Learn about mobile cameras
In today’s age of technology, the mobile phone is a very necessary item for people. So In 2020, the current number of mobile phone users is 4.78 billion, including both smart and feature phones. Which is 61.20% of all people in the world. And According to Statista, the current number of smartphone users in the world today is 3.5 billion, and this means 44.81% of the world’s population owns a smartphone.
And now it is possible to run a digital camera with a smartphone camera. So many people keep in mind the quality of the camera before buying a smartphone. But they don’t want to bother with other specifications except the megapixels of the camera. In addition to megapixels, the camera’s aperture, flash, ISO, depth of field, etc. play a role in taking high-quality images. To know more about the camera, see the use of other specifications.
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New features are constantly being added to the camera of the smartphone. However, the most important thing is the lens. The lens can be compared to the eye. The camera sensor captures what can be seen in the lens and stores it in the phone’s storage with the help of software. The quality of the image depends on the quality of the sensor and the image processing software. Modern smartphones are adding dual lenses and powerful image processors for taking high quality pictures. Suitable lenses are being provided for video in high resolution like Fork. Many lenses have a slow motion feature.
The most important part of any camera is the sensor. Whether the sensor is good or bad depends on its size. The size of a normal sensor is 1 in 3 of 1 inch. Then the larger the size of the sensor, the better. There is also a 1-inch sensor.
Two types of sensors are commonly found in mobile phones, one is CMOS and the other is BSI. The BSI sensor is slightly better in terms of low light performance than the Simos sensor. And above all a shiny image makes you. The BSI sensor is flipped, so that the light that enters the camera goes behind the sensor and the light reflection is very low, so you can see the bright image quality.
Usually, after the light reaches the sensor of the camera, it becomes an electrical signal. Later it was converted to digital film. In this case, if the signal is not clear, a lot of noise (grain-like spots) is created in the picture. This is usually the case when taking pictures in low light. To avoid this problem, backside-illumination or BSI sensors are used in today’s smartphones. The back of this sensor has a mirror-like coating.
In this way, the light that has passed the sensor enters the sensor again. This results in brighter and less noisy images even in low light.
The more megapixels the camera has, the more pixels the image sensor will have. A 1-megapixel camera usually has 1 million pixels. If there are more megapixels, the camera size is bigger. Megapixels can also be called image resolution. The quality of the camera should not be verified with just megapixels. Because only the resolution is changed with megapixels. If the sensor is good, you can take good pictures with a relatively low megapixel camera. For example, if the quality of the sensor is good in a 12-megapixel camera, then the picture can be better than a 20-megapixel camera with a low-quality sensor. Good images depend on the quality of the pixels rather than the number of pixels.
The name of the aperture is most pronounced after megapixels.
Exactly how much light can enter the camera
And what is the difference between the original focus of a distant object and that of a nearby object? Its measure is aperture.
The value of aperture is abbreviated as f.
You may have noticed that the aperture of the camera is expressed by the numbers f / 1.8, f / 2.0, f / 2.2 etc. But what are these actually? See the small hand F that is found in this number is the focal length of your camera lens. And the number below is the opening of your camera. This means the diameter of the hole in the camera through which light enters the camera. This number is basically a ratio between the focal length of your lens and the opening diameter of the camera. Larger DSLR cameras have the option to adjust it manually. But you will not get the facility to adjust it manually on the mobile phone. In other words, the default aperture is always available on the part of the company.
Many people think that more aperture means better. The opposite is true. For example, f / 2.2 aperture is larger than f / 2.4 and more light will enter through it.
If the aperture value is low, the picture was taken in low light also looks brighter.
Phase detection and laser autofocus
Initially, when the first autofocus feature was added to the phone, it adjusted the focus by adjusting the brightness and color contrast between the subject and the background.
However, it would reduce the speed of the picture. It was also difficult to focus properly. To help with that, phase detection was first introduced, which basically focuses using the difference in edge light with the center of the camera. Focusing through this comes down to about half. Then laser autofocus is added.
This feature allows you to focus the camera’s distance from the image directly with the laser. As a result, today’s phones are able to focus accurately and quickly.
How light sensitive the camera is can be understood by the standard of iOS. The more iOS in that camera, the more photosensitive the camera. In other words, if it takes 1 second to take a picture while iOS 100 is set, it will take 0.25 seconds to take a picture in iOS 400.
Good quality pictures are available in 100 to 200 iOS in normal light. ISO works to take bright pictures in low light. The lower the light when taking pictures, the higher the ISO. Increasing the ISO makes the picture brighter, but at the same time, there is a risk of increasing the amount of noise in the picture. On the other hand, if the ISO is reduced, it is possible to hold the moving thing stable.
Most smartphone cameras do not take good pictures in low light. Flash is used to darken the image. A total of three types of flash can be seen in the camera flash. Single LED flash, dual LED flash, and dual tone flash. Xenon Flash used to be seen on some Nokia phones and Sony phones but today it is no longer seen.
Single LED flash: Single LED flash means it has an LED. This one LED will generate its light when you flash and you will get the picture.
Dual LED flash: Dual LED flash means it has two LEDs so you can see more light in the flash.
Dual-tone flash: The color of everything looks realistic in the image taken using the flash in a normal digital camera. However, in the picture taken with the white LED flash of the phone, the color becomes a bit pale. To address this problem, smartphone makers are now using two different color LEDs to create a flash, so that the color of the image is accurate and the amount of light is increased. This is called dual-tone flash.
Optical image stabilization
The feature was added primarily to enhance video capture. Videos made on ordinary mobile phones vibrate most of the time, especially when making videos while walking.
This sensor will get rid of this problem. The amount of vibration is measured by the gyroscope sensor of the phone and the vibration is removed by shaking the gyroscope accordingly. As a result, the level of vibration in the video is reduced a lot.
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