View source: R/open_image_rscript.R

Augmentation | R Documentation |

image augmentations of a matrix, data frame, array or a list of 3-dimensional arrays (where the third dimension is equal to 3)

Augmentation( image, flip_mode = NULL, crop_width = NULL, crop_height = NULL, resiz_width = 0, resiz_height = 0, resiz_method = "nearest", shift_rows = 0, shift_cols = 0, rotate_angle = 0, rotate_method = "nearest", zca_comps = 0, zca_epsilon = 0, image_thresh = 0, padded_value = 0, verbose = FALSE )

`image` |
a matrix, data frame, array or list of 3-dimensional arrays where the third dimension is equal to 3 |

`flip_mode` |
a character string ('horizontal', 'vertical') |

`crop_width` |
an integer specifying the new width of the image, after the image is cropped. Corresponds to the image-rows. |

`crop_height` |
an integer specifying the new height of the image, after the image is cropped. Corresponds to the image-columns. |

`resiz_width` |
an integer specifying the new width of the image, after the image is resized. Corresponds to the image-rows. |

`resiz_height` |
an integer specifying the new height of the image, after the image is resized. Corresponds to the image-columns. |

`resiz_method` |
a string specifying the interpolation method when resizing an image ('nearest', 'bilinear') |

`shift_rows` |
a positive or negative integer specifying the direction that the rows should be shifted |

`shift_cols` |
a positive or negative integer specifying the direction that the columns should be shifted |

`rotate_angle` |
an integer specifying the rotation angle of the image |

`rotate_method` |
a string specifying the interpolation method when rotating an image ('nearest', 'bilinear') |

`zca_comps` |
an integer specifying the number of components to keep by zca whitening, when svd is performed |

`zca_epsilon` |
a float specifying the regularization parameter by zca whitening |

`image_thresh` |
the threshold parameter, by image thresholding, should be between 0 and 1 if the data is normalized or between 0-255 otherwise |

`padded_value` |
either a numeric value or a numeric vector of length equal to N of an N-dimensional array. If it's not equal to 0 then the values of the shifted rows or columns will be filled with the user-defined padded_value. Applies only to the shift_rows and shift_cols parameters. |

`verbose` |
a boolean (TRUE, FALSE). If TRUE, then the total time of the preprocessing task will be printed. |

This function takes advantage of various methods to accomplish image augmentations. The order of the preprocessing steps, in case that all transformations are applied to an image, is : 1st flip image, 2nd crop image, 3rd resize image, 4th shift rows or columns, 5th rotate image, 6th zca-whitening and 7th image-thresholding.

the output is of the same type with the input (in case of a data frame it returns a matrix)

Lampros Mouselimis

## Not run: # a matrix object = matrix(1, 10, 10) res = Augmentation(object, resiz_width = 8, resiz_height = 8, rotate_angle = 40) # an array object = array(0, dim = c(10, 10, 3)) res = Augmentation(object, resiz_width = 8, resiz_height = 8, rotate_angle = 30) # an array (multiple matrices) object = array(0, dim = c(10, 10, 10)) res = Augmentation(object, resiz_width = 8, resiz_height = 8, rotate_angle = 20) # a list of 3-dimensional arrays (where the third dimension is equal to 3) object = list(array(0, dim = c(10, 10, 3)), array(0, dim = c(10, 10, 3))) res = Augmentation(object, resiz_width = 8, resiz_height = 8, rotate_angle = 40) ## End(Not run)

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