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CImage:PixGE
The PixGE method returns the coordinates of the first pixel with value greater than or equal to a target value.
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x, y = CImage:PixGE( CRect, value ) |
The region is
specified by a CRect.
having 1-based coordinates.
value is the target value, specified by a number or
string.
x,y are the returned pixel coordinates of the
pixel.
On success,
this method returns x,y,true.
On failure,
0,0,false is returned.
Using a rectangle to limit its search, this method locates the first pixel with value at or above a threshold. The search is performed in a row-wise fashion, examining each pixel value along a row before advancing to the next row. The first pixel meeting the criterion stops the search. The related PixGELE method finds a pixel value above or below two thresholds.
The following script fragment opens an image from the file at sPath, then searches for the first pixel with value>=1000. The search is limited to columns 100:200 and rows 250:350:
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I = CImage:new() |
-- Create a CImage |
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I:Open( sPath ) |
-- Open the image from sPath. |
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R = CRect:new() |
-- create a rectangle |
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R:Set(100,200,250,350) |
-- columns 100:200, rows 250:350 |
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x, y, bOK = I:PixGE(R,1000) |
-- Find the first pixel value >= 1000 |
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I:delete() |
-- delete the CImage from memory |
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R:delete() |
-- delete the CRect from memory |