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Strata: Layered Coding for Scalable Visual Communication
Strata: Layered Coding for Scalable Visual Communication
Strata: Layered Coding for Scalable Visual Communication
Strata: Layered Coding for Scalable Visual Communication
Strata: Layered Coding for Scalable Visual Communication
Strata: Layered Coding for Scalable Visual Communication
You may have seen these…
You may have seen these…
You may have seen these…
You may have seen these…
You may have seen these…
You may have seen these…
You may have seen these…
You may have seen these…
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
Smartphone cameras as “receivers”
… everywhere
… everywhere
… everywhere
… everywhere
… everywhere
… everywhere
… everywhere
… everywhere
Existing codes: All or nothing
Existing codes: All or nothing
Multi-resolution information display
Multi-resolution information display
Multi-resolution information display
Multi-resolution information display
Diverse camera hardware
Diverse camera hardware
Diverse camera hardware
Diverse camera hardware
Diverse camera hardware
Diverse camera hardware
Diverse camera hardware
Diverse camera hardware
Capture distance vs resolution
Capture distance vs resolution
Spatial undersampling
Spatial undersampling
Spatial undersampling
Spatial undersampling
Spatial undersampling
Spatial undersampling
Color mixing experiment
Color mixing experiment
Color mixing experiment
Color mixing experiment
Color mixing experiment
Color mixing experiment
Color mixing results
Color mixing results
Example 2-layer code
Example 2-layer code
Harnessing more bits
Harnessing more bits
Example Strata image
Example Strata image
Decoder implementation
Decoder implementation
Performance (spatial)
Performance (spatial)
Performance (spatial)
Performance (spatial)
Strata vs Single-layer code
Strata vs Single-layer code
Strata vs Single-layer code
Strata vs Single-layer code
Strata vs Single-layer code
Strata vs Single-layer code
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Автор: Wenjun Hu. Чтобы познакомиться с картинкой полного размера, нажмите на её эскиз. Чтобы можно было использовать все картинки для урока информатики, скачайте бесплатно презентацию «Strata: Layered Coding for Scalable Visual Communication.ppt» со всеми картинками в zip-архиве размером 4840 КБ.

Strata: Layered Coding for Scalable Visual Communication

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1Strata: Layered Coding for Scalable 24different positions.
Visual Communication. Wenjun Hu Jingshu 25Example 2-layer code. Base layer
Mao Zihui Huang Yiqing Xue Junfeng She block. Enhancement layer block.
Kaigui Bian Guobin (Jacky) Shen. 26Recursively adding layers. Divide each
2You may have seen these… enhancement block further Follow the same
3Smartphone cameras as “receivers”. rule otherwise. Reserved block.
4… everywhere. (In)Dependency between layers: structural,
5Existing codes: All or nothing. Camera but not the information encoded. Base
view. Minimum resolution needed. layer (2nd layer) block. Enhancement layer
6Multi-resolution information display. (3rd layer) block.
7Diverse camera hardware. Lumia 1020 27Harnessing more bits. Adding smaller
~38MP, 30fps. Nexus 5 8MP, 30fps. iPhone 4 (third-layer) blocks in the reserved
5MP, 30fps. iPhone 5s 8MP, 120fps. block.
8Capture distance vs resolution. 28Harnessing more bits. Doubles the
9Our goal. Multi-resolution encoding third-layer capacity Can further add
and decoding Analogous to HM and SVC for fourth-layer blocks.
scalable channel/source coding Decoding 29Choice of parameters. Reserved block
performance scales with receiver size Efficiency vs accuracy tradeoff Need
capability and channel condition. ? when not knowing input statistics
10In the rest of the talk… Undersampled “Branching factor” Control of granularity
channel Strata design Strata performance 16 offers a good tradeoff Details in the
Focus on spatial, analogous for temporal paper.
See paper for temporal mixing, code 30Decoding.
design, and performance results. 31Decoding. Divide into blocks Start
11Undersampled channel. with Layer 1 Determine per-block colors 11
12Spatial undersampling. Original image. blacks, 5 whites Majority gives overall
Captured at 28m , enlarged. block color (black).
13Spatial undersampling. In theory, 32Decoding. Continue with finer blocks
linear mixing of pixel colors In practice, Stop if can’t divide further.
messier… (Auto-)Focus, exposure, contrast 33Strata performance.
Noise at block edges … 34Example Strata image. 20cm x 20cm on
14Color mixing experiment. Patterns of screen, no error correction.
alternating squares. 35Decoder implementation. Online Android
15Color mixing results. app & Offline version. Multi-level
16Color mixing results. For the same decoded info. Strata test display.
distance, close to linear color mixing. 36Performance metric. Goal recap: The
17Color mixing results. Darker when amount of information decoded scales with
further away White is better preserved. capture resolution/rate Metric: decodable
18Color mixing results. Less grayscale bit/layer count.
difference if minimal contrast. 37Performance (spatial).
19Strata Design. 38Performance (spatial).
20Toy example. 2 layers Black overall 39Strata vs Single-layer code.
Also small blocks Small white blocks are 40Strata vs Single-layer code.
interference. 41Strata vs Single-layer code. Strata
21A simple SNR (like) model. Signal = # balances capacity and supported distance.
of small blocks of the intended color 42Other comparison results. Strata vs
Noise = # of small blocks of other colors frequency domain encoding Strata vs
Both noise and interference This actually multi-level grayscales Strata vs group of
reflects color mixing weights for codes Details in the paper.
monochrome codes. 43Related work. Temporal barcode design
22A simple SNR (like) model. If SNR > (inter-frame) Unsynchronized 4D Barcodes
1, the overall block carries at least 1 Spatial barcode design (per-frame layout)
bit of information Its color can be PixNet, COBRA Visual tags Hierarchical
determined Key: Control noise/interference coding on LED arrays Other work on visible
“Reserve” the color of some blocks. light communications E.g., Visual MIMO.
23Basic design. 2-layer structure, with 44Conclusion. Diverse
reserved block. Reserved block. Base layer screen/surface-camera channels Hardware
block. Enhancement layer block. Ensures diversity Capture conditions vary Strata:
black majority Contiguous to mitigate Layered coding for scalability The amount
issues in color mixing. of information decoded scales with diverse
24Harnessing additional bits. Bits from channel conditions.
reserved block shape. 2 bits from 4 45Thank you! Questions?
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Strata: Layered Coding for Scalable Visual Communication

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