JP2001223992A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily grasp whole recording contents and to appropriately judge each of the contents. SOLUTION: When a high-speed search is started, the reduction screen of an input video signal is stored to the prescribed position of an image memory in a step 1. It is judge whether an optional condition is detected in the input video signal or not in a step 2. When the condition is detected (Yes), the storing position of the reduced screen of the input video signal to the image memory is updated to be a succeeding position in a step 3. Unless the optional condition is detected in the step 2 (No) and when a processing is completed in the step 3, it is judged whether the storing position of the reduced screen of the input video signal in the image memory remains or not in a step 4. When the position remains (Yes), a processing is returned to the step 1 and the processing of the high-speed search up to that time is repeated. Unless the position remains (No) in the step 4, the high-speed search is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device suitable for use in, for example, forming and displaying a so-called index image from an input video signal reproduced by a high-speed search. Specifically, for example, it is used for reducing an arbitrary screen in a video signal reproduced by a high-speed search and displaying the reduced screens side by side.

[0002]

2. Description of the Related Art For example, it may be required to check the contents of a recording medium recorded for a long time. In such a case, so-called high-speed search reproduction has been generally performed, for example, on a tape-shaped recording medium. However, such high-speed search reproduction is convenient for the purpose of, for example, searching for a single point of a desired video signal because the display content is changed one after another. However, for example, the entire content of the recorded recording medium is deleted. It is inappropriate for purposes such as grasping.

On the other hand, for the purpose of, for example, confirming the contents of a recording medium recorded for a long time, a screen such as the beginning of a so-called spliced portion at the time of photographing is taken out, and a reduced still image is formed. Are also arranged to create and display a so-called index image. However, in the conventional index image, for example, only one screen such as the beginning of a spliced portion is displayed, so that it may be difficult to determine the recorded content of that part only in the first screen. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the problem to be solved is that, in the conventional apparatus, for example, the conventional high-speed search reproduction is recorded. It is inappropriate for the purpose of grasping the entire contents, and it is difficult to judge the recorded contents in the conventional index image because only one screen such as the beginning is displayed. is there.

[0005]

For this reason, in the present invention, a screen displayed in an index image is searched, and at the same time, still images of a required screen are displayed side by side. According to this, it is possible to satisfactorily grasp the entire contents recorded on the recording medium and judge the individual recorded contents.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the present invention provides an image memory for one screen or a plurality of screens for temporarily storing an image, an input video signal which is reduced and pasted at a predetermined position in the image memory, and A memory controller for repeatedly reading the entire screen of one screen of the memory to form an output video signal;
The reduced input video signal is sequentially updated and pasted at a predetermined position in the image memory, and when an arbitrary condition is detected from the input video signal, the update of the pasting is stopped, and the input video signal is reduced and the image is reduced. It is attached to the next location in the memory.

By the way, for example, MPEG (= Moving
Picture coding Experts Gr
An apparatus for compressing and recording / reproducing a video signal using an (out) method has been proposed. In this case, for example, to decode and reproduce a video signal recorded in the MPEG system,
For example, a frame called an I frame which can be decoded independently provided every 15 frames is decoded, and a frame called a P and B frame formed by a difference between the frames is decoded using the I frame, and a video signal is decoded. All frames to be formed are reproduced.

In order to reproduce such a recording medium recorded by the MPEG system in a time series different from that at the time of recording, for example, in a high-speed search, for example, only the above-described independently decodable I frames are sequentially recorded. To form a video signal. That is, for example, when an I frame is provided for every 15 frames of a video signal as described above, a high-speed search reproduction of 15 times speed can be performed by reproducing only the I frame. In this case, the reproduced video signal is completed in one frame and additional information can be obtained.

The present invention has been made in view of these points. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a video signal reproducing apparatus to which an image display device of the present invention is applied. Although the embodiment of FIG. 1 shows a case where the video signal compressed by the above-described MPEG system is recorded on a tape-shaped recording medium, the present invention is applied to any compression system. In addition, the present invention can be applied to a video signal recorded without compression. Further, the recording medium is not limited to a tape, but can be applied to other types of recording media such as a disk.

In FIG. 1, for example, a tape 1 as a recording medium is wound around a rotating drum (not shown) provided with a magnetic head 2 and transferred by a drive system (not shown). The tape 1 has, for example, MPE
A video signal compressed by the G system is recorded, and the video signal recorded on the tape 1 is reproduced through the magnetic head 2. Further, the reproduced signal from the magnetic head 2 is
The data is supplied to the reproduction processing unit 3 to extract a bit stream of, for example, the MPEG system, and the bit stream is supplied to a decoder circuit 4 of, for example, the MPEG system.

