CN104010187A - Evaluation device and evaluation method for stereoscopic TV image flicker - Google Patents

Abstract

The invention discloses an evaluation device and evaluation method for stereoscopic TV image flicker. The evaluation device is set in a darkroom environment and mainly includes a luminance meter, a spectrum analyzer connected to the luminance meter, a stereoscopic TV set facing the luminance meter at a distance, and a 3D TV set between the luminance meter and the 3D TV set to be tested. Interchangeable stereoscopic TV glasses, and a TV signal source connected to the stereoscopic TV to be tested. During evaluation, adjust the distance between the 3D TV to be tested and the luminance meter and the highest image quality supported by the TV, then record the luminance at the center of the screen by changing the left and right lenses, and use a spectrum analyzer to measure the intersection of luminance and luminance respectively. For the DC component, the preliminary determination of image flicker can be realized non-specifically through the evaluation formula. The invention simplifies the process of testing and data analysis, and provides a reliable reference basis for the flicker processing of the stereoscopic TV display technology.

Description

Evaluation device and evaluation method for stereoscopic TV image flicker

technical field

The invention relates to a stereoscopic TV image evaluation system, in particular to an evaluation device and evaluation method for accurately evaluating the image flickering degree of a stereoscopic TV set. the

Background technique

With the development of 3D display technology, 3D TV has entered thousands of households, changing people's traditional viewing mode. The sense of presence and stereoscopic effect are the remarkable features of 3D TV. However, people have also found some disadvantages of stereoscopic display, such as sometimes blurred images, video crosstalk, and flickering, which easily cause visual fatigue, and the flickering of stereoscopic TV screens is the most prominent. All kinds of shortcomings make viewers question the maturity of stereoscopic TV technology, so the key technical index of stereoscopic TV image flicker is worthy of further study. At the same time, TV manufacturers at home and abroad have also proposed some new technical terms, developed some new products, and developed non-flicker 3D TVs in response to this shortcoming, which has been welcomed by consumers. the

In fact, the basic structure of the stereoscopic TV is still the structure of the original flat-panel TV, and the main components are liquid crystal screen (LCD) or plasma display screen (PDP) and related modules. Based on such a mechanism, flickering of stereoscopic display images is unavoidable, especially in plasma display screens, which have large areas of flickering, and this phenomenon is also determined by its own display principle. the

Contents of the invention

In view of the defects of the above-mentioned existing stereoscopic display technology, the object of the present invention is to propose a device and method for evaluating the flickering of stereoscopic TV images, so as to solve the problem of evaluating the degree of flickering of stereoscopic TV sets at present. the

The above-mentioned first object of the present invention, the evaluation device for the flickering of stereoscopic TV images is arranged in a dark room environment, and the technical solution for its realization. The evaluation device includes: The three-dimensional TV set to be tested at a certain distance, the replaceable three-dimensional TV glasses arranged between the luminance meter and the three-dimensional TV set to be tested, and the TV signal source connected to the three-dimensional TV set to be tested, wherein the three-dimensional TV glasses Composed of a left-eye lens and a right-eye wafer, the luminance meter is used to detect the luminance of the central point of the screen of the stereoscopic TV set to be tested observed by human eyes. the

Further, the 3D TV to be tested is installed on a base with rollers, or the luminance meter is installed on a pedestal with rollers, and the distance between the 3D TV to be tested and the luminance meter is adjustable. the

Further, the 3D TV to be tested and the luminance meter are respectively mounted on a base with rollers, and the distance between the 3D TV to be tested and the luminance meter is adjustable. the

Further, the video signal of the TV signal source is binocular full white field signal, and the signal format is HD-SBS (1080/50i) at 50Hz or 60Hz. the

Further, the stereoscopic TV to be tested is an LCD display screen or a PDP display screen. the

