Two camera previews in one Matlab GUIDE window

So I made a custom GUI with GUIDE to see my two camera previews next to each other. It contains a panel and two axes inside. Im using two gige vision cameras that record video not in color but in black and white or gray I should say.

Im having the following problems:

I always get only one camera preview, at least a black screen on the left axes and nothing on the right. I would like to know what Im doing wrong here.

axes(handles.axes1);

axes(handles.axes2);

Another problem is:

image(zeros(1082,1312,3)

At first I do not know which resolutions are available for my cameras and the imaqtool only tells me mon8, or mono12...

The 3 at the end means TrueColor and I know that my cameras only produce gray images. So what do I have to put in here then?

And at last, I would like to know what you guys think of the rest of the code shown below?

function varargout = example1(varargin)
% EXAMPLE1 MATLAB code for example1.fig
%      EXAMPLE1, by itself, creates a new EXAMPLE1 or raises the existing
%      singleton*.
%
%      H = EXAMPLE1 returns the handle to a new EXAMPLE1 or the handle to
%      the existing singleton*.
%
%      EXAMPLE1('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in EXAMPLE1.M with the given input arguments.
%
%      EXAMPLE1('Property','Value',...) creates a new EXAMPLE1 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before example1_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to example1_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help example1

% Last Modified by GUIDE v2.5 08-Sep-2017 13:02:13

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @example1_OpeningFcn, ...
                   'gui_OutputFcn',  @example1_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
% End initialization code - DO NOT EDIT

% --- Executes just before example1 is made visible.
function example1_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to example1 (see VARARGIN)

% Choose default command line output for example1
handles.output = hObject;

axes(handles.axes1);
axes(handles.axes2);
vid1 = videoinput('gige', 1,'Mono8');
vid2 = videoinput('gige', 2,'Mono8');
hImage1 = image(zeros(1082,1312,3),'Parent',handles.axes1);
hImage2 = image(zeros(1082,1312,3),handles.axes2);
src1 = getselectedsource(vid1);
src2 = getselectedsource(vid2);
set(vid1,'TriggerRepeat',inf);
set(vid2,'TriggerRepeat',inf);
src1.AcquisitionStartTriggerMode = 'On';
src2.AcquisitionStartTriggerMode = 'On';
triggerconfig(vid1, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
triggerconfig(vid2, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
src1.AcquisitionStartTriggerActivation = 'FallingEdge';
src2.AcquisitionStartTriggerActivation = 'FallingEdge';
src1.AcquisitionStartTriggerSource = 'Line1';
src2.AcquisitionStartTriggerSource = 'Line1';

preview(vid1, hImage1);
preview(vid2, hImage2);
imaqmem(1000000000000);

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes example1 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = example1_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

[Ben Drebing]

Could this be part of the issue?

https://www.mathworks.com/matlabcentral/answers/73088-image-acquisition-toolbox-imaqtool-gets-only-black-images

[Jayant]

@Marcel have you found any solution on this issue? as i am having the same issue. Troubling with it.

@Ben Drebing this is not the solution. Its something different issue.