imwrite

hi i have two porblem please help me 1- why varible B of the previouse function not known for the next function ?? 2 -what code is required for the save image with written informatin (time by text) ?

function Recogtion_Callback(hObject, eventdata, handles)
% % % % % % 
cla(handles.axes3)
[B,f]=uigetfile('*.jpg;*.tif;*.png;*.gif');
ff=[f B];
axes(handles.axes3);
imshow(ff); 
guidata(hObject, handles);
tm=datestr(now,'yyyy/mm/dd         HH:MM:SS');
text(15,20,tm,'color','r','fontsize',16)

function Save_Callback(hObject, eventdata, handles)
tm=datestr(now,'yyyymmddTHHMMSS');
n=strcat('d:\',tm,'.jpg');
imwrite (B,n); 
guidata(hObject, handles);

[EDITED, code formatted, Jan]

Answer 1

[Jan]

Do you assume that B is known inside the function SaveCallback? If so, this assumption is wrong. The visibility of variables is limited to their functions. This is explained in the Getting Started chapters of the documentation.

What does "save image with written information" exactly mean? Do you want to add a comment? Then reading "help imwrite" and "doc imwrite" will provide the necessary arguments.

[Image Analyst]

Or maybe export_fig() if he wrote some text into the overlay with the text() function.

[mostafa]

no

is there a function that image with print information on image to save by text function ???

[Walter Roberson]

The mechanism for that is to text() onto the image, and then getsnap() and imwrite() that result.

[Image Analyst]

You can use imtext() in the Computer Vision Toolbox, or try this File Exchange submission: http://www.mathworks.com/matlabcentral/fileexchange/31187-label-image