As a result, the compression at the time of recording is restored by the decoder circuit 4, and the video signal is reproduced. In other words, the decoder circuit 4 decodes a frame called an I-frame which can be independently decoded and provided, for example, every 15 frames from a video signal compressed by, for example, the MPEG system. Using the decoded I frame, frames called P and B frames formed by the difference between the frames are decoded. Thus, all frames forming the video signal are restored, and the video signal is reproduced.

In this apparatus, when reproducing in a time series different from that at the time of recording such as a high-speed search, for example, only the above-described independently decodable I frames are sequentially decoded to form a video signal. You. Thus, for example, when an I frame is provided for every 15 frames of the video signal, only the I frame is reproduced, so that a high-speed search reproduction of 15 times speed is performed.
The video signal reproduced here is completed in one frame, and information added to the video signal is also obtained.

Then, the video signal restored by the decoder circuit 4 is supplied as an input video signal of the present invention to an image memory 5 composed of a frame memory or a field memory for one or a plurality of screens. Further, for example, arbitrary conditions of the input video signal detected by the decoder circuit 4;
For example, detection at the beginning of an input video signal, when an arbitrary index mark provided in added information, or when data of recording date and time in the added information is separated from additional information of the immediately preceding video signal by a predetermined time or more. The signal is supplied to a memory controller 6 that controls the image memory 5 described above.

Further, the horizontal signal from the decoder circuit 4 described above is output.
A synchronization signal such as vertical / field discrimination is supplied to the memory controller 6. Then, an address and a write / read control signal from the memory controller 6 are supplied to the image memory 5. As a result, for example, a video signal of an index image pasted at a predetermined position of the image memory 5 by reducing the input video signal is formed. Further, a video signal formed in the image memory 5 is taken out to an output terminal 7 as an output video signal. Further, a synchronization signal from the decoder circuit 4 is taken out to an output terminal 8.

In this apparatus, the memory controller 6 performs processing such as that shown in the flowchart of FIG. That is, in FIG. 2, when the high-speed search is started, first, a reduced screen of the input video signal reproduced from the decoder circuit 4 is pasted at a predetermined position in the image memory 5 in step [1]. Next, in step [2], it is determined whether or not an arbitrary condition, for example, an index mark is detected in the input video signal. When the index mark is detected (Yes), in step [3], the input video signal The paste position of the reduced screen is updated to the next position.

Further, if any condition such as an index mark is not detected in step [2] (No) and if the process in step [3] is completed, the input video data of the image memory 5 is read in step [4]. It is determined whether or not the pasting position of the signal reduced screen remains. When the pasting position remains in step [4] (Yes)
Is returned to step [1], and the high-speed search processing up to this point is repeated. If no pasting position remains in step [4] (No), the high-speed search process ends.

As a result, the output terminal 7 is connected to, for example, FIG.
An output video signal in which an index image is displayed as shown in FIG. That is, in FIG. 3, it is assumed that an index mark is provided at the beginning of the input video signal at the start of the search. So at the start of the search,
As shown in FIG. 3A, the index picture of the first input video signal at the start of the search is displayed at the first pasting position. Immediately after the start of the search, the index image is displayed as shown in FIG. 3B, and the input video signal is displayed as the search image at the next pasting position.

Immediately after the second index mark is detected, an index picture and an index picture of the input video signal in which the second index mark is detected are displayed as shown in FIG. 3C. Then, the input video signal is displayed as a search image at the next pasting position. Also, the index images of the respective input video signals are sequentially displayed each time the subsequent index mark is detected. For example, immediately after the eighth index mark is detected, as shown in FIG.
Then, the input video signal is displayed as a search image at the last pasting position.

When the ninth index mark is detected, the index images of the input video signal are sequentially displayed for each detection of the index mark as shown in FIG. Is terminated. In this way, the index images in which the input video signals of the respective index marks are reduced at the respective pasting positions are formed and displayed. Although the number of index images to be displayed is nine in the embodiment of FIG. 3, the number may be more or less.

The processing of pasting the index images obtained by reducing the input video signals in order can be performed, for example, as shown in the flowchart of FIG. In the memory controller 6 described above, for example, when an address at the upper left corner of the pasting position is set, a video signal arbitrarily thinned in the horizontal and vertical directions from the address is written and a reduced index image is written. Is formed. Then, as the initial value at the start of the search, for example, the address (X, Y) of the upper left corner of the first pasting position is set.

