Lecture 9 Digital Camera. ECE 197SA Systems Appreciation. Lab Assignment
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1 Lecture 9 Digital Camera ECE 197SA Systems Appreciation Lab Assignment Build half-adder from logic gates Basic function of calculator (all operations use your gates!) Embedded system checks correct implementation Manual calculation Automated test What you need to do: Pick up kit in Knowles 211C (available later this week) Do lab (instructions provided) Take picture of you and working system Submit picture on Moodle Tilman Wolf 2 1
2 Digital Camera Digital imaging technology Capturing visual information in digital systems Today s lecture: Charge-coupled device» Sensor for light Digital camera» Storage, user interface to sensor, etc Tilman Wolf 3 Importance of Images Why is a picture worth a thousand words? Tilman Wolf 4 2
3 Importance of Images Sight is an important human sense Color and brightness Sight important for perception of environment 2-D image used for object recognition and interpretation Depth perception derived from using both eyes Tilman Wolf 5 Images as Rays of Light Projection of light from object onto screen Convex lens gathers light from object Screen can be retina, image sensor, cinema screen, etc. Need to capture light and represent in electronic domain Tilman Wolf 6 3
4 Human eye Lens project image onto retina Photoreceptors in retina translate light into nerve impulses Sensor types» Rod (brightness)» Cone (color) Sensing Light Electronic sensor Light becomes charge in chip» Same idea as solar cell Readout» Charge amplifier (charge-tovoltage converter)» Sampled, digitized, stored From From Tilman Wolf 7 2-D Image sensor How to extend sensor to capture 2-D image? Tilman Wolf 8 4
5 Charge-coupled device (CCD) Sensor to capture light Clever design to move charges of pixels to amplifier Inventors received 2009 Nobel prize in physics CCD Sensor Tilman Wolf 9 CCD Design Need 2-D design that can be put on CMOS chip 2-D array of light sensors 2-phase operation: exposure and readout Readout:» move charge from each pixel sequentially to edge» Measure charge at edge/corner of chip From Tilman Wolf 10 5
6 Moving charge: CCD Design Tilman Wolf 11 CCD Operation 2-D operation to move charge to corner of chip Single amplifier/a-to-d converter From Tilman Wolf 12 6
7 Colors Separate light by different colors Bayer filter Single CCD sensor Different pixels sense different colors 3CCD separates colors Tricroic prism assembly One CCD sensors per color Tilman Wolf 13 RGB Decomposition Intensity of red, green, and blue channel: original red green blue Tilman Wolf 14 7
8 Color Spaces RGB is not the only color space Example: YCbCr» Luma (Y)» Blue-difference chroma (Cb)» Red-difference chroma (CR) Linear transformation between spaces From wikipedia.com Tilman Wolf 15 Image Sensor Uses Photographic cameras Scientific application: CCD» CCD uses specialized fabrication process for light capture Consumer cameras: CMOS imager» CMOS imager has charge-to-voltage conversion per pixel Different sensor sizes Video cameras Astronomic telescope Large arrays of CCDs Microscopes Tilman Wolf 16 8
9 Interesting Uses of Image Sensors Lensless cellular imaging (Prof. Salthouse, ECE) Because the pixels of modern imagers are even smaller than cells, blood samples can be analyzed by flowing the sample directly on top of the imager without a microscope. white blood cells labeled with quantum dots Tilman Wolf 17 Digital Camera Camera contains optics and electronics Optics project image onto sensor Electronics read and process sensor information Tilman Wolf 18 9
10 Digital Camera Operation Camera opens shutter to expose sensor to light Choice: longer or shorter time of open shutter (exposure) Choice: wider or smaller opening of shutter (aperture) Choice: more or less sensitive readout of sensor (ISO) Readout: conversion into image file Image file contains light intensity measurements Tradeoffs: contrast, depth of field, etc. From mishes.com From photographywisdom.com Tilman Wolf 19 Courses in ECE Curriculum ECE 344 Semiconductor Devices & Materials ECE 572 Optoelectronics ECE 597BE Bioelectronics Tilman Wolf 20 10
11 Next week: Internet Network protocols Moodle quiz Upcoming Tilman Wolf 21 11
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