how can I use a threshold value?

Question

Hello everybody,

I need some help! I have to answer to those questions:

9) Ask
the
user
to
enter
a
thresholding
value
for
the
binary
mask

10)
Given
this
value,
transform
the
image
to
a
binary
image
and
display
the
result
on
the
screen
[useful
tools:
read(),
im2bw()]

11)
Ask
the
user
whether
he/she
is
happy
of
the
result.
Yes
will
be
1
and
No
will
be
0.
Put
1
as
the
default
value.

12)
Modify
these
previous
lines
of
code
with
a
loop
that
only
stops
when
the
user
is
happy
of
the
result.
Basically,
you
can
be
happy
when
the
EHT
is
represented
as
a
rectangle
with
its
two
ends
surrounded
by
black
pixels.
If
the
user
is
not
happy,
ask
him/her
to
enter
a
new
thresholding
value.

I have already found the following code:

  

  *%question 1
    
    select=uigetfile('video.avi');
    
    %question 2
    
    video=mmreader('video.avi');
        
    %question3 
  
  video.NumberOfFrames;
  
  video.Height;
  
  video.Width;
      
  k=video.NumberOfFrames;
      
  for k=100;
         
  mov(1:k)=struct('cdata',[],'colormap',[]);
   
  end;
  
  %question4
  
  %Display the first frame
  
  vidFrame=read(video,k);
  
  %Question 4
  
  %to alert the user that he needs to draw a line on this frame
   
  imshow(vidFrame);
  
  uiwait(msgbox('draw a line on the frame and click on ok to continue', 'Alert')); 
   
  %Question5
  
  pos=wait(imline);
  
  l=length(pos);
  
  %question6
  
  m=sqrt((pos(1,2)-pos(1,1)^2)-((pos(2,2)-pos(2,1)^2)));
  
  question 7
  
  prompt= {'enter the real length in micrometers'};
  
  dlg_title='Enter';
  
  num_lines=1;
  
  def={'1'};
  
  answer=inputdlg(prompt,dlg_title,num_lines,def);
  
  %Question8
  
  % Derive the ration pixel/micrometer
  
  r=1/m;
  
  %Question9
  
  %Ask the user to enter a thresholding value for the binary mask
  
  prompt={'enter a thresholding value - value between 0 and 1'};
  
  dlg_title='Input';
  
  num_lines=1;
  
  def={'0.5'};
  
  answer2=inputdlg(prompt,dlg_title,num_lines,def);
   
  %Question 10
  
  %BW = im2bw(vidFrame,answer2);
  
  %imshow(BW);
  
  %level=answer2;
  
  A = str2num('answer2');%to tranform string answer2 in num answer2
  
  level=input('answer2:');%Request user input
  
  BW = im2bw(vidFrame,level);
  
  imshow(BW);
  
  %Question 11
  
  prompt= {'Are you satisfied? 1 for yes or 0 for no'};
  
  dlg_title='Input';
  
  num_lines=1;
  
  def={'1'};
  
  answer3=inputdlg(prompt,dlg_title,num_lines,def);*

Thank you for your help. I'm very lost!!

YF.

Image Analyst · Accepted Answer

This  snippet may help


  promptMessage = sprintf('Do you want to Continue processing,
or Cancel to abort processing?');
  titleBarCaption = 'Continue?';
  button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue');
  if strcmpi(button, 'Cancel')
  	return; % or break, or continue - whatever you need.
  end

how can I use a threshold value?

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