imbinarize

Binarize image using a threshold.

📝Syntax

BW = imbinarize(I)
BW = imbinarize(I, T)
BW = imbinarize(I, 'global')
BW = imbinarize(I, 'adaptive')
BW = imbinarize(__, 'Sensitivity', value)
BW = imbinarize(__, 'ForegroundPolarity', polarity)

📥Input Arguments

Parameter	Description
I	Input image.
T	Numeric threshold. It can be scalar or the same size as I.
method	Binarization method: 'global' or 'adaptive'.
'Sensitivity'	Sensitivity passed to adaptive thresholding.
'ForegroundPolarity'	Foreground polarity for adaptive thresholding: 'bright' or 'dark'.

📤Output Arguments

Parameter	Description
BW	Logical binary image.

📄Description

Binarize image using a threshold. The global method uses graythresh when no threshold is supplied. A numeric threshold can be scalar or the same size as the input. The adaptive method uses adaptthresh and supports bright or dark foreground polarity.

💡Examples

Binarize a grayscale image using a global threshold

I=[0 0.25 0.75 1; 0.1 0.4 0.6 0.9];
BW=imbinarize(I,0.5);
figure; subplot(1,2,1); imagesc(I); g=linspace(0,1,64)'; colormap([g g g]); title('Input');
subplot(1,2,2); imagesc(BW); g=linspace(0,1,64)'; colormap([g g g]); title('Binary');

Binarize using an adaptive threshold

I=[0.1 0.1 0.1; 0.1 0.9 0.1; 0.1 0.1 0.1];
BW=imbinarize(I,'adaptive','Sensitivity',0.4)

🔗See Also

graythresh adaptthresh imcomplement

🕔Version History

Version	Description
2.0.0	initial version

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