error:Undefined function or variable 'values'.

Question

barath V 2020-3-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508708-error-undefined-function-or-variable-values

评论： Walter Roberson 2020-3-21

clc;
clear all;
CAMERA = videoinput('pointgrey', '1');%camera initialization
start(CAMERA);
a = serial('COM3','BaudRate',9600);  %arduino initialization
fopen(a);
pause(1);
for a = 1:8
    automate(CAMERA)
    pause(8)
end
plot(values);                     %plotting values just for our visual understanding
[m,index] = max(values)
fprintf(a,'%d',index)            %"here is where we send the position of image to arduino"                                  
fclose(a)
hold on
plot(index,m,'*')
hold off
title("bodekke with spot images")
stop(CAMERA);                      %stop camera acquisition
function[addition] = bodekke(imagename)  %bodekke function mathematics behind the autofocus detection
im = double(imread(imagename))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
end
       
function automate(CAMERA)
for i = 1:30    %to capture images
    
filename = sprintf('testtry%02d.jpg',i);
img = im2double(getsnapshot(CAMERA));  %captures images
img = rgb2gray(img);
imwrite(img,filename)
end
D = 'C:\Users\PRL\Desktop\just';  %location where image  is stored
S = dir(fullfile(D,'*.jpg'));      
for k = 1:numel(S)              %applies bodekke to all images
    F = fullfile(D,S(k).name);
    queen(k) = bodekke(F);        %bodekke function call                                                                                
end
end

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barath V 2020-3-3

在 MATLAB Online 中打开

clc;
clear all;
CAMERA = videoinput('pointgrey', '1');%camera initialization
start(CAMERA);
ard = serial('COM3','BaudRate',9600);  %arduino initialization
fopen(ard);
pause(1);
for b = 1:8
    automate(CAMERA)
    pause(8)
end
fclose(ard)
stop(CAMERA);                      %stop camera acquisition
function[addition] = bodekke(imagename)  %bodekke function mathematics behind the autofocus detection
im = double(imread(imagename))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
end
       
function automate(CAMERA)
for i = 1:30    %to capture images
    
filename = sprintf('testtry%02d.jpg',i);
img = im2double(getsnapshot(CAMERA));  %captures images
img = rgb2gray(img);
imwrite(img,filename)
end
D = 'C:\Users\PRL\Desktop\just';  %location where image  is stored
S = dir(fullfile(D,'*.jpg'));      
for k = 1:numel(S)              %applies bodekke to all images
    F = fullfile(D,S(k).name);
    addition(k) = bodekke(F);        %bodekke function call                                                                                
end
plot(addition);                     %plotting values just for our visual understanding
[m,index] = max(addition)
hold on
plot(index,m,'*')
hold off
title("bodekke with spot images")
fprintf(ard,'%d',index)            %"here is where we send the position of image to arduino"                                  
end

barath V 2020-3-5

在 MATLAB Online 中打开

hi, i defined the object ard inside the function itself,but the close function for ard i have defined outside.

the motors are rotating,the actual execution of the code happens only once,and then i get this com port error and fopen() error.

clc;
clear all;
CAMERA = videoinput('pointgrey', '1');%camera initialization
start(CAMERA);
for b = 1:8
    automate(CAMERA)
    pause(8)
end
fclose(ard)
stop(CAMERA);                      %stop camera acquisition
function[addition] = bodekke(imagename)  %bodekke function mathematics behind the autofocus detection
im = double(imread(imagename))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
end
       
function automate(CAMERA)
ard = serial('COM3','BaudRate',9600);  %arduino initialization
fopen(ard);
pause(1);
for i = 1:30    %to capture images
    
filename = sprintf('testtry%02d.jpg',i);
img = im2double(getsnapshot(CAMERA));  %captures images
img = rgb2gray(img);
imwrite(img,filename)
end
D = 'C:\Users\PRL\Desktop\just';  %location where image  is stored
S = dir(fullfile(D,'*.jpg'));      
for k = 1:numel(S)              %applies bodekke to all images
    F = fullfile(D,S(k).name);
    addition(k) = bodekke(F);        %bodekke function call                                                                                
end
plot(addition);                     %plotting values just for our visual understanding
[m,index] = max(addition)
hold on
plot(index,m,'*')
hold off
title("bodekke with spot images")
fprintf(ard,'%d',index)            %"here is where we send the position of image to arduino"                                  
end

i get this error:Error using serial/fopen (line 72)

Open failed: Port: COM3 is not available. Available ports: COM1.

Use INSTRFIND to determine if other instrument objects are connected to the requested device.

Error in bodekkealgo>automate (line 26)

fopen(ard);

barath V 2020-3-6

在 MATLAB Online 中打开

i used drawnow,but that doesnt solve the issue.

clc;
clear all;
CAMERA = videoinput('pointgrey', '1');%camera initialization
start(CAMERA);
ard = serial('COM3','BaudRate',9600);  %arduino initialization
fopen(ard);
pause(1)
for b = 1:8
    automate(CAMERA,ard)
    pause(8)
end
fclose(ard)
stop(CAMERA);             %stop camera acquisition
function[addition] = bodekke(imagename) %bodekke function mathematics behind the autofocus detection
im = double(imread(imagename))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
end
       
function automate(CAMERA,ard)
for i = 1:30    %to capture images
    
filename = sprintf('testtry%02d.jpg',i);
img = im2double(getsnapshot(CAMERA));  %captures images
img = rgb2gray(img);
imwrite(img,filename)
end
D = 'C:\Users\PRL\Desktop\just';  %location where image  is stored
S = dir(fullfile(D,'*.jpg'));      
for k = 1:numel(S)              %applies bodekke to all images
    F = fullfile(D,S(k).name);
    addition(k) = bodekke(F);        %bodekke function call                                                                                
end
                    
[m,index] = max(addition)
fprintf(ard,'%d',index) %"here is where we send the position of image to arduino"        
plot(addition);    %plotting values just for our visual understanding                        
hold on
plot(index,m,'*')
hold off
title("bodekke with spot images")
drawnow
end

Walter Roberson 2020-3-9

在 MATLAB Online 中打开

For the purpose of debugging, after

title("bodekke with spot images")

add

fprintf('%d of %d elements in addition are finite', nnz(isfinite(addition)), numel(addition));

barath V 2020-3-20

i want to thank mr.walter roberson and matlab people for continuously supporting my projects,thanks mr.walter

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Answer 1

barath V 2020-3-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508708-error-undefined-function-or-variable-values#answer_419192

hi deleting the arduino object solved the pblm,thanlks.

how can i capture a video?

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barath V 2020-3-21

Yes,i capture imagea and analyse it using bodekke,later these images are overwritten. Iam trying to capture a video after i send a value to Arduino,that will be permanent and wont be overwritten or analysed.

Walter Roberson 2020-3-21

在 MATLAB Online 中打开

Use different folders instead of always using

D = 'C:\Users\PRL\Desktop\just';

You could use uigetdir to have the user tell you the directory. Or you could look in the folder and see what subfolders already exist and use the next available one.

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