ThresholdLocally

Version 1.4.0.1 (2,86 ko) par Brett Shoelson
Performs LOCAL Otsu thresholding on an image, with a user-specified blocksize.
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Mise à jour 1 sept. 2016

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Performs LOCAL Otsu thresholding on an image; user can specify blocksize. Facilitates the threshold-segmentation of images with uneven illumination, without the need for background normalization.

SYNTAX: B = thresholdLocally(A,blksz,varargin)

THRESHOLDLOCALLY processes an image, calling graythresh on LOCAL blocks in an image. This facilitates easy thresholding of images with uneven background illumination, for which global thresholding is inadequate. Uses the Image Processing Toolbox function BLOCKPROC (R2009b).

INPUTS:
A: Any image (or path/name of an image) suitable for processing with im2bw()
BLKSZ: (Optional) Block size of A, for determination of Otsu thresholding using graythresh(). In the form or [M,N]. Default is as determined by BESTBLK.
OPTIONAL:
1) Any P-V pair accepted by BLOCKPROC.
2) FudgeFactor: a scalar value by which to multiply the local value returned by graythresh.

OUTPUT:
B: Output image

EXAMPLE:
img = imread('rice.png');
thresholded = thresholdLocally(img);

Citation pour cette source

Brett Shoelson (2024). ThresholdLocally (https://www.mathworks.com/matlabcentral/fileexchange/29764-thresholdlocally), MATLAB Central File Exchange. Récupéré le .

Compatibilité avec les versions de MATLAB
Créé avec R2010b
Compatible avec toutes les versions
Plateformes compatibles
Windows macOS Linux

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Version Publié le Notes de version
1.4.0.1

Updated license
1.4.0.0

Minor change to replace default blocksize of [32 32] by that returned by function BESTBLK.
1.3.0.0

Fixed problem with screenshot. (Image was inappropriately rotated.)
1.2.0.0

Modified significantly to accept as optional inputs all parameter-value pairs accepted by BLOCKPROC, as well as an additional "fudge factor" parameter that allows one to scale the local graythresh value by a scalar multiple.
1.0.0.0