VideoLabs FlexCam iCam Technical Information download pdf (Page 17)

Table 16.4 Equipment needed for image capture and display

Camera with analogue (video) output Camera with digital output

Used for video display Used via a computer Used via a computer

Equipment

Camera. eg, flexcam, video camera

Analogue lead.

Camera.

Either a video-capture card must be

installed in the computer or an external

capture device (eg, USB grabber) is

required.

Lead to connect the camera to the

computer or external capture device.

Digital camera.

USB (or other digital) lead.

TV, VCR, computer monitor or data

projector will be required to display

the images.

Both systems will also require the following to process and display the

images.

Digital device with an input socket compatible with the output from the

camera or external capture device to capture the image (computer /

DVD player or recorder).

Lead(s) to connect the camera and digital device.

Compatible software to process the signal.

Means to display the image (computer monitor, TFT screen, data

projector or interactive whiteboard).

Advantages and disadvantages

The correct connectors must either

be provided or available via adaptors.

See section 16.6.4 and Table 16.6.

Care must be taken to ensure that all

the equipment is mutually compatible.

See section 16.6.4 and Table 16.6.

The camera can be connected

directly to the computer or digital

display device.

The simplest choice for direct

viewing.

The option to display (possibly larger

and clearer) images via a large screen

(see Resolution, frame rate and other

factors below).

Obviously the simplest choice if

digital images are desired, though

display size and quality might be

limited (see Resolution, frame rate

and other factors below).

Using a digital device or converting analogue outputs, once an image is available

in electronic form, it can be saved for future use (either as a still or moving pict-

ure), incorporated in electronic or paper documents and transferred by e-mail.

Image-processing software may also be used to manipulate the image.

It is important to check the computer hardware and software requirements and

compatibility. Some cameras can only work with certain operating systems. If

your computers are more than 3-4 years old, they may not match this required

specification and you will be limited to choosing a camera with video connection.

Not all digital cameras are Mac-compatible.

Digital display

and software

Problems with software are the greatest barrier to using digital-image capture.

There can be difficulties with installation and, even once these have been mast-

ered, not all software is easy to use.

The sequence in which each step is performed is critical. Read the inst-

ructions and follow them closely. Unless directed otherwise, the camera

should NOT be connected to the computer before the software is loaded;

it should be attached after the software is installed but before the driver

is installed. After installation, the computer should be restarted and the

camera reattached to ensure that installation has been successful.

It is also worth noting that colour rendition and apparent sharpness are affected,

not only by the optical quality of a camera but also by the quality of the software

used to process the images. Files containing image information are usually comp-

ressed to allow them to be handled and stored quickly and efficiently. Compress-

ion software varies in quality, setting a limit on colour rendition, contrast and

apparent sharpness. It is often what distinguishes a ‘good’ camera from the mere-

ly ‘average’. See also the information in Frame rate below.

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