The above-mentioned second object of the present invention, the evaluation method of stereoscopic TV image flickering, the technical solution that it realizes comprises the steps: step 1, lay out test system, face the central point of the screen of stereoscopic TV to be tested and arrange luminance meter, put spectrum analyzer Connect to the luminance meter, connect the TV signal source to the stereo TV to be tested and input the left and right full white field signals respectively; step Ⅱ, adjust the signal format of the stereo TV to be tested to the highest supported image quality; step Ⅲ , install the left-eye lens, measure the brightness of the center point of the screen with a luminance meter, and record the luminance value L; step Ⅳ, use a spectrum analyzer to measure the DC component and AC component of the luminance, and record the voltage value V _peak (50Hz) V _peak (0Hz); step Ⅴ, replace the right eye lens, measure the brightness of the center point of the screen with a luminance meter, and record the luminance value L; step Ⅵ, use a spectrum analyzer to measure the DC component and AC component of the luminance respectively, And record the voltage value V _peak (50Hz)V _peak (0Hz); step VII, data analysis, simplify the analysis data according to the detection results of steps III to VI combined with the shutter principle, and obtain the evaluation based on the frame frequency component of the AC signal in the detection brightness formula Among them, E _obs represents the energy of the brightness of the center point of the screen observed by the human eye, and E _pred represents the flicker energy generated by the 50Hz frequency point, b ₀ =12.45184, b ₁ =-0.16032, C ₀ =L means the brightness of the center point of the screen, a=0.5076, b=0.1004, according to the obtained evaluation formula, when the ratio is less than 1, there is no flicker phenomenon in the 3D TV to be tested, and when the ratio is greater than or equal to 1, flicker is visible in the 3D TV to be tested.

Using the evaluation scheme of stereoscopic TV image flickering of the present invention, its remarkable effect compared with the traditional method is embodied in: it can efficiently and accurately evaluate the degree of screen flickering of stereoscopic TV at a suitable viewing distance, and simplifies the process of testing and data analysis. The process provides a reliable reference for stereoscopic TV display technology in terms of flicker processing. the

Description of drawings

Fig. 1 is a schematic diagram of an evaluation device for flickering of stereoscopic television images according to the present invention. the

Detailed ways

According to the characteristics of stereoscopic display, the present invention proposes a shutter-type stereoscopic TV image flicker test and data processing method to evaluate the degree of stereoscopic TV image flicker; , for preliminary assessment of stereoscopic image flicker test comparisons. the

From the general technical solution point of view, the evaluation device for the flickering of the stereoscopic TV image is set in a dark room environment, and the device technical solution for its realization includes: a luminance meter 2, a spectrum analyzer 3 connected to the luminance meter 2, a normal The three-dimensional TV set to be tested 1 set apart from the luminance meter 2 by a certain distance, the three-dimensional TV glasses 5 replaceable between the luminance meter 2 and the three-dimensional TV set to be tested, and the TV signal connected to the three-dimensional TV set to be tested Source 4, wherein the stereoscopic TV glasses are composed of a left-eye lens and a right-eye chip (replaced during evaluation), and the luminance meter is mainly used to detect the brightness of the central point of the stereoscopic TV screen to be tested when the human eye observes it. The stereoscopic TV set to be tested is mainly an LCD display screen or a PDP display screen. the

From the concrete system constitution of this evaluation device, according to the testing method of stereoscopic TV picture quality the present invention flicker evaluation required instrument mainly comprises Konica Minolta (CA2000) high-resolution and two-dimensional color analyzer, Zhizhi ( TG45AX) multi-standard digital TV signal modulator, spectrum analyzer, etc. There are two types of video input signal formats: 60Hz and 50Hz. Considering the typicality of video signals, the input signal format of this experiment is HD-SBS (1080/50i), and all white signals for both eyes are used. the

As an optional optimization, the three-dimensional TV to be tested can be installed on the base 6 with rollers, or the luminance meter can be installed on the base 6 with rollers, and even the three-dimensional TV to be tested and the luminance meter are installed on the base 6 respectively. The base is provided with rollers, and the distance between the stereoscopic TV to be tested and the luminance meter is adjustable. the

