Solved

digital cameras

Posted on 1998-05-30
5
183 Views
Last Modified: 2010-04-27
I am looking for a good explanation on how digital cmaeras work. I would like it to be as technical and detailed as possibe. Perferably the explanation should be on the net, but if anyone has a paper on it I would be more than happy to recieve a copy.
0
Comment
Question by:pelegs
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
5 Comments
 
LVL 32

Expert Comment

by:jhance
ID: 1135694
I've not seen any writeup on the net but digital cameras are actually quite simple in both conecpt and operation.  They are all based on a device called a CCD.  CCD stands for "charge coupled device".  A CCD is an electronic part not unlike a RAM chip you might find in your PC.  Unlike RAM, however, a CCD is wired up internally so that the memory cells make up a long chain with each cell feeding the next one.  In engineering terms, this is called a shift-register.  As you clock the device, each data bit shifts into the next one and the one on the "end" comes out of the device.  Another interesting characteristic of memory cells is that they are light sensitive.  As I shine light of different color and intensity on a charged memory cell, a portion of the charge will leak off.  In normal memory, this is very undesirable and so RAMs are packaged in light-proof packages so that this doesn't happen.  With a CCD, however, this is what we want.  They make the CCD in a package with a lens over the top of the chip so that as light enters the camera, it falls squarely on the CCD.  Each bit in the CCD becomes one pixel of the finished image.  After the proper exposure, the bits are shifted out of the camera and a data processing circuit in the camera maps each charge level from the CCD to a specific color and intensity for an image.  Now we have (internally) a fully digital image that is stored in a memory device (usually a RAM or FlashMemory) in the camera.  There is only a limited amount of space to store images in the camera, this is why you can only take a few pictures before deleting some or tranferring them out of the camera to your PC.
0
 
LVL 32

Expert Comment

by:jhance
ID: 1135695
I've not seen any writeup on the net but digital cameras are actually quite simple in both conecpt and operation.  They are all based on a device called a CCD.  CCD stands for "charge coupled device".  A CCD is an electronic part not unlike a RAM chip you might find in your PC.  Unlike RAM, however, a CCD is wired up internally so that the memory cells make up a long chain with each cell feeding the next one.  In engineering terms, this is called a shift-register.  As you clock the device, each data bit shifts into the next one and the one on the "end" comes out of the device.  Another interesting characteristic of memory cells is that they are light sensitive.  As I shine light of different color and intensity on a charged memory cell, a portion of the charge will leak off.  In normal memory, this is very undesirable and so RAMs are packaged in light-proof packages so that this doesn't happen.  With a CCD, however, this is what we want.  They make the CCD in a package with a lens over the top of the chip so that as light enters the camera, it falls squarely on the CCD.  Each bit in the CCD becomes one pixel of the finished image.  After the proper exposure, the bits are shifted out of the camera and a data processing circuit in the camera maps each charge level from the CCD to a specific color and intensity for an image.  Now we have (internally) a fully digital image that is stored in a memory device (usually a RAM or FlashMemory) in the camera.  There is only a limited amount of space to store images in the camera, this is why you can only take a few pictures before deleting some or tranferring them out of the camera to your PC.
0
 
LVL 32

Expert Comment

by:jhance
ID: 1135696
Is there some part of the above answer that you don't understand?  It's common practice to explain why you reject an answer.
0
 

Author Comment

by:pelegs
ID: 1135697
I need very technical information regarding digital cameras
0
 
LVL 32

Accepted Solution

by:
jhance earned 50 total points
ID: 1135698
"Very technical" is a relative term.  Define "very technical".
0

Featured Post

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

this article is a guided solution for most of the common server issues in server hardware tasks we are facing in our routine job works. the topics in the following article covered are, 1) dell hardware raidlevel (Perc) 2) adding HDD 3) how t…
Stuck in voice control mode on your Amazon Firestick?  Here is how to turn it off!!!
This video teaches viewers how to process images for a time-lapse video. Programs required: Adobe Lightroom, Adobe After Effects, Video Editing Program. In Adobe Lightroom: Import sequence image files into Adobe Lightroom: Develop settings of an I…
Come and listen to Percona CEO Peter Zaitsev discuss what’s new in Percona open source software, including Percona Server for MySQL (https://www.percona.com/software/mysql-database/percona-server) and MongoDB (https://www.percona.com/software/mongo-…

728 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question