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4302 Views 17 Replies Latest reply: Sep 15, 2010 6:03 AM by MikeArmstrong RSS
ptc-1368288 Copper 15,155 posts since
Nov 15, 2007
Currently Being Moderated

Jul 4, 2009 12:00 AM

Digitize Trace

Adapted from Valery ... July 01, 2009

jmG
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  • MikeArmstrong Diamond 4,435 posts since
    Dec 3, 2008
    Currently Being Moderated
    Sep 14, 2010 4:18 AM (in response to ptc-1368288)
    Re: Digitize Trace

    Jean,

     

    I have just fell across this useful function.

     

    Can you explain how this works and how the Matrix "M" is generated.

     

    Mike

    • ValeryOchkov Platinum 6,121 posts since
      Sep 26, 2008
      Currently Being Moderated
      Sep 14, 2010 5:52 AM (in response to MikeArmstrong)
      Re: Digitize Trace

      >Can you explain how this works and how the Matrix "M" is generated.

      Pallete Matrix + Button Picture

    • Platinum 622 posts since
      Jun 22, 2010
      Currently Being Moderated
      Sep 14, 2010 10:24 AM (in response to MikeArmstrong)
      Re: Digitize Trace

      MIke Armstrong wrote:

       

      Jean,

       

      I have just fell across this useful function.

       

      Can you explain how this works and how the Matrix "M" is generated.

       

      Mike

      Mike,

       

      The matrix M is created from the "Matrix clipboard operation". An essential procedure in image processing. If you don't have the twist, please let me know. There are several tools to digitize  a graph. I use "Tracer" from Markus Karolweski,  there is also the "Mathsoft Digitize". For very difficult cases, I use my own. In most applications, it is necessary to clean in Paint. The quality of digitizing depends upon the quality of the image. Too much distortion  ==> recycle bin.

       

      Jean

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      • MikeArmstrong Diamond 4,435 posts since
        Dec 3, 2008
        Currently Being Moderated
        Sep 14, 2010 11:23 AM (in response to jeanGiraud)
        Re: Digitize Trace
        Mike,

         

        The matrix M is created from the "Matrix clipboard operation". An essential procedure in image processing. If you don't have the twist, please let me know. There are several tools to digitize  a graph. I use "Tracer" from Markus Karolweski,  there is also the "Mathsoft Digitize". For very difficult cases, I use my own. In most applications, it is necessary to clean in Paint. The quality of digitizing depends upon the quality of the image. Too much distortion  ==> recycle bin.

         

        Jean

        Thanks Jean,

         

        I have just downloaded a copy of Tracer from a link from yourself from a previous thread.

         

        Have you extrapolated the points using Tracer?

         

        Mike

        • Platinum 622 posts since
          Jun 22, 2010
          Currently Being Moderated
          Sep 14, 2010 11:47 AM (in response to MikeArmstrong)
          Re: Digitize Trace

          Thanks Jean,

           

          I have just downloaded a copy of Tracer from a link from yourself from a previous thread.

           

          Have you extrapolated the points using Tracer?

           

          Mike

          _________________________

           

          Sorry Mike, I don't understand "extrapolate" in term of digitize ?

           

          Jean

          • MikeArmstrong Diamond 4,435 posts since
            Dec 3, 2008
            Currently Being Moderated
            Sep 14, 2010 11:52 AM (in response to jeanGiraud)
            Re: Digitize Trace

            Jean,

             

            You managed to clean the graph and show the top section of the curve. I thought you had extrapolated to get those values - my mistake sorry.

             

            Have you any tips on how to use the tracer software - Do you remove the grid lines using paint or tracer?

             

            Mike

            • superres Silver 7,759 posts since
              Jun 1, 2007
              Currently Being Moderated
              Sep 14, 2010 12:54 PM (in response to MikeArmstrong)
              Re: Digitize Trace

              Just went through that this morning.

               

              > binarized

              > edit in paint to remove interferences in the graph

              > select the region to digitize

               

              TTFN

              • MikeArmstrong Diamond 4,435 posts since
                Dec 3, 2008
                Currently Being Moderated
                Sep 14, 2010 12:58 PM (in response to superres)
                Re: Digitize Trace

                Eden Mei wrote:

                 

                Just went through that this morning.

                 

                > binarized

                > edit in paint to remove interferences in the graph

                > select the region to digitize

                 

                TTFN

                Eden,

                 

                What does binarized mean?

                 

                So the curve gets selected and passed to the digitizing software?

                 

                It seems that the trace software can take the image or the extract the numerical data to Excel.

                 

                Mike

                • superres Silver 7,759 posts since
                  Jun 1, 2007
                  Currently Being Moderated
                  Sep 14, 2010 1:20 PM (in response to MikeArmstrong)
                  Re: Digitize Trace

                  Some of the curves I get are jpegs, which may have pretty ratty contrast to the background, so I generally try to grayscale the graph, and if its contrast is OK, I convert to a two-value color format, and then convert back, but I'm not sure whether Tracer will do two-value.

                   

                  In any case, you get a graph with only black or white values.  Then, in Paint, I eliminate most of the graph borders, leaving just enough to digitize the corners of the graph for proper scaling of the data.   Then, you just drag/select the region to be digitized, and hit "Automatic" and it does its thing.

                   

                  I only use Trace about once every 3 or 4 yrs, so it's always a learning experience when I use it, but I'm usually pressed for time, as well.  There's probably better ways to do, but I'm loathe to try and figure them out, since I'll probably have forgotten them the next time I use the program.

                   

                  TTFN

            • Platinum 622 posts since
              Jun 22, 2010
              Currently Being Moderated
              Sep 14, 2010 9:30 PM (in response to MikeArmstrong)
              Re: Digitize Trace

              MIke Armstrong wrote:

               

              Jean,

               

              You managed to clean the graph and show the top section of the curve. I thought you had extrapolated to get those values - my mistake sorry.

               

              Have you any tips on how to use the tracer software - Do you remove the grid lines using paint or tracer?

               

              Mike

              How I digitize :

              1. sufficiently clean graph ==> Valery

              2. zoned image-graph ==> Mathsoft digitizer

              3. more ambiguous graphs ==> Tracer

              4. RGB, Gray and any unfeasible graph ==> Hyper-Digitize [jmG]

              5. specific value or "range value" ==> Mathcad EXTRACT(,,,) ... extract(,,,)

               

              The Hyper-Digitize is manual only, works on the "mouse numeric pad".

              APPEND  to file. For images, a great lot of images processing can be

              applied to help extract. Nothing special about using Tracer. Some web plot

              have grid lines in gray, then no need to remove the lines. Generally, wise

              to remove lines for the Mathsoft digitizer. Just too bad the "Hyper-Digitize"

              can't be automated . The matter would be to code the "mouse-left-click".

              That was suggested but ignored !

               

              Cheers Mike, enjoy.

               

              Jean

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