Therefore, the process of updating the pasting position in step [3] of the flowchart of FIG. 2 is performed as shown in FIG. 4, for example. That is, in FIG. 4, first, in step [31], the value of the set value X is incremented by a value corresponding to the distance from the next pasting position in the horizontal direction. As a result, the address at the upper left corner of the pasting position is moved by a predetermined distance in the horizontal direction (X direction), and the next pasting position is set. In this way, for example, as shown in FIG. 3, the pasting position of the reduced screen of the input video signal is updated to the next position.

In step [32], it is determined whether or not the incremented value of X exceeds the limit of the horizontal display range. When the value of X exceeds the limit (Yes), the value of the set value X is reset to the initial value in step [33], and the value of Y in the vertical direction is reset in step [34]. The value is incremented by a value corresponding to the distance from the pasting position of the next row. If the value of X does not exceed the limit in step [32] (No)
Is set as it is. Thereby, the pasting position is updated to the first position of the next stage in the vertical direction (Y direction).

In this manner, the index images obtained by reducing the input video signal are pasted in order. In this case, in the formed index image, the video signal reproduced by the high-speed search is displayed together with the search image, so that the entire contents of the recording medium can be well grasped by the displayed index image. And the recorded content corresponding to these index images can be easily determined by the search image.
Very good index images can be formed.

Therefore, in this embodiment, while searching for the screen displayed in the index image, the still images of the required screens are displayed side by side at the same time, so that the entire contents recorded on the recording medium can be grasped. Thus, it is possible to make a good judgment on the content of each record.

As a result, in the conventional apparatus, for example, the conventional high-speed search reproduction is not suitable for the purpose of grasping the entire recorded contents, and the conventional index image has only one screen at the beginning or the like. However, according to the present invention, it is possible to easily solve these problems, although it is sometimes difficult to determine the recorded contents because of the display of the.

The arbitrary conditions for pasting the reduced screen of the input video signal to the image memory 5 include not only the above-described detection signal of the index mark and the like, but also, for example, a user operating a button during a search. The screen arbitrarily selected may be pasted to the image memory 5 as a reduced screen. If it is preferable to select a screen after a lapse of a predetermined time from the beginning of the video signal of each search, a screen after a set time from the index mark is captured by control of a microcomputer or the like forming the memory controller 6, for example. You may do so.

In the above embodiment, the high-speed search is terminated when, for example, nine index images are displayed. That is, in the above-described apparatus, the search for the ninth and subsequent index marks is not performed, and no index image is displayed. However, especially on a recording medium capable of recording for a long time, the number of index marks provided is not always nine or less. Therefore, in such a case, for example, the ninth and subsequent index images can be displayed as follows.

That is, in this case, for example, in the above-described apparatus, the image memory 5 is provided with a plurality of screens, and the memory controller 6 is provided with, for example, processing as shown in the flowchart of FIG. In FIG. 5, when the high speed search is started, first, step [1]
The input video signal reproduced from the decoder circuit 4 is reduced and pasted at a predetermined position in the image memory 5. Next, in step [2], it is determined whether an arbitrary condition, for example, an index mark has been detected in the input video signal.

If an arbitrary condition such as an index mark is detected in step [2] (Yes), the pasting position of the reduced screen of the input video signal to the image memory 5 is shifted to the next position in step [3]. Will be updated to When no index mark or the like is detected (No) and when the processing of step [3] is completed, it is determined in step [4] whether the pasting position of the reduced screen of the input video signal of the image memory 5 remains. If the pasting position remains (Yes), the process returns to step [1], and the high-speed search processing up to this point is repeated.

If no pasting position remains in step [4] (No), it is further determined in step [5] whether a pasting screen of the reduced screen of the input video signal in the image memory 5 remains. You. That is, when a plurality of screens are provided in the image memory 5, the pasted screens for the number of the screens are formed. If the pasting screen remains in step [5] (Yes),
In step [6], the paste screen is updated, and the process returns to step [1]. Further, if no pasting screen remains in step [5] (No), the high-speed search process is terminated.

In this way, index images for a plurality of screens provided in the image memory 5 can be formed for the ninth and subsequent index marks. Thus, even for a recording medium capable of recording for a long time, for example, the ninth and subsequent index marks can be searched, and index images several times as large as nine screens can be displayed. . The display of the second and subsequent index images can be performed by means (not shown) such as supplying a manual control signal to the memory controller 6, for example.

