JPH05328312A - Scanning conversion system - Google Patents

Abstract

PURPOSE:To improve a screen oscillation phenomenon in the elimination of frame or still image reproduction without reducing resolution in a scanning conversion system for converting a double speed non-interlace signal into an interlace signal. CONSTITUTION:An image for one frame obtained by photographing an object is outputted as a double speed non-interlace signal 1 having a 60Hz frame period and an odd numbered line signal 2 and an even numbered line signal 3 are extracted from the signal 1 as an odd numbered field signal 4 and an even numbered field signal 5. A signal by one frame is formed from those signals 4, 5 and outputted as an interlace signal 6 with a 30Hz frame period and the signal 6 is regenerated by an NTSC type image reproducing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning conversion system for converting a double-speed non-interlaced signal into an interlaced signal, and more specifically, a 525-line non-interlaced signal at a frame period of 60 Hz from an image obtained by photographing a subject. The present invention relates to a scan conversion system for obtaining a double speed non-interlaced signal by performing interlaced scanning and converting the signal into an NTSC interlaced signal.

[0002]

2. Description of the Related Art In transmitting an image obtained by photographing a subject, it is necessary to drop the video frame and transmit the image due to the restriction of the transmission path such as satellite communication. There is. In such a case, when a moving image is reproduced on the receiving side, in image transmission using the NTSC system or the like, a screen vibration phenomenon occurs due to a time axis shift between an odd field and an even field. The same applies to still image reproduction (transmission).
For this reason, it is necessary to improve the vibration phenomenon of the screen in dropping a moving image or reproducing a still image.

In the conventional image transmission using the NTSC system, when an image is transmitted by dropping a video frame, only an odd field is transmitted and an even field is interpolated and reproduced on a receiving side to obtain an image. We are trying to improve the vibration phenomenon of the screen caused by dropping the saw.

[0004]

However, in the case where the even side field is reproduced by interpolation on the receiving side,
There is a problem that the vertical resolution is lowered, and the advent of a good transmission method in such image transmission has been desired.

The present invention has been made in view of such a point of view. By generating an interlaced signal from a double-speed non-interlaced signal and transmitting image information, the frame dropping or the still image reproduction is performed without lowering the resolution. The main purpose of the present invention is to provide a scan conversion system which is designed to improve the vibration phenomenon of the screen.

[0006]

The present invention uses a camera capable of double speed non-interlaced scanning with a frame cycle of 60 Hz, and non-interlacedly scans one frame of an image obtained by photographing a subject with 525 lines. Then, the image is output as a double-speed non-interlaced signal 1 having a frame cycle of 60 Hz, an odd-line signal 2 and an even-line signal 3 are extracted from the output double-speed non-interlaced signal 1, and they are output as an odd-field signal 4. An even field signal 5 is generated, and a signal for one frame is generated from the odd field signal 4 and the even field signal 5 and output as an interlace signal 6 having a frame period of 30 Hz, and the interlace signal 6 is reproduced in an NTSC system image. It is a scanning conversion system that consists of reproducing on the device.

In the above system, when the frame drop or the still image is reproduced, when the odd-numbered line signal 2 and the even-numbered line signal 3 are extracted from the double-speed non-interlaced signal 1, the double-speed non-interlaced signal 1 is extracted. The signal 2 of the odd line and the signal 3 of the even line are extracted from the same frame every other one or a plurality of frames, and are taken as the signal 4 of the odd field and the signal 5 of the even field, respectively.

Further, in the above method, when the frame drop or the still image is not reproduced, that is, the image is reproduced as a moving image, the double speed non-interlaced signal 1 to the odd line signal 2 and the even line signal When 3 is taken out, the odd line signal 2 and the even line signal 3 are taken out alternately for each frame of the double speed non-interlaced signal 1 to be the odd field signal 4 and the even field signal 5, respectively. Good.

[0009]

According to the present invention, the odd line signal 2 and the even line signal 3 are extracted from the double speed non-interlaced signal 1 of 525 lines with a frame period of 60 Hz. Then, from these signals 2 and 3, an interlace signal (NTSC signal) 6 having a frame period of 30 Hz and composed of an odd field signal 4 of 262.5 lines and an even field signal 5 of 262.5 lines is generated. ..

Therefore, since the double-speed non-interlaced signal 1 can be reproduced by using the normal image transmission device of the NTSC system, if a camera capable of double-speed non-interlaced scanning is used, the rest of the conventional image transmission is performed. The device can be used to replay captured images without degrading vertical resolution.

