JPH05316471A - Still picture display device - Google Patents

Abstract

PURPOSE:To obtain a frame still picture without the deterioration of a picture quality, which is completely still even to a moving picture by displaying the still picture by storing picture information obtained by scanning-line-converting a high grade TV signal by the portion of one field and repeatedly reading the stored piece of picture information. CONSTITUTION:In the case of displaying in a still picture, a still picture processing part 6 prohibits the writing of new data into a field memory 4 in the period of still display, repeatedly reads old data and set a still picture time signal b' to be the repeating of a field constituted by a line shown by the numeric characters of 1, 2, 3,.... Thus, one frame of a 525, 1:1 interlace signal and a 525, 2:1 interlace signal which are displayed by a double speed scanning monitor 12 and an NTSC monitor 10 are constituted by the numeric characters of 1, 2, 3,... existing within one field before (b') like respectively showing at (b') and (c'). Thus, the frame still picture without the deterioration of the picture which is completely still even to the moving picture is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image display device suitable for a system for processing high definition television (HDTV) signals.

[0002]

2. Description of the Related Art Conventionally, a method for obtaining 1 frame signal for displaying a still image after scanning line conversion of an HDTV signal of 1125, 2: 1 interface into an NTSC signal of 525, 2: 1. With (i) frame memory etc.,
There is a method of holding a video signal for one frame, and (ii) a method of generating a signal for one frame by signal processing from a video signal for one field.

[0003]

In the case of the conventional method (i), since the signal content of each field changes with time during a moving image, the obtained image becomes an image with jitter. Further, in the case of the conventional method (ii), since the vertical filter processing is performed, the vertical resolution may be deteriorated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a still image display device that can obtain a frame still image that is completely stationary even with respect to a moving image signal and has no image quality deterioration. To aim.

[0005]

A still image display apparatus according to claim 1 is a storage means (for example, the field memory 4 of the embodiment) and image information obtained by scanning line conversion of a high-definition television signal. Processing unit for storing 1 field for 1 field in the storage unit (for example, the scanning line conversion unit 2 of the embodiment)
And a second processing unit (for example, the still image processing unit 6 of the embodiment) that repeatedly reads the image information stored in the storage unit during the still image display period.

A still image display device according to a second aspect of the present invention includes a decoding means for decoding a transmission signal (for example, a MUSE signal or an HD-MAC signal) of a high definition television signal to obtain a high definition television signal, A storage means (for example, the field memory 4 of the embodiment) and a first processing means for storing one field of image information obtained by scanning line conversion of the high-definition television signal obtained by the decoding means in the storage means ( For example, the scanning line conversion unit 2) of the embodiment and the second processing unit (for example, the still image processing unit 6 of the embodiment) that repeatedly reads the image information stored in the storage unit during the still image display period are provided. It is characterized by

According to a still image display device of a third aspect of the present invention, the storage means (for example, the field memory 4 of the embodiment) and the image information obtained by scanning line conversion of a high-definition television signal for one field, A first processing unit (for example, the scanning line conversion unit 2 of the embodiment) to be stored in the storage unit, and a second unit for repeatedly reading the image information stored in the storage unit during a still image display period to obtain a non-interlaced signal. A processing unit (for example, the still image processing unit 6 of the embodiment) and a conversion unit for converting the non-interlaced signal obtained by the second processing unit into an interlaced signal (for example, the non-interlaced conversion unit 8 of the embodiment). ) And are provided.

[0008]

In the still image display device having the structure of claim 1,
Image information obtained by scanning line conversion of a high-definition television signal is stored for one field, and the stored image information is repeatedly read and displayed as a still image. Therefore, it is possible to obtain a frame still image that is completely stationary with respect to a moving image signal and has no image quality deterioration.

In the still image display device of the second aspect, the high-definition television signal is decoded to obtain a high-definition television signal, and the high-definition television signal is obtained by scanning line conversion. The image information to be stored is stored for one field, and the stored image information is repeatedly read and displayed as a still image. So, for example,
It is possible to obtain a frame still image that is completely stationary even with respect to a moving image signal included in a MUSE signal or an HD-MAC signal, and has no image quality deterioration.

In the still image display device of the third aspect, the image information obtained by scanning line conversion of the high definition television signal is stored for one field, and the stored image information is repeatedly read. Then, a non-interlaced signal is obtained, the non-interlaced signal is converted into an interlaced signal, and a still image is displayed. Therefore, it is possible to obtain a frame still image that is completely still with respect to a moving image signal and has no image quality deterioration, and to display the still image on an interlaced monitor such as an NTSC monitor.

[0011]

1 shows an embodiment of a still image display device when the present invention is applied to a MUSE-NTSC converter, and FIG. 2 shows an HDTV signal (MUSE) which is an input signal of the embodiment shown in FIG. The structure of the signal is shown in relation to the write enable signal, and FIG. 3 shows the scanning line structure of the signal of each part of the embodiment of FIG.

