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Lecture 14 Topics on demand Digital cameras Security sensors.

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Presentation on theme: "Lecture 14 Topics on demand Digital cameras Security sensors."— Presentation transcript:

1 Lecture 14 Topics on demand Digital cameras Security sensors

2 Digital cameras Source: www.jiscdigitalmedia.ac.ukwww.jiscdigitalmedia.ac.uk video Lenses - video

3 Digital cameras Source: electronics.howstuffworks.comelectronics.howstuffworks.com video

4 4 of 17 Silicon image sensors silicone release electrons when exposed to light – photoelectric effect (mathematically described by Einstein in 1905), first observed by H. Herz in 1887 animationvideo

5 Chip structure Source: www.jaycar.com.auwww.jaycar.com.au video

6 Transfer from chip Source: www.astro.virginia.edu ; en.wikipedia.orgwww.astro.virginia.eduen.wikipedia.org

7 How to get color? Source: www.high-techdigital.com ; electronics.howstuffworks.comwww.high-techdigital.comelectronics.howstuffworks.com video

8 Actual chip structure Source: spiff.rit.eduspiff.rit.edu

9 9 of 17 CCD image sensor charge coupled device (CCD) invented by Bell Laboratories in 1970 Source: astronomyonline.orgastronomyonline.org A CCD image sensor (1024x1024) video

10 10 of 17 CMOS image sensor complementary metal oxide semiconductor (CMOS) Source: electronics.howstuffworks.comelectronics.howstuffworks.com A CMOS image sensor video

11 CMOS vs. CCD CCD Low noise High price (requires a special manufacturing process) High resolution Higher image quality video CMOS Lower power consumption Low price High noise

12 Problems Blooming (pixel stores too many electrons, they can spill over resulting in a grossly over-exposed image) Source: astronomyonline.orgastronomyonline.org

13 Security sensors Smoke detector Finger print sensor PIR (passive infrared) – movement detection

14 Smoke sensor optical Ionization Source: extension.missouri.edu ; www.connectmidmissouri.comextension.missouri.eduwww.connectmidmissouri.com video

15 Fingerprint sensor Source: www.ehow.com ; www.ehow.comwww.ehow.com gkall.hobby.nlgkall.hobby.nl ; www.directindustry.comwww.directindustry.com

16 Fingerprint sensor Capacitive sensing Source: computer.howstuffworks.comcomputer.howstuffworks.com Optical – video – with Arduino Fingerprint recognition video

17 PIR (passive infrared) – movement detection Source: www.ladyada.netwww.ladyada.net

18 Fresnel lens PIR (passive infrared) – movement detection Source: www.ladyada.netwww.ladyada.net

19 PIR (passive infrared) – movement detection Source: www.jablotron.czwww.jablotron.cz video Long and detailed teadown

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