IEVisionCompareHashes

Declaration

function IEVisionCompareHashes(const Hash1, Hash2: AnsiString; Algorithm: TIEVisionImageHashAlgorithm = ievHashPHash): Double;

Description

Returns the similarity of two perceptual hash strings (created with GetPerceptualHash or IEVisionHashToStr) in the range 0 (unrelated) to 1 (identical).
A result of 0.75 or higher means the images are the same or near-duplicates. See similarity.
Both hashes must have been created with Algorithm, otherwise an exception is raised.

Example

// Is the image already in our database?
hash := ImageEnView1.IEBitmap.GetPerceptualHash();
for i := 0 to ssStoredHashes.Count - 1 do
if IEVisionCompareHashes( hash, AnsiString( ssStoredHashes[ i ] )) >= 0.75 then
ShowMessage( 'Similar to image ' + IntToStr( i ));

IEVisionCompareHashes