ImgHistoValue

Prototype

intValue:=ImgHistoValue(intHistoHandle, intLevel)

Description

Retrieve the value of histogram for a specified level.

Parameters

intHistoHandle: integer value corresponding to the histogram handle obtained using ImgHistoCreate.

intLevel: integer value, in range 0 - 255, corresponding to the bin to use

Returned value

Integer value representing the count of pixel into the histogram at specified index.

Notes

In bin [0] is reported the black pixel and in bin [255] white pixel. In grayscale or color image the histogram represent the pixel brightness.

Example

// Show the number of pixels for each gray level

HistoHandle:=ImgHistoCreate(_CurrentImage);

for Level:=0 to 255 do

begin

 PixelCount:=ImgHistoValue(HistoHandle,Level);

 ApplicationLog('The graylevel ' + IntToStr(Level) + ' counts '+ IntToStr(PixelCount)+ ' pixels.');

end;

ImgHistoDelete(HistoHandle);