Detailed explanation of mobile phone camera anti-shake technology
The pixels of smartphones with 5Meg, 8Meg, and 12Meg high-pixel cameras are getting closer to DSC. But the high-resolution mobile phone camera does not contain some optical or mechanical parts of DSC. This lack of hardware will undoubtedly make the camera phone's camera effect worse than DSC.
The introduction of anti-shake technology can make the effect of high-pixel camera closer to DSC. At present, our camera's anti-shake technology mainly uses the following types: Optical Image Stabilizer (Optical Image Stabilizer, hereinafter referred to as OIS), mobile CMOS chip surface, algorithm anti-shake, JPEG transmission, High-ISO, MIPI transmission. Among the several technologies listed, our current commonly used algorithms are anti-shake algorithm, JPEG transmission, High-ISO, MIPI transmission. It is expected that OIS will be used in the future. The following describes several commonly used methods to prevent hand shake.
1. OIS
The realization of anti-shake through the lens group mainly relies on the magnetic force to wrap the suspension lens, so as to effectively overcome the image blur caused by camera vibration, which is more obvious for digital cameras with large zoom lenses. Usually, the gyroscope in the lens detects tiny movements, and transmits the signal to the microprocessor to immediately calculate the amount of displacement that needs to be compensated. Then, through the compensation lens group, it is compensated according to the shake direction and displacement of the lens, which is effective To overcome image blur caused by camera vibration. The effect of the optical image stabilization function is quite obvious. In general, turning on this function can increase the shutter speed by 2-3 stops, so that hand-held shooting will not produce blurring and blurring phenomenon. In telephoto digital cameras, the effect is immediate.
2. Algorithm to prevent hand shake
The electronic anti-shake technology uses dynamic vectors in jitter detection. Based on the motion vector, grasp the direction and amount of the image swing, and use this as a reference to move the image position in parallel to generate a shake-free moving image.
3. High-ISO anti-shake
Now APTINA, OVT, FUJITSU, NEC all use the High-ISO method to prevent hand shake. This anti-shake effect has an effect on the image, that is, a certain amount of noise is introduced, but this is the lowest anti-shake Way, it's easy to achieve.
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