---
title: "Local ternary patterns"
chunk: 1/1
source: "https://en.wikipedia.org/wiki/Local_ternary_patterns"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T11:35:53.332732+00:00"
instance: "kb-cron"
---

Local ternary patterns (LTP) are an extension of local binary patterns (LBP). Unlike LBP, it does not threshold the pixels into 0 and 1, rather it uses a threshold constant to threshold 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:

  
    
      
        
          
            {
            
              
                
                  1
                  ,
                
                
                  
                    if 
                  
                  p
                  >
                  c
                  +
                  k
                
              
              
                
                  0
                  ,
                
                
                  
                    if 
                  
                  p
                  >
                  c
                  −
                  k
                  
                     and 
                  
                  p
                  <
                  c
                  +
                  k
                
              
              
                
                  −
                  1
                
                
                  
                    if 
                  
                  p
                  <
                  c
                  −
                  k
                
              
            
            
          
        
      
    
    {\displaystyle {\begin{cases}1,&{\text{if }}p>c+k\\0,&{\text{if }}p>c-k{\text{ and }}p<c+k\\-1&{\text{if }}p<c-k\\\end{cases}}}
  

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 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 ==
Local binary patterns


== References ==