In addition, when the frame is dropped or the still image is reproduced, the signal 2 of the odd line and the signal 3 of the even line are extracted from the same frame. Therefore, since the time axis of the signal 4 of the odd number field and the signal 5 of the even number field are the same, it is possible to improve the vibration phenomenon of the screen without dropping the vertical resolution when dropping the video frame or reproducing the still image. It will be possible.

On the other hand, when the frame dropping or the still image reproduction is not performed, the odd line signal 2 and the even line signal 3 are alternately taken out for each frame. In other words, from the 525th line of the first frame, the signal (2
62.5 lines) 2 and even line signals (262.5 lines) 3 are extracted from the 525 lines of the next frame to be an odd field signal 4 and an even field signal 5, respectively. A 30 Hz interlaced signal 6 is generated. Therefore, it is possible to reproduce a moving image captured by double speed non-interlaced scanning using the conventional image transmission device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. The present invention is not limited to this.

FIG. 3 is a block diagram showing an example of the configuration of a video signal transmitting / receiving apparatus applied to the scan conversion system of the present invention. In this figure, 10 is a double speed non-interlaced camera, 11 is a transmitter, 12 is a receiver, and 13 is NT.
It is an SC type television monitor.

The transmission device 11 encodes a signal by performing an A / D conversion unit 14 for converting an analog signal into a digital signal, a scanning conversion unit 15 for converting a double speed non-interlaced signal into an interlaced signal, a compression such as a tumble drop. And a transmission line interface unit 17 for transmitting a signal to the transmission line.

The receiving device 12 includes a transmission line interface unit 18 for receiving a signal from a transmission line, a decoding unit 19 for decoding an encoded signal, and a D / A conversion for converting a digital signal into an analog signal. It is composed of a section 20.

The double-speed non-interlaced camera 10 is a camera capable of performing double-speed non-interlaced scanning of 525 lines with a frame cycle of 60 Hz, and a maker name "Takenaka System" or the like is currently available. Using this double-speed non-interlaced camera 10, an image of one frame obtained by photographing a subject is non-interlaced scanned with 525 lines, and the image is output as a double-speed non-interlaced signal having a frame period of 60 Hz.

The double speed non-interlaced signal is converted into a digital signal by the A / D converter 14 of the transmitter 11 and scan-converted into an interlaced signal by the scan converter 15.

FIG. 1 is an explanatory diagram showing the contents of scan conversion performed by the scan conversion unit 15. As shown in the figure, the scan conversion unit 15 converts the digital signal into the double speed non-interlaced signal 1 to the signal 2 of the odd line of 262.5 lines and the signal 3 of the even line of 262.5 lines. Take out the odd fields (ODD)
Signal 4 and even field (EVEN) signal 5,
A signal for one frame is generated from the signal 4 of the odd field and the signal 5 of the even field, and the frame period is 30H.
It is output as a z interlace signal (NTSC signal) 6.

In this case, in the case of performing 1/2 frame removal, when the odd line signal 2 and the even line signal 3 are taken out from the double speed non-interlaced signal 1, every other frame of the double speed non-interlaced signal 1. , The signal 2 of the odd line and the signal 3 of the even line are extracted from the same frame, and are set as the signal 4 of the odd field and the signal 5 of the even field, respectively. In order to perform more frame dropping, every n (arbitrary positive integer) frames of the double speed non-interlaced signal 1, the odd line signal 2 and the even line signal 3 are extracted from the same frame, and each odd number is taken. Field signal 4 and even field signal 5
And

When a still image is reproduced, the signal 1a for one frame of the double speed non-interlaced signal 1 is taken out when the signal 2 of the odd line and the signal 3 of the even line are extracted from the double speed non-interlaced signal 1. It is stored in a memory (not shown) as a still image, and the signal 2a of the odd line and the signal 3 of the even line are continuously extracted from the signal 1a for one frame, and the signal 4 of the odd field is extracted.
And even field signal 5.

As described above, if the signal 2 of the odd line and the signal 3 of the even line are taken out from the same frame, the signal 4 of the odd field and the signal 5 of the even field are obtained.
Since the time axes of and are the same, the screen vibration phenomenon does not occur.

FIG. 2 is an explanatory diagram showing the contents of the scan conversion in the case where the frame dropping and the still image reproduction are not performed. As shown in this figure, when the frame dropping or the still image reproduction is not performed, that is, when the image is reproduced as a moving image, when the odd line signal 2 and the even line signal 3 are extracted from the double speed non-interlaced signal 1. In addition, the odd line signal 2 and the even line signal 3 are alternately taken out for each frame of the double speed non-interlaced signal 1, and the odd field (ODD) signal 4 and the even field (EVEN) are respectively extracted.
Signal 5 of.

