Axis 2400+ Bedienungsanleitung PDF herunterladen (Seite 32)

Conversion examples

The table below shows the approximate number of

horizontal lines for different image resolutions:

512x492 pixel = 330 Horizontal TV lines

512x582 pixel = 330 Horizontal TV lines

640x480 pixel = 400 Horizontal TV lines

768x492 pixel = 470 Horizontal TV lines

768x582 pixel = 470 Horizontal TV lines

1280x960 pixel = 800 Horizontal TV lines

When using digital images it is possible to select the

desired image quality. Remember, the higher the quality

of the images, the greater the amount of data. And

images containing a lot of data take longer to transmit

and take up more space on a computer hard disk.

With the exception of scientiﬁ c applications, images

are always compressed to reduce the amount of data.

As a rule of thumb, you can usually reduce the amount

of data by a factor of 10 without any reduction in the

quality of the image.

The amount of data in an image -

some basic principles

• Large images require more data than small images

• Highly compressed images require less data than

images using low compression

NB. The higher the compression, the more blurred the

images.

• Scenes with a lot of detail generate more data than

scenes with little detail. For example: an image of

a colorful tree will generate signiﬁ cantly more data

than an image of a plain-colored wall

Resolution

The resolution of analog cameras is often measured in horizontal

TV lines. The resolution of digital cameras is measured in pixels on

the sensor (the CCD chip).

Examples of JPEG images with varying levels of detail. The branches of trees consist of a large amount of detail, which generate a large amount of data.

Not very detailed, ﬁ le size 20 kB.

Very detailed, ﬁ le size 50 kB.

I MAGE QUALITY

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