We often use LED video processors to process images in LED displays, but many people don’t know what processing and enhancements LED video processors have done to the images. Next, let’s focus on it.
Motion compensation. It involves motion compensation for slow and fast images. Good motion compensation technology can reduce the jaggedness of the edge of the moving image during LED display;
de-interlace. In order to reduce the bandwidth of the video signal and increase the resolution, the interlaced scanning technology must be adopted. When the LED displays, it is necessary to preprocess the interlaced signal to a progressive signal. Excellent de-interlacing technology can eliminate the scanning line effect that exists during live broadcast and shooting;
zoom. LED display adopts modular design and splicing display, so it is the most flexible display medium among all flat panel display media. But this flexibility also brings higher requirements for image and video display, especially the display resolution of each engineering application can hardly be found in the VESA standard. Therefore, a video processor is required to provide a zoom function. The typical zoom function is as follows:
Image reduction: The dot matrix resolution of general display screen engineering applications is below the VESA standard XGA (1024*768) resolution. The video processor needs to be capable of reducing the input signals to the resolution of the corresponding terminal, and it is better to require the video processing device to have the function of pixel-by-pixel scaling (pixel-by-pixel scaling can be performed in the horizontal and vertical directions at the same time).
Image enlargement: More and more engineering applications, especially the rapid development of business such as building advertising, the resolution of LED displays is no longer limited to the conventional XGA resolution, and some engineering applications even reach the level of 2048 points (including Pixel sharing).
In applications like these, it is necessary for the video processor to have enhanced processing technology for image magnification. The key indicator is that the internal processing bandwidth of the video processor can reach or exceed the dot matrix area of 2048×1536 in atypical applications. To cooperate with this kind of application, the video processor is required to have the function of stacking, and the final dot matrix display can be completed through the splicing of multiple video walls.
The video scaling technology is closely related to the key technologies of motion compensation and de-interlacing. The pros and cons of the scaling technology directly affects the smoothness of the images and videos displayed on the large LED screen.
Detail enhancement. The core of this technology is not only reflected in the sharpening of the edges of the image, but also includes the processing of color restoration and image scaling. The quality of this indicator of the video processor directly reflects the clarity of the image displayed on the large LED screen.
Noise suppression. Due to the dot matrix characteristics of LED display, the insignificant noise in other flat panel display media will greatly challenge the psychological tolerance of LED display audiences. The noise mainly comes from the compression noise (mosaic) of the video signal and the random noise of the system itself. The excellent video processor can reduce the interference of noise to the picture quality itself through noise suppression.
Gray scale. Grayscale has always been the goal pursued by LED large-screen display suppliers, but for a long time, most technical teams have been solving the grayscale problem of the LED screen itself scanning, and the grayscale processing has been upgraded to the current 16bit. , 17bit. But it ignores the problem that the input signal source has always been only 8bit. The 8bit of the signal source makes most people’s gray-level enhancement work seem a bit like a castle in the air.