That is, from the 525th line of the first frame, the even line signal (262.5 line) is discarded, and only the odd line signal (262.5 line) 2 is extracted, and from the 525th line of the next frame. On the contrary, the odd line signal (262.5 line) 2 is discarded and only the even line signal (262.5 line) 3 is taken out. Then, the signals 2 and 3 are used as an odd field signal 4 and an even field signal 5, respectively, and an interlace signal (NTSC signal) 6 having a frame period of 30 Hz is generated.
To generate.

The scan conversion unit 15 is configured to perform such scan conversion (double speed non-interlace / interlace conversion) by controlling an address using a memory, for example.

The interlaced signal scan-converted by the scan converter 15 is compressed by the encoder 16 such as a frame dropper, and the transmission line interface 17 is used.
Is output from.

The output interlaced signal is received by the transmission path interface section 18 of the receiver 12,
Further, the data is decoded by the decoding unit 19, digital-to-analog converted by the D / A conversion unit 20, and output to the NTSC television monitor 13 for reproduction.

In this way, the frame period is 60 Hz.
An image obtained by double-speed non-interlaced scanning is obtained by extracting an odd-line signal 2 and an even-line signal 3 from the double-speed non-interlaced signal 1 and generating an interlaced signal 6 having a frame period of 30 Hz. It can be reproduced using a transmission device.

Further, even when the image frame is dropped or the still image is reproduced, since the odd line signal 2 and the even line signal 3 are taken out from the same frame on the same time axis, the vertical resolution is lowered. Without, it is possible to improve the vibration phenomenon of the screen.

Further, it is possible to reproduce a moving image taken by double speed non-interlaced scanning by using the conventional image transmission device.

[0031]

According to the present invention, since the interlaced signal is generated from the double speed non-interlaced signal and the image information is transmitted, the vibration of the screen in the frame dropping and the still image reproduction is performed without lowering the vertical resolution. The phenomenon can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the contents of scan conversion.

FIG. 2 is an explanatory diagram showing the contents of scan conversion.

FIG. 3 is a block diagram showing an example of a configuration of a video signal transmitting / receiving apparatus applied to the present invention.

[Explanation of symbols]

 1 double speed non-interlaced signal 2 odd line signal 3 even line signal 4 odd field signal 5 even field signal 6 interlaced signal 10 double speed non-interlaced camera 11 transmitter 12 receiver 13 NTSC system television monitor 14 A / D conversion Part 15 Scan conversion part 16 Encoding part 17, 18 Transmission line interface part 19 Decoding part 20 D / A conversion part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazumasa Miyano 3-22-8, Hakataekimae, Hakata-ku, Fukuoka City, Fukuoka City, Fukuoka Prefecture Fujitsu Kyushu Digital Technology Co., Ltd. (72) Kenzo Akita, Nakahara, Kawasaki, Kanagawa Prefecture 1015 Kamiodanaka, Ku within Fujitsu Limited (72) Hirotaka Nishida, 1015 Kamiodanaka, Nakahara, Kawasaki City, Kanagawa Prefecture, within Fujitsu Limited

Claims (3)

[Claims] 1. Using a camera capable of double-speed non-interlaced scanning with a frame cycle of 60 Hz, an image of one frame obtained by photographing an object is non-interlaced scanned with 525 lines, and the image has a frame cycle of 60
It outputs as a double speed non-interlaced signal (1) of Hz, takes out an odd line signal (2) and an even line signal (3) from the output double speed non-interlaced signal (1), and outputs them as an odd field signal (4). ) And an even field signal (5), a signal for one frame is generated from the odd field signal (4) and the even field signal (5) and output as an interlaced signal (6) with a frame period of 30 Hz, A scanning conversion system comprising reproducing the interlaced signal (6) by an NTSC system image reproducing device. 2. When the odd line signal (2) and the even line signal (3) are extracted from the double speed non-interlaced signal (1), the same frame is generated every one or a plurality of frames of the double speed non-interlaced signal (1). 2. The scan conversion method according to claim 1, wherein an odd line signal (2) and an even line signal (3) are extracted from the output signal to be an odd field signal (4) and an even field signal (5). 3. When an odd line signal (2) and an even line signal (3) are extracted from the double speed non-interlaced signal (1), an odd line signal () is generated for each frame of the double speed non-interlaced signal (1). 2. The scan conversion system according to claim 1, wherein the signal 2) and the even-numbered line signal (3) are alternately taken out as an odd-field signal (4) and an even-field signal (5).