The scanning line conversion unit 2 is an HDT of 1125, 2: 1 interlace scanning supplied from the MUSE decoder.
The V signal (a) (see FIG. 3 (a)) is controlled by controlling the writing of data to the field memory 4
5,1: 1 non-interlaced signal (b) (Fig. 3 (b))
Convert to. That is, the scanning line conversion unit 2 is an HDTV of 1125, 2: 1 interlace scanning shown in FIG.
For each of the first field (I) and the second field (II) of the signal (a), a write enable signal (indicated by WE in FIG. 2) is written in the field memory 4 so as to extract 525 scanning lines. HD) to the field memory 4 by applying
By limiting the writing of the TV signal (a), a 525,1: 1 non-interlace signal (b) is obtained in the field memory 4.

The scanning line conversion section 2 reads the 525, 1: 1 non-interlace signal (b) stored in the field memory 4 as it is, and supplies it to the interlace conversion section 8 and the double speed scanning monitor 12. The interlace conversion unit 8 receives the 525, 1: 1 signals supplied from the scanning line conversion unit 2.
The non-interlace signal (b) is thinned out line by line so as to form a zigzag pattern for each field, and 525, 2: 1.
The interlace signal (c) is displayed, and this signal is displayed on the NTSC monitor 10. The double-speed scanning monitor 12 includes a scanning line conversion unit 2 through the 525, 1: 1 non-interlace signal (b).
Then, the signal is displayed.

In the case of displaying a still image, the still image processing section 6 stores new data in the field memory 4 during the still display period.
Data writing is prohibited, old data is repeatedly read,
A still image signal (b ') is obtained. As shown in FIG. 3 (b '), the still image signal (b') is changed to 1, 2, 3, ...
... When a field composed of lines indicated by numbers is repeated, the double-speed scanning monitor 12 is displayed when a still image is displayed.
And 525 displayed by the NTSC monitor 10.
The signals for one frame of the 1: 1 non-interlace signal and the 525,2: 1 interlace signal are shown in FIG.
As shown in (b ') and (c'), 1, 2, which exists in the previous one field (field I) of FIG. 3 (b ').
3, ...

In the above embodiment, 1125, 2: 1.
Since the display signal for one frame used for still image display is obtained from the image information originally existing in one field of the HDTV signal, the still image display can be performed even for the moving image signal. At the same time, no filter processing is applied to the signal at the time of normal display, so that a frame still image without image quality deterioration can be obtained.

In the above embodiment, the transmission signal of the high definition television signal is the MUSE signal, but the present invention is not limited to this. For example, the transmission signal of the high definition television signal is HD- It can also be applied to the case of a MAC signal. However, the MUSE signal already has 1125 lines / frame which is more than double the density of 525 scanning lines of NTSC / frame in the transmission mode, while HD-
With MAC, 625 lines / frame equivalent to PAL are used during transmission.
1250, which is double that of the decoding process after reception.
Book / frame. Therefore, the present invention provides HD-MAC
It can also be applied to the process of system conversion from a high-quality signal obtained by decoding a signal to a PAL signal.

[0017]

According to the still image display device of the first aspect, image information obtained by scanning line conversion of a high-definition television signal is stored for one field, and the stored image information is repeatedly read. Since the still image is displayed, the still image can be completely stopped even with respect to the moving image signal, and a frame still image without image quality deterioration can be obtained.

According to the still image display device of the second aspect, an image obtained by decoding the transmission signal of the high-definition television signal to obtain a high-definition television signal and scanning-line converting the high-definition television signal. Information is stored for one field, and the stored image information is repeatedly read out to display a still image. Therefore, for example, even for a moving image signal included in a MUSE signal or an HD-MAC signal, etc. A frame still image that is still and has no image quality deterioration can be obtained.

According to the still image display device of the third aspect, the image information obtained by scanning line conversion of the high definition television signal is stored for one field, and the stored image information is stored.
A non-interlaced signal is repeatedly read to convert the non-interlaced signal into an interlaced signal to display a still image, so that a frame that is completely still with respect to a moving image signal and has no image quality deterioration A still image can be obtained, and the still image can be displayed on an interlaced monitor such as an NTSC monitor.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a still image display device when the present invention is applied to a MUSE-NTSC converter.

FIG. 2 is an explanatory diagram showing a structure of an HDTV signal (MUSE) signal, which is an input signal of the embodiment of FIG. 1, in association with a write enable signal.

FIG. 3 is an explanatory diagram showing a signal scanning line structure of each unit of the embodiment of FIG. 1;

[Explanation of symbols]

 2 Scan line converter 4 Field memory 6 Still image processor 8 Interlace converter 10 NTSC monitor 12 Double speed scan monitor

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 7/01 Z 9070-5C

Claims (3)

[Claims] 1. Storage means, first processing means for storing, in the storage means, image information obtained by scanning line conversion of a high-definition television signal for one field, and image information stored in the storage means. And a second processing means for repeatedly reading during the still image display period. 2. Decoding means for decoding a transmission signal of a high-definition television signal to obtain a high-definition television signal, storage means, and scanning line conversion of the high-definition television signal obtained by the decoding means. A first processing means for storing the obtained image information for one field in the storage means; and a second processing means for repeatedly reading out the image information stored in the storage means during a still image display period. Characteristic still image display device. 3. A storage means and a first storage means for storing one field of image information obtained by scanning line conversion of a high-definition television signal in the storage means.
Processing means; second processing means for repeatedly reading the image information stored in the storage means during a still image display period to obtain a non-interlaced signal; and a non-interlaced signal obtained by the second processing means. A still image display device, comprising: a conversion means for converting into an interlaced signal.