首页>
外国专利>
IMAGE NOISE REDUCTION SYSTEM USING A WIENER VARIANT FILTER IN A PYRAMID IMAGE REPRESENTATION
IMAGE NOISE REDUCTION SYSTEM USING A WIENER VARIANT FILTER IN A PYRAMID IMAGE REPRESENTATION
展开▼
机译:在金字塔形图像表示中使用维纳变量滤波器的图像降噪系统
展开▼
页面导航
摘要
著录项
相似文献
摘要
The invention relates to a novel process and system for removing noise from an image by first noise modeling an image signal source to generate noise masks and LUT values characteristic of noise at different frequency levels for each channel, and then applying the stored noise masks and LUT values to an image signal for noise removal. The image is first captured as an electronic image signal by the image signal source, then represented by a pyramid structure whereby each successive level of the pyramid is constructed from DC values of the previous level, and each level of the pyramid corresponds to a different frequency band of the image signal. A Wiener variant filter using DCT transforms is used to filter DCT coefficients at each level. The image is restored with reduced noise by replacing DC values with next level IDCT coefficients then performing an IDCT on the results.
展开▼