TImageEnMView.RemoveDuplicates

Declaration

function RemoveDuplicates(): Integer; overload;
function RemoveDuplicates(Threshold: Double; Algorithm: TIEVisionImageHashAlgorithm = ievHashPHash): Integer; overload;

Description

Locate images with duplicate content in the TImageEnMView and remove other instances. The first image of each group of duplicates is kept.
Returns the number of removed pages.

The first overload only finds images with exactly the same pixels (using an MD5 Hash).
The second overload (requires IEVision) uses a perceptual hash, so it also removes near-duplicates, such as resized, recompressed or slightly edited copies. An image is a duplicate if its similarity to an earlier image is Threshold or higher (0 to 1, where 0.75 is a good value. See similarity). It works with any StoreType (images loaded on demand are loaded to be hashed, and thumbnails are hashed as they are).

Note:
◼The first overload does not call OnDestroyImage
◼Cannot be used if a TIEDBMultiBitmap is attached to the control

Examples

// Ensure there are no duplicate images in our TImageEnMView after filling it from a folder
ImageEnMView1.Clear();
ImageEnMView1.StoreType := ietNormal;
ImageEnMView1.FillFromDirectory('C:\Images');
ImageEnMView1.RemoveDuplicates();

// Also remove resized and recompressed copies
ImageEnMView1.RemoveDuplicates( 0.75 );

See Also

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