Before the market sold almost all cameras feature automatic white balance function, can also be more complex default options, such as lights, fluorescent, daylight and a variety of modes manually control the white balance. Buy camera has good white balance function should be one of the issues to be considered. Of course, almost all of the image processing software can adjust the color of the image, but if your image software is not very familiar with, or do not want too much trouble to adjust, you'd better choose the camera has better white balance function. White balance, literally understood white balance. What is white? This involves some color science knowledge, white light is reflected into the eyes of the proportion of blue, green, red lights are the same and has formed a certain brightness visual response. We all know that white light is made up of red, orange, yellow, green, cyan, blue, purple seven shade, seven shade is a red, green, and blue mixed in different proportions to form, when a light the same proportion in the three primary color components, customary known as decoloring, black, white, gray, light reflected by the gold and silver are decoloring. The popular understanding white does not contain the brightness of the color composition. Inherent color of the human eye see white or other colors with the object itself, the color temperature of the light source, the object of reflection or transmission characteristics of the human visual sensor and many other factors (see "Principles of color"), give a simple examples of colored light shines on the achromatic objects, objects reflecting light color the same as the incident light color, both red light red white object, two or more colored light irradiation to the achromatic object, the object color is additive color effect, such as red and green at the same time illuminating white object, the object is yellow. When the colored light shines on the colored object, the color of the object was a subtractive effect. Such as yellow objects in the product red light red, green blue light irradiation, showing gray or black in blue light irradiation. Before understand the white balance is rebooted, and the other is a very important concept - color temperature. The so-called color temperature, in short, is to be quantitatively to the Kelvin temperature (K) to represent the color. Famous British physicist Kelvin assume that a blackbody material will fall on all the heat absorbed without loss, while all the energy generated by the heat release in the form of a "light" out, it will will become low due to heat in a different color. For example, when the heat on the blackbody equivalent to 500-550 degrees Celsius, it will become dark red, reach 1050-1150 degrees Celsius, it becomes yellow, the temperature continues to rise will appear blue. The color components of the light source heat suffered, and the blackbody temperature that corresponds to the color temperature of any light is equivalent to the the above blackbody emit the same color by the "temperature", this temperature is used to indicate the characteristics of a shade in order to distinguish the other, which is the color temperature. Blacksmith process, black iron in the furnace temperature gradually turns red, this is the best example of the black-body theory. Color temperature phenomenon is very common in everyday life, I believe it is no stranger to. Incandescent light emitted by the light in shades of yellow, different lights will be issued to the different colors of light, the flame of natural gas due to lower color temperature is blue, because of the higher color temperature. Cloudless blue sky the color temperature of about 10000K, cloudy approximately 7000 to 9000K color temperature of about 6000K sunny day under direct sunlight, sunrise or sunset when the color temperature of about 2000K a candlelight color temperature of approximately 1000K. At this time, we can easily find a pattern: The higher the temperature, the more bluish light color; reddish at the lower temperature. A shade higher than the other shade of the color temperature, bluish shade than other colored light, and vice versa reddish; Similarly, when the description of the shade a shade than other colored light bluish? _ Xuan T_ high color temperature Conversely low. Because the human eye has a unique adaptability, so that we sometimes can not find the color temperature changes. Such as incandescent light for a long time, and not feel the white paper under incandescent light reddish, suddenly fluorescent changed to tungsten lighting, you will feel found in White reddish color, but kinds of feeling can only be sustained for a while. The CCD of the camera does not like the human eye as adaptable, so if the color of the camera to adjust the color temperature of the lighting in the same scene inconsistency occurs cast. So what is white balance? White balance for different color temperature, taken out of the image by adjusting the camera's internal color circuit offset color cast, closer to the human visual habits. The white balance can be simply understood as a standard white color in any color temperature, captured by the camera lens through the adjustment of the circuit, so that after imaging is still white. This is often the case, but not all, the white balance is adjusted by the camera internal circuitry (changed to blue, green, red three CCD level balance between) so that the light reflected to the lens are presented for the elimination color. Reddish shade to adjust the white balance, then the image of the shade is achromatic and other color of the scene will be bluish (complementary colors). How to adjust white balance first camera at the white walls, white paper white target, and then automatically switch Switching from manual to set the location, date retained in that position for a few seconds to the image appear white in white balance is executed automatically switch back to the manual position to lock the white balance settings, white balance settings will remain in the memory of the camera, until they are changed, again, in the range of 2300 to 10000K During this period, even if the camera is powered down nor losing this setting. This way you set the white balance is suitable for most applications. (3) the value of the lens F What is the meaning of an F, whose value is the ratio of the focal length of the lens and the lens aperture: F = f (focal length) / D (real effective lens diameter), the smaller the F value, the aperture bigger. Example 6mm/F1.4 represents the maximum pore size of 4.29 mm. There are several ways you can see the video in three ways: 1. C / S (Client / Server) architecture: client software installed on the remote PC, each client software is independent of direct access to the front of the video server or network camera. As if the local personal version of the installed virus protection equipment, or manufacturers direct sales model. B / S (Browser / Server) architecture: no need to install any client software on the remote PC, just to have an IE browser, each Client Access server is set up at the specified location, by accessing the server images. As if locally installed anti-virus software client for the remote server. Or that the mode of sales agents. Brower: directly through IE access to the video server or network camera. As if you're a network virus protection online. Or that online sales model through the network. 5 What is PoE the PoE (PowerOverEthernet), through a special switching equipment powered directly through the network cable to the network device. This requires not only supported by the switch, but also need to network devices are also supported to normal use. Lens C-mount and CS interface difference Installation Classification lens camera lens is threaded port CCD camera lens has two industry-standard, C mount and CS-mount seat. Both the same as the threaded portion, but both the distance from the lens to the surface of the photosensitive type.