JPS63245083A - Still picture reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a still picture free from blur of a motion part even in case of still picture reproducing based on picture data of a moving picture by performing such control on the basis of the detection output of a motion detecting circuit that picture data outputted from a second picture memory is selected in a motion area. CONSTITUTION:With respect to the motion detection part in one field period just after the start of still picture reproducing and the motion detection part in each field, picture data stored in a field memory 5 is read out to perform intra-field interpolation and read picture data is stored in the memory 5 again. Consequently, picture data of the motion part of the first field can be outputted as picture data in the same part of another field. Thus, the still picture free from blur of the motion part is reproduced even if the original picture is a moving picture.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of the Invention The present invention relates to a still image reproducing device, and more particularly to a still image reproducing device that reproduces still images from image data using a subsampling transmission method that makes one cycle in n fields.

M jj S E (Multiple 5ub
-NY, QLliStSampling Encodi
ng) method has been proposed (Reference Ninomiya, “New transmission method for high-definition television ~MLISE~”, N) (K Giken Monthly Report Vol. 1.27. No. 7).

In the MtJSE method, as shown in Figure 4, consecutive 4
Change the position of the field screen for each field to 1/4
By thinning out pixels and transmitting them, the band is compressed to 1/4. In the figure, X indicates a pixel that is not transmitted, and the untransmitted pixel is reproduced on the receiving side by temporal and spatial interpolation with motion correction and motion detection.

In other words, in the MUSE method, in moving areas, the overlapping of four fields results in an unnatural image, so in moving areas, only one field's worth of image data sent at that time is used to restore the image. conduct. For this reason, on the receiving side, it is necessary to determine whether each position within the screen is a moving area or not (motion detection).

FIG. 3 shows a conventional example of a MUSE decoder. In the figure, image data based on the sub-Nyquist sampling transmission method that goes around in four fields is supplied to a frame memory 1 as a first image memory via a switch S+. The frame memory 1 is composed of two field memories. Switch S1 is 1 during normal playback.
It is inverted at the sub-sampling timing of 6.2MH2, and is fixed at bIl during still image reproduction, and is controlled by a system controller (not shown). By reversing the sub-sampling timing of switch s1, two frames (four fields) of image data at a sample rate of 16.2 MHz are stored in frame memory 1.
It will be stored in

The image data input to the frame memory 1 is supplied to the mixer 2, and the image data Jq! The signal is supplied to the circuit 3 and the motion detection circuit 4. The image data output from the frame memory 1 is supplied to the motion detection circuit 4 and is again input to the frame memory 1 via the switch S+. The motion detection circuit 4 detects the motion of an image based on the absolute value of the difference between the current image data that is input to the frame memory 1 and each image data one frame before and two frames ago that have passed through the frame memory 1. . The motion information detected by the motion detection circuit 4 is supplied to the mixer 12 and switch $3. In addition,
mixture! The switch S2 is supplied with about 4 pits of motion information including motion amount information, and the switch S3 is supplied with 1 pit of motion information indicating only the presence or absence of a motion area. In the mixing 112, the image data that is input to the frame memory 1 and the moving area interpolation circuit 3 are combined.
The interpolated image data is mixed according to the motion information.

The image data output from the mixer 2 is sent to a field memory 5 as a second image memory and an interfield interpolation circuit 6.
and the field interpolation circuit 7, respectively. The image data of one field before passing through the field memory 5 is supplied to an interfield interpolation circuit 6. Each output data of the inter-field interpolation circuit 6 and the intra-field interpolation circuit 7 is inputted to the switch S3, and when there is no motion area based on the motion information supplied from the motion detection circuit 4, the output data of the inter-field interpolation circuit 6 is outputted to the switch S3. When the output data includes a motion area, the output data of the intra-field interpolation circuit 7 is alternatively output.

In this configuration, when performing still image playback, the switch S+ is fixed to the b side to prohibit writing to the frame memory 1, and the image data for four fields stored in the frame memory 1 are sequentially read out. Still image playback can be achieved. When applying this still image playback to still image files, etc., since there is no moving area in the image,
With the conventional circuit configuration described above, still images can be reproduced without any problem. However, when the original image is a moving image and a still image is to be played back based on image data for four fields of this moving image, motion mode playback is performed based on the detection output of the motion detection circuit 4 for moving parts. Even so, scratches will occur in the moving parts. In addition, in still image playback, frame memory 1
Since only 4 fields of image data are stored in , and the motion detection circuit 4 cannot take the difference between two frames, the motion information at this time is information based only on the difference between one frame.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a still image reproducing device that can reproduce still images without blurring in moving parts even when reproducing still images based on image data of a moving image. With the goal.

