HotRS.ImageComparison 1.0.9

House on the Rock - Image Comparison Utility

This nuget package is primarily an encapsulation of work done here: https://github.com/xnafan/Simple-image-comparison/blob/master/SimpleImageComparisonClassLibrary/SimpleImageComparisonClassLibrary.csproj

I added a few public methods to simplify usage.

Nuget Link

https://www.nuget.org/packages/HotRS.ImageComparison/

Installation:

Install using Package Manager (or your preferred tool) PM > NuGet\Install-Package HotRS.ImageComparison

Usage

Generate image metadata:

(These are the constructors)

ImageInfo info = new ImageInfo(filename, gridSize);

ImageInfo info = new ImageInfo(Image, gridSize);

Note on the GridSize parameter:

The generation of the HashCode is dependent upon the "GrayValues" calculated in the constructor. The application samples a NxN grid of pixel values (default is 16x16). For file sets of 10k or less, this is probably acceptable. For larger sets of file, you may run into duplicate hashcodes for pictures that are NOT identical. Increasing the grid size will resolve this issue. The downside of a larger gird size is processing time. On a test machine with 32GB ram and a 4ghz quadcore processor, the average processing time at 16 was about 100 ms/file. With a setting of 32 it jumped to 348ms.

ImageInfo includes:

public byte[,] GrayValues

public override string ToString()

public bool Equals(ImageInfo other)

Does this image equal another.

public override int GetHashCode()

GetHashCode() generates a code unique to the image. These codes can later be matched when looking for duplicates or compared for differences within a percentage (finds similar images).