Therefore, in this embodiment, while searching for a screen to be displayed in the index image, the still images of the required screen are displayed side by side at the same time, so that the entire contents recorded on the recording medium can be grasped. In addition to being able to make a good judgment on the contents of individual recordings and increasing the number of still images to be displayed as compared with the case of one index image, it is also possible to make a good recording medium capable of recording for a long time, for example. Display can be performed.

In the above embodiment, for example, FIG.
, A search image is displayed adjacent to the index image. In that case, in the above-described processing, the index image is displayed at the beginning of the adjacent search image, and when there is little change in the video signal during the search, almost the same two images are displayed side by side. Displaying such an index image may give the user an unnecessary misunderstanding. In addition, since the search image related to the last index image is not displayed, it may be difficult to determine the recorded content of that portion.

To solve such a problem, for example, the memory controller 6 shown in FIG.
For example, it is conceivable to perform the processing shown in the flowchart of FIG. That is, in FIG. 6, when the high-speed search is started, first in step [11], the decoder circuit 4
It is determined whether or not an arbitrary condition, for example, an index mark has been detected in the input video signal reproduced from, and when the index mark has been detected (Yes), the image memory 5 is determined in step [12].
Is updated to the next position.

If no arbitrary condition is detected in step [11] (No) and if the processing in step [12] is completed, a reduced screen of the input video signal is stored in the image memory 5 in step [13]. It is pasted on a predetermined position. Further, in step [14], it is determined whether or not the pasting position of the reduced screen of the input video signal of the image memory 5 remains, and if it remains (Yes), the process proceeds to step [11].
And the high-speed search processing up to this point is repeated. If no pasting position remains in step [14] (No), the high-speed search process ends.

Thus, for example, an output video signal for displaying an index image as shown in FIG. 7 is taken out from the output terminal 7 shown in FIG. That is, in FIG. 7, the index mark at the beginning of the input video signal at the start of the search is ignored. Therefore, at the start of the search, a search image is displayed at the first pasting position as shown in FIG. 7A. After that, until the second index mark is detected including the beginning,
As shown in FIG. 7B, the search image of the input video signal is continuously displayed at the first pasting position.

Further, when the above-mentioned second index mark is detected, the last screen of the search image of the input video signal is left at the first pasting position as an index image. As shown, the input video signal is displayed as a search image at the next pasting position. Further, the index picture of the last screen of each search picture is displayed in order for each subsequent index mark detection. For example, immediately after the ninth index mark is detected, as shown in FIG. Index picture ~
Then, the input video signal is displayed as a search image at the last pasting position.

When the tenth index mark is detected, the index picture of the last screen of each search picture is displayed in order for each index mark detected, as shown in FIG. The search process ends. In this way, the index images obtained by reducing the last screen of the input video signal for each index mark are pasted at the respective pasting positions and formed and displayed. Although the number of index images to be displayed is nine in the embodiment of FIG. 7, this number may be more or less.

In this manner, index images obtained by reducing the input video signal are pasted in order. In this case, since the search image of the video signal reproduced by the high-speed search is directly displayed as the index image, the correspondence between the search image and the index image is clear, and the displayed index image is displayed. This makes it possible to satisfactorily grasp the entire contents of the recording medium, display the search image related to the last index image, and form an extremely good index image.

Therefore, in this embodiment, while searching for the screen displayed in the index image, the still images of the necessary screens are displayed side by side at the same time, so that the entire contents recorded on the recording medium can be grasped. In addition to being able to make a good judgment on the contents of each record, the correspondence between the search image and the index image can be made clear, and the search image related to the last index image can also be displayed. is there.

However, in the above embodiment, for example, FIG.
In the index picture displayed by, the last picture of the video signal reproduced by the high-speed search is displayed. In such a case, since such a last screen is after the necessary image has been taken, it is often not taken normally, and even if such a screen is used as an index image, the recorded content is judged well. There have been cases where it is not possible. That is, on the screen after the necessary image has been captured, the recorded content may not be able to be determined because, for example, the subject is out of focus or the imaging direction is different.

