JP4349324B2 - Video signal playback device - Google Patents

Description

The present invention relates to a video signal playback apparatus, and more particularly to an improvement for displaying a normal playback video from an appropriate start position when shifting from fast forward / reverse fast forward playback to normal playback by an instruction operation.

Video recorders that record and play back television (TV) broadcast programs using hard disks and DVDs are remarkably widespread, and video recorders using these recording media have a tremendous length compared to VTRs (video tape recorders). Time recording is possible, and since it is a disc-shaped recording medium, it has the convenience of being able to be played back easily and quickly. For this reason, a very large number of broadcast programs are often recorded on the hard disk or the like of a video recorder, and there are many cases where drama programs are recorded for the entire story.

When searching for a part you want to watch during playback of a recorded broadcast program or skipping the CM broadcast time zone, set the fast forward / reverse fast forward playback mode and watch the video sent by dropping frames. The operation to return to the normal playback mode is performed at the timing when the video of is displayed. In that case, there will be a delay of reaction time until the operator recognizes the video and presses the normal playback button, and the video at the time when the video recorder accepts the operation and starts normal playback. Is advanced in time in the fast forward playback mode, and delayed in time in the reverse fast forward playback mode. That is, in the frame skipping state in the fast forward / reverse fast forward playback mode, the frame is displayed from the subsequent / previous frame by the number of frames corresponding to the reaction time and cannot be displayed from the desired video.

Incidentally, regarding the display at the time of transition from fast forward playback to normal playback, the following Patent Document 1 states that “the display time of multimedia data being played back and the normal playback transition from the start of display of the multimedia data being played back” Based on the time until the input timing of the request, by specifying multimedia data corresponding to the input timing for fast-forwarding cancellation, normal playback is executed in reverse to the multimedia data corresponding to the input timing. Video playback apparatus and video playback method "have been disclosed. More specifically, “Specify the video corresponding to the fast-forward release input timing based on the time axis of the video being played back on the display device, read it backwards, and then perform normal playback. Will resume. "
JP 2004-318966 A

By the way, the speed range of fast forward / reverse fast forward playback mode has become larger with the recent video recorders that can record for a long time, and the fast forward speed of about 5 to 30 times that is a general fast forward speed. Is possible. Therefore, at high speed fast forward, the delay of the reaction time from the image recognition by the operator to the normal playback button operation greatly affects the deviation of the normal playback start position, and it becomes more difficult to display from the desired video. In many cases, reverse fast-forwarding must be repeated for adjustment. In addition, the video playback apparatus, video playback method, and the like of Patent Document 1 do not consider such operational delays, and the same inconvenience is inevitably caused. Accordingly, the present invention provides a video signal playback apparatus capable of starting playback from a desired video more accurately when an instruction operation is performed to shift from the fast forward / reverse fast forward playback mode to the normal playback mode. With the goal.

The present invention can selectively set a normal playback mode, a fast forward playback mode, and a reverse fast forward playback mode, and sequentially decodes compressed image data read from a recording medium frame by frame in the normal playback mode. In the fast-forward playback mode and the reverse fast-forward playback mode, the fast-forward playback mode or the reverse fast-forward playback mode is set in the video signal playback apparatus that decodes and plays back frames at intervals corresponding to each set speed magnification. The number of frames set with a tendency to increase / decrease according to the set speed magnification from the first sequence frame and a frame for each thinning interval corresponding to the set speed magnification (hereinafter referred to as “first series frame”). Decoding means for decoding a frame preceding or following in time (hereinafter referred to as “second sequence frame”), and the decoding means First storage means for storing the first sequence frame that has been issued, second storage means for storing the second sequence frame decoded by the decoding means, and the second sequence frame stored in the second storage means Reduced image generation means for generating image data with a reduced image size, image data of the first sequence frame stored in the first storage means, and the second sequence frame generated by the reduced image generation means Image synthesizing means for synthesizing the reduced image data to generate a frame of the parent-child screen, and reproducing and outputting the parent-child screen generated by the image synthesizing means in the fast-forward playback mode and the reverse fast-forward playback mode. The present invention relates to a video signal reproducing apparatus.