Further understand the innovative essence of the present invention from the principles and specific implementation steps of the method for evaluating the flickering of stereoscopic television images of the present invention. the

First of all, it should be understood in principle that flicker is the result of visual perception of light source signals changing over time, which is directly related to the principle of stereoscopic display and the light environment consumers watch. In the early days, there were many tests and researches on flat panel display flicker, and the test systems and data estimation models constructed were relatively objective and quantitative analysis to explain the degree of flicker of flat panel displays. the

The essence of the three-dimensional display flicker test is to measure the change of brightness at different frequencies. Here, in order to improve the evaluation accuracy, its implementation is mainly in a darkroom environment. The brightness of the center point of the screen observed by the left and right glasses is measured by a brightness meter, and a spectrum analyzer is used. The DC component and AC component in the luminance information are measured, and the data is processed to obtain the flickering result. the

From the point of view of the evaluation steps, it mainly includes the following steps, so it can be seen that the evaluation method of the present invention is significantly simplified. the

Step Ⅰ, lay out the test system, set up the luminance meter facing the center of the screen of the stereo TV to be tested, connect the spectrum analyzer to the luminance meter, connect the TV signal source to the 3D TV to be tested and input the left and right full white field signals respectively . the

Step II, adjusting the signal format of the stereoscopic TV set to be tested to the highest supported image quality. the

Step Ⅲ, install the left-eye lens, measure the brightness of the center point of the screen with a brightness meter, and record the brightness value L. the

In step IV, use a spectrum analyzer to measure the DC component and the AC component in the luminance respectively, and record the voltage value V _peak (50 Hz) V _peak (0 Hz).

Step Ⅴ, replace the lens for the right eye, measure the brightness of the center point of the screen with a brightness meter, and record the brightness value L. the

In step VI, the DC component and the AC component in the luminance are respectively measured by a spectrum analyzer, and the voltage values V _peak (50 Hz) and V _peak (0 Hz) are recorded.

Finally, data analysis can be regarded as the last step of the evaluation process. Specifically: E _obs can be used to represent the energy of the brightness of the center point of the screen observed by the human eye, and E _pred can be used to represent the flicker energy generated by different frequency points. Through these two The ratio of the data is E _obs /E _pred , which can describe the flickering degree of the image observed by human eyes. That is to say, when the ratio is less than 1, the flickering phenomenon cannot be seen; when the ratio is greater than or equal to 1, flickering can be seen. For different frequencies, it is specifically expressed as:

$\frac{{\mathrm{E.}}_{\mathrm{obsn}}}{{\mathrm{E.}}_{\mathrm{predn}}}=\frac{A\&Center\; Dot;c_0\&Center\; Dot;\mathrm{AMPn}}{a\·e^{\mathrm{b\; f}}}---\left(1\right)$ in, $\mathrm{AMPn}=\frac{2\left|c_{\mathrm{no}}\right|}{c_0}.$

In fact, according to the characteristics of the stereoscopic TV image quality test, the flickering of the stereoscopic TV image is closely related to the viewing light environment, especially the power frequency lighting environment. The main purpose of the present invention is to detect the flicker phenomenon of the stereoscopic display image, without making a specific degree judgment. Therefore, combined with the working principle of the shutter glasses, in order to simplify the test and data analysis, only the frame frequency component of the AC signal in the brightness can be detected, that is, the 50Hz part. the

So formula (1) can be simplified as: $\frac{{\mathrm{E.}}_{\mathrm{obs}}}{{\mathrm{E.}}_{\mathrm{pred}}}=\frac{A\&Center\; Dot;c_0\·\mathrm{AMP}}{a\&Center\; Dot;e^{\mathrm{b\; f}}}---\left(2\right)$ in, L: brightness); c ₀ =L, $\mathrm{AMP}=\frac{2\&Center\; Dot;V_{\mathrm{peak}}\left(50\mathrm{Hz}\right)}{V_{\mathrm{peak}}\left(0\mathrm{Hz}\right)},$ a=0.5076, b=0.1004.

There is a significant difference in image flicker of two types (LCD and PDP) stereoscopic TVs through testing. The image flicker of PDP screen is higher than that of LCD of the same size, and with the increase of screen size, the flicker has a gentle upward trend. Therefore, 3D TVs have made great breakthroughs in imaging technology and size specifications, and have brought users the enjoyment of 3D images. However, the 3D TV display technology still needs to be improved in terms of flicker processing. the

It can be seen that the innovative technical solution proposed by the present invention can efficiently and accurately evaluate the screen flicker degree of a stereoscopic TV set at a suitable viewing distance, and simplifies the process of testing and data analysis. A reliable reference is provided. the

Claims (6)

1. The evaluation device for the flickering of stereoscopic TV images is arranged in a darkroom environment, and is characterized in that said evaluation device includes: a luminance meter, a spectrum analyzer connected to the luminance meter, a stereoscopic device to be tested at a distance from the luminance meter. TV set, replaceable stereoscopic TV glasses arranged between the luminance meter and the stereoscopic TV to be tested, and a TV signal source connected to the stereoscopic TV to be tested, wherein the stereoscopic TV glasses are composed of a left-eye lens and a right-eye chip , the luminance meter is used to detect the luminance of the central point of the screen of the stereoscopic TV set to be tested observed by human eyes. the 2. according to the evaluation device of the described stereoscopic TV image flickering of claim 1, it is characterized in that: the described stereoscopic TV to be tested is installed on the base of band roller, or described luminance meter is installed on the base of band roller, and described The distance between the stereo TV set to be tested and the luminance meter is adjustable. the 3. The evaluation device for flickering stereoscopic TV images according to claim 1, characterized in that: the stereoscopic television to be tested and the luminance meter are respectively installed on a base with rollers, and the distance between the stereoscopic television to be tested and the luminance meter The distance between them is adjustable. the 4. according to the evaluation device of the described stereoscopic TV image flickering of claim 1, it is characterized in that: the video signal of described TV signal source is the whole white field signal of binocular, and the HD-SBS (1080/50i of signal format is 50Hz or 60Hz ). the 5. The evaluation device for flickering stereoscopic TV images according to claim 1, characterized in that: the stereoscopic TV to be tested is an LCD display or a PDP display. the 6. The evaluation method of stereoscopic TV image flickering is characterized in that comprising steps: Step Ⅰ, lay out the test system, set up the luminance meter facing the center of the screen of the stereo TV to be tested, connect the spectrum analyzer to the luminance meter, connect the TV signal source to the 3D TV to be tested and input the left and right full white field signals respectively ; Step Ⅱ, adjust the signal format of the stereoscopic TV to be tested to the highest supported image quality; Step Ⅲ, install the left-eye lens, measure the brightness of the center point of the screen with a brightness meter, and record the brightness value L; Step IV, using a spectrum analyzer to measure the DC component and AC component in the luminance respectively, and record the voltage value V _peak (50Hz)V _peak (0Hz); Step Ⅴ, replace the right eye lens, measure the brightness of the center point of the screen with a brightness meter, and record the brightness value L; Step VI, using a spectrum analyzer to measure the DC component and AC component in the luminance respectively, and record the voltage value V _peak (50Hz)V _peak (0Hz); Step VII, data analysis, simplify the analysis data based on the detection results from steps III to VI combined with the shutter principle, and obtain the evaluation formula based on the frame frequency component of the AC signal in the detection brightness Among them, E _obs represents the energy of the brightness of the center point of the screen observed by the human eye, and E _pred represents the flicker energy generated by the 50Hz frequency point, b ₀ =12.45184, b ₁ =-0.16032, C ₀ =L represents the brightness of the center point of the screen, a=0.5076, b=0.1004, according to the obtained evaluation formula, when the ratio is less than 1, there is no flickering phenomenon in the three-dimensional TV set to be tested, and when the ratio is greater than or equal to 1, flickering phenomenon can be seen in the three-dimensional TV set to be tested.