Vision-Based Technologies for Security in LogisticsINFOTECH is the Unit of ROBOTIKER-TECNALIA...
Transcript of Vision-Based Technologies for Security in LogisticsINFOTECH is the Unit of ROBOTIKER-TECNALIA...
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INFOTECH is the Unit of ROBOTIKER-TECNALIA specialised in Research, Development and Application of Information and Communication Technologies (ICT), not only in the enterprise framework but also in the Digital Society.
INFOTECH provides solutions to thoseSectors in which ICT Technologies are the key for generation and/or exploitationof added value:
� Logistic and Industrial Sector� Tourism and Entertainment.
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Technological Areas
� Machine Vision.
� Semantic Technologies.
� Biometry.
� Voice Synthesis and Recognition.
� Trazability.
� Digital Ecosystems.
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Application Areas
CA1Image Processing
CA2Mobile Services
CA3Voice based Services
CA4Supply ChainManagement
Industrial Control Access Control
Infrastructure Security
Visual Content Processsing
Man-Machine Interfaces
Location-based services
Portable Device Services
Picking
Audio Content Processing
Supply Chain Scheduling
Unimodal & multimodal Scheduling
Trazability of people,machines and vehicles
Interoperability
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Machine Vision Overview
� Machine Vision Overview� 3D Image Processing� Biometrics
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Practical Machine Vision
� What is involved in a Machine Vision project??
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Practical Machine Vision
� So, machine vision is not just a matter of computer and image processing algorithms:
�Lighting and optics�Acquisition system�Mechanics�Software�Time�Robustness
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� So, What is Computer Vision and Image Processing?�“Automatic or assisted process of information
acquired by cameras”�Acquisition through visual resources: Hardware Tools�Automatic process: Software
SCENELIGHTSLIGHTSOPTICSOPTICS
HARDWAREHARDWARE
IMAGE IN
MEMORYIMAGE IMAGE PROCESSINGPROCESSING
INFORMATION
RESULTANALYSISANALYSIS
Practical Machine Vision
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� Computers only see a set of numbers. It is necessary to interpret their meaning.
RAW data Processing information Interpretation
Practical Machine Vision
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� Colour Spaces:�RGB: Colour cube. It is used by electronics devices to
represent colours.
�HSL: Colour cone. Luminance (L) is independent from Chrominance (H+S)
�H � Hue�S � Saturation�L � Luminance
Practical Machine Vision
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� In those colour spaces (RGB, HSL…) it is no easy to measure colour similarities
� To create a color space that represents color information as humans see it the CIE Lab space was created
� 3 Parameters: Luminance, ‘a’ and ‘b’ � Advantages: Color difference applying Euclidean Distance
RGB_distance = (R1-R2)^2 + (G1-G2)^2 + (B1-B2)^2 ���� It does not give a color similarity ideaLab_distance = (L1-L2)^2 + (a1-a2)^2 + (b1-b2)^2 ���� It gives a color distance as humans perceive
similar colors.
Practical Machine Vision
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� It is possible to detect non visible characteristics for humans. Some animals as insects or deer have a ultraviolet vision that humans can’t perceive
Visible vs. UV
Practical Machine Vision
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� Near Infrared:�It could be necessary an extra light source�Great penetration
� Mid Infrared �Thermo graphic images
� T – Beams�Higher penetration�Non ionizing
Practical Machine Vision
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� X Beams, Gamma beams…�Here, it is not processed what material reflects, but
what passes through the object and hits into a specific surface
�Due to their high energy and penetration capacity, they are ionizing
Practical Machine Vision
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� Spectrography:� A diffraction net is used to split the light into its different
wavelengths
� Each image pixel is defined by an N-dimension vector where each n-component represent a different wavelength.
� Uses:
�Materials, food, pathogens… classification
�Health�Aerial inspection
Spectrophotometer One pixel spectrumHyper spectral cube
Practical Machine Vision
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� Image Types:
Multidimensional imageImage sequence (video)
3D ImageFloat point image
Practical Machine Vision
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Machine Vision Overview
� Machine Vision Overview� 3D Image Processing� Biometrics
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� Stereoscopic Vision Systems:� It uses 2 or more cameras.
� It needs that all the cameras watch the same scene
�Locating the same point (x, y) in each image it is possible to triangulate the 3D real Point (x, y, z)
�Epipolar points are calculated in calibration step
3D Vision: Stereoscopic
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� Stereoscopic Vision:�Stereovision platforms needs to be calibrated
�A chessboard patter is used to calibrate the platform. It needs several images along the working area
�Stereovision platforms based in two cameras try to simulate the humans sight sense
3D Vision: Stereoscopic
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� Laser Beam Triangulation:
�A laser plane is projected into a region of interest�The intersection between the laser and the surface of
interest creates a shape�This shape is shown from an external camera and is
used to get the 3D information from one section of the object
3D Vision: Laser triangulation
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� Laser Scan:�There are differet ways to get a laser scan for surfaces:
�By movin the object or the set camera + laser
�By using a mirror to get and aditional degree of fredom moving the laser beam
3D Vision: Laser triangulation
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� Structured Light:�Projects a pattern of light on the surface and look at the
deformation of the pattern on it. The pattern may be one dimensional (line) or two dimensional (grid).
