4.8 | 28 ratings Rate this file 174 downloads (last 30 days) File Size: 23.43 KB File ID: #7173

GRABIT

17 Mar 2005 (Updated 23 Jan 2007)

Extract (pick out) data points off image files.

File Information
Description	GRABIT Extracts data points from an image file. GRABIT starts a GUI program for extracting data from an image file. It is capable of reading in BMP, JPG, TIF, GIF, and PNG files (anything that is readable by IMREAD). Multiple data sets can be extracted from a single image file, and the data is saved as an n-by-2 matrix variable in the workspace. It can also be renamed and saved as a MAT file. Following steps should be taken: 1. Load the image file. 2. Calibrate axes dimensions. You will be prompted to select 4 points on the image. 3. Grab points by clicking on points. Right-click to delete a point. Image can be zoomed during this stage. 4. Multiple data sets will remain in memory so long as the GUI is open. Variables can be renamed, saved to file, or edited in Array Editor. Panning is achieved by clicking and dragging on the image. In addition to using the zoom button, there are keyboard shortcuts for zooming: <shift> - center view <a> - zoom in <b> - zoom out <space> - reset view This code will also work for extracting data points from a tilted or a skewed image (even upside-down or mirrored). The calibration stage ensures that the imperfect orientation or quality of the image is accounted for. The types of files that will most likely work are BMP, JPG, TIF, GIF (up to 8-bit), and PNG files. Basically, any format supported by the IMREAD is accepted. GRABIT(FILENAME) will start the GUI program and open the image file FILENAME. Type GRABIT('-sample') to load a sample image. Created in MATLAB R13. Tested up to R2006a
Acknowledgements	This submission has inspired the following: SMIProm, INTERACTIVEMOUSE
MATLAB release	MATLAB 6.5 (R13)
Other requirements	Tested up to R2006b

