Local ternary patterns: Difference between revisions

Revision as of 00:16, 5 November 2012

Revision as of 22:15, 12 May 2022

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{{refimprove|date=November 2012}}

'''Local ternary patterns''' (LTP) are an extension of [[Local binary patterns]] (LBP).<ref>Xiaoyang Tan and Bill Triggs, Enhanced Local Texture Feature Sets for Face Recognition Under Difficult Lighting Conditions, IEEE Transactions on Image Processing, 19(6), pp. 1635-1650, 2010</ref> Unlike LBP, it does not threshold the pixels into 0 and 1, rather it uses a threshold constant to threshold [[Pixel|pixels]] into three values. Considering k as the threshold constant, c as the value of the center pixel, a neighboring pixel p, the result of threshold is:<br />

<math>

\begin{cases}

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</math>

In this way, each thresholded pixel has one of the three values. Neighboring pixels are combined after thresholding into a ternary pattern. Computing a [[histogram]] of these [[Ternary numeral system|ternary values]] will result in a large range, so the ternary pattern is split into two binary patterns. Histograms are concatenated to generate a descriptor double the size of LBP.

== See also ==