MATLAB: How to update the variable of a function using a dialogbox

cpcorrdigital image processingImage Acquisition Toolboximage analysisimage processingImage Processing ToolboxMATLAB

INTRO: I use the script below to track the shift of a pixel between two images:
clear all; close all;
prompt          =   {'CORRELATION SIZE:'};
dlg_title       =   'SHIFTED PIXEL';
def             =   {'5'};
answer          =   inputdlg(prompt,dlg_title,[1 20],def);
CORRSIZE        =   str2num(answer{1,1}); %#ok<ST2NM>
base_points_0   =   [56  37];
input_points_0  =   [56  37];
imagea          =   imread('1.bmp');
imageb          =   imread('2.bmp');
image1          =   rgb2gray(imagea);
image2          =   rgb2gray(imageb);
d               =   zeros(1,2,2);
d(:,:,1)        =   base_points_0;
[input_points, base_points] = cpselect(image2,image1, input_points_0, base_points_0,'Wait', true);
updated_inputs  =   cpcorr(input_points, base_points, image2, image1);
d(:,:,2)        =   updated_inputs;
The shift of a pixel between two images is correct if the variable CORRSIZE found in line 76 of cpcorr.m is chosen properly. Therefore, I begin the script with a dialo-gbox to allow to chose the CORRSIZE before the script runs.
PROBLEM: CORRSIZE is updated only in the workspace but not in the function cpcorr.m and consequently I always have to open cpcorr.m from the command line, go to line 76 and change it manually.
I wonder if someone could write me how could I update CPCORR from a dialog-box incorporated in the current script and thus avoid to open cpcorr.m and do all steps manually.
I thank you in advance for your help Emerson

Best Answer

Try the (while) loop with simple criterion, as:
    clear all; close all;
    prompt          =   {'CORRELATION SIZE:'};
    dlg_title       =   'SHIFTED PIXEL';
    def             =   {'5'};
    CORRSIZE        =   5; % Here. Or any initial value, see below why
    while (CORRSIZE); % Here.
    answer          =   inputdlg(prompt,dlg_title,[1 20],def);
    CORRSIZE        =   str2num(answer{1,1}); %#ok<ST2NM>
    if CORRSIZE==0; % Here. When you input ZERO it will stop.
        break % Here
    end % Here. To end the endless loop
    base_points_0   =   [56  37];
    input_points_0  =   [56  37];
    imagea          =   imread('1.bmp');
    imageb          =   imread('2.bmp');
    image1          =   rgb2gray(imagea);
    image2          =   rgb2gray(imageb);
    d               =   zeros(1,2,2);
    d(:,:,1)        =   base_points_0;
    [input_points, base_points] = cpselect(image2,image1, input_points_0, base_points_0,'Wait', true);
    updated_inputs  =   cpcorr(input_points, base_points, image2, image1);
    d(:,:,2)        =   updated_inputs;
    end % Here. End of while loop
Please notice that I added the lines ending with ( %Here ). Perhaps it works now as required.
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