Alpha-numeric text.

(txt2)

The original image.

(txt2msk1)

Mask for txt2 containing only the letter X.

(txt2fur1)

Result of scaling the Fourier transform of txt2msk1 and thresholding it at a value of 10. (See frequency filter worksheet.)

(txt2fil1)

Result of Fourier Transforming txt2 and txt2msk1, multiplying the images, applying an inverse Fourier Transform to the multiplied image, and, finally, scaling the spatial domain image.

(txt2fil2)

Result of thresholding txt2fil1 at the value 255.

(txt2fil3)

Result of multiplying txt2fur1 and the Fourier Transform of txt2, and then applying an inverse Fourier transform to the multiplied image.

(txt2fil4)

Result of thresholding txt2fil3.

©2003 R. Fisher, S. Perkins, A. Walker and E. Wolfart.