The all-in-one camera now refers to a camera with integrated optical zoom and auto focus lens. Compared with the gun machine, the precision and technology of the integrated movement is much higher. The one-piece movement in the era of analog monitoring is monopolized by Japanese and Korean companies (such as Samsung, Hitachi, Sony, etc.).
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In recent years, with the development of IP high-definition technology, a small number of R&D companies in China have mastered the core technologies of high-definition integrated machine movements, such as Ai Pu Da Da, Hikvision, Zhejiang Dahua, Onyx and Digital China. . Due to the high precision requirements of the integrated machine technology and high development and production costs, the price of the HD network integrated machine on the market is currently too expensive. High-definition all-in-one products are mostly used in safe cities, road monitoring, airports, plazas and other places.
Compared with traditional gun-type cameras, the integrated camera is compact, beautiful and easy to install. At the same time, the HD network all-in-one can realize zooming, focusing and iris control through the network, and it is almost unnecessary to go to the site for post-maintenance in one installation. In addition, the high-definition network integrated camera has higher definition and wider monitoring range, and does not require an optional high-definition lens.
Compared with ordinary models such as guns, the features of the integrated camera are mainly reflected in the auto focus, which keeps the image picture clear at any time. So, what is auto focus? In short, auto focus is to detect the position of the main object surface of the image by the camera auto focus algorithm, and automatically adjust the focus motor of the lens according to its focus on the camera image sensor, so that the zoom control can be realized by reciprocating multiple times. Auto focus all the way, the image remains clear at any time during zooming. As a result, the era of traditional gun focus and manual focus maintenance is gone.
Zoom control and auto focus technology improve monitoring efficiency. When the image screen changes (such as when there is object movement or zoom control), it needs to be refocused. The auto focus lens can automatically perform the focusing operation, so that the entire image is always in focus and the image is clear. For example, if we control the zoom of the lens so that the characters in the scene are far and near, the autofocus algorithm will continuously analyze the current picture and issue a lens auto focus command, so that the characters will always keep the focus clear in the picture. And if the integrated camera is installed on the gimbal, the auto focus can also be completed according to the operation of the gimbal. The main technical difficulty of autofocus is to improve the speed and accuracy of focusing, which will affect the results of post-image processing. The distance between the subject and the shooting time in the scene changes, and fast focusing is necessary. The improvement of the focusing speed depends on the selection of the focus evaluation function.
The focus evaluation function is used to measure whether the image is focused or not. The types of focus evaluation functions commonly used in image processing-based autofocus algorithms are: gray gradient functions, informatics functions, frequency domain functions, statistical functions, and so on. The image is subjected to gradient transformation by calculus method, and the edge enhancement of the image is processed to make the evaluation function values ​​of the focused image and the out-of-focus image more distinct, and the sensitivity of accurate focusing is improved. This method is currently used by security integrated cameras.
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