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 0.0 to 1.0 indicating the percentage of equality. Otherwise it will be a distance or covariance value.

Note: If the PixelFormat of the image is not ie24RGB or ie32RGB, 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

Also see: Automated Samples

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