Description: Ch4_1_4: zero padding on f (area size of 256 * 256), and then the two-dimensional fast Fourier transform (§ 4.1.2)
Ch4_1_5: transform the result of zero frequency component is located in the center, calling function fftshift (§ 4.1.2)
Ch4_1_6: product to make use of the function ifft2 inverse discrete Fourier transform (§ 4.1.3)
Ch4_1_7: get in the image text. Corresponding to the letter "a" in PNG positioning results (§ 4.1.3)
Ch4_2_1: an image for discrete cosine transform (§ 2)
Ch4_2_2: JPEG image compression (§ 4.2.2)
Ch4_3_1: a square image at 0 ° and 45 ° direction on the Radon transform (§ 4.3.1)
Ch4_3_2: calculate square image from 0 ° to 180 ° every 1 ° to calculate a Radon transform command (§ 4.3.1)
Ch4_3_3: straight line detection (§ 4.3.1)
Ch4_3_4: using the radon function and iradon function structure of a simple image projection and reconstruction of images (§ 4.3.2)
Ch4_4_1, mapping and reconstruction images (§ 4.4.1)
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