When the download is finished, double-click the reaConverter icon and follow the instructions of the Installation Wizard. There is no any file quantity or size limitation for batch conversion in the registered version of reaConverter. If you have any questions, please feel free to contact us. Windows XP, Vista, 7, 8, 10. Split and Tile Image Splitter 2.07 Split any images or pictures into smaller segments without losing any quality. You can split images various ways, including options to split by the number of pixels, or split images into evenly.

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image_dataset_from_directory function

Generates a tf.data.Dataset from image files in a directory.

If your directory structure is:

Then calling image_dataset_from_directory(main_directory, labels='inferred')will return a tf.data.Dataset that yields batches of images fromthe subdirectories class_a and class_b, together with labels0 and 1 (0 corresponding to class_a and 1 corresponding to class_b).

Supported image formats: jpeg, png, bmp, gif.Animated gifs are truncated to the first frame.

Arguments

• directory: Directory where the data is located. If labels is 'inferred', it should contain subdirectories, each containing images for a class. Otherwise, the directory structure is ignored.
• labels: Either 'inferred' (labels are generated from the directory structure), None (no labels), or a list/tuple of integer labels of the same size as the number of image files found in the directory. Labels should be sorted according to the alphanumeric order of the image file paths (obtained via os.walk(directory) in Python).
• label_mode: - 'int': means that the labels are encoded as integers (e.g. for sparse_categorical_crossentropy loss). - 'categorical' means that the labels are encoded as a categorical vector (e.g. for categorical_crossentropy loss). - 'binary' means that the labels (there can be only 2) are encoded as float32 scalars with values 0 or 1 (e.g. for binary_crossentropy). - None (no labels).
• class_names: Only valid if 'labels' is 'inferred'. This is the explict list of class names (must match names of subdirectories). Used to control the order of the classes (otherwise alphanumerical order is used).
• color_mode: One of 'grayscale', 'rgb', 'rgba'. Default: 'rgb'. Whether the images will be converted to have 1, 3, or 4 channels.
• batch_size: Size of the batches of data. Default: 32.
• image_size: Size to resize images to after they are read from disk. Defaults to (256, 256). Since the pipeline processes batches of images that must all have the same size, this must be provided.
• shuffle: Whether to shuffle the data. Default: True. If set to False, sorts the data in alphanumeric order.
• seed: Optional random seed for shuffling and transformations.
• validation_split: Optional float between 0 and 1, fraction of data to reserve for validation.
• subset: One of 'training' or 'validation'. Only used if validation_split is set.
• interpolation: String, the interpolation method used when resizing images. Defaults to bilinear. Supports bilinear, nearest, bicubic, area, lanczos3, lanczos5, gaussian, mitchellcubic.
• follow_links: Whether to visits subdirectories pointed to by symlinks. Defaults to False.
• crop_to_aspect_ratio: If True, resize the images without aspect ratio distortion. When the original aspect ratio differs from the target aspect ratio, the output image will be cropped so as to return the largest possible window in the image (of size image_size) that matches the target aspect ratio. By default (crop_to_aspect_ratio=False), aspect ratio may not be preserved.
• **kwargs: Legacy keyword arguments.

Returns

A tf.data.Dataset object. - If label_mode is None, it yields float32 tensors of shape (batch_size, image_size[0], image_size[1], num_channels), encoding images (see below for rules regarding num_channels). - Otherwise, it yields a tuple (images, labels), where images has shape (batch_size, image_size[0], image_size[1], num_channels), and labels follows the format described below.

Rules regarding labels format: - if label_mode is int, the labels are an int32 tensor of shape (batch_size,). - if label_mode is binary, the labels are a float32 tensor of 1s and 0s of shape (batch_size, 1). - if label_mode is categorial, the labels are a float32 tensor of shape (batch_size, num_classes), representing a one-hot encoding of the class index.

Rules regarding number of channels in the yielded images: - if color_mode is grayscale, there's 1 channel in the image tensors. - if color_mode is rgb, there are 3 channel in the image tensors. - if color_mode is rgba, there are 4 channel in the image tensors.

load_img function

Loads an image into PIL format.

