Auto-Focus is for what?
Ⅰ.What is special of our "Auto-Focus" camera?
Bouth photoelectric auto-focus camera is a global invention patent product, which is different from the traditional one camera because of the fixed photosensitive chip, We do this precisely by moving the photosensitive chip and here are the benefits:
1. It can change the working distance. The working distance of traditional industrial lens is fixed. For example, the most common single-cylinder microscope with a specification of 0.7-5X and which generally has a working distance of 100 mm. If our photoelectric auto-focus camera is adopted,not only realizes automatically focusing, but also has a working distance of 50 mm-150 mm. This work piece in the detection of height difference is a great convenience, do not need to adjust the focus hand wheel.
2.It does not need to be corrected after the focus, to ensure that the focal length. The concept of focal length is that the focus remains the same after the multiplier changes, and the image is always clear during the whole zoom process. This is always a problem with variable magnification microscopes. First, the processing and assembly accuracy of the microscope is required to be relatively high. In addition, when matching the camera, there will be a problem of rear-focus correction that is the need for a regulatory mechanism to ensure that the camera's sensitive surface is right on the lens focal plane. However,many users still do not know how to correct the focus, caused a lot of trouble for customers to use similar products. This question is gone if the automatic focusing camera of our photoelectric is used because of putting the microscope at a working distance and turning on "auto-focus" function, the camera will automatically move the sensitive surface to the focal plane of the lens, which we do by moving the sensitive chip. Even if you're using a super bad lens, there's no guarantee of zoom, and don't worry, there's auto focus, which will help you to solve all problems.
Ⅱ.The evaluation of focusing algorithm
On the market, there are a large number of companies that claim to be able to develop & manufacture Auto-focus cameras but few of them have the real strength of producing it. Well, Let's talk about those companies that actually have the ability to develop their own algorithms,making a comment on the auto-focus of these products. The following aspects should be taken into consideration in the evaluation:1. Speed. It's not absolute, the high speed doesn't mean the good quality. As the saying goes, to be both fast and good is really good. Only pursuit of the high speed but ignore the user's feelings is not fitting on customers' demand and which is not our target too.For example, you run fast but breath difficult, do you think it's good? The speed is also related to the motor, like the liquid lens, voice coil motor and the stepping motor, which are not of the same order of magnitude, the latter is much slower, it moves forward step by step like a snail, while the liquid lens and voice coil motor are like a bullet train, and they are direct. Why not choose liquid lens or voice coil motor? Please compare the price of snail and bullet train. Even if the stepper motor is used, it also depends on the distance, run 100 meters and run 1000m, you run faster than the estimated run 100m than run a kilometer to get there. Ok, even if the target distance is 1000m, running is different from racing walking. Stepper motor has a stepping accuracy problem. In a word, in the case of large-scale focus of industrial cameras,Buoth Industry photoelectric auto-focus technology is the world's leading.
2. Accuracy. No one can guarantee 100% focus accuracy, even if it is active focus (ranging), and passive focus is based on high frequency signals to implement, you have to have the edge, like glass, walls, smooth surface, that is the gods can not do. But you mustn't miss it 100%. For the most part, focus quickly and accurately. The focusing light condition is highly dependent. In low light conditions, focusing becomes particularly difficult due to noise interference. A good focusing algorithm is to ensure that effective signals can be obtained under weak signals and accurate focusing under extremely bad conditions,Buoth photoelectric is so cattle!
3. No overshoot. Or the phenomenon of breathing, which is focusing without going back and forth, back and forth, mincing. One step at a time, if god help. Poor focusing algorithm will find a clear point, and then repeatedly confirm near the focus, forming a multiple focus. It feels silly, unintelligent and uncomfortable. The whole focusing process is from fuzzy to clear, to fuzzy, to more clear and more fuzzy to clear, which is a process of repeated confirmation. And some focus in the process of starting can not find the north, is clearly away from the focus, but also a strong run, there is not against the south wall not look back. Buoth photoelectric through years of technical accumulation, in these details do comparable to the international first-class company.
Intelligence. In general, the auto focus mode is af-c, that is, the continuous auto focus mode. The answer is NO, don't worry, I pinched fingers to calculate, the image is not clear, is clear, take a rest (do nothing), not clear, I refocus, is not very smart? If it is a zoom camera, the intelligence is also reflected in the zoom tracking, which is a new technology breakthrough in recent years, is the program will automatically adjust the focal surface according to the change in the focal length, so that the image is always clear during the zoom process, just like the focal length in the zoom microscope. Isn't that smart?
Ⅲ.Auto-focus several modes of understanding
Buoth photoelectric auto-focus camera has three modes, of course, others are also the three modes, not the invention of Buoth photoelectric. The main thing to say here is, why are there three models, and how do you use them?1. Manual mode (MF) Why do you have a manual mode when you have an auto-focus camera? As mentioned above, automatic focusing camera cannot guarantee 100% accurate focusing, and some scenes and targets cannot be focused. In this case, instead of keeping the camera focusing back and forth, it is better to change to manual mode and manually adjust the motor to make the image clear. OK.
2. one-click focus mode (Click F). This is called the single-trigger mode af-s, or the lock focus mode. This mode is suitable for testing the same kind of work piece on the production line. Since the work piece is the same, it only needs to be focused once, and then it does not need to be focused, because no matter how fast the focus is, it will not be. Therefore, it can save time and improve efficiency.
3. Continuous servo auto-focus (AF or af-c). This is a great feature. As mentioned before, when the focus is completed, the program will constantly determine whether the target has changed and whether it needs to be automatically focused again. It is like having an eye that is always watching your every move. No matter how you switch targets, always make sure the image is clear, this is very suitable for detection of high and low objects, need frequent focus. Free your hands and let the camera do it!
Ⅲ.The selection and utility of focusing area
This is also the invention and creation of Buoth photoelectric, I hope you can respect the intellectual property rights, do not copy oh.1. AF ROI size Let's say I want to look at a resistor on a circuit board, but there are dozens of resistors in the focusing area you choose. How does the program know which resistor you want to look at? Please tell it! By selecting a smaller focusing frame, place the resistor you want to see in the focusing frame, OK, So easy. Let the camera do the rest. There are two things here. First, move the resistor you want to see clearly into the focus frame; Second, if the focus box is too large, choose a small one. Large focusing frame is preferred to ensure the accuracy of focusing.
2. Selection of focusing region (Hor,Ver) As mentioned above, we need to move the target (resistor) that needs to be focused into the focus frame. What if my circuit board is fixed? You're always focusing on the central area. Come on, that's not what I'm looking at. Just like I want to see a beautiful woman, you always get a Miss Feng in front of my eyes, but also rely on not to go, vexed not vexed? Don't worry, our focus frame is also optional. Since Miss Feng does not move, my head can move ah, twist the neck, move your line of sight, find your MM. Everything is so natural and simple.
I hope you can have a pleasant experience using Buoth photoelectric products. You are welcome to buy Buoth photoelectric products, give us valuable advice. We grow and progress together. Finally attached is our menu diagram mentioned above.