Functions > Image Processing > Transform Domain > Example: Centering a Transformed Image
Example: Centering a Transformed Image
Use the center function for rearranging the Fourier transform of an image so that the DC component (image average) is centered and the high frequencies are moved to the edges.
For information on using this example, refer to About Image Processing Examples.
1. Use the READ_IMAGE function to read in an image.
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2. Use the dft function to take the complex two-dimensional Fourier transform and set the DC component to 0 so that the detail in the rest of the transform is visible.
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3. Use the scale function to rescale the image to a grayscale intensity scale.
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4. Use the equalize function to adjust the grayscale.
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5. Use the WRITEBMP function to write the result to an external file.
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6. Use the center function to recenter the DC components and write the result to an external file.
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The higher frequency components are placed outside the image.
7. Compare the original image, transform, and recentered transform.
(astrsk.bmp)
(astrsk_equalized.bmp)
(astrsk_center.bmp)
Recentering an Image
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