To solve such a problem, it is conceivable to use an apparatus as shown in FIG. 8, for example. That is, FIG. 8 is a block diagram showing a configuration of another embodiment of a video signal reproducing device to which the image display device of the present invention is applied. Although the embodiment of FIG. 8 shows a case where the video signal compressed by the above-described MPEG system is recorded on a tape-shaped recording medium, the present invention is applied to an arbitrary compression system. In addition, the present invention can be applied to a video signal recorded without compression. Further, the recording medium is not limited to a tape, but can be applied to other types of recording media such as a disk.

In FIG. 8, for example, a tape 1 as a recording medium is wound around a rotating drum (not shown) provided with a magnetic head 2 and transferred by a drive system (not shown). The tape 1 has, for example, MPE
A video signal compressed by the G system is recorded, and the video signal recorded on the tape 1 is reproduced through the magnetic head 2. Further, the reproduced signal from the magnetic head 2 is
The data is supplied to the reproduction processing unit 3 to extract a bit stream of, for example, the MPEG system, and the bit stream is supplied to a decoder circuit 4 of, for example, the MPEG system.

Thus, the compression at the time of recording is restored by the decoder circuit 4 and the video signal is reproduced. In other words, the decoder circuit 4 decodes a frame called an I-frame which can be independently decoded and provided, for example, every 15 frames from a video signal compressed by, for example, the MPEG system. Using the decoded I frame, frames called P and B frames formed by the difference between the frames are decoded. Thus, all frames forming the video signal are restored, and the video signal is reproduced.

In this apparatus, when reproduction is performed in a time series different from that at the time of recording such as a high-speed search, for example, only the above-described independently decodable I frames are sequentially decoded to form a video signal. You. Thus, for example, when an I frame is provided for every 15 frames of the video signal, only the I frame is reproduced, so that a high-speed search reproduction of 15 times speed is performed.
The video signal reproduced here is completed in one frame, and information added to the video signal is also obtained.

Then, the video signal restored by the decoder circuit 4 is used as an input video signal of the present invention, for example, 1
It is supplied to a sub-memory 91 consisting of a frame memory or a field memory for the screen. Further, the video signal read from the sub memory 91 and the video signal restored by the decoder circuit 4 are supplied to the selector 92. The video signal selected by the selector 92 is
For example, it is supplied to an image memory 5 composed of a frame memory or a field memory for one or a plurality of screens.

Further, for example, any condition of the input video signal detected by the decoder circuit 4, for example, the beginning of the input video signal, any index mark provided in the added information, or the recording in the added information A detection signal such as when the date and time data deviates from the additional information of the immediately preceding video signal by a predetermined time or more is supplied to the memory controller 6 that controls the sub memory 91, the image memory 5, and the selector 92 described above. Further, a synchronization signal such as horizontal / vertical / field discrimination from the decoder circuit 4 is supplied to the memory controller 6.

The address and the write / read control signal from the memory controller 6 are supplied to the sub-memory 91 and the image memory 5, respectively, and the selection signal from the memory controller 6 is supplied to the selector 92. As a result, for example, a video signal of an index image pasted at a predetermined position of the image memory 5 by reducing the input video signal is formed. Further, a video signal formed in the image memory 5 is taken out to an output terminal 7 as an output video signal. Further, a synchronization signal from the decoder circuit 4 is taken out to an output terminal 8.

In this device, the memory controller 6 performs, for example, the processing shown in the flowchart of FIG. That is, in FIG. 9, when the high-speed search is started, first, a reduced screen of the input video signal reproduced from the decoder circuit 4 is pasted at a predetermined position in the image memory 5 in step [1]. Here, it is assumed that the selector 92 normally selects the decoder circuit 4 side. Next, in step [2], it is determined whether an arbitrary condition, for example, an index mark has been detected in the input video signal.

If, for example, no index mark is detected in step [2] (No), step [4]
It is determined whether or not the pasting position of the reduced screen of the input video signal of the image memory 5 remains in the image memory 5, and when it remains (Y
es) returns to step [1], and the high-speed search processing up to this point is repeated. Thus, a reduced screen of the input video signal reproduced from the decoder circuit 4 is sequentially pasted at a predetermined position of the image memory 5. When the image memory 5 is repeatedly read, a search image is formed at the predetermined position.

On the other hand, in step [2], for example, when an index mark is detected (Yes), it is determined whether or not the index mark detected in step [21] is at the beginning of the input video signal. Is done. If the index mark detected here is the head of the input video signal (Yes), the input video signal reproduced from the decoder circuit 4 is stored in the sub memory 91 in step [23]. Further, in step [4], it is determined whether or not the pasted position of the reduced screen remains in the image memory 5, and if it remains (Yes), the process returns to step [1].

If the index mark detected in step [21] is not the beginning of the input video signal (No), the video signal stored in the sub memory 91 is stored in the image memory 5 in step [22]. Is pasted at the position. The selector 92 selects the sub memory 91 only at this time. Then, in step [3], the position where the reduced screen of the input video signal is pasted to the image memory 5 is updated to the next position. In step [23], the input video signal reproduced from the decoder circuit 4 is stored in the sub memory 91.

Further, in step [4], it is determined whether or not the position where the reduced screen is pasted remains in the image memory 5.
If there is any (Yes), the process returns to step [1]. Thus, when an index mark is detected, the paste position of the reduced screen of the input video signal is updated to the next position, a search image is formed at the paste position of the next reduced screen, and the previous reduced screen is formed. The screen at the time of the previous index mark is read from the sub-memory 91 and pasted at the pasting position, and the screen at the time of the new index mark is stored in the sub-memory 91.

In this way, the index images obtained by reducing the input video signal are pasted in order. In this case, since the first screen of the search image of the video signal reproduced by the high-speed search is displayed as an index image in this case, the correspondence between the search image and the index image is clear and the index image is displayed. The entire contents of the recording medium can be better grasped by the index image. If no pasting position remains in the above step [4] (No), the high-speed search process ends.

Therefore, in this embodiment, for example, an output video signal for displaying an index image as shown in FIG. That is, in FIG. 7, the image does not change at the index mark at the beginning of the input video signal at the start of the search, and the search image is displayed at the first pasting position, for example, as shown in A of FIG. After that, 2 including the beginning
Until the index index is detected, the search image of the input video signal is continuously displayed at the first pasting position as shown in FIG. 7B.

Further, when the above-mentioned second index mark is detected, the first screen of the search image of the input video signal is displayed at the first pasting position as an index image. As shown, the input video signal is displayed as a search image at the next pasting position. Also, the index picture of the first screen of each search picture is displayed in order for each subsequent detection of each index mark. For example, immediately after the ninth index mark is detected, as shown in FIG. Index picture ~
Then, the input video signal is displayed as a search image at the last pasting position.

When the tenth index mark is detected, as shown in FIG. 7E, the index picture of the first screen of each search picture is displayed in order for each index mark detected, and The search process ends. In this way, the index images in which the first picture of the input video signal for each index mark is reduced at the pasting position are formed and displayed. Although the number of index images to be displayed is nine in the embodiment of FIG. 7, this number may be more or less.

Therefore, in this embodiment, while searching for the screen displayed in the index image, the still images of the necessary screens are displayed side by side at the same time, so that the entire contents recorded on the recording medium can be grasped. In addition to being able to make a good judgment on the individual recorded contents, the correspondence between the search image and the index image can be made clear, and the index image of the first screen of the search image can be displayed, so that the It is possible to better understand the entire contents.

By the way, by using a frame memory, for example, a difference signal between the preceding and succeeding frames is detected, and the difference signal and the original signal are processed to reduce the noise in the video signal. Processing has been proposed. Here, such noise reduction processing is performed, for example, at the subsequent stage of the decoder circuit 4. However, such noise reduction processing is effective only during normal reproduction. In this case, the difference signal between the frames before and after the detection becomes extremely large and cannot be used.

FIG. 10 realizes an image display apparatus that forms the above-described index image at the time of high-speed search, for example, by using a frame memory used for such noise reduction processing. Although the embodiment of FIG. 10 shows a case where the video signal compressed by the above-described MPEG system is recorded on a tape-shaped recording medium, the present invention is applied to an arbitrary compression system. Along with
The present invention can also be applied to video signals recorded without compression. Further, the recording medium is not limited to a tape, but can be applied to other types of recording media such as a disk.

In FIG. 10, for example, a tape 1 as a recording medium is wound around a rotary drum (not shown) provided with a magnetic head 2 and transferred by a drive system (not shown). The tape 1 includes, for example, MP
A video signal compressed by the EG method is recorded, and the video signal recorded on the tape 1 is reproduced through the magnetic head 2. Further, a reproduction signal from the magnetic head 2 is supplied to a reproduction processing unit 3 to extract a bit stream of, for example, an MPEG system, and the bit stream is supplied to a decoder circuit 4 of, for example, an MPEG system.

