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Digital Image Stabilization
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Digital Image Stabilization老師 : 楊士萱
學生 : 鄭馥銘
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OutlineIntroduction
Basic architecture of DIS
MVI method for DIS
Future work
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IntroductionAn image stabilization system manages
to remove unwanted movement form
an image sequence
Previous image stabilization system
accelerometers, gyros, mechanical dampers ,
angular velocity sensors…………..
We prefer to use DIS
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Basic architecture of DISInput
Pre-processing
Stabilization
Stabilized
Input
Video Encoder
Video Decoder
Output
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Basic architecture of DISstabilization-aided encoder
Stabilization
Input
Video Encoder
Video Decoder
Output
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Basic architecture of DISstabilization-aided decoder
Stabilization
Input
Video Encoder
Video Decoder
Output
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MVI Method for DISMVI : Motion Vector Integration
Basic idea :
Using some propose method to find reliable local
motion vector(LMV)
Calculate the global motion vector(GMV) form LMV.
Integrating the previous frame GMV and current
frame GMV to calculate AMV.
Using AMV to compensate current frame to be
stabilized frame.
Reference paper [1-4]
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New Algorithm and Architecture of DigitalImage stabilization System
CCD
A/D
DIS for
FM
Video
Encoder
Block diagram of a digital video camera with DIS
system.
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New Algorithm and Architecture of DigitalImage stabilization System
Lack of features
Existence of moving objects
Intentional panning
Existence of repeated patterns
Intentional zooming
Low signal-to-noise ratio
Large movement out of the searching range of
block matching
Complicated Motion (e.g. rotatory motion)
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A general structure of DIS system withframe memory
Preprocessing
Motion
Estimation
Motion
Decision
Motion
Compensation
Frame
Register
Frame
Memory
Stabilized
images
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Pre-ProcessingPreprocessing
Motion
Estimation
Motion
Decision
Motion
Compensation
Frame
Register
Frame
Memory
Stabilized
images
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Pre-ProcessingBlock Matching over Bit-Planes
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Pre-ProcessingBlock Matching over Gray-Code BitPlanes
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Motion EstimationPreprocessing
Motion
Estimation
Motion
Decision
Motion
Compensation
Frame
Register
Frame
Memory
Stabilized
images
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Motion Estimation18.
Motion Estimation19.
Motion DecisionPreprocessing
Motion
Estimation
Motion
Decision
Motion
Compensation
Frame
Register
Frame
Memory
Stabilized
images
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Motion Decision(Lack-of-Feature Condition)
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Motion Decision(Lack-of-Feature Condition)
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Motion Decision(Lack-of-Feature Condition)
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Motion Decision(Existence of Moving Objects)
Random-like motion
temporally correlated motion
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Motion Decision(Existence of Moving Objects)
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Motion Decision(Intentional Panning Condition)
If 80% of the VALID_LMV are detected as
temporally correlated motion, we consider
that the camera is under a panning condition
and no motion compensation is needed
Otherwise, we assume that these temporally
correlated motion vectors are caused by
some moving objects in the image.
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Motion Decision(Optical Zooming Condition)
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Motion Decision(Spatial Noise Checking of Noise Level)
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Procedure of Motion Decision29.
Procedure of Motion Decision30.
Motion CompensationFrame Motion Vector (FMV)
Accumulated Motion Vector (AMV)
Motion Compensation
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SimulationResult
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Future workUnderstanding mpeg4 framework in
order to write my propose method
program in it.
stabilization-aided encoder
Stabilization
Input
Video Encoder
Video Decoder
Output