Hi-view Hi-795 Руководство по эксплуатации - Страница 14

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Камера безопасности Hi-view Hi-795. Hi-view Hi-795 15 страниц. Ir dome camera

Chapter 3 Typical CCD Phenomena

The following effects on the monitor screen are characteristic of

CCD cameras.

They do not indicate any fault with the camera.

Smear

This occurs when shooting a very bright object such as electric

lighting, the sun, or a strong reflection. This phenomenon is caused

by an electric charge induced by infrared radiation deep in the

photosensor. It appears as a vertical smear, since the CCD imaging

element uses an interline transfer system.

Vertical aliasing

When you shoot vertical stripes or lines, they may appear jagged.

Blemishes

A CCD image sensor consists of an array of individual sensor

elements (Pixels), A malfunctioning sensor element will cause a

single pixel blemish in the picture. (This is generally not a problem.)

White speckles

While CCD image pickup device is made by an accurate technique,

imperceptible speckles may rarely come up on the screen due to

cosmic rays and so on. This is connected to the principle of CCD

mage pickup device, not a malfunction. And the white speckles are

easy to come up in the following conditions.

Using the camera in high temperature

When turning up the gain

Blooming

This is a phenomenon is which the light from very bright objects

appears to overflow into neighboring areas in an image.

Note

If strong light enters a wide area of the screen, the screen may

become dark. This is not a malfunction. If this occurs, avoid strong

light or adjust the lens iris to reduce the light amount.