Traditional Culture Encyclopedia - Photography major - Which pixel is better, 50 million pixels or 65.438+0 billion pixels? Parameter description of mobile phone camera

Which pixel is better, 50 million pixels or 65.438+0 billion pixels? Parameter description of mobile phone camera

(This article mainly explains the mobile phone camera, which is not exactly the same as the camera. )

Pixel is the basic unit of a digital image, and the resolution of the image is usually expressed in pixels per inch (PPI). So pixels refer to the resolution of the camera. The larger the pixel, the more photosensitive elements, and the greater the corresponding cost. The image quality of a camera is partly determined by pixels. When it is larger than a certain size, it is meaningless to simply compare pixels. At present, the pixels of mainstream SLR cameras are around1000000, but 5 million pixels are enough for ordinary photography and home use, because the resolution of the display we use is limited, generally from 1024 768 to 1920 1200, so that,

In addition, besides pixels, there are two concepts that we have to know.

maximum pixels

The English name is Maximum Pixels, and the so-called maximum pixel is obtained by interpolation. Interpolation operation through the built-in DSP chip, when the image needs to be enlarged, the nearest neighbor interpolation, linear interpolation and other operation methods are used to add the pixels that need to be added after the image is enlarged. The image quality obtained after interpolation operation can't be compared with the real photosensitive image. Some merchants in the market will mark "XXX pixels can be realized by hardware interpolation", which is the same principle, but from the perspective of image quality and sensitivity, photos taken with the largest pixel are not as clear as those taken with effective pixels. The largest pixel also refers directly to the pixel of CCD/CMOS photosensitive device. In order to increase sales, some businesses only promote the maximum pixel. When setting the picture resolution, they do take pictures with the highest pixel resolution. However, users should be aware that this is a numerical value obtained through internal calculation, and the loss of image quality will be very obvious when printing pictures.

effective pixels

Effective number of pixels is called effective number of pixels in English. Different from the largest pixel, the effective pixel number refers to the pixel value that really participates in photosensitive imaging. The value of the highest pixel is the real pixel of the photosensitive device, and this data usually includes the non-imaging part of the photosensitive device, while the effective pixel is the value converted under the zoom magnification of the lens. Take Minolta's DiMAGE7 as an example, its CCD pixel is 5.24 million (5.24 megapixels). Because some CCDs do not participate in imaging, the effective pixel is only 4.9 million. Digital pictures are generally stored in pixels, and each pixel is the smallest unit in digital pictures. The larger the pixel, the larger the area of the picture. To increase the area of a picture, if no more light enters the photosensitive device, the only way is to increase the area of pixels, which may affect the sharpness and clarity of the picture. Therefore, under the condition of constant pixel area, the camera can get the largest picture pixel, which is the effective pixel.

Many friends may have some misunderstandings about the pixels of the camera, such as 50 million pixels or 65.438+0 billion pixels, which is better?

In fact, the film-forming effect does not depend entirely on the number of pixels. Pixels determine the resolution of the picture. The higher the pixel, the clearer the picture quality, such as 1 100 million pixels. For example, the resolution of Xiaomi's mobile phone can be as high as 12032 9024. The advantage of high pixels is that a picture can be enlarged very clearly, but it also takes up very large memory, greatly reducing battery life and processing power.

For example, Leica SL2 has only 47 million pixels. As one of the best cameras, the price is as high as 49 thousand. Can a 100-megapixel mobile phone be better than Leica? Starting from the N-generation iPhone, its camera is 654.38+0.2 million pixels. It is undeniable that its membrane quality is also first-class, and it is compared by major manufacturers every year. Do you think it's 6.5438+0.2 million pixels?

There are several points that really determine the quality of mobile phone photo film. Such as his coms (image sensor). As the saying goes, "the bottom layer is the first level to crush people" is the size of the sensor. The larger the sensor size, the better the film quality. We see that if the manufacturer indicates, for example,11.28 ",this is his sensor size.

And its micron (micron), simply refers to the size of a single pixel on the image sensor. The larger the pixel, the better the film-forming performance, such as 1.22μm indicated by the manufacturer.

Aperture is simply a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. The larger the aperture, the more light enters and the brighter the picture (just like seeing things clearly on a sunny day). Large aperture can also create a depth of field, the shutter speed is faster, the shooting effect is better, and the noise caused by insufficient light is reduced, such as f/ 1.8 marked by the manufacturer.

Another important point is the adjustment of mobile phone manufacturers, which is very important. For example, Apple's adjustment is very good!

Of course, what I said above is not all, there are many points. I won't expand it. I mainly explain the most important parameters to you. Please correct me if there are any mistakes!

At present, Samsung and Sony should have the highest market share in the mainstream of mobile phone coms. At present, I personally think that Samsung's GN2 is one of the best coms at present, and its invincible outsole is still the strongest by far. Let me give you a comparison.

Samsung GN2:11.12'' has a very large cardinal number, and a single pixel 1.4μm is simply yyds.

Sony's IMX707 is also excellent, 1/2.8'' big base, single pixel1.22μ m.