JPH03108977A - Muse decoder - Google Patents

Abstract

PURPOSE:To enable non-interlace display by interpolating data by interpolation in a frame and multiply and adaptively mixing the data, to which an interpolation processing is respectively executed, corresponding to motion detection concerning a part judged as motion by the motion detection. CONSTITUTION:An in-frame interpolating means 9 is provided to interpolate the data by using the preceding and following lines of the current frame for each line in the frame of the transmitting data, and sampling frequency conversion is executed from this data train, to which the data interpolation is executed, to the data train at 489MHz rate. In the case of the motion detection, a one- frame motion detecting means 11 is provided to execute the motion detection only in one frame. At the time of non-interlace, when a still area executing interpolation between frames/between fields and a moving area executing the interpolation in the field are adaptively mixed for the transmitting data, corresponding to the one-frame motion detection, the data interpolated in the frame are multiply and adaptively mixed into those still area and moving area. Thus, the non-interlace display can be executed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applicable to MUSE (mul
tipla 5ubnyquist sample-in
The present invention relates to a MUSE decoder that can be applied to a non-repetitive system.

[Background of the invention and its problems] In recent years, TV receivers with larger screens (aspect ratio of 9) have been developed.
: 16) Various high-definition television receivers (HDTVs) are being developed. Compared to current television receivers, HDTVs are superior not only in the sense of realism and power of images, but also in the texture of a single image, and it is only a matter of time before they are put into practical use.

By the way, in HDTVs such as MUSE receivers, the transmitted MUSE signal is a band compression signal, so in order to reproduce images from the MuSE signal, current TV receivers do not have a υSE decoder (including memory).
hardware circuitry is required.

This MUSE decoder has the configuration shown in FIG. 3, for example, and converts the MUSE baseband signal to the A/D converter
32. Digital conversion is performed at a predetermined sampling frequency at .Convert the sampling frequency from 4M& to a data stream with a 48.6MHz rate, and similarly interpolate the motion area separated from the above transmission data within the field, and convert the sampling frequency from 32.4M& to a data stream with a 48.6MHz rate. Furthermore, the still area subjected to the sampling frequency conversion is used as a data string interpolated by the interfield interpolation means 6, and the interpolated still area data string and the moving area data string are combined into one frame motion and two motion area data strings. The mixing unit 8 performs adaptive mixing according to the motion detected by the frame motion detection means 7.

On the encoder side of the MUSE method, "motion detection" is performed to separate and process the still area and the moving area, and the processed signals are adaptively mixed and transmitted. Therefore, the decoder side is required to detect motion without any error compared to the encoder side.In other words, since the sample values are offset (multiplexed), motion detection cannot be easily performed.
The difference between the data of the frame (current frame) and the data of two frames before is taken, and since accurate motion detection is not possible with special images, motion detection is performed using one frame of four frames. The static area and the moving area are adaptively mixed.

On the other hand, in the NTSC system, due to technological advances, IDT
V, etc. have been developed, and in the case of this IDTV, etc.
To put it simply, it scans the scanning lines on both sides of the television at double speed to eliminate flicker. It is expected that this will also apply to the MUSE method.In other words, since flickering is likely to occur with the interlaced method, in the future MUSE
It is assumed that the decoder will be non-interlaced.

The present invention has been made in view of the above points, and its purpose is to provide a NUSE decoder that can perform non-interlacing of the MUSE decoder.

[Means for Solving the Problems] In order to achieve the above object, the present invention separates a static region and a moving region of transmission data using the Musti method, interpolates the static region between frames, and interpolates the static region between fields. Interpolate the above motion area within the field,
In a MUSE decoder that adaptively mixes the interpolated still area and motion area according to motion detection, within the frame that interpolates data using the lines before and after the current frame for each line within the frame based on the transmission data. The interpolation means and the interpolated data string are 48.6 MI (z
sampling frequency conversion means for converting the sampling frequency into a data string at a rate; one-frame motion detection means for performing motion detection using only one frame during the motion detection; The gist of the present invention is to include a mixing means for multiple adaptively mixing the interpolated data with the interpolated data in response to motion detection.

[Operation] With the above configuration, data is interpolated within a frame by the above-mentioned intra-frame interpolation, so it is possible to obtain higher-definition image data than when data is interpolated using @field. . Therefore, during non-interlacing, the interpolated data is subjected to multiple adaptive mixing, but this multiple adaptive mixing is performed as described above for the portions determined to be motion by 1-frame motion and 2-frame motion detection.
This is performed by motion detection using frame motion detection means.

