JP2577745B2 - Receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus applied to receiving a video signal such as a telecine image created from a movie film.

[Prior Art] As a conventional television signal receiving apparatus, the number of scanning lines is large.
2. Description of the Related Art A receiving apparatus using the NTSC system for performing 525 lines, 30 frames / 60 fields / second, 2: 1 interlace scanning, is known.

[Problems to be Solved by the Invention] In recent television receivers, scanning line interpolation is executed with the advance of digital signal processing technology and digital IC technology, and the number of scanning lines is 525, 60 fields / 60. The vertical resolution is improved by reproducing a frame / second progressively scanned image. As the interpolating means for the scanning lines, inter-field interpolating means for interpolating from the previous field and intra-field interpolating means for interpolating from upper and lower scanning lines in the same field are employed.

By the way, looking at the above two scanning line interpolation means, in the case of a still image, although the vertical resolution can be improved as predetermined by the interfield interpolation means,
In the case of a moving image, a double image is generated. Therefore, in the case of a moving image, in-field interpolation means is generally employed. However, with this in-field interpolation means, improvement in vertical resolution cannot be achieved. Even if the interpolation means is switched between a still image and a moving image, the discriminating operation by the motion detecting circuit for discriminating between the still image and the moving image is not perfect, and this also leads to the improvement of the vertical resolution as specified. Can not achieve.

As described above, under the conditions of the current NTSC system and its transmission band, it is difficult to improve the vertical resolution of all signals including moving images, even if scanning line interpolation is performed.

The present invention has been made in order to solve the above problems, and uses the same screen as an information source from each screen of image information to be transmitted having a smaller number of screens per second than the number of screens per second on the receiving side. At the receiving end, when converting and transmitting so as to obtain a predetermined screen group, each screen in the received image information is obtained from the same screen of the image information before being converted to be transmitted. Reception can be easily determined whether or not it is possible, and furthermore, the vertical resolution can be reliably improved by enabling easy and accurate scanning line interpolation for all image information including moving images. It is intended to provide a device.

[Means for Solving the Problems] The receiving apparatus according to the present invention has been converted from each screen of image information to be transmitted so as to obtain a predetermined screen group using the same screen as an information source, and transmitted. By receiving a signal, in a receiving apparatus capable of transmitting the image information having a number of screens per second smaller than the number of screens per second on the receiving side, the received signal is multiplexed with the transmitted signal, and the predetermined screen group is An information signal indicating that the image information is obtained from the same screen is received, and based on the information signal in the received signal, the same screen of the image information is selected from the received signals. In which a group of screens having the information source as an information source is determined.

[Operation] In the receiving apparatus according to the present invention, reception is performed based on an information signal indicating that a predetermined screen group in a received signal is obtained from the same screen of image information to be transmitted. Screen groups each having the same screen of the image information as an information source are determined from the signals thus obtained.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic signal diagram for explaining a basic concept of a transmitting side and a receiving side of a television signal system according to an embodiment of the present invention.

Generally, one of the basic requirements for a system conversion system for telecine is conversion of the number of images per second between a film system and a television system. The normal running speed of the film on the transmitting side is 24 frames per second. Generally, the first frame corresponds to the TV 3 field, the next frame corresponds to the TV 2 field, and this combination is repeated every 1/12 second. The method has been adopted.

(1) and (2) of FIG. 1 schematically show the above method, and (A), (B), (C), and (C) of the film frame shown in (1) of FIG. Corresponding to the continuous screens of (D), (E),..., The image information of the first frame (A) is represented by the content of each field in the NTSC system shown in (2) of FIG. The signal of the odd scan line (A) is transmitted by the field (A1), the signal of the even scan line (A) is transmitted by the field (A2), and the signal (A3) is transmitted by the field (A3). The signal of the odd-numbered scanning line of A) is transmitted. The image information of two frames (B) is represented by (B) in a field (B1).
The signal of the odd-numbered scanning line of (B) is transmitted by the field (B2). Less than,
The frame image information of (C), (D), (E),... After the third frame also transmits the signal of the odd-numbered scanning line and the signal of the even-numbered scanning line in the same manner as described above.

