Low-Cost Image Capture System for Computer Interfacing

Click For Summary

Discussion Overview

The discussion revolves around finding a low-cost image capture system that can interface with a computer, focusing on alternatives to traditional scanners. Participants explore various options, including web cameras and digital cameras, while considering factors such as resolution, lighting, and the nature of the objects being captured.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant suggests that a web camera might be a feasible option but expresses concerns about resolution, noting that many available models are under three megapixels.
  • Another participant asks for specific requirements, such as the necessary pixel count, lighting conditions, and whether the object is moving or fixed, indicating that these factors significantly influence the choice of camera.
  • A participant mentions that digital compact cameras offer good image quality for the price and references hacks for controlling them from a computer.
  • Some participants discuss the possibility of using a webcam for still images, highlighting the immediate saving of images on a hard drive and the lack of battery concerns.
  • Calibration of the webcam is brought up as a potential requirement due to the poor quality of lenses, with one participant questioning what specific calibration could be done.
  • There is a suggestion to consider mating a webcam with an SLR lens if the webcam's lens is inadequate, prompting curiosity about the feasibility and potential benefits of this approach.

Areas of Agreement / Disagreement

Participants express varying opinions on the suitability of web cameras versus digital cameras, with some favoring compact or SLR cameras for better quality while others advocate for the convenience of webcams. The discussion remains unresolved regarding the best approach to achieve the desired image quality within a low budget.

Contextual Notes

Participants have not reached a consensus on the necessary pixel count or the specific calibration methods for webcams. The discussion also reflects uncertainty about the capabilities of low-resolution cameras in capturing fine details.

Who May Find This Useful

This discussion may be useful for individuals seeking low-cost imaging solutions for computer interfacing, particularly in engineering or hobbyist contexts where budget constraints are a concern.

dmehling
Messages
114
Reaction score
0
I know this may not be the right place to post this question, but I figured some of you engineering folks might have some suggestions. I am looking for a way of capturing images through a device that easily interfaces with a computer. Scanners are out of the question for my application for several reasons. The best I can come up with is a web camera, but most that are available are lacking in necessary resolution. A digital camera is doable but more complicated since only the higher end cameras have software available to capture images from a PC. I am needing a low cost solution. Any suggestions?
 
Engineering news on Phys.org
How many pixels do you need
How much light do you have available
Is the object moving, how fast do you have to take the picture
What range, how fancy a lens do you need?
Is the object fixed, do you need autofocus?

You get an awful lot of image quality for your money from regular digital compact cameras
A lot of people have done hacks to control them from computers eg. http://www.camerahacker.com/books/Hacking_Digital_Cameras/ or http://chdk.wikia.com/wiki/CHDK
 
Last edited by a moderator:
The image will be still and fixed, and will be approximately 10 to 14 inches away. As far as lighting goes, I can probably provide as much as I need. I'm not sure how many pixels I need. The more the better. However I will probably be stuck using a web camera, and most are under three megapixels. I'm basically trying to capture fine details at fairly close range. What I am trying to accomplish might just come down to figuring out how to get the best image quality with a less than ideal camera.
 
If you need megapixel moving images then a webcam is probably the cheapest - but the lenses are poor so you might have to do a lot of calibration.

If you can settle for a single shot then either a compact or SLR digital camera would be best value. There are a number of official or hack ways of remote controlling the camera and downloading the data.
 
I will only be capturing still images, but I plan on sticking with a web cam since I can have captured images immediately saved on the hard drive and don't have to worry about batteries. An SLR camera is way out of my price range. I wouldn't have any problems with this project if I had a decent budget. I'm curious about what you mean by calibration. What calibration can I make with a web camera?
 
mgb_phys said:
If you need megapixel moving images then a webcam is probably the cheapest - but the lenses are poor so you might have to do a lot of calibration.
You may also consider mating a webcam to an SLR lens if the webcam lens proves insufficient...
 
That sounds rather interesting. How would I do such a thing? And what exactly will that accomplish? Is it actually possible to get decent images with a 1.3 megapixel camera? I would love to hear about any other simple enhancements you can suggest.
 

Similar threads

  • · Replies 0 ·
Replies
0
Views
352
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
3
Views
2K
  • · Replies 36 ·
2
Replies
36
Views
5K
  • · Replies 102 ·
4
Replies
102
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 40 ·
2
Replies
40
Views
6K
  • · Replies 3 ·
Replies
3
Views
5K