Digital cameras rely on optical lens structures to achieve zooming. The optical zoom of a digital camera is to zoom in and out the scene to be shot through lens movement. The larger the optical zoom factor, the farther the scene can be shot.
Digital zoom, also known as digital zoom, uses a processor in a digital camera to increase the area of each pixel in a picture to achieve the purpose of magnification.
The "film" of a digital camera is its imaging sensor. The photoreceptor is the core of a digital camera. At present, there are two kinds of core imaging components of digital cameras: one is a widely used CCD (charge coupled) element; the other is a CMOS (Complementary Metal Oxide Conductor) device.
The size of the CCD, that is, the area of the photosensitive device, includes CCD and CMOS. The area of the photosensitive device, the larger the CCD / CMOS area, the more photons are captured, the better the photosensitive performance, and the lower the signal-to-noise ratio.
Maximum number of pixels
The maximum pixel is obtained after interpolation. The interpolation operation is performed by a DSP chip inside the digital camera. When the image needs to be enlarged, the nearest-neighbor interpolation, linear interpolation and other calculation methods are used to add pixels to the image that need to be enlarged after the image is enlarged.
The effective number of pixels refers to the value of pixels that are actually involved in light-sensitive imaging. The highest pixel value is the real pixel of the photosensitive device. This data usually includes the non-imaging part of the photosensitive device, and the effective pixel is the value converted at the lens zoom magnification.
The area that a digital camera can take the largest picture is the highest resolution of this digital camera. For photos (bitmaps) of the same size, the larger the resolution, the larger the picture area, and the larger the file (capacity).
The size of the digital camera display is the size of the digital camera display, which is usually expressed in inches. The larger the digital camera display, on the one hand, it can make the camera more beautiful, but on the other hand, the larger the display screen, the larger the power consumption of the digital camera.
Digital camera LCDs are TFT type. For LCD screens, the backlight source is light from fluorescent tubes. These light sources pass through a polarizing plate and then pass through the liquid crystal. At this time, the arrangement of liquid crystal molecules changes the angle of light that penetrates the liquid crystal.