The still image reproducing device according to the present invention has a first image memory capable of storing image data equivalent to n fields, and a still image reproducing device based on the difference between image data before and after one frame stored in this first image memory. A motion detection circuit detects motion of an image, a second image memory capable of storing image data equivalent to one field, and a motion detection circuit detecting motion of image data supplied from the first image memory. It includes a static interpolation circuit that performs intra-field interpolation in the motion area and interpolation between fields in the other static areas, and performs static interpolation from image data using a subsampling transmission method that makes one cycle in n fields (for example, 4 fields). In the device configured to reproduce an image, selecting means supplies either one of the image data supplied from the first image memory and the image data output from the second image memory to the second image memory. It is characterized in that the image data outputted from the second image memory is not selected in the motion area based on the detection output of the motion detection circuit.

1-blind-1 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an ML to which the still image reproducing device according to the present invention is applied.
3 is a block diagram showing an embodiment of a JSE decoder, in which parts equivalent to those in FIG. 3 are designated by the same reference numerals. FIG. In the figure, a switch S4 is provided at the front stage of the field memory 5 as a selection means for outputting the output data of the mixture 12 by one person and inputting the output data of the field memory 5 by another person. During still image playback, the υ1111 circuit 8 switches to the a side in the still area and to the b side in the moving area. The tSa circuit 8 includes a switch S5 that outputs one bit of motion information indicating the presence or absence of a motion area, which is the detection output of the motion detection circuit 4, a field memory 80 that stores the motion information that has passed through this switch Ss, and a field memory 80 that stores the motion information that has passed through this switch Ss. memory 8
0 and the detection output of the motion detection circuit 4.
The addition output of the R circuit 81 switches the switches Ss and Ss to v4tIIl. The switch Ss in the control circuit 8 is activated only during one field period immediately after a still image reproduction command is issued by the system controller (not shown).
As a result, the detection output of the motion detection circuit 4 during one field period immediately after the start of still image reproduction is stored in the field memory 80.

Next, the operation during still image playback in such a configuration will be described.

First, when the original image is a still image, such as a still image file, and the still image is reproduced based on image data for four fields of this still image, the motion detection circuit 4 detects a moving area. Because it will not be done.

Both switches Ss and S4 are always on the a side, and the mixing 1
The ring image data supplied from 12 is interpolated between fields by a field interpolation circuit 6 based on the image data of the previous field that has passed through the field memory 5, and is output as high-resolution m-image data.

Next, a case where the original image is a moving image and a still image is reproduced from image data for four fields of this moving image will be described. Now, assuming that there is a motion area in the four fields of image data stored in the frame memory 1, and that this motion area moves to the right for each field as shown in FIG. Since the detection circuit 4 performs motion detection based on one frame difference, when the image data of the first and third fields are read out from the frame memory 1, the first and third fields are detected as shown in FIG.
In each moving part of the field (solid line 0 mark), when the image data of the second and fourth fields are read out, the second
Motion detection is performed for each moving portion (solid line 0 mark) of the fourth field. Here, in response to the still image reproduction command, the motion information of the motion detection circuit 4 in, for example, the first field period immediately after that, that is, the motion information shown in FIG.
It is assumed that the movement information of the Q seal valve in the first field is stored in the field memory 80.

In this state, when the second field of image data is read out from the frame memory 1, both switches S3 and S4 are on the a side in the static area, and the read out second field image data is
The field image data is subjected to interfield interpolation in an interfield interpolation circuit 6 based on the image data of the previous field that has passed through the field memory 5. On the other hand, the field memory 80 stores in advance the motion information of the part indicated by O in the first field in FIG. 2(B), and the motion detection circuit 4
Motion detection is performed in the part of the field indicated by the O mark, and the switches S3 and S4 are both switched to the b side in response to these detection outputs, so that the image data of the first field is read out from the field memory 5 in each moving part. This image data is stored again in the field memory 5, and interpolated within the field by the intra-field interpolation circuit 7 to become output data. In addition, Fig. 2 (C)
is the image data stored in the field memory 5, and FIG. 2 (D) is the output data after interpolation (solid line and dotted line O marks indicate intra-field interpolation, and the rest are inter-field interpolation). are shown respectively.

When the third field of image data is read out from the frame memory 1, the interfield interpolation circuit 6 directly performs interfield interpolation in the static area, but the third field in FIG. Since motion detection is performed in the part indicated by the 0 mark, and the switch 83 and SJ are both switched to the b side, the image data of the first field is read out from the field memory 5 only in this part, and this image data is read out again. The data is stored in the field memory 5, and interpolated within the field by the intra-field interpolation circuit 7 to become output data.

