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Bilinear interpolation is first-order interpolation.

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High frequency of the spectrum of 2-dimensional discrete Fourier transform reflects the edge or noise of the image.

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If a digital image covers a broad range of the gray scale, then it has low contrast.

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Which one belongs to point operations?

A. direct gray scale transform
B. sobel operators
C. fourier transform
D. median filters

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For the smoothing filters in spatial domain, which of the following statements is true?

A. The principle is mask convolution.
B. The sign of each coefficient of the mask is positive.
C. The sum of all coefficients of the mask is 0.
D. The function is to denoise image.

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