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4. Input Devices: Cameras

Digital cameras are becoming increasing popular as they become cheaper and photo sharing web sites become common.


1. Digital Still Cameras

Still Camera

4 in Kickin Technology Series: Digital Still Cameras. So common they are included in phones.

a. How They Work.

  1. A digital camera takes a photograph by using sensors to capture the light that comes in through the lens.
  2. It then converts the light into binary numbers that are recorded on backing storage.
  3. This digital version of the photograph can then be displayed on the small screen that is set into the camera.
  4. A digital camera also has software that lets you delete unwanted photos while they are still stored in the camera.
  5. You can connect your camera to your PC and transfer your photos across.
  6. Once they are in the PC you can edit your photos further by using a good graphics package.


b. Advantages of a digital camera

  1. It can hold lots of photos without the need to buy film.
  2. You can see what your photo is like straight away and you can delete any you do not want.
  3. The photos are digital so you can transfer them to your PC and then do all sorts of things with them such as edit, print, store on a writable CD, attach to an e-mail.
  4. You do not need to have photos developed, saving time and money.


c. Buying a Camera? The key features to look for.

  1. The number of megapixels the camera has.
    A megapixel is a million pixels. This is a measure of how accurately the camera captures images. It refers to the number of sensors the camera uses to detect the light. The more pixels, the better the quality of pictures the camera can take.
  2. The amount of onboard memory the camera has.
  3. The larger the onboard memory the more photos it can store. Camera memory sticks come in various sizes.



2. Digital Video Cameras



a. How it works

A digital video camera captures moving images using technology similar to that used by a still digital camera.

  1. It uses light sensors to capture the images.
  2. The images are then changed into binary numbers.
  3. The binary numbers are then stored in files on the camera’s backing storage



2 in Kickin Technology Series: Digital Video Camera. Getting much much smaller and can be seen on a lot of phones!

b. Key features of a video camera?

The accuracy of the image sensors used to take the film. This is measured by
the number of pixels that the camera uses to capture the images.




3. Web Camera

This is a digital camera that is used to take photos and then send them across the internet. Webcams capture and transmit still photographs that can be updated at various speeds, from one frame every few minutes, to full streaming video, depending on the speed of the computer system and the software settings.

track pad


3 in Kickin Technology Series: Web Cameras. Almost every laptop and desktop has one!

The technology for capturing the images is similar to that used in the other digital cameras. The difference is that once an image is captured it is transmitted automatically to a computer system. Webcam software in the computer system then transfers it to a web page.

Web Cams are used for:-




What you have to do!

Watch the videos above and in your Word document or your Brain complete the following exercises.

1. How does a digital still camera work?

2. List four advantages of digital cameras.

3. In what way is a digital video camera the same as a digital still camera?

4. How does a webcam operate?

5. How does the storage capacity of a digital video camera different from that of a digital stills camera?



What you should be able to do!

  1. Explain the advantages of using digital cameras.

  2. Describe how they work.

  3. Provide examples of where you would use each type of digital camera..


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