Mobile phones with cameras have always been respected by people. Especially in the era of smart phones, mobile phone cameras have become the standard configuration of smart phones.As people become more and more demanding about the effect of taking pictures, many technologies used in professional cameras have also been applied to mobile phone cameras.For example: optical anti shake.
Optical anti shake (OIS for short) relies on the structure of special lens or CCD sensor to minimize the image instability caused by shake during use.As an optical anti shake technology, it does not keep the body from shaking, but relies on the special lens or CCD sensor structure to minimize the image instability caused by shake during the use of the operator.
Optical anti shake off
The first is to achieve anti shake through the lens group.Canon and Nikon are the main representatives to achieve anti shake through lens groups. They rely on 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 lens.Usually, the gyroscope in the lens detects a small movement, and sends the signal to the microprocessor to calculate the displacement to be compensated immediately, and then compensates according to the shaking direction and displacement of the lens by compensating the lens set, so as to effectively overcome the image blur caused by the camera vibration.Because this technology has been quite mature and operable, it is often used in mobile phone camera anti shake technology.
The basic principle is as follows: ordinary AF module adjusts the focus by moving the motor in the vertical direction, while OIS module motor can not only move the motor in the vertical direction, but also move the motor in the horizontal direction.The gyroscope converts the jitter information into electrical signals and sends them to the OIS control driver. The OIS control driver pushes the motor to control the movement of the suspension lens to compensate for the impact of jitter. The Hall sensor feeds back the position information of the lens to the OIS control driver, thus forming a closed-loop control.As shown in the figure below.
OIS module control block diagram
The second generation PureView technology adopted by Nokia Lumia 920, which is very popular in the industry recently, has achieved higher stability and more than 5 times higher light input than ordinary smart phones by adopting technology similar to this floating lens, so that it can easily take purer, more stable and clearer photos.
Not only in photographing, but also in video recording, the Nokia Lumia 920 also shows its anti shake effect.Here is the video of Uncle Crazy testing the anti shake effect of Nokia Lumia 920.
In addition to the Nokia Lumia 920, Panasonic's first optical anti shake camera phone, the Panasonic Lumix P-05C, and the so-called Sharp 203SH, also use this optical anti shake technology.
The advantages of mobile phones with optical anti shake technology are self-evident. It is easy to take beautiful photos and complete high-definition video shooting. However, due to the high requirements for lens design and manufacturing and the relatively high cost, few mobile phone manufacturers in China have adopted this technology at present.And it is estimated that the Nokia Lumia 920 is the only mobile phone with optical anti shake function that we can buy in China.Panasonic Lumix P-05C was launched in July last year, but so far there has been no sound in China;The Sharp 203SH is rumored to be launched in March 2013, with three colors: black, white and blue.Judging from the previous launch of Sharp's models, it may be difficult for this model to be launched in China.
Secondly, anti shake is realized by CCD sensor.At present, only Konica Minolta and Pentax can achieve anti shake through CCD sensor. Its principle is contrary to the optical anti shake technology of Canon and Panasonic, which relies on the floating of CCD to achieve anti shake.The principle is to fix the CCD on a bracket that can move up, down, left and right, sense the direction and amplitude of camera shake through the gyroscope, and then the sensor transmits these data to the processor for screening and amplification to calculate the CCD movement that can offset the shake.
Although the cost of this technology is much lower than that of using lens groups to achieve anti shake, it has not yet been used in mobile phone camera anti shake technology due to its late development and less mature technology than lens anti shake.
Knowledge popularization
Category of optical anti shake technology:
(1) Anti shake is realized through special internal structure of Jingdu.Including Nikon VR anti shake, Canon IS anti shake, Panasonic MEGA O.I.S anti shake, Sigma OS anti shake, Sony Super Sterdy Shot, etc.At present, this method is the most common.
(2) Body anti shake technology.It was proposed by Konica Minolta and is currently used by Sony digital SLR cameras.On March 31, 2006, Konica Minolta announced its withdrawal from the camera business and decided to transfer part of its digital SLR camera related assets from its imaging company to Sony.
(3) "Natural anti shake" technology to improve ISO value.The technical representative manufacturer is Fuji.
(4) Anti shake treatment in the later stage.Sharpen the image, for example, Samsung's ASR anti shake uses this method.
(5) Anti shake mode with jitter sensing device but without physical compensation.Sanyo first applied it to the new CG6 digital camera.