On the other hand, on the receiving side, (A1), (A2), (A3), (B
1), (B2),... At this time, it is possible to reproduce a screen with 525 scanning lines (A) by two fields (A1) and (A2), and a scanning line (B) by two fields (B1) and (B2). It can reproduce several 525 screens. That is, on the receiving side, in response to the three fields (A1), (A2), and (A3) sent, the output signal of the frame (A) of 525 scanning lines is output in three frames. And sent again (B
Corresponding to the two fields (1) and (B2), the output signal of the frame (B) progressive scanning with 525 scanning lines is
Output frames. Hereinafter, (C), (D), (E), ...
By performing the same processing as above, a reproduced image having 525 scanning lines and 60 frames / 60 fields / sec can be obtained on the receiving side as shown in FIG. 1 (3).

However, on the receiving side, it is very difficult as a practical matter to determine which field uses the same screen as an information source. Therefore, in the present invention, the first
In addition to the processing of (1), (2) and (3) in the figure, the transmitting side further multiplexes an information signal as shown in (4) in FIG. 1 with a television signal and transmits it. This information signal is a binary information signal of a high level and a low level. On the receiving side, three fields (A1), (A2), and (A3) are obtained from the same screen. While making sure that the two fields (B1) and (B2) are signals obtained from the same screen,
As shown in (3) of FIG. 1, the number of fields belonging to the field group can be repeatedly displayed.

The information signal as described above is multiplexed and transmitted to an unused line in a vertical blanking period of the television signal.

FIG. 2 shows an example of a signal transmission system capable of detecting a field group using the same screen as an information source.
In the figure, the information signal is multiplexed on the 19th H in the vertical blanking period. From this signal, the field (A1),
The receiving side can detect that (A2) and (A3) use the same screen as the information source, and that the fields (B1) and (B2) use the same screen as the information source.

In the above embodiment, the reproduction of a telecine image created from a film composed of 24 frames per second has been described.
The present invention is not limited to this, and can be generally applied to any image having no information limit of less than 30 frames per second.

In the above-described embodiment, as a method of transmitting an information signal that can detect a group of fields using the same image as an information source, a method of multiplexing an unused line in a vertical blanking period is used. But not all multiplexing methods.

Further, in the above embodiment, an information signal capable of detecting a group of fields using the same image as an information source is simply multiplexed as binary information of a high level and a low level within a vertical blanking period. May be multiplexed as an information signal for which error correction can be performed in consideration of signal degradation or the like.

[Effects of the Invention] As described above, according to the receiving apparatus of the present invention, each screen of image information to be transmitted is converted so as to obtain a predetermined screen group using the same screen as an information source and transmitted. By receiving the received signal, in a receiving device capable of transmitting the image information having the number of screens per second smaller than the number of screens per second on the receiving side, multiplexed with the transmitted signal, the predetermined screen group Each of which receives an information signal indicating that the image information is obtained from the same screen of the image information, and a predetermined screen group in the received signal is obtained from the same screen of the image information. Are determined from the received signals based on the information signal indicating that the same screen of the image information is used as an information source. This has the effect that the face group can be easily identified. Furthermore, scanning line interpolation can be performed accurately and easily for each same screen group, accurate scanning line interpolation can be performed for all image information including moving images, and an improvement in vertical resolution can be reliably achieved. It has the effect of.

[Brief description of the drawings]

FIG. 1 is a schematic signal diagram showing the basic concept of a television signal transmission system according to an embodiment of the present invention, and FIG. 2 explains a signal transmission system capable of detecting a field group using the same screen as an information source. It is a signal waveform diagram. (A), (B), (C), (D), (E) ... The screen of the film frame, (A1), (A2), (A3), (B1),
(B2), (C1), (C2), (C2) ... Field contents. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

(57) [Claims] 1. A receiving side receives a signal converted and transmitted from each screen of image information to be transmitted so as to obtain a predetermined screen group having the same screen as an information source. In a receiving apparatus capable of transmitting the image information having a smaller number of screens per second than the above, it is multiplexed with the transmission signal, and the predetermined screen group is obtained from the same screen of the image information. Receiving the information signal representing the image information, and determining a screen group using the same screen of the image information as an information source from the received signals based on the information signal in the received signal. Receiver. 2. The method according to claim 1, wherein the converted, transmitted, and received signals are television signals, and the number of screens per second on the receiving side is the number of fields per second of the television signals. The receiving device according to the paragraph.