Camera stroboflash prevention device

Abstract

The invention belongs to the technical field of camera stroboflash prevention, and discloses a camera stroboflash prevention device which is arranged in front of a lens of a camera module and comprises a light reducing piece module, a movement mechanism is connected to the light reducing piece module, and multiple groups of light reducing piece assemblies are arranged in the light reducing piece module in a sliding mode. Coaxial light holes are formed in the light reducing piece module and the movement mechanism, the light reducing piece module comprises a guide rail plate and a light reducing piece assembly, a guide groove is formed in the guide rail plate, the light reducing piece assembly is arranged in the guide groove, and the movement mechanism drives the light reducing piece assembly to slide in the guide groove. According to the device provided by the invention, camera stroboflash can be avoided, the picture brightness is relatively natural, the camera stroboflash can be avoided, the picture effect can be considered in different scenes, and overexposure cannot be generated. Meanwhile, the device is compact in structure, small in size, simple in structure and suitable for being widely applied to camera modules in the fields of mobile phones, computers, intelligent television equipment, digital conference equipment and the like.

Description

technical field [0001] The invention relates to the technical field of anti-camera flickering, in particular to an anti-camera flickering device. Background technique [0002] Camera strobe, also called power frequency flicker, power line flicker, English Power-line flicker. Camera flicker is a common physical phenomenon when the camera is shooting or video recording under the electric light source environment. [0003] Since the frequency of alternating current in my country is 50Hz, and the frequency of alternating current in countries such as Britain and the United States is 60Hz, the corresponding energy change frequencies are 100Hz and 120Hz respectively. Incandescent lamps and some fluorescent lamps will flicker brightly and darkly at the corresponding frequency of alternating current energy changes during the working process, but because the flickering frequency exceeds the perception range of the human eye, this kind of flickering cannot be directly perceived by peo...

AI Technical Summary

Problems solved by technology

[0004] CMOS image sensors are widely used in mobile phones, computers, smart TVs, digital conference equipment, security equipment, vehicle equipment, medical equipment, military equipment, and aviation equipment. Most of these CMOS image sensors use rolling progressive exposure methods ;In most environments, lighting fixtures powered by AC power are often used, such as incandescent lamps and some fluorescent lamps. When the camera is shooting or videoing in this light source environment, it is very easy to have camera flicker, which seriously affects the image quality and has a very poor quality. user experience

[0005] The existing technology generally adopts the following strategies to solve the problem of camera flicker: the first solution is to change the light source environment: for example, draw the curtains to make the camera measure light in the dark, turn off the light source that causes strobe or replace the light device that causes strobe ; But this method requires user intervention, the experience is not good, and the user may not even accept it

The second solution is to change the camera module model: different camera module sensor parameters have certain differences, and the probability of stroboscopic occurrence in some scenes is also different, so in theory, you can choose the one with a lower stroboscopic probability However, changing the sensor model means that the manufacturer needs to change the design plan, cost plan, and even sacrifice the excellent characteristics of the original sensor; and the scene of strobe flicker after replacement is relatively rare, but it cannot be avoided fundamentally strobe

The third solution is to adjust the camera sensor exposure parameters from the software: for example, set the exposure time to an integer multiple of 1 / 100s (the corresponding AC power supply is 50Hz) or increase EV until the stroboscopic disappears; this method can eliminate the stroboscopic But it will cause the picture to be overexposed

However, people generally use an electronic ND mirror (electronic ND mirror) or a variable aperture to reduce the amount of incoming light at the front of the camera lens. However, the electronic ND mirror is generally used in high-end professional camera equipment, and the cost is extremely high, so it is not easy to popularize; limited by cost and Due to size restrictions, it is difficult to add variable apertures to camera modules of mobile phones, computers, etc. A small aperture is an ordinary aperture, which cannot avoid flickering)

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