What is the major of digital imaging?

Digital images are also called digital images. That is, digital images. It is basically a two-dimensional matrix, and each point is called a pixel.

The spatial coordinates and gray values of pixels have been discretized, and the gray values change with their point coordinates. Digital images can be generated directly when scanning the sensors of space or aerial remote sensing images, and recorded on magnetic tape; Analog photos can also be digitized by an image digitizer and recorded on a digital tape. The number of pixels in a digital image and the quantization series of pixel gray level are usually an integer power of 2. Generally, the maximum number of gray quantization levels is 28 or 256. The expression of digital image can be transformed from "spatial domain" to "frequency domain" by Fourier transform, and various digital image processing can be carried out, such as data compression, image enhancement, automatic classification and so on.

Digital photography refers to a physical pattern completely represented by a set of regular digital quantities. The characteristics of digital are: large gray dynamic range; The density resolution is relatively high; Good linearity; Rich in levels; Post-processing can be performed; The radiation dose is small. Compared with traditional images, the imaging principle, record carrier, transmission mode and processing mode of digital images have changed completely. It has incomparable advantages in convenience, shooting cost, shooting effect, post-processing and flexibility. The post-production of digital photography is in the so-called "electronic darkroom", using computer software to adjust and improve the picture according to the photographer's creative intention. The powerful image processing function of the software allows the creator to play a strong subjective initiative.