Undeclared variable in script after assigning to worksapce

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Ankit Singh 2016-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/283192-undeclared-variable-in-script-after-assigning-to-worksapce

关闭： MATLAB Answer Bot 2021-8-20

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function varargout = EyeDistance(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @EyeDistance_OpeningFcn, ...
                   'gui_OutputFcn',  @EyeDistance_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
function EyeDistance_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.video = videoinput('macvideo','FaceTime HD Camera');
set(handles.video, 'ReturnedColorspace', 'RGB');
handles.hImage = image(zeros(720, 1280, 3), 'parent', handles.cameraAxes);
guidata(hObject, handles);
function varargout = EyeDistance_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;
% --- Executes on button press in startCamera.
function startCamera_Callback(hObject, eventdata, handles)
preview(handles.video,handles.hImage);
% --- Executes on button press in captureImage.
function captureImage_Callback(hObject, eventdata, handles)
pause(1);
handles.I = getsnapshot(handles.video);
stop(handles.video);
imshow(handles.I, 'Parent', handles.cameraAxes);
assignin('base','I',handles.I);
% --- Executes on button press in cropFace.
function cropFace_Callback(hObject, eventdata, handles)
DetectFaceandEyes;
imshow(face, 'Parent', handles.cameraAxes);

----------DetectFaceandEyes.M----------

NotYet = false;
%C = webcamlist;
%cam=webcam('macvideo','FaceTime HD Camera');
%preview(cam);
while ~NotYet
    %tic;pause(0.10);toc;
    %I = snapshot(cam);
    faceDetect = vision.CascadeObjectDetector();
    bbox=step(faceDetect,I);
    if ~isempty(bbox)
        NotYet = true;
        break;
    end
end
%closepreview;
%clear('cam');
face = imcrop(I,bbox);
Undefined function or variable 'I'.
Error in DetectFaceandEyes (line 9)
    bbox=step(faceDetect,I);
Error in EyeDistance>cropFace_Callback (line 108)
DetectFaceandEyes;
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in EyeDistance (line 42)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)EyeDistance('cropFace_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback