OppOR7 mobile phone photography

In the mobile phone industry, the cameras of Apple, Samsung, htc and Nokia have the best functions. It doesn't mean that the photos taken with high pixels are necessarily good, and the knowledge inside is not clear in a few words.

The following is the main content of the article: In order to improve the quality of taking pictures, various mobile phone manufacturers are vying for camera pixels, from 5 million to 8 million, and now it is130,000. 13 million has almost become the standard for camera pixels of smart phones this year, such as Galaxy S4, LG Optimus G Pro and Xperia Z. Is the camera pixel as high as possible? Of course, 5 million pixels is better than 2 million 3 million pixels, but 6.5438+0.3 million pixels is not necessarily better than 8 million pixels. HTC supports the view that "the higher the pixel, the better". The company has previously launched HTC Titan II, a16 megapixel camera smartphone. However, this year, the company's flagship smartphone HTC One has only 4 million camera pixels. HTC explained that the era of simple pixel spelling is over, so HTC uses ultrapixels technology to improve the quality of photos. Its pixel size is larger than the traditional pixel size, and it can absorb more light. The shooting ability of a high-quality 5 megapixel camera is probably better than that of an inferior1200,000 pixel camera. The shooting effect of the camera is not determined by the number of pixels, but by the quality of the whole camera module. The whole camera module contains many components, such as camera size and manufacturing materials, optical sensors, image processing hardware and software. Sensors Most professional photographers will tell you that the most important and critical component of an optical system is a sensor, because its main function is to capture light. Without light, there would be no photos. The light enters the camera and then reaches the sensor, which receives the information and converts it into an electrical signal. Then, the image sensor creates an image and fine-tunes the defects of the image, such as noise. In addition, the size of the image sensor is also extremely important. Generally speaking, the bigger the sensor, the bigger the pixel, the bigger the pixel, and the more light it can absorb, the better the photo. An expert in camera described the relationship between pixel and sensor as "water and barrel" or "water and well". The bigger the bucket, the more water it can hold. The reason why the 8-megapixel camera of SLR digital camera is better than the smart phone with the same pixel is that the camera sensor of SLR digital camera is larger and can absorb more light. More light means less noise and better dynamic range. Perhaps you have begun to realize that putting more and more pixels on the sensor may not be the best way to improve the resolution. But this does not stop the mobile phone industry from continuing to do so. When the pixel group of mobile phone jumped from 6.5438+0 million to 2 million pixels, Gartner analyst Jon Erensen said that they would reduce the pixel size and put more pixels into the image sensor. The pixel size becomes smaller, and it is more difficult for light to enter the photosensitive part of the sensor. Finally, the resolution of the image is not improved much, but there is more noise. The relationship between the number of pixels and the physical size of the sensor is the reason why some 8-megapixel smartphone cameras have more than 1200,13 million or even16 million pixels. The pursuit of thinness in smartphones also limits the size of sensors. Since we can't improve the photo quality by increasing the size, we can only adopt the method of increasing pixels. Bjorn Kilburn, vice president of HTC's portfolio strategy, has disclosed that the pixel size of Titan II16 megapixel camera is 1. 12 micron, while the pixel size of HTC One X 800 megapixel camera reaches 1.4 micron. The shooting effect of these two mobile phones is the same. Unfortunately, most smartphone manufacturers are reluctant to disclose camera components and sensor size details. Nokia's 4 1 10,000-pixel PureView technology The core part of PureView technology is the process of "concentrating" an image of 4 1 10,000 pixels into an image of 5 million pixels, that is, "oversampling". In practice, every 8 pixels will be integrated into a "super pixel". This means that under the same conditions, the light with the same intensity will shine on the pixel point much larger than the general 5 million pixel sensor after entering the lens. Nokia has spent about five years researching Pureview technology. In addition to using a larger image sensor of11.2 inches (between 1/2.3 inches and 4/3 inches of ordinary DC), 808 PureView has also made many custom algorithms on the sensor to adjust the image and eliminate noise. In addition to the size and quality of lens and sensor, image processing technology is also very important. The CPU of most modern high-end smartphones integrates the graphics processor into the chip, which can quickly render images, such as photos, videos and games. HTC and Samsung have been working hard to develop the continuous shooting model. With an independent hardware acceleration processor, a mobile phone can take a photo in an average of one tenth of a second or less. But the disadvantage of continuous shooting is that users don't have time to adjust the focal length, which sometimes blurs the photos. In addition, the image processor can achieve zero shutter delay, and when you press the shoot button, the camera can capture the image. Other factors Nowadays, many smart phones use backlight sensors, which have better shooting ability in low light because of their increased sensitivity. In the field of low-light shooting, Lumia 920 is the best low-light shooting mobile phone, and iPhone 5 is also good. In addition, the newly released HTC One is also trying to promote the low-light shooting performance of mobile phones. Indeed, the low-light shooting ability of HTC One is far above that of Samsung Galaxy S4. So far, we know that the sensor size, pixel size and image processor of a camera play a key role in the picture quality. In addition, there are other factors that can affect it, such as high-quality components. The total cost of all the above elements is not cheap. The cost of camera module is only a fraction of the cost of smart phone. Jon Erensen, an analyst at Gartner, said that the price of a high-end camera module is twice that of the basic module, which is about 15 USD. Practicality is the convenience of the camera function of Wangdao mobile phone, and the overall user experience is very important. The simplicity of opening the camera application, the shooting speed, the special effect of the photo and the shooting mode add up to determine whether this is the camera that the user wants. Now more and more mobile phone manufacturers, such as HTC, LG and Samsung, have added many extra tricks to taking pictures. For example, smile detection, choose the best one from multiple photos. In addition, the front and rear cameras take pictures or record videos at the same time. These functions are very interesting, but for most mobile phone users, how to share pictures quickly and conveniently is more important than the number of pixels. Look at Twiiter and Instagram to know this. Jon Erensen, an analyst at Gartner, agrees. He said that when users upload photos from their smartphones to online photo albums or send photos to the mailboxes of friends and relatives, the required formats are all below 8 million pixels or even 5 million pixels. Generally speaking, when we compare the specifications of smart phone cameras, it is not enough to look at the number of pixels, but also all the software and hardware, as well as practicality.