As a result, the compression at the time of recording is restored by the decoder circuit 4, and the video signal is reproduced. In other words, the decoder circuit 4 decodes a frame called an I-frame which can be independently decoded and provided, for example, every 15 frames from a video signal compressed by, for example, the MPEG system. Using the decoded I frame, frames called P and B frames formed by the difference between the frames are decoded. Thus, all frames forming the video signal are restored, and the video signal is reproduced.

In this apparatus, when reproduction is performed in a time series different from that at the time of recording such as a high-speed search, for example, only the above-described independently decodable I frames are sequentially decoded to form a video signal. You. Thus, for example, when an I frame is provided for every 15 frames of the video signal, only the I frame is reproduced, so that a high-speed search reproduction of 15 times speed is performed.
The video signal reproduced here is completed in one frame, and information added to the video signal is also obtained.

Then, the video signal restored by the decoder circuit 4 is supplied as an input video signal of the present invention to an image memory 5 consisting of a frame memory or a field memory for one or more screens. Further, for example, arbitrary conditions of the input video signal detected by the decoder circuit 4;
For example, detection at the beginning of an input video signal, when an arbitrary index mark provided in added information, or when data of recording date and time in the added information is separated from additional information of the immediately preceding video signal by a predetermined time or more. The signal is supplied to the memory controller 6 for search described above.

The video signals on the input and output sides of the image memory 5 are supplied to a noise reduction memory controller 10 for performing noise reduction processing during normal reproduction. Further, a synchronization signal such as horizontal / vertical / field discrimination from the decoder circuit 4 is supplied to the memory controllers 6 and 10. Addresses and write / read control signals from the memory controllers 6 and 10 are selected by the selector 11 that can be switched between normal reproduction and search, and are supplied to the image memory 5.

Further, the video signal formed in the image memory 5 is taken out to the output terminal 7 as an output video signal. Further, a synchronization signal from the decoder circuit 4 is taken out to an output terminal 8. Thus, for example, during normal playback,
By detecting a difference signal between the previous and next frames using the image memory 5 and processing the difference signal and the original signal, for example, the noise in the video signal is reduced. The video signal is reduced to form a video signal of an index image pasted at a predetermined position in the image memory 5.

Therefore, in this embodiment, while the screen displayed in the index image is searched, the still images of the required screen are displayed side by side at the same time, so that the entire contents recorded on the recording medium can be grasped. The present invention can be implemented with an extremely simple configuration by making it possible to judge each recorded content satisfactorily and to use the image memory used for this processing as, for example, the frame memory used for noise reduction processing during normal reproduction. Is what you can do.

Thus, according to the above-described image display device, an image memory for one screen or a plurality of screens for temporarily storing images, an input video signal is reduced and pasted at a predetermined position in the image memory, A memory controller for repeatedly reading the entire screen of the image memory to form an output video signal, wherein the memory controller sequentially updates and pastes the reduced input video signal to a predetermined position in the image memory, When an arbitrary condition is detected from the video signal, the update of the paste is stopped, and the screen displayed in the index image is reduced by reducing the input video signal and pasting it to the next position in the image memory. While searching, the still images of the required screens are displayed side by side at the same time. Those capable of recording contents of the decision well.

In the above-described embodiment, when a tape is used as the recording medium, the content of the recorded image is determined by using the time required for the high-speed search in a device that traces the recording medium at the search magnification set during the high-speed search. Although it is possible to simultaneously perform the confirmation and the list display of the index images, in the present invention, for example, even in a recording medium such as an optical disk which can be randomly accessed, not only the first image in the spliced portion but also intermittently A similar function can be realized by performing a search operation while reading an image.

Further, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0071]

Therefore, according to the first aspect of the present invention, while a screen displayed in an index image is searched, a still image of a required screen is displayed side by side at the same time. It is possible to satisfactorily grasp the entire contents and judge the individual recorded contents.

According to the second aspect of the present invention, the detection of an arbitrary condition is performed including the beginning of the input video signal, and when the arbitrary condition is detected, the reduced input video signal at that time is converted into an image. The update is stopped by pasting it to the specified location in the memory, and by reducing the input video signal and pasting it to the next location in the image memory, it is possible to search for the screen displayed in the index image and at the same time By displaying the still images of various screens side by side, it is possible to grasp the entire contents recorded on the recording medium and to judge the individual recorded contents satisfactorily.

