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Histogram thresholding is a technique used to separate objects from the background, it is not always possible to do this, especially if the background has similar colours or grey scale as the objects,

this example made dark pixels black and light pixals white:

;threshold image

thresMin=243

thresMax=242

for j=0,293 do begin

for k=0,220 do begin

temp=hardware(j,k)

if temp lt thresMin then temp=0;black

if (temp gt thresMax) then temp=255;white

hardwareThreshold(j,k)=temp

endfor

endfor

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