Video Conference Camera Senior Knowledge Supplement

Video conference camera senior knowledge supplement

CCD

CCD (Charge Coupled Device), or "charge coupled device", in megapixel units. The number of megapixels in a digital camera specification refers to the resolution of the CCD. The CCD is a light-sensitive semiconductor chip that is used to capture graphics and is widely used in scanners, copiers, and filmless cameras. Similar to the principle of film, the light passes through a lens and projects the graphic information onto the CCD. Unlike film, however, CCDs have neither the ability to record graphical data nor the ability to be permanently stored or even have "exposure" capabilities. All graphics data will be fed into an "analog-digital" converter, a signal processor, and a storage device (such as a memory chip or a memory card) without stopping.

CMOS

CMOS (Complementary Metal Oxide Semiconductor) is a "complementary metal oxide semiconductor." It is an important chip in the computer system, and it holds a large amount of data needed for system guidance. The CMOS sensor is convenient for large-scale production, and it is fast and has a low cost. It is one of the key development directions of digital cameras.

White Balance

Under different light sources, the photographs will be color cast because of the different color temperatures. For example, when the color temperature is low, the red and yellow light contents in the light are relatively high, the color of the photographed photograph will be reddish, and the yellow color will be high. When the color document is high, the blue and green colors in the light will be more, and the photograph will be blue and green. At this point, it is necessary to use the white balance function to make corrections. The principle is to control the brightness of the ternary colors of red, green, and blue in the light, so that the maximum light position in the image is pure white, and the other colors can be made accurate.

Interpolation

A method of increasing the size of an image pixel without generating a pixel calculates the color of the missing pixel using a mathematical formula based on the color of the surrounding pixels. Some cameras use interpolation to artificially increase the resolution of the image.

Bit (bit)

This is a term used in computer graphics to describe the number of colors that a generated image can contain. "8-bit depth" means that the image contains only 256 colors. Today's digital cameras have a color depth of 8 bits for each color. Since the color of each pixel is a mixture of red, green, and blue colors, the image contains 256 × 256 × 256 colors, a total of 167 million, which is the so-called 24-bit color.