I get "Undefined variable "vision" or class "vision.CascadeObjectDetector"" error in matlab
I try to detect faces in image using matlab. I found many demos for this purpose. All demos are using vision.CascadeObjectDetector class. But my matlab always throws exception that is "Undefined variable "vision" or class "vision.CascadeObjectDetector", even trying to call vision class in command window
Computer Vision System Toolbox was already installed.
Where is the problem and how can I solve it?
Installed toolbox list;
MATLAB Version 7.13 (R2011b)
Simulink Version 7.8 (R2011b)
Aerospace Blockset Version 3.8 (R2011b)
Aerospace Toolbox Version 2.8 (R2011b)
Bioinformatics Toolbox Version 4.0 (R2011b)
Communications System Toolbox Version 5.1 (R2011b)
Computer Vision System Toolbox Version 4.1 (R2011b)
Control System Toolbox Version 9.2 (R2011b)
Curve Fitting Toolbox Version 3.2 (R2011b)
DO Qualification Kit Version 1.5 (R2011b)
DSP System Toolbox Version 8.1 (R2011b)
Data Acquisition Toolbox Version 3.0 (R2011b)
Database Toolbox Version 3.10 (R2011b)
Datafeed Toolbox Version 4.2 (R2011b)
EDA Simulator Link Version 3.4 (R2011b)
Econometrics Toolbox Version 2.0.1 (R2011b)
Embedded Coder Version 6.1 (R2011b)
Filter Design HDL Coder Version 2.9 (R2011b)
Financial Derivatives Toolbox Version 5.8 (R2011b)
Financial Toolbox Version 4.1 (R2011b)
Fixed-Income Toolbox Version 2.2 (R2011b)
Fixed-Point Toolbox Version 3.4 (R2011b)
Fuzzy Logic Toolbox Version 2.2.14 (R2011b)
Global Optimization Toolbox Version 3.2 (R2011b)
IEC Certification Kit Version 2.0 (R2011b)
Image Acquisition Toolbox Version 4.2 (R2011b)
Image Processing Toolbox Version 7.3 (R2011b)
Instrument Control Toolbox Version 3.0 (R2011b)
MATLAB Builder EX Version 2.1 (R2011b)
MATLAB Builder JA Version 2.2.3 (R2011b)
MATLAB Builder NE Version 4.1 (R2011b)
MATLAB Coder Version 2.1 (R2011b)
MATLAB Compiler Version 4.16 (R2011b)
MATLAB Distributed Computing Server Version 5.2 (R2011b)
MATLAB Report Generator Version 3.11 (R2011b)
Mapping Toolbox Version 3.4 (R2011b)
Model Predictive Control Toolbox Version 4.0 (R2011b)
Model-Based Calibration Toolbox Version 4.3 (R2011b)
Neural Network Toolbox Version 7.0.2 (R2011b)
OPC Toolbox Version 3.1 (R2011b)
Optimization Toolbox Version 6.1 (R2011b)
Parallel Computing Toolbox Version 5.2 (R2011b)
Partial Differential Equation Toolbox Version 1.0.19 (R2011b)
Phased Array System Toolbox Version 1.1 (R2011b)
RF Toolbox Version 2.9 (R2011b)
Robust Control Toolbox Version 4.0 (R2011b)
Signal Processing Toolbox Version 6.16 (R2011b)
SimBiology Version 4.0 (R2011b)
SimDriveline Version 2.1 (R2011b)
SimElectronics Version 2.0 (R2011b)
SimEvents Version 4.0 (R2011b)
SimHydraulics Version 1.10 (R2011b)
SimMechanics Version 3.2.3 (R2011b)
SimPowerSystems Version 5.5 (R2011b)
SimRF Version 3.1 (R2011b)
Simscape Version 3.6 (R2011b)
Simulink 3D Animation Version 6.0 (R2011b)
Simulink Code Inspector Version 1.0 (R2011b)
Simulink Coder Version 8.1 (R2011b)
Simulink Control Design Version 3.4 (R2011b)
Simulink Design Optimization Version 2.0 (R2011b)
Simulink Design Verifier Version 2.1 (R2011b)
Simulink Fixed Point Version 7.0 (R2011b)
Simulink HDL Coder Version 2.2 (R2011b)
Simulink PLC Coder Version 1.2.1 (R2011b)
Simulink Report Generator Version 3.11 (R2011b)
Simulink Verification and Validation Version 3.2 (R2011b)
Spreadsheet Link EX Version 3.1.4 (R2011b)
Stateflow Version 7.8 (R2011b)
Statistics Toolbox Version 7.6 (R2011b)
Symbolic Math Toolbox Version 5.7 (R2011b)
System Identification Toolbox Version 7.4.3 (R2011b)
SystemTest Version 2.6.2 (R2011b)
Vehicle Network Toolbox Version 1.5 (R2011b)
Wavelet Toolbox Version 4.8 (R2011b)
xPC Target Version 5.1 (R2011b)
xPC Target Embedded Option Version 5.1 (R2011b)
Answer
This error strongly points toward the computer vision system toolbox not being installed.
To make sure that it is installed, type ver at the Matlab command prompt. For me, this outputs:
>> ver
-------------------------------------------------------------------------------------------------------
MATLAB Version: 8.0.0.783 (R2012b)
MATLAB License Number: xxxxxx (edited out)
Operating System: Linux 2.6.35-32-generic #67-Ubuntu SMP Mon Mar 5 19:39:49 UTC 2012 x86_64
Java Version: Java 1.6.0_26-b03 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
-------------------------------------------------------------------------------------------------------
MATLAB Version 8.0 (R2012b)
Simulink Version 8.0 (R2012b)
Curve Fitting Toolbox Version 3.3 (R2012b)
Fuzzy Logic Toolbox Version 2.2.16 (R2012b)
Global Optimization Toolbox Version 3.2.2 (R2012b)
Image Acquisition Toolbox Version 4.4 (R2012b)
Image Processing Toolbox Version 8.1 (R2012b)
M2HTML Toolbox - A Documentation Generator for ... Version 1.5
MATLAB Coder Version 2.3 (R2012b)
MATLAB Compiler Version 4.18 (R2012b)
Mapping Toolbox Version 3.6 (R2012b)
Neural Network Toolbox Version 8.0 (R2012b)
Optimization Toolbox Version 6.2.1 (R2012b)
Parallel Computing Toolbox Version 6.1 (R2012b)
Partial Differential Equation Toolbox Version 1.1 (R2012b)
Signal Processing Toolbox Version 6.18 (R2012b)
Statistics Toolbox Version 8.1 (R2012b)
Symbolic Math Toolbox Version 5.9 (R2012b)
System Identification Toolbox Version 8.1 (R2012b)
Wavelet Toolbox Version 4.10 (R2012b)
As you can see, I do not have this toolbox installed. Do you?