题目内容

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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If the gray levels of an image are coded in a way that uses more code symbols than absolutely necessary to represent each gray level, the resulting image is said to contain （）.

A. spatial redundancy
B. code redundancy
C. interpixel redundancy
D. psychovisually redundancy

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

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

Which one belongs to point operations?

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

If the gray levels of an image are coded in a way that uses more code symbols than absolutely necessary to represent each gray level, the resulting image is said to contain （ ）.

If the gray levels of an image are coded in a way that uses more code symbols than absolutely necessary to represent each gray level, the resulting image is said to contain （）.