FourierDCTFilter

FourierDCTFilter[image,t]
reduces noise in image by locally thresholding the discrete cosine transforms of overlapping subimages, using the hard threshold t.

DetailsDetails

  • FourierDCTFilter works with arbitrary 2D and 3D images.
  • Local DCT thresholding is applied to all overlapping 16×16 partitions of image. The value of each output pixel is the average of the corresponding pixel in all partitions that include the pixel.
  • For multichannel images, color channels are decorrelated by effectively using a 3D DCT.
  • In FourierDCTFilter[image,t], the threshold value t is typically in the range 0 to 1.

ExamplesExamplesopen allclose all

Basic Examples  (3)Basic Examples  (3)

Denoise a color image:

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Denoise a grayscale image:

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Denoise a 3D image:

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Introduced in 2012
(9.0)
| Updated in 2014
(10.0)