Usage:

Arguments

• path: Path to image file.
• grayscale: DEPRECATED use color_mode='grayscale'.
• color_mode: One of 'grayscale', 'rgb', 'rgba'. Default: 'rgb'. The desired image format.
• target_size: Either None (default to original size) or tuple of ints (img_height, img_width).
• interpolation: Interpolation method used to resample the image if the target size is different from that of the loaded image. Supported methods are 'nearest', 'bilinear', and 'bicubic'. If PIL version 1.1.3 or newer is installed, 'lanczos' is also supported. If PIL version 3.4.0 or newer is installed, 'box' and 'hamming' are also supported. By default, 'nearest' is used.

Returns

A PIL Image instance.

Raises

• ImportError: if PIL is not available.
• ValueError: if interpolation method is not supported.

img_to_array function

Converts a PIL Image instance to a Numpy array.

Usage:

Arguments

• img: Input PIL Image instance.
• data_format: Image data format, can be either 'channels_first' or 'channels_last'. Defaults to None, in which case the global setting tf.keras.backend.image_data_format() is used (unless you changed it, it defaults to 'channels_last').
• dtype: Dtype to use. Default to None, in which case the global settingtf.keras.backend.floatx() is used (unless you changed it, it defaultsto 'float32')

Returns

A 3D Numpy array.

Raises

• ValueError: if invalid img or data_format is passed.

ImageDataGenerator class

Generate batches of tensor image data with real-time data augmentation.

The data will be looped over (in batches).

Arguments

• featurewise_center: Boolean. Set input mean to 0 over the dataset, feature-wise.
• samplewise_center: Boolean. Set each sample mean to 0.
• featurewise_std_normalization: Boolean. Divide inputs by std of the dataset, feature-wise.
• samplewise_std_normalization: Boolean. Divide each input by its std.
• zca_epsilon: epsilon for ZCA whitening. Default is 1e-6.
• zca_whitening: Boolean. Apply ZCA whitening.
• rotation_range: Int. Degree range for random rotations.
• width_shift_range: Float, 1-D array-like or int - float: fraction of total width, if < 1, or pixels if >= 1. - 1-D array-like: random elements from the array. - int: integer number of pixels from interval (-width_shift_range, +width_shift_range) - With width_shift_range=2 possible values are integers [-1, 0, +1], same as with width_shift_range=[-1, 0, +1], while with width_shift_range=1.0 possible values are floats in the interval [-1.0, +1.0).
• height_shift_range: Float, 1-D array-like or int - float: fraction of total height, if < 1, or pixels if >= 1. - 1-D array-like: random elements from the array. - int: integer number of pixels from interval (-height_shift_range, +height_shift_range) - With height_shift_range=2 possible values are integers [-1, 0, +1], same as with height_shift_range=[-1, 0, +1], while with height_shift_range=1.0 possible values are floats in the interval [-1.0, +1.0).
• brightness_range: Tuple or list of two floats. Range for picking a brightness shift value from.
• shear_range: Float. Shear Intensity (Shear angle in counter-clockwise direction in degrees)
• zoom_range: Float or [lower, upper]. Range for random zoom. If a float, [lower, upper] = [1-zoom_range, 1+zoom_range].
• channel_shift_range: Float. Range for random channel shifts.
• fill_mode: One of {'constant', 'nearest', 'reflect' or 'wrap'}. Default is 'nearest'. Points outside the boundaries of the input are filled according to the given mode: - 'constant': kkkkkkkk|abcd|kkkkkkkk (cval=k) - 'nearest': aaaaaaaa|abcd|dddddddd - 'reflect': abcddcba|abcd|dcbaabcd - 'wrap': abcdabcd|abcd|abcdabcd
• cval: Float or Int. Value used for points outside the boundaries when fill_mode = 'constant'.
• horizontal_flip: Boolean. Randomly flip inputs horizontally.
• vertical_flip: Boolean. Randomly flip inputs vertically.
• rescale: rescaling factor. Defaults to None. If None or 0, no rescaling is applied, otherwise we multiply the data by the value provided (after applying all other transformations).
• preprocessing_function: function that will be applied on each input. The function will run after the image is resized and augmented. The function should take one argument: one image (Numpy tensor with rank 3), and should output a Numpy tensor with the same shape.
• data_format: Image data format, either 'channels_first' or 'channels_last'. 'channels_last' mode means that the images should have shape (samples, height, width, channels), 'channels_first' mode means that the images should have shape (samples, channels, height, width). It defaults to the image_data_format value found in your Keras config file at ~/.keras/keras.json. If you never set it, then it will be 'channels_last'.
• validation_split: Float. Fraction of images reserved for validation (strictly between 0 and 1).
• dtype: Dtype to use for the generated arrays.

