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David thomasson

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    David thomasson David thomasson Presentation Transcript

    • www.axis.com Network Video – Image Usability David Thomasson Business Development Manager - Transportation
    • www.axis.com F Image Usability - Timetable TIME DESTINATION 00:01 Analogue to Network Video 00:03 Resolution - HDTV 00:04 How Many Pixels? 00:10 Pixel Density v Resolution 00:12 Corridor Format 00:13 Light 00:14 More Than Security
    • From Analogue to Network Video
    • www.axis.com Detection Prioritization Response Investigation Security Incidents – The Challenges
    • www.axis.com Surveillance Systems Analogue Digital PredictiveReal-timeForensic > Yesterday – investigate after something has happened > Today – act on incidents in real-time > Tomorrow – predict incidents before they happen Network Video
    • Resolution
    • www.axis.com HDTV Analogue Camera (JPEG image) Interlaced Scan Network Video Camera (JPEG image) Progressive Scan SMPTE HDTV Standards guarantee: > Spatial resolution - 16:9 – SMPTE 296M 1280x720 720p – SMPTE 274M 1920x1080 1080i/p > Better colour representation > Full frame rate > Improved audio > Pan, Tilt & Zoom (PTZ)
    • How Many Pixels?
    • www.axis.com What Level of Detail is Required? There are three main quality levels normally used to determine the image detail required for a camera:  Detection: To detect the presence of a person in the image, without needing to see their face.  Recognition: To recognise somebody you know, or determine that somebody is not known to you.  Identification: To record high quality facial images which can be used in court to prove someone’s identity beyond reasonable doubt.
    • www.axis.com Historically with analogue systems these levels were defined using a percentage (%) of the screen height: Detection: What Level of Detail is Required - Analogue? 10%
    • www.axis.com Recognition: Historically with analogue systems these levels were defined using a percentage (%) of the screen height: What Level of Detail is Required - Analogue? 50%
    • www.axis.com Identification: Historically with analogue systems these levels were defined using a percentage (%) of the screen height: What Level of Detail is Required - Analogue? 120%
    • www.axis.com  For Network Video systems we need a measurement system that is:  Consistent for all camera resolutions  Consistent for all specifiers, manufacturers etc.  Easy to use and define What Level of Detail is Required – Network Video? Analogue Network Video (IP) Detection 10% 25 pix/m Recognition 50% 125 pix/m Identification 120% 250 pix/m (500pix/m)  Horizontal Pixels per Metre defines image quality  EN50132-7: CCTV Surveillance Systems for use in Security Applications - Part 7
    • www.axis.com 1 m Pixels per Metre 250
    • www.axis.com 1 m 250 pixels Pixels per Metre 250
    • www.axis.com Pixels per Metre = 250 pix/m > 250 pix/m < 250 pix/m 250
    • www.axis.com HD Camera View Examples (1280 x 720 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Bird’s Eye View) Blind area Vertical View 250px/m 250px/m 125px/m 125px/m
    • www.axis.com 5MP Camera View Examples (2592 x 1944 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Bird’s Eye View) 250px/m 250px/m 125px/m 125px/m Blind area Vertical View
    • Pixel Density v Camera Resolution
    • www.axis.com You will always get a better pixel density from a higher resolution camera. True or False? It depends on the Field of View (FoV). If the FoV is the same, the higher resolution camera gives a better pixel density. If the FoV is different, a lower resolution camera may provide a better pixel density. Pixel Density v Camera Resolution
    • www.axis.com Resolution Comparison Resolution: HD1080p 118° Resolution: HD720p 80° 2m Scene width of 3.36m Scene width of 6.66m = 381 pix/m 1280 pixels 3.36m = 288 pix/m 1920 pixels 6.66m
    • www.axis.com Higher Resolution Increases Image Area (with Same Pixel Density) 5 Megapixel 3 Megapixel 1080p1080p
    • Bandwidth and Storage
    • www.axis.com RECEPTION SCHOOL YARD INTERSECTION STAIRWAY STATION RESOLUTION Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) VGA 0.13 1.38 0.20 2.21 0.24 2.62 0.31 3.33 0.92 9.89 720p 0.38 4.13 0.61 6.62 0.73 7.86 0.93 10.00 2.75 29.70 1080p 0.86 9.29 1.38 14.90 1.64 17.70 2.08 22.50 6.18 66.70 3MP 1.31 14.10 2.09 22.60 2.49 26.80 3.16 34.10 9.37 101.00 5MP 2.04 22.00 3.27 35.30 3.88 41.90 4.94 53.40 14.60 158.00 Settings: 12 images per second, H.264, Image compression 30, Continuous recording Bandwidth & Storage Comparisons
    • www.axis.com  For Network Video systems we need a measurement system that is:  Consistent for all camera resolutions  Consistent for all specifiers, manufacturers etc.  Easy to use and define What Level of Detail is Required – Network Video? Analogue Network Video (IP) Detection 10% 25 pix/m Recognition 50% 125 pix/m Identification 120% 250 pix/m (500pix/m)  Horizontal Pixels per Metre defines image quality  EN50132-7: CCTV Surveillance Systems for use in Security Applications - Part 7
    • www.axis.com 1 m Pixels per Metre 250
    • www.axis.com 1 m 250 pixels Pixels per Metre 250
    • www.axis.com Pixels per Metre = 250 pix/m > 250 pix/m < 250 pix/m 250
    • www.axis.com HD Camera View Examples (1280 x 720 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Bird’s Eye View) Blind area Vertical View 250px/m 250px/m 125px/m 125px/m
    • www.axis.com 5MP Camera View Examples (2592 x 1944 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Bird’s Eye View) 250px/m 250px/m 125px/m 125px/m Blind area Vertical View
    • Pixel Density v Camera Resolution
    • www.axis.com You will always get a better pixel density from a higher resolution camera. True or False? It depends on the Field of View (FoV). If the FoV is the same, the higher resolution camera gives a better pixel density. If the FoV is different, a lower resolution camera may provide a better pixel density. Pixel Density v Camera Resolution
    • www.axis.com Resolution Comparison Resolution: HD1080p 118° Resolution: HD720p 80° 2m Scene width of 3.36m Scene width of 6.66m = 381 pix/m 1280 pixels 3.36m = 288 pix/m 1920 pixels 6.66m
    • www.axis.com Higher Resolution Increases Image Area (with Same Pixel Density) 5 Megapixel 3 Megapixel 1080p1080p
    • Bandwidth and Storage
    • www.axis.com RECEPTION SCHOOL YARD INTERSECTION STAIRWAY STATION RESOLUTION Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) Bandwidth (Mbps) 1 Day storage (GB) VGA 0.13 1.38 0.20 2.21 0.24 2.62 0.31 3.33 0.92 9.89 720p 0.38 4.13 0.61 6.62 0.73 7.86 0.93 10.00 2.75 29.70 1080p 0.86 9.29 1.38 14.90 1.64 17.70 2.08 22.50 6.18 66.70 3MP 1.31 14.10 2.09 22.60 2.49 26.80 3.16 34.10 9.37 101.00 5MP 2.04 22.00 3.27 35.30 3.88 41.90 4.94 53.40 14.60 158.00 Settings: 12 images per second, H.264, Image compression 30, Continuous recording Bandwidth & Storage Comparisons