1. What should we do when met a whiten image?

2. What should we do when met a color cast image?

3. How to choose the best lens?

4. How to calculate the focal length?

5. What are the common video transmission modes and what are their transferring distances?

6. The visual effect of IR camera is bright in the center and shade on the around or not?

7. When the high speed dome camera out of control, how to solve it?

8. What cause the IP camera can not give out images?

9. What cause image blurring?

10. In the Pure Internet Access, we can not use IP address or domain name to access a DVR, then what can we do to solve it?

 

 

1.       What should we do when a camera can not output images?

Answer: At first, we should make sure whether it linked to the power, regularly we can estimate from the power light.

Then, we should confirm the invigilator is working. For example, affirm it turned to the corresponding input access.

Thirdly, whether the coaxial-cable is normally touched. Fourthly, whether opened the lens iris. If it is not the above problems, the camera may need to be repaired.

Answer: First, we should check whether the lens direct at high light. If our lens is manual iris lens, check the lens is opened too large. If our lens is auto iris lens, check adjusted value is too low or not, it can made the lens is opened much large. Second, inspect the exposure setting is right or wrong, electronic shutter speed is far slow or not. If it is not the above problems, the camera may need to be repaired.

 

Answer: Generally, we use white balance to change the color cast. White balance settings have two types.

 Or the way of pressing a button, First, we should make the lens aim at white paper or white wall. Then, press the auto mode switch to setting place and stay at here for several seconds or until the image become white. After the white balance operated, we should push the auto mode switch back to manual control point in order to lock the position   of white balance. After that, this setting will be kept in camera’s memory until we change it. Its range is 2300 to 10000k. During this period, this setting will not be changed even the camera out of power. Using the way of pressing a button to set white balance is the most helpful and exact and it adapt to majority needing places.

 Type two: Manual white balance. When we open the manual white balance, the auto white balance will be closed.

This way, we can find about 107 choices which we can use to change red and blue color. Such as we can gain or decrease one grade of red or blue. Beside that, some cameras also have such orders like setting the auto white balance to stay with 3200k and 5500k. （3200k is a level of filament lamp）

 

 

4.       How to choose the best lens?

Answer: 1. A lens’s imagery size should agree with target size of a camera’s CCD. The size of a camera’s CCD has three types: 1/2 inches ply, 1/3 inches ply and 1/4 inches ply.

1.       Focal length of Lens and view angles. First we are according to the distance of camera and target to choose the suitable focal length. Then, the view angle chosen by target size.

2.       Chosen a diaphragm or luminous fluxes depend on the ratio of focal length and clear aperture. We use F to refer it. Each focal length has its maximum value. The luminous flux opposite of F’s square. The smaller F, the larger diaphragm. So using an auto iris lens or a manual iris lens should depend on the changing of ray of light.