According to the video signal playback apparatus of the present invention, in the fast forward / reverse fast forward playback mode, a parent / child screen having the first sequence frame as a parent screen and the second sequence frame as a child screen can be displayed and reproduced. The operation for shifting to the normal playback mode can be performed while confirming the previous / next video on the sub-screen for the time set in accordance with the increase / decrease tendency corresponding to.

In the present invention, it is desirable that the reduced image generating means is a means for generating reduced image data of the second series frame at a reduced display magnification set with an increasing / decreasing tendency corresponding to the set speed magnification. By adding this function to the reduced image generation means, the visibility of the sub-screen image when fast forward / reverse fast forward is set is improved.

In the present invention, the image synthesizing unit may be configured to display the child screen display position by the reduced image data of the second sequence frame with respect to the parent screen by the image data of the first sequence frame in the fast-forward playback mode. The center of the screen is located on the right side of the center of the parent screen, and the amount of deviation to the right side is set in an increasing / decreasing tendency according to the set speed magnification. In the reverse fast-forward playback mode, the center of the child screen is set. Is located on the left side of the center of the main screen, and the amount of deviation to the left side is preferably set to increase or decrease in accordance with the set speed magnification to synthesize image data. By adding this function to the image synthesizing means, it becomes easy to check which setting state is in the fast-forward playback mode or reverse fast-forward playback mode and which speed magnification is set in each mode.

The video signal reproducing apparatus of the present invention has the following configuration, and thus has the following effects. When transitioning from fast forward / reverse fast forward playback mode to normal playback mode, normal playback can be performed from a desired video at an appropriate operation timing even if there is a reaction time delay between video recognition and transition operation. . In particular, since the time difference between each image on the child screen and the parent screen is increased or decreased according to the set speed magnification, a certain operation accuracy can be ensured even if fast forward / reverse fast forward is performed at high speed. In addition, by changing the reduced display magnification of the small screen with the reduced image generation means with a tendency to increase / decrease according to the set speed magnification of fast forward / reverse fast forward playback, even when fast forward / reverse fast forward is set, To prevent the deterioration of the operation accuracy. Furthermore, by changing the position of the sub-screen in the parent screen according to the setting state of the fast-forward / reverse fast-forward playback mode by the image compositing means, it is possible to easily confirm the setting conditions of the fast-forward / reverse fast-forward playback mode. Improve.

Embodiments of a video signal reproduction apparatus according to the present invention will be described below in detail with reference to the drawings.
[Embodiment 1]
FIG. 1 is a block diagram of a digital video recorder equipped with a hard disk device. The recording system of the video recorder 1 determines which of the TV tuner unit 3 that receives TV broadcast radio waves via the antenna 2 and the received video signal of the TV tuner unit 3 or an externally input video signal is used as a recording signal. The switch circuit 4 to be selected, the A / D converter 5 for converting the video signal selected by the switch circuit 4 into a digital signal, and the image data after A / D conversion are encoded by the MPEG (Moving Picture Experts Group) -2 system The image data encoded and compressed by the encoder 6 is recorded on a hard disk by a hard disk device (HDD) 7. On the other hand, the playback system displays a parent / child screen based on the image data of the two series of frames decoded by the decoder 8 in the fast forward / reverse fast forward playback mode as will be described later. A parent-child screen generation unit 9 to be generated, a D / A converter 10 that converts image data output from the parent-child screen generation unit 9 into an analog signal, and a signal for displaying various control setting information on a part of the display are output. An OSD (On Screen Display) generation unit 11 for performing the addition, and a D / A converter 10 and an addition circuit 12 for adding and synthesizing the output signals of the OSD generation unit 11. The output signal of the addition circuit 12 is an external TV display 13. Is output and displayed.

The control system also includes a light receiving unit 15 that receives near-infrared light modulated by an instruction signal from an external remote controller 14, and an interface (I / F) 16 that demodulates the output signal of the light receiving unit 15 into code data. The control unit 17 takes in the instruction code of the remote controller 14 from the I / F 16 and controls the entire system, and selects an input signal, selects a TV broadcast, sets a recording / playback mode by an instruction operation from the remote controller 14, Various settings and controls such as setting of fast-forward / reverse fast-forward playback mode and setting of speed magnification are made.

