Texture
Purpose
Run texture analysis on an image or group of images.
Synopsis
- [y] = texture(img,'autocor_img');
- [y,model] = texture(img,'autocor_img');
- [y,s,model] = texture(img,'semivar', options);%addtional s output
- [y,model] = texture(img,'svd_texture', options, nn);%Additional input
- y = texture(img,model);%Apply new data to model.
Description
TEXTURE will perform an analysis on any 2 dimensional (m x n pixels) layer of an image or group of images. It loops through input 'img' where mode 3 is considered the variables (slabs of an image) mode and mode 4 is considered the images mode. Any additional inputs to the chosen 'method' must be added after the options input.
Outputs are 'y' a dataset with each row corresponding to an image and varargout containing any secondary output from the selected method. Outputs for a 'method' must be designated by the user with options.numout. Outputs will be appended together forming one row vector per image. E.G. for 'anglemt' if options.numout = [2 1] then the y{2} and y{1} outputs of 'anglemt' will be concatenated to form the row. Only the first output of a function is used. If there is a second output of a function it is assigned to varargout.
Aggregation can be performed across variables (slabs/layers) and or across images. For example, setting options.varmode = 'sum' will sum the layer of an image into one layer.
Inputs
- img = image data (matrix or DataSet). The first two modes must be pixels, the third mode must be variables, and the fourth mode must be images.
- method = texture method ('anglemt' 'autocor_img' 'svd_texture' 'fft_texture' 'semivar').
Optional Inputs
- varargin = additional input needed for selected 'method'.
Outputs
- y = dataset where each row (spectra) corresponds to an image.
- s = second output of texture function (e.g., for semivar this would be the distance scales).
- model = standard model structure for texture.
Options
options = a structure array with the following fields:
- numout: [{1}] 1xK vector. Number and order of outputs from selected 'method' to use.
- imgmode: [ {'none'} | 'sum' | 'mean' ] aggregation across images.
- varmode: [ {'none'} | 'sum' | 'mean' ] aggregation across variables.
TEXTURE FUNCTION SUB-STRUCTURES These options can be assigned in their nested form. See the particular function for a full description of available options. For example:
- options.svd_texture.incr = 2;