Subsequently, when the image data of the fourth field is read out from the frame memory 1, the interfield interpolation circuit 6 directly performs interfield interpolation in the static area.
The field memory 80 stores in advance the motion information of the part indicated by the 0 mark in the first field in FIG. 2(B), and the motion information of the part indicated by the O mark in the fourth field in FIG. Motion detection is performed in the portion shown by , and both switches Sa and Ss are switched to the b side by the generation of both outputs. Therefore, in the fourth field of FIG. 2(C), the field is detected in the odd-numbered motion detection portion from the left The image data of the first field is read out from the memory 5, the image data of the third field previously stored in the field memory 5 is read out in the even-numbered motion detection part, and these image data are stored in the field memory 5 again. At the same time, the intra-field interpolation circuit 7 performs interpolation within the field to obtain output data.

When the first field of image data is read out from the frame memory 1, the same operation as in the case of the third field is performed. By repeating the above series of operations, still image playback is performed from image data for four fields of a moving image.As mentioned above, the motion detection portion and each Field memory 5 is used for motion detection in the field.
By reading out the image data stored in the memory 5 and performing intra-field interpolation, and storing the read image data in the memory 5 again, as is clear from FIG. 2(D), for example, the first field Since image data of a moving part can be output as image data of the same part in another field, even if the original image is a moving image, it is possible to reproduce a still image without blur in the moving part.

Note that since only one bit of motion information is required to be imported into the field memory 80, the newly added field memory 80
It may have a very simple configuration, and it is also possible to configure it as a 9-bit field memory integrally with the field memory (8-bit) 5, and in any case, it can be realized at low cost.

Furthermore, as a conventional example, the field memory 5 used for inter-field interpolation is separately provided from the frame memory 1, and its application thereto has been shown, but as another conventional example, as shown in FIG. , without the field memory, extracts the field-delayed output from the intermediate tap of the frame memory, combines this with the frame memory input, performs static region interpolation (interfield interpolation), and inputs the result to the mixer. A possible configuration is possible.

An example in which the present invention is applied in this case is shown in FIG. 6, and it is clear that the same effects as in the above embodiment can be obtained.

As explained above, in the still image playback device according to the present invention, the motion detection portion in one field period immediately after the start of still image playback and the motion detection portion in each field are based on images stored in the field memory. The structure is such that it reads data and performs intra-field interpolation, and also stores the read image data in the memory again, and outputs image data of a moving part of one field as image data of the same part of another field. Even if the original image is a video, it is possible to play back still images without blur in moving parts.

[Brief explanation of drawings]

FIG. 1 shows an MU to which the still image playback device according to the present invention is applied.
A block diagram showing one embodiment of the SE decoder, FIG.
) ~ (D> is an explanatory diagram of the operation during still image playback in Fig. 1, Fig. 3 is a block diagram showing a conventional example of a MUSE decoder, and Fig. 4 shows a sampling pattern (for luminance signals) of the MLISE method. 5 is a block diagram showing another conventional example of a MUSE decoder, and FIG. 6 is a block diagram showing another embodiment of the present invention. Explanation of symbols of main parts 1... Frame Memory 4...Motion detection circuit 5.80...Field memory 6...
...Interfield interpolation circuit 7 ...Intrafield interpolation circuit 8 ...Control circuit

Claims (2)

[Claims] (1) A first image memory capable of storing image data equivalent to n fields, and detecting image movement based on the difference between image data of one frame before and after one frame stored in the first image memory. a motion detection circuit; a second image memory capable of storing image data equivalent to one field; and a motion area detected by the motion detection circuit with respect to the image data supplied from the first image memory; A still image reproducing device that reproduces a still image from image data using a subsampling transmission method that makes one round in n fields, and includes a still interpolation circuit that performs interpolation between fields and interpolates between fields in other still areas. a first selection means for supplying either one of the image data supplied from the first image memory and the image data output from the second image memory to the second image memory; a second selection means for selecting image data to be output from the second image memory in the motion area based on a detection output of the motion detection circuit; and a control means for controlling the first and second selection means. A still image playback device comprising: (2) The control means has a storage means for storing the detection output of the motion detection circuit in one field period immediately after the still image reproduction command, and the detection output of the motion detection circuit and the storage means according to the memory output of the first
2. The still image reproducing apparatus according to claim 1, further comprising controlling the second selection means and the second selection means.