The video recorder 1 of this embodiment is characterized in that when the fast-forward / reverse fast-forward playback mode is set by the remote controller 14, two series of fast-forward / reverse fast-forward playback frames having a time difference from the video data read from the HDD 7 are displayed. It is read and decoded, and the parent / child screen generation unit 9 combines the two series of video data with image data to be displayed on the parent screen side and the child screen side, respectively. Here, the parent-child screen generation unit 9 controls the writing and reading of the two frame memories 21 and 22 and the two series of image data decoded by the decoder 8 to and from the frame memories 21 and 22, as shown in FIG. The R / W control unit 23 for performing image data, the reduced image generating unit 24 for reducing the image data in the frame memory 22 to the child screen size, the image data of one series in the frame memory 21 and the other reduced by the reduced image generating unit 24 The image synthesizing unit 25 generates image data of the parent / child screen by synthesizing with the series of image data.

Hereinafter, in the video recorder 1, in the state where the TV broadcast program recorded and recorded on the hard disk is being played in the normal playback mode, the video portion to be viewed is searched using the fast-forward playback function, and the playback is performed from the portion in the normal playback mode. The operation in this case will be described based on the flowchart of FIG. First, the parent / child screen generation unit 9 is in a through-pass state in the normal reproduction (× 1) mode. In other words, the compressed image data read from the hard disk by the HDD 7 is decoded by the decoder 8 and once written in the frame memory 21 of the parent-child screen generation unit 9 and read by the image synthesis unit 25. The image data is directly output to the D / A converter 10 without being processed, and the D / A converted image data is displayed on the TV display 13 via the addition circuit 12 (S11).

Here, when the operator gives an instruction to set the fast-forward playback (× 20) mode from the remote controller 14, the frame that was being played back immediately before is indicated by G [X-1]; No.), the HDD 7 reads an MPEG GOP (Group of Pictures) including the frame: G [X] from the hard disk, decodes the GOP by the decoder 8, and decodes the decoded data of the frame: G [X] to the frame. Write to the memory 21 (S14). Further, the HDD 7 reads a GOP including a frame G [X-300] 300 frames before the frame G [X] from the hard disk, and a frame G [X-300] after the GOP is decoded by the decoder 8. Is decoded in the frame memory 22 (S15).

Next, the data of the frame: G [X-300] in the frame memory 22 is read to the reduced image generating unit 24, and the reduced image generating unit 24 generates reduced image data: S [X-300] having a predetermined reduction magnification. Then, the G [X] decode data of the frame memory 21 and the reduced image data: S [X-300] are synthesized into one frame of image data in the image synthesis unit 25 (S16). The synthesized image data is converted into an analog signal by the D / A converter 10 and then displayed on the TV display 13 through the adding circuit 12 (S16).

The processing from step S14 to step S16 is performed for two series of frames: G [X + 20] and G [X-300 + 20] to be read next based on the 20-times fast-forward speed setting condition. The composite image data is created in the same procedure, and thereafter, two series of frames: G [X + 20i], G [X-300 + 20i] (i = 2) until the normal playback (× 1) mode is set. , 3, 4,..., The same processing is performed to display the frame of the composite image data on the TV display 13 (S17 → S18 → S14 to S16).

Therefore, the parent-child screen image as shown in FIG. 4 is displayed on the TV display 13. That is, an image of frame: G [X + 20i] is displayed on the parent screen 51 side, an image of frame: G [X-300 + 20i] is displayed on the child screen 52 side, and an image on the child screen 52 side is The image is 300 frames before the image on the parent screen 51 side. Here, 300 frames corresponds to 10 seconds in terms of time in the normal playback (× 1) mode, and 0.5 seconds in terms of time in the fast forward (× 20) mode.

The operator is in a state of waiting for the video to be viewed while watching the TV display 13 from the time when the fast-forward (× 20) mode is set, and immediately after confirming the display of the video, Returning to the reproduction (× 1) mode, the broadcast program is viewed (S17, S19). In that case, generally, reaction time is interposed from the confirmation of the display video to the setting of the normal playback (× 1) mode (button operation), and in any case, a delay of about 0.5 sec occurs. However, as described above, since the video 0.5 sec before the video on the main screen 51 is displayed on the sub-screen 52 side, the operator is in the normal playback (× 1) mode while watching the sub-screen 52. By performing the setting operation, it is possible to perform an operation at a substantially accurate timing. That is, since the normal playback (× 1) mode is set in advance in consideration of the delay of the operation timing, the playback in the normal playback (× 1) mode can be accurately started from the video to be viewed.

By the way, although the case where the fast-forward playback mode is set with the speed magnification setting condition of 20 times has been described above, a general video recorder can set the speed magnification in the range of 5 times to 30 times. In many cases, for example, a method is employed in which the setting can be increased by 5 times from 5 times to 30 times by repeatedly pressing the fast-forward playback mode button on the remote controller. Therefore, assuming that the video recorder 1 can set a speed magnification of 5F (where F = 1, 2, 3, 4, 5, 6) in the fast-forward playback mode, FIG. 5 shows an operation in the case of switching the reproduction mode → fast forward reproduction mode → normal reproduction mode].

As is clear from a comparison between FIG. 5 and FIG. 3, the case of F = 4 in FIG. 5 corresponds to the case of FIG. 3, and the basic procedure is the same for both. Therefore, when the fast-forward playback mode is performed at a speed setting of 5F times, the frames for each 5F frame: G [X + 5Fi], S [X-75F + 5Fi] on each of the main screen 51 and the subscreen 52. As shown in steps S25 and S26 of FIG. 5, the frame displayed on the sub-screen 52 side: S [X-75F + 5Fi] is 75F frames than the frame on the main screen 51 side. A minute ago. In that case, when F = 1,2,3,4,5,6 and a speed magnification of 5/10/10/15/20/25/30 is set, as shown in FIG. The image on the side of the small screen 52 corresponds to the image in the normal playback (× 1) mode, 2.5 seconds before, 5 seconds before, 7.5 seconds before, 10 seconds before, 12.5 seconds before, and 15 seconds before. When converted to the playback mode, it corresponds to an image 0.5 sec before. This makes it possible for the operator to always switch to the normal playback (× 1) mode at the same operation timing while watching the image on the sub-screen 52 side, regardless of the setting of the speed magnification. Operability can be secured.

In the above, the case of the fast-forward playback mode has been described. However, in the case of the reverse fast-forward playback mode, only the front and back are temporally reversed, and similar functions and effects can be realized. Incidentally, in the reverse fast-forward playback mode, the frame displayed on the parent screen 51 side is G [X-5Fi], and the frame displayed on the child screen 52 side is S [X + 75F-5Fi]. In step S24 and step S25 in FIG. 5, GOP is read from the hard disk in each step, but a small speed magnification is set, and frames: G [X + 5Fi] and G [X -75F + 5Fi] belongs to the same GOP, the GOP can be read only once in step S24.

[Embodiment 2]
According to the parent-child screen display function at the time of setting the fast-forward playback mode in the video recorder 1 of the first embodiment, as shown in FIG. In general, when the speed magnification in the fast forward playback mode increases, it becomes difficult to check the change state of the image. As a result, when the fast forward playback mode at a large speed magnification is set, the operation timing for the normal playback (× 1) mode May be delayed.

Therefore, in this embodiment, a method is adopted in which the size of the child screen is increased as the speed magnification increases to make it easy to see. The system configuration of the video recorder in this embodiment is the same as that in the first embodiment, and the same applies to the frame reading / decoding process and the writing to the frame memories 21 and 22 in the fast-forward playback mode. The reduced image generation unit 24 of the screen generation unit 9 changes the image size of the child screen according to the speed magnification.

The operation procedure in the case of switching from [normal playback mode → fast forward playback mode → normal playback mode] in this embodiment is shown in the flowchart of FIG. As is apparent from a comparison of FIG. 5 and FIG. 5, the procedure of this embodiment is different from that of the first embodiment in that step S22a is added, and generation of reduced image data in step S26 ′ is performed. The reduction is performed at the reduction ratio set in step S22a. Specifically, when the fast-forward playback mode is set at a speed magnification of 5F (where F = 1, 2, 3, 4, 5, 6), the control unit 17 generates a reduced image of the parent-child screen generation unit 9 The reduction ratio of the unit 24 is set as 0.05 (F + 4) (S22, S22a), and the reduced image generation unit 24 sets the reduction ratio: 0.05 (F + 4) and the frame of the frame memory 22: G [X-75F + 5Fi] image data is reduced, and the image composition unit 25 synthesizes the reduced image data: S [X-75F + 5Fi] with the frame: G [X + 5Fi] image data in the frame memory 21 (S26). ').

