Perform Fourier, Discrete Cosine, Radon, and Fan-beam
transforms

`bwdist` |
Distance transform of binary image |

`bwdistgeodesic` |
Geodesic distance transform of binary image |

`graydist` |
Gray-weighted distance transform of grayscale image |

`hough` |
Hough transform |

`dct2` |
2-D discrete cosine transform |

`dctmtx` |
Discrete cosine transform matrix |

`fan2para` |
Convert fan-beam projections to parallel-beam |

`fanbeam` |
Fan-beam transform |

`idct2` |
2-D inverse discrete cosine transform |

`ifanbeam` |
Inverse fan-beam transform |

`iradon` |
Inverse Radon transform |

`para2fan` |
Convert parallel-beam projections to fan-beam |

`radon` |
Radon transform |

`fft2` |
2-D fast Fourier transform |

`fftshift` |
Shift zero-frequency component to center of spectrum |

`ifft2` |
2-D inverse fast Fourier transform |

`ifftshift` |
Inverse FFT shift |

**Detect Lines Using the Radon Transform**

This example shows how to use the Radon transform to detect lines in an image.

**Reconstructing an Image from Parallel Projection Data**

The commands below illustrate how to reconstruct an image from parallel projection data.

**Reconstruct Image using Inverse Fanbeam Projection**

This example shows how to use `fanbeam`

and `ifanbeam`

to form projections from a sample image and then reconstruct the image from the projections.

Defines the Fourier transform and some of its applications in image processing

Describes the discrete cosine transform (DCT) of an image and its application, particularly in image compression

Describes how the `radon`

function
computes projections of an image matrix along specified directions

**The Inverse Radon Transformation**

Describes how the `iradon`

function
reconstructs images from projection data

**Inverse Radon Transform Definition**

The `iradon`

function inverts the Radon transform and can therefore be used to reconstruct images.

Describes how the `fanbeam`

function
computes projections of an image matrix along paths that radiate from
a specific source

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