CODEWITHSUNDEEP
opencvimage-processing
Ruckus
Ruckus

Reputation: 31

Gaussian adaptive thresholding

In Gaussian adaptive thresholding, the threshold is calculated according to the local area in the image. What is the algorithm used in Gaussian adaptive thresholding?

Upvotes: 0

Views: 4007

Answers (1)

Piglet
Piglet

Reputation: 28950

From the OpenCV manual:

Adaptive Thresholding

void cv::adaptiveThreshold  (   InputArray  src,
OutputArray     dst,
double  maxValue,
int     adaptiveMethod,
int     thresholdType,
int     blockSize,
double  C 
)

where T(x,y) is a threshold calculated individually for each pixel (see adaptiveMethod parameter)....

adaptiveMethod Adaptive thresholding algorithm to use, see cv::AdaptiveThresholdTypes. The BORDER_REPLICATE | BORDER_ISOLATED is used to process boundaries.

the threshold value T(x,y) is a weighted sum (cross-correlation with a Gaussian window) of the blockSize×blockSize neighborhood of (x,y) minus C . The default sigma (standard deviation) is used for the specified blockSize . See cv::getGaussianKernel

For even better information read the source code:

https://github.com/opencv/opencv/blob/master/modules/imgproc/src/thresh.cpp

Upvotes: 2

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