VIDEO SIGNAL PROCESSING APPARATUS AND VIDEO SIGNAL PROCESSING METHOD

• US 20130229498A1
• Filed: 03/13/2012
• Published: 09/05/2013
• Est. Priority Date: 03/05/2012
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: YANO, Natsumi, IWAKURA, Noriyuki
• Granted Patent: US 8,896,674 B2
• Time in Patent Office: Days
• US Class Current: 348/51
• CPC Class Codes: H04N 13/122 Improving the 3D impression of stereoscopic images by modifying image signal contents, e.g. by filtering or adding monoscopic depth cues H04N13/128 takes precedence

Abstract

An image-luminance transformation section receives a video signal on a frame basis, and transforms the video signal into a luminance signal in each frame. A crosstalk ratio setting section sets a crosstalk ratio. An amount-of-correction calculation section calculates a correction luminance signal, for correcting a video signal of a frame n, using a luminance signal of a frame n−1, a luminance signal of the frame n, and the crosstalk ratio. A luminance-image transformation section transforms the correction luminance signal into a correction video signal. A correction section adds the correction video signal to the video signal of the frame n to generate a video signal of the frame n in which the amounts of crosstalk have been corrected.

Claims

1. A video signal processing apparatus for processing a video signal for displaying an image in which right-eye and left-eye images having a parallax alternate every frame, the video signal processing apparatus comprising:

a first transformation section configured to transform the video signal into a luminance signal;

a setting section configured to set a crosstalk ratio based on amounts of crosstalk occurring in two successive frames;

a calculation section configured to, on the basis of the luminance signal of a current frame output from the first transformation section and the crosstalk ratio, calculate a correction luminance signal for correcting an amount of crosstalk occurring in a next frame following the current frame;

a second transformation section configured to transform the correction luminance signal to generate a correction video signal; and

a correction section configured to add the correction video signal to a video signal of the next frame.

2. The video signal processing apparatus according to claim 1, wherein

the calculation section calculates as the correction luminance signal a value obtained by subtracting an amount of crosstalk occurring in the current frame in each pixel from an amount of crosstalk occurring in the next frame in the pixel.

3. The video signal processing apparatus according to claim 1, further comprising

a retention section configured to retain a maximum amount of crosstalk occurring in each frame, wherein

the calculation section calculates as the correction luminance signal a value obtained by subtracting an amount of crosstalk occurring in the current frame in each pixel from the retained maximum amount of crosstalk occurring in the current frame.

4. The video signal processing apparatus according to claim 1, further comprising:

a determination section configured to determine, in accordance with the luminance signal of each frame, whether or not a correction luminance signal including a negative luminance value can be used; and

a retention section configured to retain a maximum amount of crosstalk occurring in each frame, wherein

the calculation section;

if the determination section has determined that the correction luminance signal including a negative luminance value can be used, calculates as the correction luminance signal a value obtained by subtracting an amount of crosstalk occurring in the current frame in each pixel from an amount of crosstalk occurring in the next frame in the pixel; and

if the determination section has determined that the correction luminance signal including a negative luminance value cannot be used, calculates as the correction luminance signal a value obtained by subtracting the amount of crosstalk occurring in the current frame in each pixel from the retained maximum amount of crosstalk occurring in the current frame.

5. The video signal processing apparatus according to claim 2, wherein

the calculation section multiplies a luminance value of the luminance signal in each pixel by the crosstalk ratio to obtain on a pixel basis an amount of crosstalk occurring in each frame.

6. The video signal processing apparatus according to claim 3, wherein

the calculation section multiplies a luminance value of the luminance signal in each pixel by the crosstalk ratio to obtain on a pixel basis an amount of crosstalk occurring in each frame.

7. The video signal processing apparatus according to claim 4, wherein

the calculation section multiplies a luminance value of the luminance signal in each pixel by the crosstalk ratio to obtain on a pixel basis an amount of crosstalk occurring in each frame.

8. The video signal processing apparatus according to claim 4, wherein

the determination section obtains on a pixel basis a difference value obtained by subtracting the amount of crosstalk occurring in the current frame from the luminance signal of the next frame, and, if the number of pixels in which the difference values are negative is greater than a predetermined threshold, determines that the correction luminance signal including a negative luminance value cannot be used.

9. The video signal processing apparatus according to claim 1, wherein

the setting section sets the crosstalk ratio for each frame of the video signal or for each pixel in the frame.

10. The video signal processing apparatus according to claim 1, wherein

the setting section dynamically sets the crosstalk ratio on the basis of a video signal to be output to a display.

11. A video signal processing method performed by an apparatus for processing a video signal in which right-eye and left-eye images having a parallax alternate every frame, the video signal processing method comprising:

a first transformation step of transforming the video signal into a luminance signal equivalent to a luminance corresponding to characteristics of a display for displaying a stereoscopic image;

a step of, on the basis of the luminance signal of a current frame output in the first transformation step and a crosstalk ratio based on amounts of crosstalk occurring in two successive frames, calculating a correction luminance signal for correcting an amount of crosstalk occurring in a next frame following the current frame;

a second transformation step of performing on the correction luminance signal a transformation inverse to the transformation performed in the first transformation step, to generate a correction video signal; and

a step of adding the correction video signal to a video signal of the next frame.