Raises

• ValueError: If the value of the argument, data_format is other than 'channels_last' or 'channels_first'.
• ValueError: If the value of the argument, validation_split > 1 or validation_split < 0.

Examples

Example of using .flow(x, y):

Example of using .flow_from_directory(directory):

Example of transforming images and masks together.

flow method

Takes data & label arrays, generates batches of augmented data.

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Arguments

• x: Input data. Numpy array of rank 4 or a tuple. If tuple, the first element should contain the images and the second element another numpy array or a list of numpy arrays that gets passed to the output without any modifications. Can be used to feed the model miscellaneous data along with the images. In case of grayscale data, the channels axis of the image array should have value 1, in case of RGB data, it should have value 3, and in case of RGBA data, it should have value 4.
• y: Labels.
• batch_size: Int (default: 32).
• shuffle: Boolean (default: True).
• sample_weight: Sample weights.
• seed: Int (default: None).
• save_to_dir: None or str (default: None). This allows you to optionally specify a directory to which to save the augmented pictures being generated (useful for visualizing what you are doing).
• save_prefix: Str (default: '). Prefix to use for filenames of saved pictures (only relevant if save_to_dir is set).
• save_format: one of 'png', 'jpeg', 'bmp', 'pdf', 'ppm', 'gif', 'tif', 'jpg' (only relevant if save_to_dir is set). Default: 'png'.
• subset: Subset of data ('training' or 'validation') if validation_split is set in ImageDataGenerator.

Returns

An Iterator yielding tuples of (x, y) where x is a numpy array of image data (in the case of a single image input) or a list of numpy arrays (in the case with additional inputs) and y is a numpy array of corresponding labels. If 'sample_weight' is not None, the yielded tuples are of the form (x, y, sample_weight). If y is None, only the numpy array x is returned.

Raises

• ValueError: If the Value of the argument, subset is other than 'training' or 'validation'.

flow_from_dataframe method

Takes the dataframe and the path to a directory + generates batches.

The generated batches contain augmented/normalized data.

A simple tutorial can be found here.

Arguments

• dataframe: Pandas dataframe containing the filepaths relative to directory (or absolute paths if directory is None) of the images in a string column. It should include other column/s depending on the class_mode: - if class_mode is 'categorical' (default value) it must include the y_col column with the class/es of each image. Values in column can be string/list/tuple if a single class or list/tuple if multiple classes. - if class_mode is 'binary' or 'sparse' it must include the given y_col column with class values as strings. - if class_mode is 'raw' or 'multi_output' it should contain the columns specified in y_col. - if class_mode is 'input' or None no extra column is needed.
• directory: string, path to the directory to read images from. If None, data in x_col column should be absolute paths.
• x_col: string, column in dataframe that contains the filenames (or absolute paths if directory is None).
• y_col: string or list, column/s in dataframe that has the target data.
• weight_col: string, column in dataframe that contains the sample weights. Default: None.
• target_size: tuple of integers (height, width), default: (256, 256). The dimensions to which all images found will be resized.
• color_mode: one of 'grayscale', 'rgb', 'rgba'. Default: 'rgb'. Whether the images will be converted to have 1 or 3 color channels.
• classes: optional list of classes (e.g. ['dogs', 'cats']). Default is None. If not provided, the list of classes will be automatically inferred from the y_col, which will map to the label indices, will be alphanumeric). The dictionary containing the mapping from class names to class indices can be obtained via the attribute class_indices.
• class_mode: one of 'binary', 'categorical', 'input', 'multi_output', 'raw', sparse' or None. Default: 'categorical'. Mode for yielding the targets: - 'binary': 1D numpy array of binary labels, - 'categorical': 2D numpy array of one-hot encoded labels. Supports multi-label output. - 'input': images identical to input images (mainly used to work with autoencoders), - 'multi_output': list with the values of the different columns, - 'raw': numpy array of values in y_col column(s), - 'sparse': 1D numpy array of integer labels, - None, no targets are returned (the generator will only yield batches of image data, which is useful to use in model.predict()).
• batch_size: size of the batches of data (default: 32).
• shuffle: whether to shuffle the data (default: True)
• seed: optional random seed for shuffling and transformations.
• save_to_dir: None or str (default: None). This allows you to optionally specify a directory to which to save the augmented pictures being generated (useful for visualizing what you are doing).
• save_prefix: str. Prefix to use for filenames of saved pictures (only relevant if save_to_dir is set).
• save_format: one of 'png', 'jpeg', 'bmp', 'pdf', 'ppm', 'gif', 'tif', 'jpg' (only relevant if save_to_dir is set). Default: 'png'.
• subset: Subset of data ('training' or 'validation') if validation_split is set in ImageDataGenerator.
• interpolation: Interpolation method used to resample the image if the target size is different from that of the loaded image. Supported methods are 'nearest', 'bilinear', and 'bicubic'. If PIL version 1.1.3 or newer is installed, 'lanczos' is also supported. If PIL version 3.4.0 or newer is installed, 'box' and 'hamming' are also supported. By default, 'nearest' is used.
• validate_filenames: Boolean, whether to validate image filenames in x_col. If True, invalid images will be ignored. Disabling this option can lead to speed-up in the execution of this function. Defaults to True.
• **kwargs: legacy arguments for raising deprecation warnings.

