Histogram Property

Summary

An array of 32-bit integers that charts the number of times each intensity level occurs in the image.

Syntax

Objective-C

C++/CLI

Java

Python

public long[] Histogram { get; }

@property (nonatomic, assign, readonly, nullable) uint64_t *histogram NS_RETURNS_INNER_POINTER;

public long[] getHistogram();

public: 
property array<int64>^ Histogram { 
   array<int64>^ get(); 
}

Histogram # get  (HistogramCommand)

Property Value

An array of 64-bit integers that charts the number of times each intensity level occurs in the image.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
 
 
public void HistogramCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg")); 
 
   // Prepare the command 
   HistogramCommand command = new HistogramCommand(); 
   long[] histogramValues; 
   //Create the red-channel histogram. 
   command.Channel = HistogramCommandFlags.Red | HistogramCommandFlags.AllBits; 
   command.Run(image); 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
   histogramValues = command.Histogram; 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.color.*; 
 
 
public void histogramCommandExample() { 
 
    final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
 
    // Load an image 
    RasterCodecs codecs = new RasterCodecs(); 
    codecs.setThrowExceptionsOnInvalidImages(true); 
 
    RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "Master.jpg")); 
 
    // Prepare the command 
    HistogramCommand command = new HistogramCommand(); 
    long[] histogramValues; 
    // Create the red-channel histogram 
    command.setChannel(HistogramCommandFlags.RED.getValue() | HistogramCommandFlags.ALL_BITS.getValue()); 
    command.run(image); 
    histogramValues = command.getHistogram(); 
 
    System.out.println("Histogram Array Length: " + histogramValues.length); 
    assertTrue(histogramValues.length != 0); 
 
}

Requirements

Target Platforms

Reference

HistogramCommand Class

HistogramCommand Members

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Help Version 23.0.2024.3.3

Leadtools.ImageProcessing.Color Assembly

Introduction

Getting Started

Namespaces

Leadtools.ImageProcessing.Color Namespace

Assemblies