【发布时间】：2018-04-26 01:12:10
【问题描述】：
我的 Ubuntu 机器上安装了 Matlab 2018a（Linux 版）。我正在尝试计算出现上述错误的视频的光流。谷歌搜索表明这可能是由两个问题引起的，要么是旧版本的 Matlab（如 2009），要么可能没有安装计算机视觉工具箱。
我有最新版本的 Matlab，但仍然收到此错误，我还安装了所需的工具箱，从 ver 的输出命令中可以看出
>> ver
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MATLAB Version: 9.4.0.813654 (R2018a)
MATLAB License Number: 893265
Operating System: Linux 4.13.0-38-generic #43~16.04.1-Ubuntu SMP Wed Mar 14 17:48:43 UTC 2018 x86_64
Java Version: Java 1.8.0_144-b01 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
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MATLAB Version 9.4 (R2018a)
Simulink Version 9.1 (R2018a)
Aerospace Blockset Version 3.21 (R2018a)
Aerospace Toolbox Version 2.21 (R2018a)
Antenna Toolbox Version 3.1 (R2018a)
Audio System Toolbox Version 1.4 (R2018a)
Automated Driving System Toolbox Version 1.2 (R2018a)
Bioinformatics Toolbox Version 4.10 (R2018a)
Communications System Toolbox Version 6.6 (R2018a)
Computer Vision System Toolbox Version 8.1 (R2018a)
Control System Toolbox Version 10.4 (R2018a)
Curve Fitting Toolbox Version 3.5.7 (R2018a)
DSP System Toolbox Version 9.6 (R2018a)
Database Toolbox Version 8.1 (R2018a)
Datafeed Toolbox Version 5.7 (R2018a)
Econometrics Toolbox Version 5.0 (R2018a)
Embedded Coder Version 7.0 (R2018a)
Filter Design HDL Coder Version 3.1.3 (R2018a)
Financial Instruments Toolbox Version 2.7 (R2018a)
Financial Toolbox Version 5.11 (R2018a)
Fixed-Point Designer Version 6.1 (R2018a)
Fuzzy Logic Toolbox Version 2.3.1 (R2018a)
GPU Coder Version 1.1 (R2018a)
Global Optimization Toolbox Version 3.4.4 (R2018a)
HDL Coder Version 3.12 (R2018a)
HDL Verifier Version 5.4 (R2018a)
Image Acquisition Toolbox Version 5.4 (R2018a)
Image Processing Toolbox Version 10.2 (R2018a)
Instrument Control Toolbox Version 3.13 (R2018a)
LTE HDL Toolbox Version 1.1 (R2018a)
LTE System Toolbox Version 2.6 (R2018a)
MATLAB Coder Version 4.0 (R2018a)
MATLAB Compiler Version 6.6 (R2018a)
MATLAB Compiler SDK Version 6.5 (R2018a)
MATLAB Report Generator Version 5.4 (R2018a)
Mapping Toolbox Version 4.6 (R2018a)
Model Predictive Control Toolbox Version 6.1 (R2018a)
Neural Network Toolbox Version 11.1 (R2018a)
Optimization Toolbox Version 8.1 (R2018a)
Parallel Computing Toolbox Version 6.12 (R2018a)
Partial Differential Equation Toolbox Version 3.0 (R2018a)
Phased Array System Toolbox Version 3.6 (R2018a)
Polyspace Bug Finder Version 2.5 (R2018a)
Polyspace Code Prover Version 9.9 (R2018a)
Powertrain Blockset Version 1.3 (R2018a)
Predictive Maintenance Toolbox Version 1.0 (R2018a)
RF Blockset Version 7.0 (R2018a)
RF Toolbox Version 3.4 (R2018a)
Risk Management Toolbox Version 1.3 (R2018a)
Robotics System Toolbox Version 2.0 (R2018a)
Robust Control Toolbox Version 6.4.1 (R2018a)
Signal Processing Toolbox Version 8.0 (R2018a)
SimBiology Version 5.8 (R2018a)
SimEvents Version 5.4 (R2018a)
Simscape Version 4.4 (R2018a)
Simscape Driveline Version 2.14 (R2018a)
Simscape Electronics Version 2.13 (R2018a)
Simscape Fluids Version 2.4 (R2018a)
Simscape Multibody Version 5.2 (R2018a)
Simscape Power Systems Version 6.9 (R2018a)
Simulink 3D Animation Version 8.0 (R2018a)
Simulink Check Version 4.1 (R2018a)
Simulink Code Inspector Version 3.2 (R2018a)
Simulink Coder Version 8.14 (R2018a)
Simulink Control Design Version 5.1 (R2018a)
Simulink Coverage Version 4.1 (R2018a)
Simulink Design Optimization Version 3.4 (R2018a)
Simulink Design Verifier Version 3.5 (R2018a)
Simulink Report Generator Version 5.4 (R2018a)
Simulink Requirements Version 1.1 (R2018a)
Simulink Test Version 2.4 (R2018a)
Stateflow Version 9.1 (R2018a)
Statistics and Machine Learning Toolbox Version 11.3 (R2018a)
Symbolic Math Toolbox Version 8.1 (R2018a)
System Identification Toolbox Version 9.8 (R2018a)
Text Analytics Toolbox Version 1.1 (R2018a)
Trading Toolbox Version 3.4 (R2018a)
Vehicle Dynamics Blockset Version 1.0 (R2018a)
Vehicle Network Toolbox Version 4.0 (R2018a)
Vision HDL Toolbox Version 1.6 (R2018a)
WLAN System Toolbox Version 1.5 (R2018a)
Wavelet Toolbox Version 5.0 (R2018a)
使用命令opticalFlowClass = vision.OpticalFlow('OutputValue', Horizontal and vertical components in complex form', 'Method', 'Horn-Schunck') 计算OpticalFlow 时出现以下错误：
Undefined variable "vision" or class "vision.OpticalFlow".
Error in Video2OpticalFlow (line 28)
opticalFlowClass = vision.OpticalFlow('OutputValue', ...
有人可以指导我为什么会收到此错误吗？ 谢谢
【问题讨论】：
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@SardarUsama 我尝试添加更多细节