The 2-D DFT can be computed by computing 1-D DFT transforms along the rows of the image, followed by 1-D transforms along the columns of the result.
举一反三
- If a is known to be a 2×3 matrix, then after executing a=a(:), ( ). A: a transforms to a column vector B: a transforms to 3 rows and 2 columns C: a transforms to 3 rows and 3 columns D: a transforms to 2 rows 3 and columns
- Which one is right about wavelet transforms? A: Wavelet transforms store large fractions of the strongest of the wavelet coefficients. B: Wavelet transforms are completely different from discrete Fourier transform (DFT). C: Each transform has 2 functions: smoothing, difference. D: Wavelet transforms means applying to pairs of data, resulting in two set of data of length L.
- If it is known that A is a 3×5 matrix, after executing A(:,1:2:3)=[], ( ). A: A becomes row vector B: A becomes 3 rows and 3 columns C: A becomes 3 rows and 2 columns D: A becomes 2 rows and 3 columns
- 已知x1[k]={2, 1, 1, 2}的DFT是X1[m]...0, 2, 0}的DFT X[m]= 。
- 工作在电感电流连续（CCM）情况下的降压变换器（Buck），输出电压Vo对输入电压Vin的比值是 ______（令主开关管的PWM驱动占空比为D） A: D B: 1-D C: 1/{1-D} D: D/(1-D）