ReversePlot

To create a new plot from a scanned image file

Description

This function opens an image file containing a plot. Then the origin, maximum X and Y axis, and data points can be manually and automatically selected to obtain a new vectorial plot (the animated screenshot shows the menus included).

Using Image Processing Toolbox to open idexed and gray images (functions ind2rgb, gray2rgb).

More functions at http://robotica.udl.cat

• Required Products: Image Processing Toolbox
• MATLAB release: MATLAB 6.5 (R13)

[Alberto Zin]

Really useful !

[R J]

This is super handy

[Dick Beresford]

A very neat bit of code that provides a useful function. Deals with log as well as linear axes. Would be even more useful if it could return the coordinates as data values in the MATLAB workspace.

[sono fera]

I wonder if it's could work on a plot-with-marker like seismic plot.

[dewi]

Really useful for me.....

[Enrico]

Coooooool. I've found a basic bug, though. In function loaddata, lines 98-100,
        info = imfinfo([lower(pathname) lower(filename)]);
        [a,map] = imread([lower(pathname) lower(filename)]);
is plainly wrong on a case-sensitive OS like unix, and files with uppercase pathnames won't load. Removing all lower() solves the problem.

[Enrico]

I see no reason why png should not be supported. To that extent, it is sufficient to change lines 84-90 with:

[filename, pathname] = uigetfile( ...
       {'*.jpg;*.jpeg;*.gif;*.bmp;*.tif;*.png','All suported formats'
        '*.jpg;*.jpeg','JPEG (*.jpg;*.jpeg)'; ...
        '*.gif','Gif (*.gif)'; '*.png','PNG (*.png)'; ...
        '*.bmp','Bitmap (*.bmp)'; ...
        '*.tif','TIFF (*.tif)'}, ...
         'Open scanned image...');

[Enrico]

Comparing with GRABIT
(http://www.mathworks.co.uk/matlabcentral/fileexchange/7173-grabit):

-Zooming the figure is not possible in reverseplot;
-reverseplot doesn't mark the datapoints manually pointed at, while marking them one by one, only at the end;
-reverseplot does not offer to delete the last point erroneously pointed (could e.g. be bound to Backspace)

-GRABIT misses the automatic curve detection;

Besides, I just realized that in reverseplot "Delete an area of the curve..." has a bug (the selection rectangle is misplaced)

Anyway, both pieces of software are nice and useful.

[Enrico]

Bug "Delete an area of the curve...:
I think all is needed to correct it is to change line 420 with
rbbox %(no arguments)

[David Abraham]

Just tried it out and it works simply and well. I like software that doesn't require any reading of manuals, and the results are great. Thanks!