pixelsior: photo management as a platform service for ......pixelsior: photo management as a...
TRANSCRIPT
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Pixelsior: Photo Management as a Platform Service for Mobile Apps
Kyungho Jeon, Sharath Chandrashekhara, Karthik Dantu and Steven Y. Ko
University at Buffalo, The State University of New York
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Photo data is exploding
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● 2 billion mobile devices with cameras were sold in 2014 [Evans 2014]
● 3+ billion photos were shared on Facebook, Snapchat, Instagram, and WhatsApp every day in 2015
Source: KPCB Internet Trends 2016
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Photo apps are so popular
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● Many popular apps have photo-related features ○ Google Photos, Snapchat, Instagram,
Facebook, WhatsApp, ...
● Popular features including...○ Sharing, Editing, Sync, Image analysis
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Popular feature #1: Sharing photos over messaging apps
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Alice Bob
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Popular feature #2: Editing a photo and synchronizing
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Sync
Smartphone Cloud
Applying “Monochrome”
filter
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Popular feature #3: Image analysis
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● E.g., Face recognition
● Use the information to organize and search photos
● Managed as metadata
Source:Google Photos
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How do current apps provide these features and what are the problems?
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Sharing photos over multiple messaging apps
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AliceBob
ChrisResize
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Sharing photos over multiple messaging apps
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AliceBob
ChrisResize
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Sharing photos over multiple messaging apps
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AliceBob
ChrisResizeResize
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Sharing photos over multiple messaging apps
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AliceBob
ChrisResizeResize
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Sharing photos over multiple messaging apps
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AliceBob
ChrisResizeResize
Repeated resizing and duplicate resized image files
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Editing synchronized photos with content adaptation
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Synchronized
Smartphone Cloud
Original size image
"Adapted”: Reduced
size image
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Editing synchronized photos with content adaptation
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Synchronized
Smartphone Cloud
Original size image
"Adapted”: Reduced
size image
I want to apply a filter!
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Editing and synchronizing with content adaptation
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Download
Smartphone Cloud
Original size image
Reduced size
I want to apply a filter!
Original size
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
I want to apply a filter!
Reduced size Original size
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
I want to apply a filter!
Sync
Reduced size Original size
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
I want to apply a filter!
Sync
Reduced size Original size
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
I want to apply a filter!
Reduced size Original size
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
Done!
Reduced size
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
Done!
Unnecessary network and computing operations
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Editing and synchronizing with content adaptation
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Smartphone Cloud
Original size image
Done!
Impossible to edit a photo without a network connectivity
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Image analysis: managing semantic information
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App A runs face recognition algorithm
App B runs face recognition algorithm
MetadataPer-app
MetadataPer-app
File
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Image analysis: managing semantic information
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App A runs face recognition algorithm
App B runs face recognition algorithm
MetadataPer-app
MetadataPer-app
File
Repeated image analyses and individual management of metadata
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Summary of current problems
● Sharing photos○ Repeated resizing computation and redundant resized images
● Editing synchronized, adapted photos○ Propagating updates on adapted photos requires careful implementation
● Image analysis and metadata management○ Repeated analyses from multiple apps and individual metadata management
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Summary of current problems
● Sharing photos○ Repeated resizing computation and redundant resized images
● Editing synchronized, adapted photos○ Propagating updates on adapted photos requires careful implementation
● Image analysis and metadata management○ Repeated analyses from multiple apps and individual metadata management
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Every app implements photo related features individually!
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Research question
What is a better way to manage mobile photo data?
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Pixelsior
● A consolidated shared service, provided by a mobile platform
● An efficient mechanism for photo management functionality
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A new platform for mobile photo data
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Image processing
Image loading
(Meta) Data management
Image processing
Image loading
(Meta) Data management
Before
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Image processing
Image loading
(Meta) Data management
Pixelsior
Image processing
Image loading
(Meta) Data management
Image processing
Image loading
(Meta) Data management
Before After
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Sharing photos over messaging apps
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AliceBob
Chris
Pixelsior
Request: width 800px
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Sharing photos over messaging apps
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AliceBob
Chris
Pixelsior
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Sharing photos over messaging apps
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AliceBob
Chris
Pixelsior
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Sharing photos over messaging apps
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AliceBob
Chris
Pixelsior
Request: width 800px
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Sharing photos over messaging apps
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AliceBob
Chris
Pixelsior
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Sharing photos over messaging apps
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AliceBob
Chris
Pixelsior
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Editing synchronized photos with content adaptation
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Smartphone Cloud
Reduced size image
Pixelsior Pixelsior
Full size image
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Editing synchronized photos with content adaptation
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Smartphone Cloud
Reduced size image
“Grayscale” filter
Pixelsior Pixelsior
Full size image
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Editing synchronized photos with content adaptation
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Smartphone Cloud
Reduced size image
“Grayscale” filter
Apply “Grayscale”
Pixelsior Pixelsior
Full size image
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Editing synchronized photos with content adaptation
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Smartphone Cloud
Reduced size image
“Grayscale” filter
Apply “Grayscale”
“Grayscale” filter
Pixelsior Pixelsior
Full size image
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Semantic information management
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App B retrieves not only photo but also its metadata
App A runs face detection algorithm and updates metadata
Pixelsior
metadata
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Design Space
● Data model● API: a developer’s point of view● Transformation management
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Design: data model
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PixelsiorAPI
Pixelsior Photo store
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Design: APIs
● read and write○ Retrieve a resize depending on app-specific policy (quFile, FAST ‘10)
● search and query○ Organize and search photos with attributes (Semantic File Systems, SOSP ‘91)
○ Query a photo’s metadata and transformation history
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Design: transformation management
● Built-in primitive image transformations○ e.g., blur, brightness, contrast, grayscale, ...
● Customized transformations○ Can be developed as a sequence of primitive transformations○ Can be plugged into the platform so that other apps can use
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Design: transformation management
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Tablet
Phone
Brightness & Contrast: -40%
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Design: transformation management
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Tablet
Phone
Download
Brightness & Contrast: -40%
Resize
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Design: transformation management
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Tablet
Phone
Brightness & Contrast: -40%
Brightness & Contrast: -40%
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Open questions and thoughts (1/2)
● Access control○ Letting apps access a View, e.g., Earp (NSDI ‘16)
● Legacy apps○ Leveraging application rewriting frameworks
■ e.g. BlueMountain (HotStorage ‘15)
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Open questions and thoughts (2/2)
● Other data types, e.g., video, voice mail, ...○ Provide a layered design:
■ Primitive interface layer■ Data type specific layer
● Consistency○ Operation-based synchronization can result in inconsistency○ Handle each transformation case by case
■ Phan et al., MobiSys ‘04
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Summary
● We identified mobile photo management problems● To address the problems, a new platform service, Pixelsior, is
proposed● Currently, we are implementing it!
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