17 Replies Latest reply: Sep 15, 2010 6:03 AM by MikeArmstrong RSS

    Digitize Trace

    ptc-1368288 Copper
      Adapted from Valery ... July 01, 2009

      jmG
        • Re: Digitize Trace
          MikeArmstrong Diamond

          Jean,

           

          I have just fell across this useful function.

           

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

           

          Mike

            • Re: Digitize Trace
              ValeryOchkov PTC Community Champion

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

              Pallete Matrix + Button Picture

              • Re: Digitize Trace
                Platinum

                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

                  • Re: Digitize Trace
                    MikeArmstrong Diamond
                    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

                      • Re: Digitize Trace
                        Platinum

                        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

                          • Re: Digitize Trace
                            MikeArmstrong Diamond

                            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

                              • Re: Digitize Trace
                                superres Silver

                                Just went through that this morning.

                                 

                                > binarized

                                > edit in paint to remove interferences in the graph

                                > select the region to digitize

                                 

                                TTFN

                                  • Re: Digitize Trace
                                    MikeArmstrong Diamond

                                    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

                                      • Re: Digitize Trace
                                        superres Silver

                                        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

                                    • Re: Digitize Trace
                                      Platinum

                                      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