Axis 2400+ Manual do Utilizador descarregar pdf (Página 23)

The quality of the computer displaying the images is

always important. It should be conﬁ gured to display at

least 16 bits color.

Here are some simple tips for capturing good images.

Use lots of light

The most common reason for poor quality images is a

lack of light. Generally, the more light, the better the

images. With too little light, the images will become

blurred and dull in color. Professional photographers

always use strong lamps.

Lux is the standard unit for measurement for light.

The table shows how much light you can get in different

kinds of conditions.

At least 200 Lux is needed to capture good quality

images. A high-quality camera might be speciﬁ ed to

work down to 1 Lux. This means you can capture an

image at 1 Lux; not that you will get a good image at

1 Lux. Different manufacturers use different references

when they specify the light sensitivity, which makes it

hard to compare cameras without looking at captured

images.

Avoid back light

Try to avoid bright areas in the images. Bright images

might become over-exposed (bright white) and objects can

then appear too dark. This problem typically occurs when

attempting to capture an object in front of a window.

Reduce the contrast

A camera adjusts the exposure to obtain an average

level of light in the image. When trying to capture an

image of a person standing in front of a white wall, the

person generally tends to appear too dark. This problem

is easily solved by substituting the background color for

gray instead of white.

Capturing images

There are some basic rules that apply if you want to obtain high-quality

images from a camera. These rules are equally applicable to network cameras

as they are to any other type of camera.

Advanced cameras include the feature to compensate

for back light.

Environment Lux

Strong sunlight 100,000

Full daylight 10,000

Normal ofﬁ ce light 500

Poorly lit room 100

Avoid very bright areas in an image by changing the

camera position.

C AMERA BASICS

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 51 52

Comentários a estes Manuais

Sem comentários

Axis 2400+ Manual do Utilizador Página 23

Comentários a estes Manuais

Manuais e produtos relacionados com Redes Axis 2400+