Then, as described above, data for a high-definition image is obtained, that is, the scanning lines are interpolated, and image data that can be displayed in a non-interlaced manner is output.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. In FIG. 1, the same parts as in FIG. 3 are designated by the same reference numerals, and redundant explanation will be omitted.

In FIG. 1, the MUSE decoder includes an intra-frame interpolation means 9 for interpolating transmission data obtained by the A/D converter 1 within a frame, and a data string 32. Sampling frequency conversion means 10 converts the sampling frequency from 4 MHz to a data stream with a rate of 48.6 MHz, and 1 frame motion detection means 11 performs motion detection using only 1 frame when performing motion detection in the 1 frame motion and 2 frame motion detection means 7. Then, the data string subjected to the sampling frequency conversion, the still area obtained by the sampling frequency converting means 4, and the moving area data string obtained by the sampling frequency converting means 5 are detected by one frame motion and two frame motion detecting means. 7 and a mixing section 12 that performs multiple adaptive mixing according to the motion detected by the one-frame motion detecting means 9.

Here, when the above-mentioned ARI SE decoder is non-interlaced, the transmission data is interpolated line by line within a frame using the lines before and after the current frame. That is,
For example, within the frame shown in Figure 2, data is interpolated using white circles and white angles of view, so it is possible to obtain a higher-definition image data string than by interpolating image data using only the white circles, for example. can. Then, the data string interpolated by the intra-frame interpolation is frequency-converted by the sampling frequency conversion means 10 into a data string of 48.6M&rate.

On the other hand, in the 1-frame motion detection 11, motion detection is performed using only 1 frame of the portion whose motion has been detected by the 1-frame motion and 2-frame motion detection means 7, and this motion detection, 1-frame motion, and 2-frame motion detection Due to the motion detection by the means 7, the intra-frame interpolated data string, the inter-frame/inter-field interpolated data string, and the inter-field interpolated data string are multi-adapted in the mixing unit 12. mixed. In other words, even if it has been determined to be motion, there is a high possibility that it is stationary within the frame, so the intra-frame interpolation means 9 obtains high-definition image data, that is, a form obtained by interpolating scanning lines. Therefore, image data that enables non-interlaced display can be obtained from the MUSH baseband signal.

[Effects of the Invention] As described above, according to the present invention, the baseband signal of MUSH is converted into digital data, and in this converted digital data (transmission data), the lines before and after the current frame are converted line by line within the frame. Intra-frame interpolation is used to interpolate the data, and the interpolated data string is
There is a sampling frequency conversion that converts the sampling frequency into a data stream at an 8.6MHz rate, and a 1-frame motion detection that performs motion detection using only one frame. When non-interlaced, the transmission data is converted between frames/fields. When adaptively mixing the interpolated still region and the intra-field interpolated motion region, the intra-frame interpolated data is multi-adaptive mixed into the still region and the motion region according to the one-frame motion detection. Therefore, when non-interlacing, the reproduced image data from the transmitted data is made into higher-definition image data,
Scanning line interpolation can be performed and non-interlace display can be made possible.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a MUSE decoder showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the MUSE decoder, and FIG. 3 is a schematic block diagram of the MUSE decoder. . In the figure, 1 is an A/D converter, and 2 is an interframe interpolator. 3 is intra-field interpolation, 4, 5.10 is sampling frequency conversion, 6 is inter-field interpolation, 7 is 1-frame motion and 2-frame motion detection, 9 is intra-frame interpolation, 1
1 is a one-frame motion detection unit, and 12 is a mixing unit.

Claims (1)

[Claims] (1) Separate the still area and the moving area of transmission data using the MUSE method, interpolate the still area between frames, interpolate between fields, interpolate the moving area within the field, and perform interpolation processing. In a MUSE decoder that adaptively mixes a still area and a moving area according to motion detection, an intra-frame interpolation means for interpolating data using lines before and after the current frame for each line within the frame of the transmitted data; sampling frequency converting means for converting the sampling frequency of the interpolated data string into a data string at a rate of 48.6 MHz; one-frame motion detecting means for detecting the motion using only one frame during the motion detection; A MUSE characterized by comprising: mixing means for multiple adaptively mixing the intra-frame interpolated data with the interpolated data according to the one-frame motion detection for a portion determined to be detected.
decoder.