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MOBILE IMAGE PROCESSING https://flic.kr/p/qRJKUz Tim Kadlec | @tkadlec
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https://flic.kr/p/aShfSP
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https://flic.kr/p/oPn6ZV
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10% of photos ever 2012 Source: http://time.com/3445111/#1
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Source: http://time.com/3445111/#1 1839 2012 2011 172 years, 90%
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Source: http://time.com/3445111/#1 1839 2012 2011 1 year, 10%
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billion photos PER DAY Source: http://www.kpcb.com/internet-trends 1.8
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Source: May 1st run of http://httparchive.org 789kb Everything else 1310kb Images
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Source: May 1st run of http://httparchive.org 36.5% Everything else 62.4% Images
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360px x 202px
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1280px x 520px
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Request Decode Copy to GPU Display
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Request Copy to GPU Display Decode
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1280px x 520px
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Source: May 1st run of http://httparchive.org 46% JPG 29% PNG 23% GIF 2% Other
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RGB to YUV Chroma Subsampling DCT / Quantization Huffman Encoding
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RGB to YUV Chroma Subsampling DCT / Quantization Huffman Encoding
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RGB to YUV Chroma Subsampling DCT / Quantization Huffman Encoding
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RGB to YUV Chroma Subsampling DCT / Quantization Huffman Encoding
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RGB to YUV Chroma Subsampling DCT / Quantization Huffman Encoding
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YUV to RGB Chroma Upsampling iDCT / Dequantization Huffman Decoding
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Resized: 7.86ms
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Resized: 7.86ms Double: 26.34ms
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Resized: 7.86ms Double: 26.34ms Large: 266.49ms
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Resized: 7.86ms Double: +235.1% Large: +3291.7%
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2GB RAM Quad-core 1.5 GHz Krait CPU Adreno 320 GPU
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Resized: 30.38ms
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Resized: 30.38ms Double: 102.77ms
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Resized: 30.38ms Double: 102.77ms Large (6x): 1,534.99ms
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Resized: 30.38ms Double: +238.3% Large (6x): +4952.6%
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RESIZE IMAGES
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RESIZE IMAGES
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Request Display Decode Copy to GPU
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Request Copy to GPU Display Store in memory Decode
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R: 65 G: 47 B: 35 A: 1 R: 26 G: 26 B: 29 A: 1 R: 30 G: 29 B: 32 A: 1
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W x H x 4
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1280px x 520px
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1280 x 520 x 4
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1280 x 520 x 4 2,662,400
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2.54 MB 1280 x 520 x 4
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“…25% of new Android phones have only 512MB of RAM.” Jen Fitzpatrick VP of product management for Google Maps
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360 x 202 x 4
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360 x 202 x 4 290,880
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- 290,880 2,662,400 2,371,520
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2.26 MB
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270px x 936px 987 kb
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RESIZE IMAGES
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600px x 600px 200px x 200px
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550px x 550px 150px x 150px
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(600 x 600 - 550 x 550) x 4 = 230,000 wasted bytes
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(200 x 200 - 150 x 150) x 4 = 70,000 wasted bytes 230,000 wasted bytes
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70,000 wasted bytes 230,000 wasted bytes
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700px 1200px 200px
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1200px 200px 700px
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MEMORY BATTERY LIFE OF DEVICE CPU/GPU OVERHEAD
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iDCT / Dequantization Huffman Decoding Chroma Upsampling YUV to RGB
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Luma (light) Chroma (color)
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Y CB CR
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Chroma Subsampling
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J : a : b
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4 : a : b
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4 : 4 : 4
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4
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4 4
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4 4 4 8 total
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4 : 2 : 2
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4
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4 2
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2 2 4 4 total (50% savings)
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4 : 1 : 1
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4
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4 1
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4 1 1 2 total (75% savings)
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4 : 2 : 0
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4
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4 2
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4 2 0 2 total (75% savings)
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Request Decode Copy to GPU Display
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Request Decode Copy to GPU Display Decode
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(W x H x 3) - (W x H x SUBSAMPLE_LEVEL x 2)
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RGBA 2,662,400 4:4:4 1,996,800 4:2:2 1,331,200 4:2:0 998,400 1280px x 520px
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62.5% memory savings 4:2:0 Source: http://time.com/3445111/#1
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> 26MB
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Browser OS
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Browser OS Psst….need some memory?
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Browser OS Yeah, I’ll take some of that.
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iDCT / Dequantization Huffman Decoding Chroma Upsampling YUV to RGB
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Resized: 30.38ms
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Resized: 5.62ms
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Resized: 5.62ms Double: 102.77ms
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Resized: 5.62ms Double: 27.74ms
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Resized: 5.62ms Double: 27.74ms Large (6x): 1534.99ms
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Resized: 5.62ms Double: 27.74ms Large (6x): 462.11ms
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Resized: 5.62ms Double: +393.6% Large (6x): +8122.6%
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MICRO-OPTIMIZATIONS?
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“…as bandwidth grows, and as processing power grows, and as browsers get better we just keep filling everything up. ” Jeff Veen
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NETWORK MEMORY BATTERY LIFE OF DEVICE CPU/GPU OVERHEAD
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RESIZE IMAGES 1
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RESIZE IMAGES 1 2 SMALL BREAKPOINTS FOR LARGE IMAGES
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RESIZE IMAGES 1 2 META VIEWPORT IS YOUR FRIEND 3 SMALL BREAKPOINTS FOR LARGE IMAGES
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RESIZE IMAGES 1 2 META VIEWPORT IS YOUR FRIEND 3 USE 4:2:0 SUBSAMPLING 4 SMALL BREAKPOINTS FOR LARGE IMAGES
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THANK YOU Tim Kadlec | @tkadlec