Why are there more and more cameras on mobile phones

In fact, a mobile phone is equivalent to a reduced version of a digital camera, because it is also composed of optical lenses, photosensitive elements, processors, and corresponding software.

How does the mobile phone take pictures? First of all, light passing through the lens of the mobile phone will enter the optical system inside the mobile phone. The optical system is actually a series of lenses that converge the light emitted from the object onto the photosensitive element. The photosensitive element then converts the received light signals into electrical signals, and encodes these electrical signals into a series of digital signals that the mobile phone chip can understand. When the chip receives these digital signals, it stores them, and after a series of processing, turns them into a series of instructions, and then tells each pixel on the display what kind of light should be emitted. Finally, the light emitted by each pixel on the screen is gathered together to form a complete picture.

With the development of technology, people's demand for smartphone photography functions is increasing, including high-definition details, optical zoom, and customized bokeh effects. However, the space inside the mobile phone is limited, and it is impossible to install a huge zoom lens like a professional camera, so multi-camera technology is used to solve these problems.

First of all, each mobile phone has a main camera, the main function is to capture the picture. In fact, the clarity of the main camera's image is completely sufficient, but the image may not be able to highlight the subject enough, or the color may not be bright enough. The outline of the object shot in the night scene mode is also easy to be unclear, especially when shooting distant scenes. Needed for shooting.

So began to appear dual-camera mobile phones, one is a color camera, responsible for taking color photos, and the other is a black and white camera, responsible for taking black and white photos. The color camera mainly collects red, green, and blue light. How do black-and-white cameras and color cameras work together?

For example, a 50 million pixel color camera needs to be divided into 50 million red pixels, 50 million green pixels, and 50 million blue pixels on the photosensitive chip, a total of 150 million areas, so that each area is divided into The area is very small, resulting in very little light received by each pixel. The 50-megapixel black-and-white camera only needs to divide 50 million areas on the photosensitive chip, and the average area that each pixel can receive light is three times that of a color camera, so it can present the picture more clearly. The two cameras will simultaneously take a brightly colored but slightly noisy photo and a clearer and less noisy black and white photo. The photosensitive chip will use the algorithm to synthesize a clear, colorful and brilliant photo.

In addition, people further hope that mobile phones can have functions such as background blur, optical zoom, and wide-angle. So after the dual cameras, a number of auxiliary cameras have been added. The mobile phone can automatically compare the photos taken by different cameras, use the algorithm to identify which object is close to us and which object is far from us in the picture, and then use the set program to display the objects closer to us as clearly as possible. Achieve good shooting results.

In short, each camera on the mobile phone has a reasonable division of labor and performs its own duties. It records the contour, color, distance and other information of different objects one by one, and then synthesizes the image through the mobile phone chip to show it in front of our eyes, fully satisfying Our camera needs.