TImageEnProc.CompareHistogramWith

Declaration

function CompareHistogramWith(SecondImage: TIEBitmap; Mode: TIECmpMode; GrayScale: Boolean): Double;

Description

Compare histograms of the current image with another image and return a floating point value.
For iecmpRMSE the result will be in the range 0 to 1 indicating the percentage of equality. Otherwise it will be a distance or covariance value.

Note: If the image PixelFormat is not ie24RGB, it will be converted

Parameter	Description
SecondImage	Another image to compare with
Mode	The algorithm used for comparison
GrayScale	If True, only a gray scale histogram is compared

Demos

	Demos\ImageAnalysis\ImagesDiff\ImagesDiff.dpr
	Demos\ImageEditing\EveryMethod\EveryMethod.dpr

Example

rmse := ImageEnView1.Proc.CompareHistogramWith( ImageEnView2.IEBitmap, iecmpRMSE, chkChwGray.Checked );
hamm := ImageEnView1.Proc.CompareHistogramWith( ImageEnView2.IEBitmap, iecmpHamming, chkChwGray.Checked );
cova := ImageEnView1.Proc.CompareHistogramWith( ImageEnView2.IEBitmap, iecmpCovariance, chkChwGray.Checked );

lblRmse2.Caption := IEFloatToFormatString( rmse, 2, True );
lblHamming.Caption := IEFloatToFormatString( hamm, 2, True );
lblCovariance.Caption := IEFloatToFormatString( cova, 2, True );

Example Images

Result: GrayScale = False
Root mean squared error: 0.93
Hamming distance: 0.02
Covariance: -31,047.26

Result: GrayScale = True
Root mean squared error: 0.92
Hamming distance: 0.019
Covariance: -21,072.6

TImageEnProc.CompareHistogramWith