JP2005175889A - Sequential scanning converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sequential scanning converter for performing conversion to sequential scanning without having a normal television image part composite a different field to be displayed as one field of sequential scanning for composited video images or lowering the resolution of telecine video images. <P>SOLUTION: On the basis of video signal composite information composited in a video compositing part for compositing two video signals, overlapping fields are detected from the pixel difference of the video signals for each area of the respective video signals obtained from the video signal composite information, whether or not each area is telecine-converted is determined, and sequential scanning conversion is performed to each area of the video signals on the basis of the determination result of telecine conversion for each area. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a progressive scan conversion device that converts synthesized video into progressive scan without fading or reducing resolution.

  In NTSC standard television, images of 60 fields per second are reproduced and displayed as moving images in interlace. With standard movie films and animations, 24 frames per second are played back and displayed as moving images. When this is broadcast on NTSC standard television, the 24 frames per second is converted to 30 frames per second. That is, one frame is divided into two fields by dividing the frame into two fields, and one field is displayed in five fields and the same field is repeatedly displayed to convert to a television format (telecine conversion).

  When converting such a video into a video signal for progressive scanning of 60 fields per second, it is detected from the video signal whether or not it is telecine conversion, and if the detection result is telecine conversion, the film before being telecine converted The same frame is restored and converted into a video signal for sequential scanning so that the output frequency is increased. When it is determined as a normal television video, it is complemented within the field of one field of interlace and the sequential scanning is performed. Convert to one frame. The telecine-converted video detection device is the same when the absolute value of the pixel difference between the image signal of the predetermined field of the video signal and the image signal of the predetermined two fields before is equal to or less than a preset threshold value. It is determined as a field (frame), and when the period in which the same field (frame) appears is 1 field in 5 fields, it is detected as a telecine-converted video (see, for example, Patent Document 1).

  FIG. 3 is an explanatory diagram for explaining the progressive scanning conversion when it is determined as a general telecine conversion. A to E in the figure indicate film frames, which are displayed at 24 frames per second. Further, for example, a0 and a0 ′ are even fields of a telecine-converted interlaced video generated from a film frame A, and a1 is an odd field generated from a film frame A. At this time, a0 'is displayed by repeating a0. Similarly, b0, c0, d0, and e0 are even fields generated from frames B, C, D, and E, respectively, and b1, c1, d1, e1, and e1 ′ are generated from frames B, C, D, and E, respectively. Supports even fields.

  In the progressive scan conversion of the telecine-converted video in FIG. 3, the interlace video signal generated by the telecine conversion is complemented between fields to generate a progressive scan video signal. For example, interlaced video signals a0 and a1 generated by telecine conversion are combined to generate the first field of a progressively scanned video signal. Similarly, the next one field is generated by combining the next a0 'and a1.

FIG. 4 is an explanatory diagram for explaining the progressive scan conversion when it is determined as a normal television image. In the figure, a, b, c, d, e, f, g, and h represent fields of a normal television image, and a ′, b ′, c ′, d ′, e ′, f ′, g ', H' indicates a complementary field generated from a, b, c, d, e, f, g, h. In the case of the normal television image in FIG. 4, since the same field is not repeated as in the telecine-converted image, the complemented image created from one field of the interlaced image is displayed as one field of sequential scanning. . For example, the first video field is generated by synthesizing the complementary video a created from the field a. Similarly, the next one field is generated by synthesizing the complementary video b ′ created from the field b.
JP 2000-324387 A

  In conventional telecine conversion devices, pixel differences are compared in units of frames or fields, so a video signal obtained by synthesizing a plurality of video signals on the same screen and a video signal that has been telecine converted into the video signal and a normal television signal Even if video signals that have been telecine-converted or video signals that have been telecine converted are displayed simultaneously on a parent-child screen that is synthesized with the same field (frame) repetition period shifted, Judgment, normal television image part is synthesized and displayed as one field of sequential scanning by combining different fields, or judged as normal television image and converted from one field of interlaced video to one field of sequential scanning video As a result, the resolution of the telecine video was reduced.

  The present invention synthesizes a field in which a normal television image portion is combined with a synthesized video and displays it as one field of sequential scanning, or progressive scanning conversion that converts to a sequential scanning without reducing the resolution of a telecine video It was made for the purpose of providing a device.

  In order to solve this problem, the progressive scan conversion apparatus of the present invention is an apparatus for converting a video signal obtained by reducing and synthesizing a first video signal and a second video signal into a progressive scan video, and for converting video synthesis information. A video composition unit that synthesizes the originally input first video and the second video, and a video signal output from the video synthesis unit and the video synthesis information are compared to determine whether the first video area or the second video An area discriminating section for discriminating between the input video signal, a frame memory for delaying the input signal by one frame, and detecting and accumulating a difference between the input video signal, the video delayed by one frame, and the first video area. A telecine detection unit for determining whether the first video has been telecine-converted, and the second video by detecting and accumulating the difference between the input video signal, the video delayed by one frame, and the second video area Is telecine converted A telecine detection unit for determining whether or not there is a selector, a selector for switching processing of the two telecine detection units according to the determination of the region determination unit, a telecine sequential scan conversion unit for converting a telecine conversion signal into a sequential scan signal, and a signal other than telecine Is provided with a selector for switching between the two sequential scanning conversion units according to the results of the sequential scanning conversion unit and the telecine detection unit. As a result, even if the first video and the second video are synthesized, it is possible to perform telecine conversion discrimination and sequential scan conversion based on the synthesized video regions, and the synthesized video regions are synthesized. Ordinary television image portions can be combined with different fields and displayed as one field for sequential scanning, or can be converted to sequential scanning without reducing the resolution of the telecine video.

