CImage:PixGE

CImage:PixGE

The PixGE method returns the coordinates of the first pixel with value greater than or equal to a target value.

Syntax

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.

Remarks

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.

Example

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:

I = CImage:new()	-- Create a CImage
I:Open( sPath )	-- Open the image from sPath.
R = CRect:new()	-- create a rectangle
R:Set(100,200,250,350)	-- columns 100:200, rows 250:350
x, y, bOK = I:PixGE(R,1000)	-- Find the first pixel value >= 1000
I:delete()	-- delete the CImage from memory
R:delete()	-- delete the CRect from memory