As described above, when the reduction magnification in the reduced image generation unit 24 is variably set in proportion to the speed magnification in the fast-forward playback mode, the size of the child screen 52 increases as the speed magnification increases, as shown in FIG. 52 images are easy to see. That is, for example, when the speed magnification is set to 15 times (F = 3) and 30 times (F = 6), the size of the child screen 52 is the child screen when the speed magnification is 5 times (F = 1). It becomes 1.4 times and 2 times respectively for the size of 52. Therefore, even if the fast-forward playback mode is set with a large speed magnification, the switching operation to the normal playback (× 1) mode can be performed with the same reaction time as in the setting state with a small speed magnification. In this embodiment, the case of the fast-forward playback mode has been described. Similarly, in the case of the reverse fast-forward playback mode, the reduction magnification of the reduced image generation unit 24 is set in proportion to the speed magnification (absolute value). Good.

[Embodiment 3]
In general, a video recorder can confirm that the fast-forward / reverse fast-forward playback mode is being set and the set speed magnification in the upper right area of the screen. For example, in the circuit configuration of FIG. 1, when the fast forward / reverse fast forward playback mode is set, the control unit 17 notifies the OSD generation unit 11 of the mode setting and the speed magnification, and the OSD generation unit 11 The notification information is output as character data to the adding circuit 12 and displayed in a predetermined area in the display screen of the TV display 13. However, in the fast-forward / reverse fast-forward playback mode, the transition of the video is fast, so that it is often difficult to visually recognize the character information as compared with the normal playback (× 1) mode.

Therefore, in this embodiment, in the video recorder 1 of the first embodiment, it is possible to easily visually recognize which speed magnification is set between the fast-forward playback mode and the reverse fast-forward playback mode depending on the display position of the sub-screen 52. . Therefore, in this embodiment as well, the system configuration of the video recorder and the procedure for frame reading / decoding processing and writing to the frame memories 21 and 22 in the fast-forward playback mode are the same as in the first embodiment. The image synthesizing unit 25 of the screen generating unit 9 is characterized in that the reduced image synthesized position is changed according to the difference between the fast-forward mode and the reverse fast-forward mode and the set speed magnification in each mode.

FIG. 9 is a flowchart showing an operation procedure when switching between [normal playback mode → fast forward / reverse fast forward playback mode → normal playback mode] in this embodiment. In the flowchart, the procedure according to the feature is in steps S33 and S37. When the fast forward / reverse fast forward reproduction (× ± 5F) mode is set, the image synthesizing unit of the parent-child screen generating unit 9 according to the setting condition 25, the reduced image combining position is set (S32, S33), and the image data after reducing the image data on the frame memory 22 side with the image data on the frame memory 21 side is combined and displayed at the set combining position. (S37).

The composition position is set so that the parent-child screen is displayed as shown in FIG. 10 depending on whether the fast-forward playback mode or reverse fast-forward playback mode is set and at what speed magnification. Is done. That is, when the fast-forward playback mode is set, the center of the sub screen 52 is displayed on the right side of the center of the main screen 51, and the position shifted to the right side as the set speed magnification increases. On the other hand, when the reverse fast-forward playback mode is set, the display position is set in the reverse relation to the fast-forward playback mode.

Accordingly, when the operator sets the fast forward / reverse fast forward playback mode and the speed magnification, the operator can visually recognize the setting condition from the display position of the sub-screen 52 of the TV display 13, and fast forward as character information. / There is no inconvenience that it is difficult to confirm the setting conditions as in the case of displaying in the reverse fast-forward screen.

The present invention can be applied to a video signal playback apparatus capable of searching by setting a fast forward / reverse fast forward playback mode in order to perform normal playback from a desired video position, such as a video recorder.

