error in image capture

iam getting this error always,i dont know what this error means and how to fix it?

error: Undefined function or variable 'CAMERA'.

Error in bodekkealgo>automate (line 38)

img = im2double(getsnapshot(CAMERA)); %captures images

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()
    pause(10)
end



plot(value);                     %plotting values just for our visual understanding
[m,index] = max(value)
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()
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);
    value(k) = bodekke(F);        %bodekke function call                                                                                
end
end

Answer 1

[Walter Roberson]

function automate()

need to be

function automate(CAMERA)

and your line

automate()

Needs to be

automate(CAMERA)

[barath V]

hi it worked thanks,but iam having another problem now.

error: Error using imaqdevice/getsnapshot (line 65)

A timeout occurred during GETSNAPSHOT.

Error in bodekkealgo>automate (line 37)

img = im2double(getsnapshot(CAMERA)); %captures images