1. What is HDR?
HDR (High Dynamic Range) is an image and video technology used to achieve a greater exposure dynamic range (greater light and dark differences). For example, the general TV maximum brightness 300nit, minimum brightness 0.3nit, contrast ratio 300/0.3=1000, HDR TV maximum brightness 1000nit, minimum brightness 0.05nit, contrast ratio 1000/0.05=20000, high contrast, the dark part of the picture is darker The bright part will become brighter, plus the high color gamut and high color depth will make it look more real.
2. How do you count HDR?
There are no uniform standards. For example, the Blu-ray Disc Association (BDA), the Consumer Electronics Association (CEA), the UHD Alliance, and others all have their own standards.
The following is a simple comparison between the CEA standard and ordinary TV:
As can be seen from the above table, HDR televisions are processed from the interface to the picture quality, and then to the backlight control until the screen is presented. Compared with the general television, there are new advancements. Finally, HDR television sources are added, showing more than the average TV. One floor of the outstanding quality.
3, how to achieve HDR effect?
If you want to see the true HDR effect, HDR effect is required with HDR source + HDR TV.
However, considering that there are few HDR sources at present, some manufacturers have come up with the solution of the general chip source + HDR TV with processing function = HDR effect (similar to 2K to 4K). For example, domestic TCL and other manufacturers, by adjusting the saturation, to ensure that the color does not produce deviations. At the same time, enhance the dynamic technology to pass the original SDR signal through the brightness compensation, so that the source brightness details are closer to the HDR standard display brightness.
4. Analysis of development issues
Through the advancement of HDR shooting, transmission and playback technologies, consumers can enjoy a closer and more realistic viewing experience at home. However, as a newly introduced video enhancement technology, HDR still has some urgent needs to be resolved. problem.
The first is insufficient content. The lack of content may be the common problem faced by various hardware technologies. From the previous 3D to the current 4K or even 8K resolution high-end products to HDR, users lack the visibility after purchasing hardware. Content is a major problem that drastically reduces the user experience.
The second is that the standard has not yet been unified. As mentioned above, currently there are various standards in the industry regarding HDR, there are standards produced by international associations, and there are standards developed by hardware and software vendors, and no effective unity has been formed. From the shooting, production, transmission to playback, etc., compatibility is poor in the short term. If it is not possible to formulate a common standard in the related industry chain in the short term, the confusion of standards will certainly become a bottleneck that hinders the development of HDR.
Related HDR knowledge:
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