It is a block diagram of the video recorder which concerns on embodiment of the video signal reproduction | regeneration apparatus of this invention. It is a block diagram which mainly shows the structure of a parent-child screen generation part. 6 is a flowchart showing an operation procedure when switching from [normal playback mode → fast forward playback (× 20) mode → normal playback mode] in the first embodiment. 6 is a diagram illustrating a display mode of a parent-child screen when the fast-forward playback (× 20) mode is set in Embodiment 1. FIG. 6 is a flowchart showing an operation procedure when switching from [normal playback mode → fast forward playback (× 5F) mode → normal playback mode] in the first embodiment. 6 is a diagram illustrating a display mode of a parent-child screen when a fast-forward playback (× 5F) mode is set in Embodiment 1. FIG. 10 is a flowchart showing an operation procedure when switching from [normal playback mode → fast forward playback (× 5F) mode → normal playback mode] in the second embodiment. It is a figure which shows the display mode of a parent-child screen when the fast-forward reproduction mode is set in Embodiment 2, (A), (B), (C) are 5 times, 15 times, and 30 times the speed magnification, respectively. Corresponds to the case. 14 is a flowchart showing an operation procedure when switching between [normal playback mode → fast forward / reverse fast forward playback (× ± 5F) mode → normal playback mode] in the third embodiment. FIG. 10 is a diagram illustrating a display mode of a parent-child screen when the fast forward / reverse fast forward playback mode is set in the third embodiment, and (A), (B), and (C) are 5 times, 15 times, and 30 times, respectively. Corresponding to the case where the fast forward playback mode is set with the speed magnification, (D), (E), and (F) are set with the reverse fast forward playback mode with the speed magnification of 5 times, 15 times, and 30 times, respectively. Corresponds to the case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Video recorder, 2 ... Antenna, 3 ... TV tuner part, 4 ... Switch circuit, 5 ... A / D converter, 6 ... Encoder, 7 ... HDD (hard disk drive), 8 ... Decoder, 9 ... Parent-child screen generation part DESCRIPTION OF SYMBOLS 10 ... D / A converter, 11 ... OSD generating part, 12 ... Adder circuit, 13 ... TV display, 14 ... Remote control, 15 ... Light receiving part, 16 ... Interface, 17 ... Control part, 21, 22 ... Frame memory, 23: R / W control unit, 24: Reduced image generation unit, 25: Image composition unit, 51: Parent screen, 52: Sub-screen.

Claims (3)

It is possible to selectively set a normal playback mode, a fast-forward playback mode, and a reverse fast-forward playback mode. In the normal playback mode, the compressed image data read from the recording medium is sequentially decoded and played back one frame at a time. In the fast-forward playback mode and the reverse fast-forward playback mode, in the video signal playback apparatus for decoding and playing back frames at intervals corresponding to each set speed magnification,
When the fast-forward playback mode or the reverse fast-forward playback mode is set, the set speed is determined based on a frame at each thinning interval corresponding to the set speed magnification (hereinafter referred to as “first sequence frame”) and the first sequence frame. Decoding means for decoding a frame preceding or following in time (hereinafter referred to as a “second sequence frame”) by the number of frames set with an increase / decrease tendency according to the magnification;
First storage means for storing the first sequence frame decoded by the decoding means;
Second storage means for storing the second sequence frame decoded by the decoding means;
Reduced image generation means for generating image data obtained by reducing the image size of the second sequence frame stored in the second storage means;
Image composition for synthesizing the image data of the first sequence frame stored in the first storage means and the reduced image data of the second sequence frame generated by the reduced image generation means to generate a frame of a parent-child screen A video signal reproducing apparatus for reproducing and outputting the parent-child screen generated by the image synthesizing means in the fast forward reproduction mode and the reverse fast forward reproduction mode.   2. The video signal reproducing apparatus according to claim 1, wherein the reduced image generation unit is configured to generate reduced image data of the second sequence frame at a reduced display magnification set with an increase / decrease tendency corresponding to the set speed magnification. The image synthesizing means;
About the display position of the child screen by the reduced image data of the second sequence frame relative to the parent screen by the image data of the first sequence frame,
In the fast-forward playback mode, the center of the child screen is located on the right side of the center of the parent screen, and the deviation amount to the right side is set with an increasing / decreasing tendency according to the set speed magnification,
In the reverse fast-forward playback mode, the center of the child screen is located on the left side of the center of the parent screen, and the deviation amount to the left side is set with an increasing / decreasing tendency corresponding to the set speed magnification. The video signal reproducing apparatus according to claim 1, wherein the video signal reproducing apparatus is configured to perform synthesis.

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