed bandwidth at any center frequency. White noise draws its name from white light in which the power spectral

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Matlab中的图像处理实例，降噪，颜色提取，对比度增强，可以参考(Matlab image processing examples, noise reduction, color extraction, contrast enhancement, can be referred to)