The 3D field standard war is being staged: The test method standard locks four major indicators

With the rapid expansion of the 3D market and the continuous development of 3D technologies, China, the United States, Japan, and South Korea have all stepped up their development of standards according to their national conditions. A standard war in the 3D field is being staged.

As the competent department of the industry, the Ministry of Industry and Information Technology attaches great importance to the supporting role of standards for industrial development, and actively guides and promotes the standardization of three-dimensional television. The project was set up in the “Industry and Information Technology Department's first batch of industry standard revision plan in 2010”. The "stereo TV image quality testing method" industry standard, and actively promote the establishment of the national standard of "stereo TV terminology". At present, the standards for 3D test methods developed by the China Electronics Standardization Institute are also being developed.

Standards do not restrict the development of industries Due to the lack of a unified 3D standards system, the current standards do not play a role in guiding the development of the industry.

At this stage, various global alliances and organizations have formulated relevant standards systems according to their own circumstances. In terms of the development of international standards for stereoscopic display technologies, IEC/TC110 lists the roadmap for standards development for stereoscopic display technologies in the next few years and begins to push forward the development of various standards in the roadmap as planned. At present, IEC/TC110 has proposed a draft in the aspect of stereoscopic display parameter testing. IEC/TC100 is also carrying out standardized research work on 3D TV systems.

In the current development of the 3D industry in China, although the 3D content has increased, there are still differences in standards such as movie formats and compression methods. The key to industrial development lies in the standards. Under the premise of unified standards, companies can only use content for shooting, video compression, signal transmission, and hardware decoding. In this regard, our country has accelerated its pace in standard setting.

There are roughly three factors influencing the rapid and healthy development of the 3D display terminal market. First, relevant 3D industry standards, especially 3D display equipment-related test standards have not yet been completed, resulting in 3D products that cannot be mass-produced and the generalization effect is general. Second, serious 3D content. In the absence of 3D equipment, basic 3D equipment is now available, but it lacks content support and cannot be widely used. Finally, standards and product marketization are closely related. At present, the 3D market industry is not yet mature enough to develop its own technologies and original functions for each government. There are already a number of companies participating in the market. A considerable number of consumers already own this product, but the 3D testing industry standards and industrial technology policies that regulate the market have not yet been finalized.

The standards related to 3D technology are not unified and the standard issue has become a bottleneck that restricts market development after the content issue. Researching stereoscopic TV image quality testing methods, developing test systems, building test platforms, and actively advancing standards development for 3D technologies and related equipment will play an active role in product maturity and stable market development.

The draft test method suitable for China's national conditions will consider the performance of different display technologies in terms of technical indicators such as crosstalk, viewing angle, and flicker.

The main difficulty in the standardization of the 3D test method is how to form a unified test method standard for active shuttered and polarized 3D televisions.

In response to this problem, the Working Group of Stereoscopic Display Standards established by the China Electronics Standardization Institute as the lead unit has carried out a large amount of research work and has organized the drafting of "Methods for Testing Quality of Stereoscopic Television Pictures" (draft for soliciting opinions). This draft standard investigates the measurement conditions and measurement methods for stereoscopic image quality of time-division and split-type flat panel stereo displays and flat panel stereoscopic displays that require wearing stereoscopic glasses as an auxiliary device, and is applicable to a time-sharing type that requires wearing stereoscopic glasses as an auxiliary device. And spectroscopic flat panel stereo TVs, high-definition flat panel stereo TVs, and flat panel stereo displays are used as the basis for assessing stereoscopic image quality during design and testing.

The characteristics of the measurement vary depending on the respective characteristics of the stereoscopic display and the glasses. The best combination of displays and glasses shows the best features. The draft recommends using glasses specified by the display manufacturer as much as possible.

The main indicators covered by this standard include 3D turn-off ratio, 3D contrast, 3D brightness uniformity, 3D chroma uniformity, white hue, color uniformity, binocular chromatic aberration, binocular crosstalk, and viewing angle. Among them, test methods such as crosstalk, viewing angle, and flicker are widely concerned and discussed in the industry.

The China National Institute of Electronic Standards National Digital Audio & Video and Multimedia Product Quality Supervision and Inspection Center organized testers to analyze and test different proposals at home and abroad, and believed that technical indicators such as crosstalk, viewing angle, and flicker should be formed in line with China’s 3D standards. Display test methods and evaluation systems for industry characteristics.

In terms of cross-talk testing, the study considers that the left and right eye cross-interference indicators are used to measure the degree of cross-interference between left and right eyes. In addition to white (100% white) and black (0% black) signals, the use of intermediate gray levels in the full-screen 9 points The crosstalk performance is evaluated and a uniform calculation method for liquid crystals and plasma televisions is presented using the principles of standard deviation and the like.

In terms of view angle testing, a cross-talk test result should be closely combined with a unified analysis to give perspective indicators.

In terms of flicker testing, it is recommended that different levels of testing should be carried out according to the product classification, and the theoretical value and subjective judgment value should be considered together. The 2D TV test method in the existing international standards cannot be copied.

In practical testing, optical measuring instruments need to have integrated fixtures with the glasses. This can improve the coaxiality of the lenses and glasses of optical measuring instruments. Stereoscopic glasses should be restarted before each test to ensure that glasses and television are synchronized.