When choosing the right camera model is often guided by the possibility of adjustments to various operating conditions. Of course, more advanced models have more capabilities, simpler devices keep some parameters fixed.However, to take full advantage of the data set, refer to their action, the impact of the quality of the picture, what positive and negative. Such knowledge will help you achieve the best practical result of the camera.The impact of changes on the example of ACTi cameras, but they refer to other types of cameras from different manufacturers.Resolution
The basic parameter demonstrating the quality of the image is the resolution. It tells about how many points made up the whole picture. Obviously, the higher the resolution, the better the image quality, or a larger area monitored. In contrast, this entails also a greater demand for bandwidth and increases the volume of recorded material. Popular this CIF resolution (320 x 240), VGA (640 x 480), D1 (720 x 576), SXGA (1280 x 1024), UXGA (1600 x 1200), etc.Comparison of typical resolutionrate
Parameter talking about how many frames are transmitted per unit of time. The more the image is smoother. In a televised PAL is 25 frames per second, which is considered as an image without effect poklatkowości. However, in practice, the 25 frames, and only 5 to 10, which is due to less demand for bandwidth, and the lack of requirement for greater speed. Of course, in special cases need high speed, even at 100 frames per second, but such solutions are not popular. Reduced speed is used to control the crowd, higher (25) to control the behavior of individuals, the highest registration process szybkozmniennych (crahtest).
demonstrating the progress of the compression device. The better the compression, the lower the demand for bandwidth at the same subjective quality. The most popular types include the MJPEG, which combines consecutive images compressed JPEGiem, MPEG-4, which transmits full images at a few frames, complementing it with the same picture changes. The newest and most advanced type of compression is a new part of the MPEG-4 standard called H.264, which mainly applied in the coding of prediction images and image division into blocks of different sizes. In practice, reaches the edge (bandwidth, volume archive, the archive download time over the network) H.264 over MPEG-4 ASP of 30%.
Comparison of popular compression at a given quality video settings ACTi cameras menu’s Settings tab video (Video Settings). They contain settings related to network transmission of the video stream, such as the transmission type, resolution, frame rate, compression, bandwidth consumption, and serial port settings and network ports. Screenshot of video settings ACTi cameras Control Back Light Compensation (BLC)
Commonly occurring function is to control light mirror. It serves eliminating the resulting effect when the camera is directed towards a strong light source. The result is that the foreground is dark and unreadable. Back Light Control lets you lighten the image so that it is possible to identify the foreground. Unfortunately, at the expense of the background, which also becomes even brighter.
Wide Dynamic Range (WDR)
This is a feature introduced relatively recently, extending the action of BLC. It works on the basis of an analysis of the exposure of individual image points while helping lighten dark elements and darker elements too bright, so if you are working under the light you can see exactly both foreground and bright background.
White Balance (WB)
This is a reproduction of the camera all the colors relative to a reference white color. In automatic mode, the white to the lightest point of the image. Because the camera is often an area devoid of color, followed by all other misrepresentation. The solution is preset colors corresponding to artificial or natural light, as well as the ability to remember your settings “teaching” the camera looks like the color white.
White Balance correct
Automatic gain control (AGC)
This allows an increase in sensitivity, which allows you to work in darker conditions. However, keep in mind that along with the strengthening of the signal are amplified noise. So you can not increase this parameter to infinity. To properly set the AGC to be trial and error to come to optimum focus.
Auto Shutter (AES)
The possibility of lengthening the shutter speed allows you to extend the exposure time. This is a very useful feature in areas with limited exposure, because the longer exposure time results in a brighter image. However, it is not without its drawbacks. The problem with which you can meet a blur of moving parts of the image. This is due to the fact that the object moves significantly during the course of a frame, which is stored along its entire path. Another important limitation is the speed of the camera. Exposure time for obvious reasons can not be longer than the duration of the cage.
Compression based on the JPEG has a drawback, i.e. generate blocks in which there are side effects. This causes a strange “patterns in the image.” The effect is visible especially at night. The solution to reducing this problem is to change the focus. By reducing this parameter can be smoothed noise caused by compression. Of course, the large reduction will cause the image to be blurred.
These settings can be found in the tab settings of the camera (Camera Settings). This part of the menu with the parameters of visual or picture can be flipped horizontally or vertically, adjust the white balance, adjust the gain control, the maximum shutter speed, and focus.
Screenshot of settings ACTi cameras
Modern IP cameras offer many opportunities for working conditions. The mechanisms used in devices allow them to work in almost any environment. In this case, the quality of the resulting image depends only on the skill of the installer configuration. Please note that the manufacturer selects the parameters implicitly to the typical conditions of use of the model. The installer if he can under specific conditions can improve the picture quality. However, in many cases, those who install it happens so degrade the image that the camera they deem broken. Hence the conclusion that if the conditions of use are standard or lack of experience tuning process should be performed with great caution.