Tags for This File
Everyone's Tags	data, data exploration, data mining, extract, grab, image, scan
Tags I've Applied
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Comments and Ratings (33)
11 May 2005	Chen-Fen Huang
02 Jun 2005	radha proddaturi	perfect... would suggest to improve on finding data automatically when clicked on any particular line on the image
02 Aug 2005	Siva Venkat	good piece of code. useful for retrieving data points from images.
18 Aug 2005	Dewa Arsa	A very good code. I have tried it, it works well.
22 Dec 2005	Tony Jones	The imshow command used at line 382 ('iH = imshow(A, map)') does not work in MATLAB R14 SP2. Replacing it with 'iH = image(A); colormap(map);' solves the problem. Other than that a very useful but of code!
23 Dec 2005	Jiro Doke	Tony, Thanks for the comment. I think the problem might be that you don't have Image Processing Toolbox. But nice suggestions, I'll update it with IMAGE command to be more compatible. It should be up in the next update. In the meantime, you can download the newest version from here: http://www-personal.umich.edu/~jdokeh/my_mfiles.html
13 Feb 2006	Leo Medo	Sorry, but wenn I start your code, I can see only GUI. If I browse a filename (Load Image) - only a path and image name will be shown, but I can´t see anything... Please inform me what to do, thanks
27 Feb 2006	Dick Beresford	A very useful utility. Suggested additions and improvements are: 1) facility to deal with logarithmic as well as linear axes. 2) allow zoom function to work in calibration mode as well as in data grabbing mode so that axis limits can be defined more accurately.
02 Mar 2006	Jiro Doke	I have uploaded an improved version. It has a better zooming feature (also zoomable during calibration) and a click-n-drag panning feature. I have not yet implemented capability to deal with LOGARITHMIC axes, but that's on my to-do list.
30 Mar 2006	iman satria
30 Mar 2006	John Terry	excellence! I am waiting for the next version which can deal with logarithmic axis. Good luck!
02 May 2006	Seis Errs	very useful tool. Thanks a lot.
03 Aug 2006	Nick Peters	Excellent tool. Thanks for posting.
10 Nov 2006	Lars Sundstrom	Extremely useful. Thank you very much for sharing.
18 Nov 2006	Cong Le
12 Jan 2007	Hector Mancha	Very usefull,
07 Feb 2007	Pankaj Porwal	Just loved it. Very good interface also.
09 Feb 2007	Eduard van der Zwan	This is something I was looking for. Thank You. Tip: wouldn't it be nice to extract data point form graphs with logaritmic axes?
21 Feb 2007	Jean-Luc Dellis	Thanks a lot. Good Job.
26 Jun 2007	RAMAR RAMARAJ	for the last six month i am trying to extract the data from the image file. Now i got it. this is very well work for me and all (those who are working Scientific data processing).
06 Sep 2007	Avi Pal	Does not work. from the first line itself it says unexpected matlab operator.. please help. i am using matlab 7.1.0.246 (R14)
06 Sep 2007	Avi Pal	Does not work. from the first line itself it says unexpected matlab operator.. please help. i think its not identifying 3d i am using matlab 7.1.0.246 (R14)
11 Oct 2007	Amandine Cagnioncle	This script is a lot better than Datathief which I formerly used. It makes extracting data from figures easier and faster!
16 Oct 2007	Iomsn Egenson	This program is ingenious. It is extremely small, easy to use and yet so useful that it makes it the ultimate grab tool.
19 Oct 2007	Jhon Gonzalez	GREEEEAT, Is it possible that in the preview box shows the position calibrated and the corresponding pixel? I plan to use it to calibrate a video to follow a laser spot
30 Oct 2007	Lorenzo Luini	This is one of the best and most useful tool I found here: really compliments!
23 Dec 2007	Mikkel Pedersen	Super tool! Need the capability to use log-axes though.
26 Mar 2008	Sigmund As	Excellent tool - best one of these I've used so far. Log axes? No problem, just type in the exponent as the calibration values. Suggestions: * Ask the user if the data should be adjusted if the user recalibrates after grabbing. * If the scan is not perfectly horizontal it would be nice to have two adjustment points for each xmin, xmax, ymin, and ymax - i.e. support for rotated coordinate transformation.
04 Apr 2008	ghgf ghf
26 May 2008	a c	GREAT GREAT GREAT WORK!!!!
23 Feb 2009	Brian	A very useful application.
02 Mar 2009	Donat-Pierre Luigi	This a great application. I would have one request. Would it be possible to calibrate to the image size, with origin at top left max Y at bottom-left and max X at top-right. It is very basic and not as general as the current calibration procedure using 4points. I am having issues with zoom and ginput to get the coordinate of a point in an image to change the coordinate system to that point later on in pixel and physical units. Thanks.
17 Sep 2009	Torsten Vogel

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Updates
21 Mar 2005	Added the functionality to start the GUI and open an image file from the command line. Also embedded a sample image file to the function. Type 'GRABIT -sample'.
21 Mar 2005	Added the functionality to start the GUI and opening an image file from the command line. Also embedded a sample image file into the fuction. Type 'grabit -sample'.
27 Dec 2005	Use IMAGE instead of IMSHOW for compatibility (does not require Image Processing Toolbox).
27 Dec 2005	Use IMAGE instead of IMSHOW for compatibility (does not require Image Processing Toolbox).
27 Dec 2005	Use IMAGE instead of IMSHOW for compatibility (does not require Image Processing Toolbox).
03 Mar 2006	Major code change. Added zoom feature during calibration. Added panning feature.
03 Mar 2006	Bug fix (typo)
13 Mar 2006	Animate view change and zooming for a better visual perception.
23 Mar 2006	Added mouse features: double-click to center view. right-click and drag to zoom. other minor code changes.
23 Mar 2006	Added mouse features: double-click to center view. right-click and drag to zoom. other minor code changes.
04 May 2006	Fixed loadImageFcn bug.
23 Jan 2007	Fixed bug. Now, grayscale images can be loaded.

Tag Activity for this File
Tag	Applied By	Date/Time
data exploration	Jiro Doke	22 Oct 2008 07:43:31
data	Jiro Doke	22 Oct 2008 07:43:31
extract	Jiro Doke	22 Oct 2008 07:43:31
grab	Jiro Doke	22 Oct 2008 07:43:31
image	Jiro Doke	22 Oct 2008 07:43:31
scan	Jiro Doke	22 Oct 2008 07:43:31
data mining	Jiro Doke	22 Oct 2008 07:43:31

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