1. www.axis.com Network Video Image Usability David Thomasson Business Development Manager - Transportation
2. 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
3. From Analogue to Network Video
4. www.axis.com Detection Prioritization Response Investigation Security Incidents The Challenges
5. 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
9. 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 someones identity beyond reasonable doubt.
10. 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%
11. 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%
12. 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%
13. 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
14. www.axis.com 1 m Pixels per Metre 250
15. www.axis.com 1 m 250 pixels Pixels per Metre 250
16. www.axis.com Pixels per Metre = 250 pix/m > 250 pix/m < 250 pix/m 250
17. www.axis.com HD Camera View Examples (1280 x 720 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Birds Eye View) Blind area Vertical View 250px/m 250px/m 125px/m 125px/m
18. www.axis.com 5MP Camera View Examples (2592 x 1944 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Birds Eye View) 250px/m 250px/m 125px/m 125px/m Blind area Vertical View
19. Pixel Density v Camera Resolution
20. 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
21. 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
22. www.axis.com Higher Resolution Increases Image Area (with Same Pixel Density) 5 Megapixel 3 Megapixel 1080p1080p
25. 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
26. www.axis.com 1 m Pixels per Metre 250
27. www.axis.com 1 m 250 pixels Pixels per Metre 250
28. www.axis.com Pixels per Metre = 250 pix/m > 250 pix/m < 250 pix/m 250
29. www.axis.com HD Camera View Examples (1280 x 720 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Birds Eye View) Blind area Vertical View 250px/m 250px/m 125px/m 125px/m
30. www.axis.com 5MP Camera View Examples (2592 x 1944 pixels, 3 - 9mm Lens) 1080p1080p Horizontal View (Birds Eye View) 250px/m 250px/m 125px/m 125px/m Blind area Vertical View
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