  According to the progressive scan conversion device of the present invention, an overlapping field is detected from the pixel difference of the video signal for each area of each video signal obtained from the video signal synthesis information, and each area is detected based on the detection result. By performing the progressive scan conversion, the original film and other materials are faithfully reproduced for the telecine-converted video signal area, but the video area that has not been telecine-converted is also well-ordered. An advantageous effect that an image can be obtained is obtained.

  Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a progressive scanning conversion apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a video synthesis unit 1 or 2 for synthesizing a first video and a second video. The area discriminators 2 and 3 for comparing the received video signal and the video composition information to discriminate whether the area is the first video area or the second video area are frame memories 3 and 4 for delaying the input signal by one frame. The telecine detectors 4 and 5 for determining whether or not the first video has been telecine converted by detecting and accumulating the difference between the input video signal, the video delayed by one frame, and the first video area are input video The telecine detectors 5 and 6 determine whether the second video has been telecine converted by detecting and accumulating the difference between the signal and the video delayed by one frame and the second video area. signal The telecine progressive scan conversion units 6 and 7 to convert signals other than the telecine, the sequential scan conversion units 7 and 10 to 12 are switched by the region determination of the region determination unit 2, and the selectors 10 to 12 and 13 to 15 are telecine detection units. 4 or the control block of the selector 13 to the selector 15 that is switched by the area determination of the telecine detection unit 5. Each selector switches between SL31 and SL32.

  The operation of the progressive scan converter configured as described above will be described below. First, as shown in FIG. 2, when the video 21 and the video 22 are input by setting the video synthesis unit 1 and the area discrimination unit 2 in FIG. The images are combined to send the video to the area discriminating unit 2. The region discriminating unit 2 discriminates the video 21 and the video 22 based on the previously set combination information. When it is determined that the video image 21 is present, the selector 10 switches the selector 12 to SL31. Then, the input image 21 necessary for obtaining the difference in the telecine conversion determination and the image delayed by one frame are sent to the telecine detection unit 4 to determine the telecine conversion. As a result of this determination, in the case of a video subjected to telecine conversion, the selector 13 is switched to the SL 31 from the selector 13. Thus, the area of the video 21 is converted from the telecine conversion signal to the sequential scanning signal by the telecine progressive scanning conversion unit 6. At this time, if the area of the video 21 is not a telecine conversion signal, the selector 13 is switched to the SL 32 from the selector 13 and is converted into a sequential scanning signal by the sequential scanning conversion unit 7 as a normal television signal.

When the image input to the area discriminating unit 2 is discriminated as the video 22 area, the selector 10 switches the selector 12 to SL 32 at the same time. Then, the input image 22 necessary for obtaining the difference of the telecine conversion determination and the image delayed by one frame are sent to the telecine detection unit 5 to determine the telecine conversion.
As a result of this determination, in the case of a video subjected to telecine conversion, the selector 13 is switched to the SL 32 from the selector 13. Thus, the area of the video 22 is converted from the telecine conversion signal to the sequential scanning signal by the telecine progressive scanning conversion unit 6. At this time, if the area of the video 22 is not a telecine conversion signal, the selector 13 is switched to SL32 from the selector 13, and the sequential scanning conversion unit 7 converts it into a sequential scanning signal as a normal television signal. Next, when the image inputted to the area discriminating unit 2 is discriminated again as the area of the video 21, when the selector 10 is switched to the SL 31 at the same time, the input video 21 and 1 necessary for obtaining the difference in the telecine conversion judgment are obtained. When the frame-delayed video is sent to the telecine detection unit 4 and determined as a telecine conversion signal, the telecine sequential scan conversion unit 6 performs sequential scan conversion. This process is repeated.

  As described above, according to the present embodiment, when an interlaced scan video obtained by synthesizing different video signals is converted into a progressive scan video having a different display speed, a video is obtained for each area of each video signal obtained from the video signal synthesis information. It is possible to detect an overlapped field from the pixel difference of the signal and change the conversion method of sequential scanning for each region based on the detection result.

  The progressive scan conversion device according to the present invention can be applied to a DVD recorder or an HDD recorder that can synthesize and sequentially convert two video signals such as a decoded video from a storage medium and a video signal from a TV tuner, and sequentially convert the output. .

The figure which shows the system of the progressive scanning conversion apparatus by one embodiment of this invention The figure which shows the example of the screen which synthesize | combined the video signals 1 and 2 The figure which shows the progressive scanning conversion when it judges with general telecine conversion The figure which shows the progressive scanning conversion at the time of determining with a general normal television signal

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image composition part 2 Area | region determination part 3 Frame memory 4,5 Telecine detection part 6,7 Sequential scanning conversion part 10,11,12,13,14,15 selector

Claims (1)

The video composition unit that synthesizes the first video and the second video input based on the video synthesis information, and the video signal output from the video synthesis unit and the video synthesis information are compared to determine whether the first video area An area discriminating unit for discriminating whether the area is the second video area, a frame memory for delaying the input signal by one frame, and detecting a difference between the input video signal and the video delayed by one frame and the first video area A telecine detector that determines whether or not the first video has been telecine converted by accumulating, and detecting and accumulating the difference between the input video signal, the video delayed by one frame, and the second video area A telecine detector that determines whether or not the second video has been telecine-converted, a selector that switches between processing of the two telecine detectors based on the determination of the region determiner, and a scanning signal sequentially from the telecine conversion signal Sequential scanning conversion apparatus comprising: a telecine for progressive scan conversion unit for converting, by the results of a telecine detector sequential scanning conversion unit signals other than telecine selector to switch between the two progressive scan conversion portion.

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