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Content-Type: text/plain; charset="us-ascii" Message-ID: <v04011702b6a5ef1619fb@[137.187.230.154]> Date: Tue, 6 Feb 2001 10:18:29 -0800 Reply-To: ImageJ Interest Group <[log in to unmask]> Sender: ImageJ Interest Group <[log in to unmask]> From: Wayne Rasband <[log in to unmask]> Subject: Re: CenterOfMass error when minThreshold==0 In-Reply-To: <002f01c08f88$98411460$02000003@signup>>Wayne, >This may be a moot point but >when minThreshold==0 and a thresholded particle contains zero value pixels, >measure will return a (0,0) CenterOfMass. >This is particularly a problem when using CofM for tracking or >otherwise drawing lines to join particle CofM's. >Properly thresholded zero-pixel-valued particles will appear at origin >causing erratic lines. I added Greg's fix to v1.21o and it seems to work. The Center of Mass of all zero selections is now the same as the centroid. -wayne
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