Returns

A DataFrameIterator yielding tuples of (x, y)where x is a numpy array containing a batchof images with shape (batch_size, *target_size, channels)and y is a numpy array of corresponding labels.

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flow_from_directory method

Takes the path to a directory & generates batches of augmented data.

Arguments

• directory: string, path to the target directory. It should contain one subdirectory per class. Any PNG, JPG, BMP, PPM or TIF images inside each of the subdirectories directory tree will be included in the generator. See this script for more details.
• target_size: Tuple of integers (height, width), defaults to (256, 256). The dimensions to which all images found will be resized.
• color_mode: One of 'grayscale', 'rgb', 'rgba'. Default: 'rgb'. Whether the images will be converted to have 1, 3, or 4 channels.
• classes: Optional list of class subdirectories (e.g. ['dogs', 'cats']). Default: None. If not provided, the list of classes will be automatically inferred from the subdirectory names/structure under directory, where each subdirectory will be treated as a different class (and the order of the classes, which will map to the label indices, will be alphanumeric). The dictionary containing the mapping from class names to class indices can be obtained via the attribute class_indices.
• class_mode: One of 'categorical', 'binary', 'sparse', 'input', or None. Default: 'categorical'. Determines the type of label arrays that are returned: - 'categorical' will be 2D one-hot encoded labels, - 'binary' will be 1D binary labels, - 'sparse' will be 1D integer labels, - 'input' will be images identical to input images (mainly used to work with autoencoders). - If None, no labels are returned (the generator will only yield batches of image data, which is useful to use with model.predict()). Please note that in case of class_mode None, the data still needs to reside in a subdirectory of directory for it to work correctly.
• batch_size: Size of the batches of data (default: 32).
• shuffle: Whether to shuffle the data (default: True) If set to False, sorts the data in alphanumeric order.
• seed: Optional random seed for shuffling and transformations.
• save_to_dir: None or str (default: None). This allows you to optionally specify a directory to which to save the augmented pictures being generated (useful for visualizing what you are doing).
• save_prefix: Str. Prefix to use for filenames of saved pictures (only relevant if save_to_dir is set).
• save_format: one of 'png', 'jpeg', 'bmp', 'pdf', 'ppm', 'gif', 'tif', 'jpg' (only relevant if save_to_dir is set). Default: 'png'.
• follow_links: Whether to follow symlinks inside class subdirectories (default: False).
• subset: Subset of data ('training' or 'validation') if validation_split is set in ImageDataGenerator.
• interpolation: Interpolation method used to resample the image if the target size is different from that of the loaded image. Supported methods are 'nearest', 'bilinear', and 'bicubic'. If PIL version 1.1.3 or newer is installed, 'lanczos' is also supported. If PIL version 3.4.0 or newer is installed, 'box' and 'hamming' are also supported. By default, 'nearest' is used.

Returns

A DirectoryIterator yielding tuples of (x, y) where x is a numpy array containing a batch of images with shape (batch_size, *target_size, channels) and y is a numpy array of corresponding labels.

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