�Needs Calibration. The pattern is projected on a calibration object. Watching how the patter is projected on the surface and comparing it with the expected deformation the system is calibrated
3D Vision: Structured Light
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Machine Vision Overview
� Machine Vision Overview� 3D Image Processing� Biometrics
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� What’s biometrics?�A technology.�Can make a Relationship between a Person and a
previously extracted Pattern.�Allows users to Authenticate.
� What does this mean?�You need not know anything (Passwords)�You need not have to anything (Tokens)�All you have to do is BE there
Biometrics: Overview
© ROBOTIKER
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� Identification
� Authentication
© ROBOTIKER
Peter
John
Template
Peter
DataBase
Peter Mary Peter
Peter
Am I Peter ?
Whoam I??
Am I Peter ?
Biometrics: Overview
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� Several terms are used�FAR (False Acceptance Rate)
�% of the users accepted by the system when they should not have been accepted.
�FRR (False Rejection Rate)�% of the users who are rejected by the system when they
should have been accepted.
�ERR (Equal Error Rate)�The point in which FAR and FRR have the same value
�We can work at different levels of security setting a threshold to accept or to reject the doubtful cases
© ROBOTIKER
Biometrics: Definitions
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� It is based on the extraction of fingerprint characteristics
�Minutiaes
� Advantage:�Constant in time�Good precision
� Disadvantages:�People associate fingerprint with police�It is not the most robust biometric system
Biometrics: Fingerprint
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� Feature extraction from the bottom eye’s circulatory structures
� Eye illumination through infrared light� Optic complexity� User profile based on arteries and veins distribution
� Advantage:� Excellent robustness� First commercial system
� Disadvantages:� Intrusive (too much)� Information acquired from the bottom eye
Biometrics: Retina
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Biometrics: Iris
� Feature extraction from the iris texture� Eye location� User profile based on texture analysis. All the algorithms for image processing are valid.
� Advantage:� Precision� Several solutions on the market
� Disadvantages:� Intrusive� Could be non collaborative� There exists the Iridology: medicine based on iris analysis
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Application to Projects
� Biometrics� Surveillance� Hyperspectral based projects
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� Multimodal biometric profile : Several biometric features from one measure.
�Easy for user: only one authentication system�More robust: Different biometric measures to
authenticate for each user
Biometrics: Palmprint recognition
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� Palmprint Recognition prototype
© ROBOTIKER
ComputerScanner
Imageadquisition
system
Remote DataBase
TCP/IP I/O card
Biometrics: Palmprint recognition
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Biometrics: 2D / 3D face recognition
3D Face Model
Extracted Face Points
� Algorithm main steps:�Face orientation detection�Face Points Extraction�2D Face recognition algorithm
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Application to Projects
� Biometrics� Surveillance� Hyperspectral based projects
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� Multiview worker tracking�Multicamera: One camera for each view�Object detector for each camera�Algorithm for data coherence: fusion of the multicamera
objects detection.�Non collaborative RFID readers: worker identification�Space coordinates transform: from camera space (3D
world) to plane (2D space)
� System features�Restricted areas intrusion detector.�Abandoned object detector.�Morphological detector: Humans / Trucks / Others
Surveillance: worker tracking
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Surveillance: worker tracking
� Each camera has its own object detector and plane-space transform algorithm
� With the Plant Locator Viewer it is possible to combine the different camera data with the RFID information for worker identification
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Application to Projects
� Biometrics� Surveillance� Hyperspectral based projects
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� Use of hyperspectral images for material classification.�Distinguish from same colour materials�Detection of “hiden” objects�…
Hyperspectral process
Wavelength (nm)
250 500 750 1000 1250
)(λrLVisible
Spectrum
Hyperspectral pixel
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� Materials which seems to have the same colour can be easily distinguish analysing their hyperspectral response
Hyperspectral process
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CONCLUSIONS
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� Image processing is a “mature” technology, not only a laboratory one.
� Biometric with image processing:
� It is a robust technology.
� It offers a high reliability.
�There are several different techniques.
� Security tasks…
� Image processing can solve lots of surveillance issues.
� Image processing can be applied to a large number of applications
Conclusions
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� Image Processing is more than algorithms.
� Optics, lights, mechanical system are at least as important as agood algorithm.
� Use the constrains of the application to simplify algorithms.
Conclusions
© ROBOTIKER