When we look at the world through the small viewfinder of the camera, the lens is our eyes, and what we see is colorful life. I remember that when I was a child, I had to queue up at the photo studio before I could get the photo in a few days. Nowadays, there are a variety of photographic equipment. Not only the threshold of photography has been reduced, but also there are more and more patterns of photography.
In recent years, a sports camera is also popular, which can be fixed on bicycles and helmets, and can take photos and videos in water and in various harsh environments. It has been widely praised by young people and outdoor sports lovers.
Anti shake is very important for motion cameras. Sometimes the videos and photos we take are not clear enough, and there are occasional ghosting or blurring. This is because in the actual shooting, after the light enters the image sensor, the slight jitter in the photosensitive process is inevitable. The jitter may come from the photographer itself or the shutter time is not short enough. At this time, some measures are needed to reduce the image blur caused by jitter.
There are many kinds of anti shake, the more common are optical anti shake and electronic anti shake. In comparison, the cost of optical anti shake is higher. The principle of optical anti shake is not difficult. It relies on the gyroscope in the lens to sense the shake. When the instrument senses the small shake, it will immediately transmit the signal to the relevant microprocessor at a very fast speed, and then adjust the displacement of the lens to be compensated through the calculated data. At this time, the machine will call the compensation lens group or mobile image sensor according to the data to eliminate the impact of the shake. The lens of the well-known iphone6 plus is equipped with optical anti shake, so even the photos taken on a bumpy car will not be blurred.
Electronic anti shake is to use digital circuit to process the picture, so as to prevent shake, that is, there is no adjustment and intervention at the physical level. When the micro sensor related to the camera detects jitter, the anti jitter circuit of the camera starts to work. At this time, the image has actually been generated, but it is not complete. Then the digital circuit predicts the jitter direction, and finally uses the remaining resources to calculate and supplement the picture, so as to finally get a picture that is not so fuzzy.
Electronic anti shake is characterized by low cost and no need to adjust the lens group on the lens, but it actually reduces the utilization of the image sensor, which will affect and lose the picture definition and resolution.
Some motion cameras on the market are equipped with anti shake function, and some are not equipped with anti shake function. This is because on the one hand, some manufacturers believe that motion cameras are usually installed in a bumpy environment, so anti shake is useless; On the other hand, it is to save costs. However, not everyone uses the camera in a bumpy environment. In the view of consumers, the camera with optical anti shake is naturally better than the camera without anti shake.
For photo quality, anti shake is on the one hand, and image quality on the other. Whether it is a camera or a video camera, the shooting effect is roughly determined by three aspects: lens group, image sensor and related microprocessor. Among them, the more important is the image sensor, which is also the key factor to determine the shooting quality.
Generally speaking, the type, size and pixels of image sensors determine the quality of photos. The image sensor has high and low prices. As long as the manufacturer is willing to pay the cost, it can be configured very well.
Another key factor affecting the imaging effect is the imaging algorithm. Generally speaking, it is the process of obtaining the final image after the image passes through the image sensor and then processed by a series of processors. This has nothing to do with hardware, it’s a matter of program. All manufacturers can configure the hardware through high investment, but if there is a problem with the algorithm, it will still have a great impact.
In the above, we mentioned the basic principle, anti shake and algorithm of motion camera. In fact, any single one will not be too dominant compared with traditional cameras. Before the emergence of motion cameras, there were also some cameras dedicated to shooting motion scenes. The disadvantages are large volume, inconvenient to carry, and strict requirements for light and shooting environment. The advantage is that the anti shake effect is good, the picture quality is clear, and the lens is reliable, so the pictures of some videos and photos taken are very good. For example, the driving chase scenes and explosion scenes in some films are shot by expensive professional shooting machines, not the popular sports cameras.
Source: Popular Science China
Post time: 03-19-2022