Digital image processing method

With the continuous development and application of digital technology, many information in real life can be processed and stored in digital form. Digital images are such images stored and processed in digital form. Using a computer, it can perform processing that can not be realized by the usual image processing technology. It can also be transmitted on the Internet and can be copied without distortion.

First, the method of obtaining images

Many images with images use analog images such as 35mm slides, transmissive films, or reflective films. To obtain a digital image, the pixels in the image must be converted into digital information for processing and processing on the computer. The job of converting analog images into digital images is usually done by a scanner. The scanner measures the light emitted or reflected from the picture, sequentially records the value of the spot and produces a digital copy of the color or black and white. This image is translated into a series of numbers and stored on the computer's hard disk or other electronic medium such as a removable hard disk, a graphic CD or a recording tape. Once the image is converted into a digital file, it can be electronically transferred from one computer to another.

Terms to understand

Simulation image - a data stored in a continuous form. For example, a photo taken with a traditional camera at the beach is a simulated image.

Digital image - data processed with binary digits (such as on and off), such as digital photographs taken with a digital camera.

Scanner - A digitized input device that produces a copy of a bitmap for electronic processing.

Second, the digital method of design planning

A wide range of applications can support digital image processing, such as generating digital graphics, modifying digital images, performing some technical processing such as page design, and combining some pixels in one image.

The images produced by applying these software are divided into two major categories, vector graphics and bitmap images.

Vector graphics are often used for segment plots, logo statements, and any image that requires a smooth transition to sharp edges. One of the advantages of vector graphics is that they can be arbitrarily zoomed in and out without losing detail or clarity and without being distorted.

Bitmap images are usually images such as pictures or photos, such as those obtained with a scanner. The bitmap image uses the software in the scanner to “map” the image information into a corresponding space in the virtual graphics grid, and the color pixels fill each of the cells to form the entire image. Unlike vector graphics, bitmap images cannot be arbitrarily enlarged without very good image quality. When the image is enlarged, the pixel grid size also increases accordingly, and the sharpness decreases. Therefore, in order to obtain sufficient image details, it is important to select the size of the scanned bitmap image. Bitmap image files are usually much larger than vector graphics files because more information is needed to recreate images.

There are many formats used to describe graphic image files. Two of the most widely used are the Tagged Image File Format (TIFF) format and the EPS (Ecapsulated Postscript) format. TIFF is a commonly used bitmap image format, and vector graphics are similar to EPS files. Different types of graphic image files can be combined and designed and formatted in a common file format.

After the design layout is completed, all the pixels are concentrated in a file, which can contain vector graphics and bitmap images stored in different file formats. This file can be converted to a raster graphics format file (a bitmap format) required by the output device. The size of the raster in the output device is fixed, depending on the resolution of the output device. At this point, all pixels in the file, regardless of the original format, will be bitmapped so that the output device can reproduce the image.
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