Digitizing data points from am image file. Create (x,y) pairs
INPUT IMAGE
github (image to digitize)
https://tinyurl.com/y9uljjyg
https://github.com/rogerjdeangelis/utl_digitize_data_from_image/blob/master/utl_dotplt.png
also
https://www.dropbox.com/s/7lh0lzyewyg6o2l/utl_dotplt1.png?dl=0
github
https://github.com/rogerjdeangelis/utl_digitize_data_from_image
StackOverlow
https://goo.gl/jrhekz
http://lukemiller.org/index.php/2011/06/digitizing-data-from-old-plots-using-digitize/
see
https://tinyurl.com/y923dgeq
https://stackoverflow.com/questions/50999818/python-how-to-extract-values-at-particular-points-on-graph
INPUT
=====
d:/png/dotplt.png
PNG Image (note one ob hidden)
HEIGHT To digitize this plot and obtain (x,y) values
|
|
75 Y2
|
| *
|
70 +
| *
| *
| *
65 + * *
| * *
| * * *
|
60 + *
| *
| *
| * *
55 +
|
|
| *
50 Y1
|
-X1----------+----------+----------+----------X2
50 75 100 125 150
WEIGHT
EXAMPLE OUTPUT
| FROM IMAGE
NAME weight height | plot_height plot_weight
----------------------------|--------------------------
Alfred 112.5 69 | 69.5 111.7
Alice 84 56.5 | 57.0 84.2
Barbara 98 65.3 | 65.2 98.2
Carol 102.5 62.8 | 63.4 101.9
Henry 102.5 63.5 | 63.4 101.9
...
PROCESS
=======
R Paste this into R console (cannot run as macro inside the old text editor)
library(digitize)
tmp<-"d:/png/utl_dotplt.png"
res<-digitize(tmp)
This will ask you to click on locations on the image
Steps to digitize points or key locations on a image
Pause slightly between point and click
1. Open a dos command window
2. Type R to bring up R
3. Copy and paste teh code below
library(digitize)
tmp<-"d:/png/utl_dotplt.png"
res<-digitize(tmp)
4. Crossairs will appear on the image
click on X1 in the plot (lower left)
wait a couple of seconds (1001 1002)
click on X2
wait a couple of seconds (1001 1002)
click on Y1
wait a couple of seconds (1001 1002)
click on Y2
5. Go to dos command window answer questions
Type x1 '40' <enter>
Type x2 '160' <enter>
Type Y1 '50' <enter>
Type Y2 '75' <enter>
6. Crosshairs will appear on plot
click on the points (no wait?)
7. Right click
click on stop (stop appears in the upp right banner)
8. type 'res' (this will list the x,y points)
9. save(res,file="d:/rda/res.rda")
Return to SAS and run the solution below
%utl_submit_wps64('
options set=R_HOME "C:/Program Files/R/R-3.3.2";
libname wrk "%sysfunc(pathname(work))";
proc r;
submit;
source("C:/Program Files/R/R-3.3.2/etc/Rprofile.site", echo=T);
load("d:/rda/res.rda");
res;
endsubmit;
import r=res data=wrk.reswps;
run;quit;
');
OUTPUT
======
WORK.WANT
FROM IMAGE FROM IMAGE
NAME weight plot_weight height plot_height
------------------------------------------------------
Alfred 112.5 111.7 69 69.5
Alice 84 84.2 56.5 57.0
Barbara 98 98.2 65.3 65.2
Carol 102.5 101.9 62.8 63.4
Henry 102.5 101.9 63.5 63.4
James 83 84.2 57.3 57.4
Jane 84.5 84.2 59.8 60.2
Janet 112.5 112.0 62.5 63.1
Jeffrey 84 84.2 62.5 63.1
John 99.5 100.2 59 59.6
Joyce 50.5 50.2 51.3 51.7
Judy 90 90.2 64.3 64.4
Louise 77 78.4 56.3 56.6
Mary 112 112.0 66.5 66.5
Philip 150 149.8 72 72.3
Robert 128 128.0 64.8 65.2
Ronald 133 133.8 67 67.3
Thomas 85 84.8 57.5 57.3
William 112 112.0 66.5 66.5
* _ _
_ __ ___ __ _| | _____ (_)_ __ ___ __ _ __ _ ___
| '_ ` _ \ / _` | |/ / _ \ | | '_ ` _ \ / _` |/ _` |/ _ \
| | | | | | (_| | < __/ | | | | | | | (_| | (_| | __/
|_| |_| |_|\__,_|_|\_\___| |_|_| |_| |_|\__,_|\__, |\___|
|___/
;
options ls=72 ps=48;
%utlfkil(d:/txt/utl_dotplt.txt);
%utlfkil(d:/png/utl_dotplt.cgm);
filename dow 'd:/txt/utl_dotplt.txt';
proc printto print=dow new;
run;
proc plot data=sashelp.class(keep=name height weight);
plot height*weight='*';
run;quit;
proc printto;
run;
filename dow clear;
* EDIT THE LINE PRINTER PLOT IF YOU WANT TO ELIMINATE HEADERS AND FOOTERS
NOT NEEDED;
filename dow 'd:/txt/utl_dotplt.txt';
goptions reset=all border gaccess=gsasfile
ftext='MingLiU' htext=1.35 device=png;
filename gsasfile "d:/png/utl_dotplt.png";
proc gprint fileref=dow;
run;
quit;
filename gsasfile clear;
filename dow clear;
* _ _ _
___ ___ | |_ _| |_(_) ___ _ __
/ __|/ _ \| | | | | __| |/ _ \| '_ \
\__ \ (_) | | |_| | |_| | (_) | | | |
|___/\___/|_|\__,_|\__|_|\___/|_| |_|
;
library(digitize)
tmp<-"d:/png/utl_dotplt.png"
res<-digitize(tmp)
* interactive oint selection;
%utl_submit_wps64('
options set=R_HOME "C:/Program Files/R/R-3.3.2";
libname wrk "%sysfunc(pathname(work))";
proc r;
submit;
source("C:/Program Files/R/R-3.3.2/etc/Rprofile.site", echo=T);
load("d:/rda/res.rda");
res;
endsubmit;
import r=res data=wrk.reswps;
run;quit;
');
* check;
proc sql;
select
l.name
,mean(l.weight) as weight
,mean(r.x) as plot_weight format=5.1
,mean(l.height) as height
,mean(r.y) as plot_height format 5.1
from
sashelp.class as l left join reswps as r
on
(abs(weight-x) + abs(height-y)) < 1.8
group
by name
order
by name
;quit;
WANT (Plot_* is digitized data)
===============================
FROM IMAGE FROM IMAGE
NAME weight plot_weight height plot_height
------------------------------------------------------
Alfred 112.5 111.7 69 69.5
Alice 84 84.2 56.5 57.0
Barbara 98 98.2 65.3 65.2
Carol 102.5 101.9 62.8 63.4
Henry 102.5 101.9 63.5 63.4
James 83 84.2 57.3 57.4
Jane 84.5 84.2 59.8 60.2
Janet 112.5 112.0 62.5 63.1
Jeffrey 84 84.2 62.5 63.1
John 99.5 100.2 59 59.6
Joyce 50.5 50.2 51.3 51.7
Judy 90 90.2 64.3 64.4
Louise 77 78.4 56.3 56.6
Mary 112 112.0 66.5 66.5
Philip 150 149.8 72 72.3
Robert 128 128.0 64.8 65.2
Ronald 133 133.8 67 67.3
Thomas 85 84.8 57.5 57.3
William 112 112.0 66.5 66.5
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