Image Processing Toolbox User's Guide |

**Linear Filtering and Transforms**

**Linear Filtering**

`conv2` |
Perform 2-D convolution (MATLAB function) |

`convmtx2` |
Compute 2-D convolution matrix |

`convn` |
Perform N-D convolution (MATLAB function) |

`filter2` |
Perform 2-D filtering (MATLAB function) |

`fspecial` |
Create predefined filters |

`imfilter` |
Multidimensional image filtering |

**Linear 2-D Filter Design**

`freqspace` |
Determine 2-D frequency response spacing (MATLAB function.) |

`freqz2` |
Compute 2-D frequency response |

`fsamp2` |
Design 2-D FIR filter using frequency sampling |

`ftrans2` |
Design 2-D FIR filter using frequency transformation |

`fwind1` |
Design 2-D FIR filter using 1-D window method |

`fwind2` |
Design 2-D FIR filter using 2-D window method |

**Image Transforms**

`dct2` |
Compute 2-D discrete cosine transform |

`dctmtx` |
Compute discrete cosine transform matrix |

`fan2para` |
Convert fan-beam projection data to parallel-beam |

`fanbeam` |
Compute fan-beam transform |

`fft2` |
Compute 2-D fast Fourier transform (MATLAB function) |

`fftn` |
Compute N-D fast Fourier transform (MATLAB function) |

`fftshift` |
Reverse quadrants of output of FFT (MATLAB function) |

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

`ifft2` |
Compute 2-D inverse fast Fourier transform (MATLAB function) |

`ifftn` |
Compute N-D inverse fast Fourier transform (MATLAB function) |

`ifanbeam` |
Compute inverse fan-beam transform |

`iradon` |
Compute inverse Radon transform |

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

`phantom` |
Generate a head phantom image |

`radon` |
Compute Radon transform |

Image Enhancement and Restoration | Morphological Operations |

© 1994-2005 The MathWorks, Inc.