Television – Basic receiver with additional function – Multimode
Reexamination Certificate
1998-10-20
2001-02-20
Lee, Michael (Department: 2714)
Television
Basic receiver with additional function
Multimode
C348S556000, C348S706000
Reexamination Certificate
active
06191824
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a video signal processing apparatus that processes both a progressive scanning video signal and a conventional interlace scanning video signal.
2. Description of the Related Art
Generally, when a 24 fps (frames per second) movie, for example, is converted into a video signal so-called telecine signal, two or three fields of the video signal are composed of one frame of the movie. This format is referred to as 3-2 pulldown format. When such a video signal is displayed on a progressive scanning TV receiver, with information that represents which field is generated with which frame, scan lines can be properly interpolated. Thus, the picture quality of the video signal is improved. FIG.
9
(
a
) shows a scan line interpolating process in the case of a 24 fps film. FIG.
9
(
b
) shown a scan line interpolating process in the case of a 30 fps film.
With signals of two fields generated with the same frame, an inter-field interpolating process is performed. To do that, it is necessary to know which field is generated with which frame. When the current field is generated with the same frame as the preceding field, “same frame” information is transmitted as pulldown information. In contrast, when the current field is generated with the different frame as the preceding field, “different frame” information is transmitted as pulldown information.
A pulldown transmitting method has been defined in “Video ID signal transmitting method”, Engineering Report EIAJ CPR-1204, Electronic Industries Association of Japan, May 1997. According to the method, the pulldown information is transmitted as “same frame” information when the current field is generated with the same frame as the preceding field. In contrast, the puildown information is transmitted as “different frame” information when the current field is generated with the different frame as the preceding field. With the pulldown information, a telecine video signal can be converted into a progressive scanning signal with high quality.
However, according to the CPR-1204 standard, it is not necessary to transmit pulldown information in each field. In addition, another information can be transmitted along with the pulldown information. In this case, such an area should be sequentially processed.
Thus, when a telecine signal is continuous, no problem takes place. However, when there are both a telecine signal and a conventional interlace scanning signal, the pulldown information cannot be effectively used.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a video signal processing apparatus that effectively performs a progressive scanning process even if both a progressive scanning video signal and a conventional interlace scanning video signal are present.
A first aspect of the present invention is a video signal processing apparatus, comprising a means for determining whether an input signal is a progressive scanning first video signal or an interlace scanning second video signal and generating a determination signal corresponding to the determined result, a first converting means for converting the first video signal into an interlace scanning third video signal when the first video signal has been input, a means for selecting the second video signal and outputting a fourth video signal when the determination signal represents that the second video signal has been input and for selecting the third video signal and outputting a fourth video signal when the determination signal represents that the first video signal has been input, a second converting means for converting the fourth video signal into a progressive scanning signal corresponding to motion information of the fourth video signal when the fourth video signal is the second video signal, a third converting means for converting the fourth video signal into a progressive scanning signal corresponding to the first converting means when the fourth video signal is the third video signal, and a means for selecting an output signal of the second converting means and outputting a fifth video signal when the determination signal represents that the second video signal has been input and for selecting an output signal of the third converting means and outputting a fifth video signal when the determination signal represents that the first video signal has been input.
A second aspect of the present invention is a video signal processing apparatus, comprising a means for determining whether an input signal is a progressive scanning first video signal or an interlace scanning second video signal and generating a determination signal corresponding to the determined result, a first converting means for converting the first video signal into an interlace scanning third video signal when the first video signal has been input, a means for generating a field determination signal that represents that the next field of the third video signal are generated with the same frame as the first video signal, a means for selecting the second video signal and outputting a fourth video signal when the determination signal represents that the second video signal has been input and for selecting the third video signal and outputting a fourth video signal when the determination signal represents that the first video signal has been input, a means for generating a control signal with the determination signal and the field determination signal, the control signal containing the information of both the determination signal and the field determination signal, a second converting means for converting the fourth video signal into a progressive scanning signal corresponding to motion information of the fourth video signal when the fourth video signal is the second video signal, a third converting means for converting the fourth video signal into a progressive scanning signal corresponding to the first converting means with the field determination signal contained in the control signal when the fourth video signal is the third video signal, and a means for selecting an output signal of the second converting means and outputting a fifth video signal when the determination signal contained in the control signal represents that the second video signal has been input and for selecting an output signal of the third converting means and outputting a fifth video signal when the determination signal contained in the control signal represents that the first video signal has been input.
A third aspect of the present invention is a video signal processing apparatus, comprising a means for determining whether an input signal is a progressive scanning first video signal or an interlace scanning second video signal and generating a determination signal corresponding to the determined result, a first converting means for converting the first video signal into an interlace scanning third video signal when the first video signal has been input, a means for generating a field determination signal that represents that the next field of the third video signal are generated with the same frame as the first video signal, a means for selecting the second video signal and outputting a fourth video signal when the determination signal represents that the second video signal has been input and for selecting the third video signal and outputting a fourth video signal when the determination signal represents that the first video signal has been input, a means for generating a control signal containing the information of both the determination signal and the field determination signal, and a means for processing the fourth video signal with the field determination signal contained in the control signal when the determination signal contained in the control signal represents that the first video signal has been input.
Thus, even if both a progressive scanning telecine signal and an interlace scanning video signal are present, for example, for the telecine signal, a process with the pulldown information is performed. For the interlace scanning vide
Kabushiki Kaisha Toshiba
Lee Michael
Pillsbury Madison & Sutro LLP
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