LocateWhiteDot.py

gistfile1.py

(c) 2010 Narendra Sisodiya, http://narendrasisodiya.com , released under MIT license

def LocateWhiteDot(image):
	width,height=image.size 
	### Scan Column
	xStart = 0
	weHaveXStart = 0
	xEnd = 0
	for i in range(0,width):
		blank = 0
		for j in range(0,height):
			#Now Scanning i-th Column... (Column number, Row number)
			blank = blank + image.getpixel((i,j))
	
		if blank != 0 :
			if weHaveXStart == 1:
				xEnd = i
			else:
				xStart = i
				weHaveXStart = 1

	### Scan rows
	RowNum = []
	yStart = 0
	weHaveYStart = 0
	yEnd = 0

	for j in range(0,height):
		blank = 0
		for i in range(0,width):
			#Now Scanning j-th Row... (Column number, Row number)
			blank = blank + image.getpixel((i,j)) 
	
		if blank != 0 :
			if weHaveYStart == 1:
				yEnd = j
			else:
				yStart = j
				weHaveYStart = 1

	xMid = (xStart + xEnd)/2
	yMid = (yStart + yEnd)/2

	return (xMid,yMid)