Further, according to the third aspect of the present invention, the detection of an arbitrary condition is performed except for the beginning of the input video signal, and when the arbitrary condition is detected, the immediately preceding reduced input video signal is stored in the image memory. By stopping the update by pasting it at a predetermined position, and reducing the input video signal and pasting it at the next position in the image memory, the correspondence between the search image and the index image can be made clear. A search image related to the last index image can also be displayed.

According to the fourth aspect of the present invention, the detection of an arbitrary condition is performed including the beginning of an input video signal, and when an arbitrary condition is detected, a sub-storage for storing the input video signal at that time is detected. Has a memory, when any condition is detected except the beginning of the input video signal, reduces the video signal stored in the sub memory and pastes it at a predetermined position in the image memory and stops updating the pasting By storing the input video signal at that time in the sub memory and reducing the input video signal and pasting it to the next position in the image memory, the correspondence between the search image and the index image can be made clear. Further, by displaying the index image of the first screen of the search image, the entire contents of the recording medium can be grasped better.

According to the fifth aspect of the present invention, a plurality of screens are provided in the image memory, and when pasting of the reduced input video signal exceeds one screen, it is pasted to the next screen. By searching for the screen displayed in the index image and displaying the still images of the required screens side by side at the same time, it is possible to comprehend the entire contents recorded on the recording medium and judge the individual recorded contents. And the number of displayed still images is 1
By increasing the number of index images from that of one index image, for example, it is possible to perform good display even on a recording medium capable of recording for a long time.

Thus, in the conventional apparatus, for example, the conventional high-speed search reproduction is not suitable for the purpose of grasping the entire recorded contents, and the conventional index image has only one screen such as the beginning. However, according to the present invention, it is possible to easily solve these problems, although it is sometimes difficult to determine the recorded contents because of the display of the.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a video signal reproducing device to which an image display device of the present invention is applied.

FIG. 2 is a flow chart of one embodiment for explaining the operation.

FIG. 3 is a diagram for explaining display of an index image.

FIG. 4 is a flowchart for explaining the operation.

FIG. 5 is a flowchart of another embodiment for explaining the operation.

FIG. 6 is a flowchart for explaining still another embodiment of the operation;

FIG. 7 is a diagram for explaining display of an index image.

FIG. 8 is a block diagram showing a configuration of another embodiment of a video signal reproducing device to which the image display device of the present invention is applied.

FIG. 9 is a flowchart of yet another embodiment for explaining the operation.

FIG. 10 is a block diagram showing a configuration of still another embodiment of a video signal reproducing device to which the image display device of the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tape as a recording medium, 2 ... Magnetic head, 3 ... Reproduction processing part, 4 ... Decoder circuit of MPEG system, 5
... Image memory, 6 ... Memory controller, 7 ... Video signal output terminal, 8 ... Sync signal output terminal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference)

Claims (5)

[Claims] An image memory for one screen or a plurality of screens for temporarily storing an image, an input video signal being reduced and pasted at a predetermined position in the image memory, A memory controller for repeatedly reading out the whole to form an output video signal, wherein the memory controller sequentially updates and pastes the reduced input video signal at a predetermined position in the image memory, and And stopping the update of the pasting when an arbitrary condition is detected from the input image signal, and reducing and pasting the input video signal to the next position in the image memory. 2. The image display device according to claim 1, wherein the detection of the arbitrary condition is performed including the beginning of the input video signal, and when the arbitrary condition is detected, the reduced size at that time is detected. An image display device, wherein an input video signal is pasted at a predetermined position in the image memory to stop updating, and the input video signal is reduced and pasted at a next position in the image memory. 3. The image display device according to claim 1, wherein the detection of the arbitrary condition is performed except for the beginning of the input video signal, and when the arbitrary condition is detected, the reduced size immediately before the detection is performed. An image display device, wherein an input video signal is pasted at a predetermined position in the image memory to stop updating, and the input video signal is reduced and pasted at a next position in the image memory. 4. The image display device according to claim 1, wherein the detection of the arbitrary condition is performed including the beginning of the input video signal, and when the arbitrary condition is detected, the input image at that time is detected. A sub-memory for storing signals, when the arbitrary condition is detected except for the beginning of the input video signal, reducing the video signal stored in the sub-memory to a predetermined position in the image memory Pasting to stop the updating of the pasting, storing the input video signal at that time in the sub-memory, reducing the input video signal and pasting it to the next position in the image memory. Image display device. 5. The image display device according to claim 1, wherein the image memory is provided with a plurality of screens, and when pasting of the reduced input video signal exceeds one screen, it is pasted on the next screen. An image display device, characterized in that: