how to find the height of a signature
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From: Roshan Rajaratnam on 14 May 2010 08:27 "Sean " <sean.dewolski(a)nospamplease.umit.maine.edu> wrote in message <hsjeqe$pt7$1(a)fred.mathworks.com>... > "Roshan Rajaratnam" <rajaratnam_roshan(a)yahoo.com> wrote in message > > > > so what about the threshold value for all types of signatures? please help me im really in need of this > > thanx > > > Between 9 and pi^2. what do you mean sean?
From: Roshan Rajaratnam on 14 May 2010 08:27 "Sean " <sean.dewolski(a)nospamplease.umit.maine.edu> wrote in message <hsjeqe$pt7$1(a)fred.mathworks.com>... > "Roshan Rajaratnam" <rajaratnam_roshan(a)yahoo.com> wrote in message > > > > so what about the threshold value for all types of signatures? please help me im really in need of this > > thanx > > > Between 9 and pi^2. what do you mean sean?
From: Sean on 14 May 2010 08:43 "Roshan Rajaratnam" <rajaratnam_roshan(a)yahoo.com> wrote in message <hsjfio$f9g$1(a)fred.mathworks.com>... > "Sean " <sean.dewolski(a)nospamplease.umit.maine.edu> wrote in message <hsjeqe$pt7$1(a)fred.mathworks.com>... > > "Roshan Rajaratnam" <rajaratnam_roshan(a)yahoo.com> wrote in message > > > > > > so what about the threshold value for all types of signatures? please help me im really in need of this > > > thanx > > > > > > Between 9 and pi^2. > > what do you mean sean? The amount of information you've given us is very ambiguous so the answer you got was equally ambiguous. How are we to know what types of signatures there are, and what the specific ones you have look like? A simple method to try: >>imtool(signature_image); Then click on the black and white circle; adjust the sliders and see what happens.
From: ImageAnalyst on 14 May 2010 08:49 On May 14, 8:05 am, "Roshan Rajaratnam" <rajaratnam_ros...(a)yahoo.com> wrote: > ImageAnalyst <imageanal...(a)mailinator.com> wrote in message <30632f96-6364-479f-9891-0b17dd463...(a)d27g2000yqc.googlegroups.com>... > > Why don't you just try some and see how it goes? Or read the image > > into some software that has a more interactive thresholding method, > > like Photoshop? > > so what about the threshold value for all types of signatures? please help me im really in need of this > thanx ------------------------------------------------------------------------------------------------------------------------- Why don't you just try some and see how it goes? Or read the image into some software that has a more interactive thresholding method, like Photoshop or ImageJ? For example, try 1170 and see if that works. Or try a non-interactive method like MATLAB's graythresh(). I mean, how crucial is it that you have EXACTLY the top and bottom rows anyway? Is it such a tradgedy if you're off by a line or two? You can use a fixed threshold if you have good control over your lighting situation, otherwise you'll have to use an adaptive one, either a global one like Otsu's method implemented in graythresh(), or process the image with adapthisteq() to get the image into a form where you CAN use a global threshold.
From: Steven Lord on 14 May 2010 10:02
"Roshan Rajaratnam" <rajaratnam_roshan(a)yahoo.com> wrote in message news:hsjea0$n9e$1(a)fred.mathworks.com... > ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message > <30632f96-6364-479f-9891-0b17dd4632b9(a)d27g2000yqc.googlegroups.com>... >> Why don't you just try some and see how it goes? Or read the image >> into some software that has a more interactive thresholding method, >> like Photoshop? > > so what about the threshold value for all types of signatures? please help > me im really in need of this thanx That question doesn't have an answer. What if I sign my name on a black sheet of paper using a black ink pen? That scenario will have a different threshold for distinguishing the signature (in black ink) from the background (a black sheet of paper) than if I signed my name on a white sheet of paper using a black ink pen. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ |