JPH0258993A - Stereoscopic television signal processor - Google Patents

Abstract

PURPOSE:To prevent the eyestrain of an observer by correcting a video signal so as to automatically make the characteristic of one video signal coincide with the characteristic of the outer video signal. CONSTITUTION:The title processor is equipped with mean value calculating parts 1 and 2, dynamic range calculating parts 3 and 4, and a correcting circuit 5, makes either the video signal for the left eye or the video signal for the right eye into a reference, corrects the other video signal, which is not made into the reference, with the reference, and makes the characteristics of the video signals for the right and left eyes coincide with each other. Namely, the video signal can be corrected in the correcting circuit 5 so as to automatically make the characteristics of the video signals for the right and left eyes coincide with each other even when the difference in the characteristics of the video signals occurs based on the difference in the characteristics including two television cameras for the right and left eyes. Thus, a stereoscopic image to give the minimum eyestrain to the observer can be reproduced and displayed.

Description

[Detailed Description of the Invention] [Summary] Regarding a stereoscopic television signal processing device that matches the characteristics of video signals for left and right eyes, the object is to match the characteristics of video signals for left and right eyes with a relatively simple configuration. an average value calculation unit that calculates the average brightness level of the left eye video signal and the right eye video signal, and a dynamic range that calculates the dynamic range of the left eye video signal and the right eye video signal. a calculation unit, which one of the left eye video signal and the right eye video signal is determined based on the average luminance level calculated by the average value calculation unit and the dynamic range calculated by the dynamic range calculation unit; A correction circuit is provided to match the average luminance level and dynamic range of one of the video signals to the average luminance level of the other video signal.

[Industrial application field]

The present invention relates to a stereoscopic television signal processing device that matches the characteristics of video signals for left and right eyes.

The 3D television system is well known, in which video signals captured by two television cameras are transmitted, and on the receiving side, the images for the left eye and the image for the right eye are separated using filters, shutters, etc., and viewed as a 3D image. . In such a 3D television system, two television cameras are used to capture a single image, which causes variations in the video signals for the left and right eyes, resulting in a reduction in the quality of the reproduced 3D image. Therefore, it is desired to prevent such quality deterioration.

[Conventional technology]

For example, as shown in FIG. 3, television cameras 21 and 22 are arranged corresponding to the left eye and the right eye, and image the subject 20, and add the respective video signals to the transmission processing section 23.
For example, the signals are alternately switched and multiplexed for each field, and sent to the transmission path. On the receiving side, the reception processing section 24 performs reception processing, and the received video signal is added to and displayed on the display device 25. In this case, the display device 25 alternately displays left-eye images and right-eye images for each field.

If this display device 25 is, for example, a display device using a projection display method as shown in FIG. 4, the cathode ray tube 32 is controlled from the video control device 3.3 according to the received video signal,
The display contents of the cathode ray tube 32 are projected onto the screen 31.

In this case, images for the left eye and images for the right eye are alternately displayed for each field, for example. The observer also wears glasses 34, has shutters on the left and right sides of the glasses 34, applies a shutter control signal in accordance with the synchronization signal from the video control device 33 to the glasses 34, and alternately opens and closes the left and right shutters. As a result, screen 31
Since the image for the left eye and the image for the right eye projected on the screen can be observed separately, a three-dimensional effect can be obtained.

In addition, two cathode ray tubes are provided, one for the left eye and one for the right eye, and the images are projected onto a screen through filters of different colors or polarization characteristics, and the viewer has a filter with characteristics corresponding to the filters. A method is also known in which the images for the left and right eyes are observed separately by wearing glasses to obtain a three-dimensional effect.

Another method is to use a single cathode ray tube to display images in different colors for the left and right eyes, and to obtain a three-dimensional effect by wearing filter glasses and viewing the left and right images separately. Are known.

[Problem to be solved by the invention]

As mentioned above, the stereoscopic television system uses two television cameras 21 and 22, one for the left eye and one for the right eye, and their optical characteristics such as lenses and electrical characteristics such as imaging sensitivity are As a result, the characteristics of the video signals for the left and right eyes differ. Due to these differences in the characteristics of video signals, the color and brightness of the reproduced images for the left and right eyes on the receiving side are different, resulting in eye fatigue for the viewer in a relatively short period of time. was there.

Therefore, in order to match the characteristics of the video signals for the left and right eyes,
The optical system and electrical system must be adjusted, but even if such adjustment is made, the adjustment will deviate due to temperature changes and changes over time, resulting in the aforementioned problem.

An object of the present invention is to match the characteristics of zero-video signals for left and right eyes with a relatively simple configuration.

[Means to solve the problem]

The stereoscopic television signal processing device of the present invention automatically corrects the characteristics of one video signal to match the characteristics of the other video signal, and will be described with reference to FIG.

Average value calculation units 1 and 2 that calculate the average brightness level of the left eye video signal and the right eye video signal, and a dynamic range that calculates the dynamic range of the left eye video signal and the right eye video signal. Based on the average luminance level calculated by the calculation unit 3.4, the average value calculation unit 1.2, and the dynamic range calculated by the Guiminac range calculation unit 3.4, the video signal for the left eye and the right eye are calculated. A correction circuit 5 is provided for making the average luminance level and dynamic range of the other video signal match, using one of the video signals as a reference.

[Effect]

The correction circuit 5 calculates the average value from the left and right eye video signals.
．． 2 and the dynamic range calculation units 3 and 4, the correction process is performed based on the Heiichi brightness level and dynamic range calculated by the dynamic range calculation units 3 and 4, and the average brightness of the video signal for the left eye and the video signal for the right eye. By matching the levels, the average brightness of the reproduced image for the left eye and the reproduced image for the right eye will be equal, but if the dynamic ranges are different, the peak brightness will be different. Therefore, the dynamic ranges are also matched, which means that the characteristics of the video signals for the left and right eyes match, which reduces eye fatigue even when images for the left and right eyes are alternately switched and observed. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, and 11.1
2 is an average value calculation section, 13.14 is a dynamic range calculation section, 15 is an arithmetic section, 16 is a subtracter, and 17 is an adder. The computation section 15, subtracter I6, and adder I7 constitute the correction circuit 5 in FIG. 1, and the functions of each section may be realized by a program-controlled digital signal processing processor or the like. It is possible.

Video signals of channels CHI and CH2 (for left eye, for right eye) are input, and the average luminance level is calculated in the average value calculation section 11.12 for each field of the video signal, and the dynamic range calculation section In 13.14, find the dynamic range. The average brightness level can be obtained by a normal average value calculation process. Furthermore, the dynamic range can be obtained by determining the difference between the maximum brightness level and the minimum brightness level.

Let the video signal of channel CHI be A, the video signal of channel CH2 be B, and the average brightness level signal of video signal A be γ,
If the dynamic range signal is α, the average brightness level signal of video signal B is δ, and the dynamic range signal is β, then
The subtracter 16 performs subtraction of (B-δ), and the calculation unit 15 performs the calculation of (B-δn×(α/β).
Adder 17 performs addition of (B-δ)×(α/β)10γ.

For example, if the average luminance level and dynamic range of video signals A and B are equal, the relationship is α-β, γ-δ, and the subtracted amount in the subtracter 16 is added in the adder 17, and Since the calculation unit 15 has α/β-1, the average luminance level and dynamic range of the video signal B are output as they are.

When γ=δ and α=2β, the output signal (B-δ) of the subtracter 16 is doubled in the arithmetic unit 15 to expand the dynamic range, which is the same as the dynamic range of the video signal A. Then, in the adder 17, γ of T=δ is added, and the resultant signal is outputted from the adder 17 as a video signal of the channel CH2 whose dynamic range is equal to the average luminance level of the video signal A.

If γ=0.8δ and α−β, the subtracter 16 subtracts (B−δ), and the arithmetic unit 15 calculates
(α/β)-1, so the adder 17 inputs (B
−δ)+0.8δ=B −0,2δ is calculated, and the average brightness level of video signal B is corrected to be equal to the average brightness level of video signal A.

As described above, the average luminance level and dynamic range of the video signal B of channel CH2 can be made equal to that of the video signal A and output using the video signal A of channel CHI as a reference.

〔Effect of the invention〕

As explained above, the present invention includes the average value calculation section 1.2, the dynamic range calculation sections 3.4 and 1, and the correction circuit 5, and the present invention includes the average value calculation section 1.2, the dynamic range calculation sections 3.4 and 1, and the correction circuit 5. The video signal for the left and right eyes is corrected using one of them as a reference to match the characteristics of the video signal for the left and right eyes. The correction circuit 5 is configured to automatically match the characteristics of the video signals for the left and right eyes even if there is a difference in signal characteristics.
Since the correction can be made with , there is an advantage that a stereoscopic image can be reproduced and displayed with less eye fatigue. Furthermore, when performing band compression processing by calculating the difference between fields, since the characteristics of the video signals for left and right eyes match each other in field units, the difference value becomes small and band compression becomes easy.

[Brief explanation of the drawing]

- Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is an explanatory diagram of a stereoscopic television system, and Fig. 4 is an explanatory diagram of a projection display system. 1.2 is an average value calculation section, 3.4 is a Guinamiso clean range calculation section, and 5 is a correction circuit.

Claims (1)

[Scope of Claims] An average value calculation unit (1, 2) that calculates the average brightness level of a video signal for the left eye and a video signal for the right eye, and a video signal for the left eye and the video signal for the right eye. a dynamic range calculation unit (3, 4) that calculates the dynamic range with the signal, an average luminance level calculated by the average value calculation unit (1, 2), and a dynamic range calculation unit (3, 4) that calculates the dynamic range with respect to the signal; a correction circuit that matches the average luminance level and dynamic range of one of the left-eye video signal and the right-eye video signal based on the range of the other video signal; (5) A stereoscopic television signal processing device comprising: