KR100262238B1 - Image switching apparatus - Google Patents

Abstract

An image switching device that performs fade in / fade out processing between adjacent video recording files includes a multiplier that multiplies the decoded video data by a multiplication factor (1-km), and multiplies the multiplication factor (km) by the output data of the data output circuit. A multiplier for multiplying and a data synthesizer for synthesizing the result of multiplication from each multiplier are included. The image switching device configured as described above fades out without changing the original video data in the fade process by controlling the multiplication factor (km) at the junction between the files whose mixing rate of the fading color data with respect to the decoded color data increases or decreases gradually. / Fade in

Description

Image switching device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image switching device, and more particularly, to an image display system that reads, decodes, and reproduces video data from a recording medium such as a video CD (compact disc) or a photo CD in which encoded and compressed video data is recorded in file units. The present invention relates to an image switching device for performing a fade out / fade in process at a junction between accesses of each file.

Background Art [0002] AV (audio-visual) systems capable of simultaneously playing back images and audio from video CDs and photo CDs, which are variants of audio-only CDs, have recently become popular as karaoke systems.

In addition, with the full-fledged multimedia era, DVD (Digital Video Disc) standards have been defined, and various AV systems compatible with DVD have been developed.

The video data of each scene and the audio data corresponding to each scene are compressed by an MPEG (Movie Expert Group) system, recorded in separate files on such a disc, and continuous when video data is reproduced by an AV system. The video data is played back by or selectively accessing each file and decoding the data stream of the video data so read.

In the aforementioned system, since access is performed on a file basis, a scene associated with a file is suddenly displayed on a screen having an image of a scene associated with a previous file, which is destroyed due to the completion of playback and display of the scene, The switching of the scene becomes very unnatural.

Although the unnatural problem of scene switching can be eliminated by employing the encoded video data obtained by the fade out process and the fade in process in the header part and the end part of each file, the close-in and fade-out of the original video data is performed for each file. Out processing is very complicated and requires modification of the original video data.

When a search mode in which a specific file is specified is instructed, the operation of the system is shifted to the access of the specific file after the access to the previous file currently being played is terminated during the reproduction process. Therefore, the image related to the next file is reproduced through the fade in process, but the image of the file currently being reproduced is suddenly terminated.

1 is a circuit diagram of a video / audio reproduction system using a video CD according to a first embodiment of an image switching device of the present invention.

Fig. 2 is a flow chart showing operation of the system when setting fade in / fade out processing conditions.

Fig. 3 is a flowchart showing a fade out processing operation in the first embodiment.

Fig. 4 is a flowchart showing a fade in processing operation in the first embodiment.

Fig. 5 shows a time series state of fade out / fade in processing of data streams of files Fp and Fs.

Fig. 6 is a diagram showing a screen change of a monitor by fade out / fade in processing.

Fig. 7 is a flowchart showing the operation of the fade out process in the second embodiment of the image switching device of the present invention.

Fig. 8 is a flowchart showing operation of the fade in process in the second embodiment.

* Explanation of symbols for main parts of the drawings

14: CD decoder / servo control circuit 15: servo circuit

18, 23: microcomputer circuit 21: driver

24: Video CD decoder 31: RISK processor

33, 34: decoder 35: DRAM controller

36: video display processor 43: audio signal processing circuit

In order to solve the above-mentioned problems, an object of the present invention is used in the above-described image display system for a video CD or a photo CD, and is a file which is always reproduced at present, regardless of the timing of the file selection and without having to modify the original video data. There is provided an image switching device for reproducing an image of a file through a fade-in process after fading out and processing an image of.

Another object of the present invention is to provide an image display system for selecting one of a plurality of files recorded as encoded video data, reading the video data from the selected file, decoding, reading, and displaying the read encoded data. It is used to provide an image switching device for switching an image of a file currently displayed according to a selection command from an operation unit or a selection command which is control data included in a data stream of video data.

Another object of the present invention is an image display system which selects one of a plurality of files recorded as encoded video data, reads the video data from the selected file, decodes, reads and reproduces the read encoded data. An image switching device for use in a video switching apparatus comprising: data generating means for generating fade video data, fade out condition setting means for setting a fade out time and a maximum mixing ratio of the fade video data to the decoded video data; Data synthesizing means for synthesizing the decoded video data with the fade video data from the data generating means while changing the mixing ratio of the fade video data to the decoded video data, and in response to the selection command, Data synthesis And a fade out control means for controlling the data combining means to gradually increase the data mixing rate from 0 to the maximum mixing rate within the fade out time set by the fade out condition setting means. .

Regardless of the timing of the image switching selection command, the fade-out control means may gradually increase the data mixing rate of the fade video data to the decoded video data based on the conditions of the time and the mixing rate set by the fade out condition setting means. By this configuration of controlling the data synthesizing means, it is possible to fade out and terminate the image currently being played. The fade out condition setting means may be a means capable of arbitrarily setting a condition from an external operation unit, or a means including a preset internally set condition and fixedly using one of the conditions. In addition, it is possible to fix one of the conditions set by the fade out condition setting means and set another condition arbitrarily.

Still another object of the present invention is to display an image which selects one of a plurality of files recorded as encoded video data, reads the video data from the selected file, decodes the read encoded data, plays back and displays it. An image switching device for a system, comprising: data generating means for generating fade video data, fade in condition setting means for setting a fade in time and a maximum mixing ratio of the fade video data to the decoded video data; Data synthesizing means for synthesizing the decoded video data with the fade video data from the data generating means while changing the mixing ratio of the fade video data to the decoded video data, and a file selected according to the selection command; Encoded video Detection means for determining whether or not decoding of the first frame data or field data of the data has been completed; and when the completion of the decoding is detected by the detection means, the data mixing rate of the data synthesizing means is a fade-in condition setting means. And a fade in control means for controlling the data synthesizing means to gradually decrease from the maximum mixing ratio to 0 within the fade in time set by.

At the time when it is confirmed by the detecting means that the decoding of the first frame data or the field data of the selected file is completed, the fade in control means selects the data synthesizing means based on the time and the mixing rate condition set by the fade in condition setting means. By such a configuration in which the data mixing rate of the video data for fading with respect to the decoded video data is gradually reduced, it is possible to fade in and display an image of the selected file.

Another object of the present invention is to provide an image display system for selecting one of a plurality of files recorded as encoded video data, reading the video data from the selected file, decoding, reading, and displaying the read encoded data. An image switching device for use, comprising: data generating means for generating fade video data, closed-out condition setting means for setting a fade out time and a maximum mixing ratio of the fade video data to the decoded video data; Data synthesizing means for synthesizing the decoded video data with the fade video data from the data generating means while changing the mixing ratio of the fade video data to the decoded video data, and in response to the selection command, The data synthesis number A fade out control means for controlling the data synthesizing means so as to gradually increase the data mixing rate from 0 to a maximum mixing rate within the fade out time set by the fade out condition setting means, and a fade in condition setting means for setting the fade in time. Detecting means for determining whether or not decoding of the first frame data or field data of the encoded video data of the file selected according to the selection command has been completed; and when the completion of the decoding is detected by the detecting means, A fade in control means for controlling the data combining means to gradually reduce the data mixing rate of the combining means from the maximum mixing rate controlled by the fade out control means to zero within the fade in time set by the fade in condition setting means. Characterized by To provide an image switching apparatus.

In this structure, the maximum blending rate of the decoded video data for fade performed in the fade-out process for the image of the previous file is automatically used, and the next image is faded in from the maximum blending rate within the fade in time set in the fade in condition setting means. It is possible to display the next image. That is, it is possible to continuously perform the fade out process of the image of the previous file and the fade in process of the image of the next file while setting each processing time arbitrarily, and the state (fade state) of the image at the end of the fade out process is performed. It is possible to make the same as at the start of the fade in process.

A first embodiment of an image switching device according to the present invention will be described in detail with reference to the drawings. 1 is a system circuit diagram of a video / audio playback system using a video CD. In Fig. 1, reference numerals 1 and 2 denote monitors having a player, an indicator, an audio reproduction circuit, and a loudspeaker. The basic operation of the player 1 and its units will be briefly described.

Video data and related audio data which are encoded according to the MPEG 1 system and differ from file to file are recorded on the video CD 11. That is, the video data is based on the frame structure of the MPEG system, an I (internally coded) picture to which encoding is performed in a frame, a P (predictive coded) picture that performs prediction from a previous frame, a previous frame and a next frame. A time base composed of B (bidirectional predictive coded) images that perform prediction from frames and having 24 to 30 frames [I, B, B, P, B, B, ..., P, B, B, P] Configure GOP (picture group) in prediction mode. Each picture includes separately encoded luminance data and color data.

The audio data was encoded according to a suitable bit allocation processing system (MPEG 1; first layer) using sub-band encoding processing and auditory characteristics.

The encoded video data and audio data recorded on the video CD 11 are read by the optical pickup 12, and the obtained signal is amplified by the RF amplifier 13 and then input to the CD decoder / servo control circuit 14. .

The CD decoder / servo control circuit 14 decodes the EFM (modulations 8 to 14) signals obtained from the RF amplifier 13 and reads the sub code data. The CD decoder / servo control circuit 14 also outputs to the servo circuit 15 a control signal relating to the axis rotation speed and the tracking focus of the optical pickup 12. The servo circuit 15 responds to the control signal to execute rotation control and focus control of the shaft motor 16 and the tracking motor 17.

The microcomputer circuit 18 stores the data read from the TOC (list table) of the video CD 11 in its internal memory, takes subcode data and inputs it from the operation unit 19 via the input I / F 20. The CD decoder / servo control circuit 14 is controlled in accordance with the control command, and status information and the like are output through the driver 21, and the information and the like are displayed on the display portion 22.

The microcomputer circuit 23 transfers the mode information and obtains the data bus b2 for obtaining status information indicating the program processing status in the video CD decoder 24, the exchange of data address information, and the control of the video CD decoder 24. A data bus b3 for transmitting a signal for transmitting a signal, a data bus b4 for obtaining data stream information input to the video CD decoder 24, and a data bus for obtaining audio status information from the video CD decoder 24 ( via b5), it is connected to a video CD decoder 24. The microcomputer circuit 23 is also connected to the microcomputer circuit 18 via a data bus b0 that receives control commands and transmits status information. With the above configuration, the microcomputer circuit 23 controls all the systems including the video CD decoder 24.

The video CD decoder 24 includes a RISK (arranged instruction setting computer) processor 31, a host bus I / F 32, a video data decoder 33, an audio data decoder 34, and a DRAM (dynamic random memory) controller. 35, VD (video display) processor 36. They are all interconnected via buses.

The RISC processor 31 is connected to control the internal devices 32 to 36 and, in the decoding operation, reads a basic program stored in an external ROM (read only memory) 37 to decode MPEG1 syntax and two-dimensional DCT ( Arithmetic operations such as discrete cosine transform), inverse quantization, and motion vectors.

The host bus I / F 32 obtains the encoded video data and the encoded audio data of the video CD 11 from the CD decoder / servo control circuit 14 via the bus b1, and obtains the microcomputer 23 and the buses 2 through. 5) Exchange various information through

The DRAM controller 35 records the encoded video data and the encoded audio data obtained through the bus b1 to the external DRAM 38, and outputs the decoded video data to the VD processor 36 by the video data decoder 33. . The DRAM controller 35 also reads the encoded audio data in the DRAM 38 and outputs it to the audio data decoder 34. In addition, the DRAM 38 includes a buffer area for storing each picture (I picture, B picture, P picture), an audio data storage area, a late buffer area, and a RISC processor 31. Has the operating area used.

The video data decoder 33 decodes the variable-length coded data of each picture recorded in the DRAM 38 and decodes the luminance data and the color data of each picture in combination with the function of the RISK processor 31.

The audio data decoder 34 is combined with the RISK processor 31 to decode the encoded audio data recorded in the DRAM 38.

The VD processor 36 organizes the decoded video data as a data set, outputs the data set to the bus b1 ', and outputs a control signal to the bus b6. The VD processor 36 includes a fade out / fade in processing circuit which will be described later.

The video signal processing circuit 39 receives the decoded video data from the VD processor 36 via the bus bl 'and the D / A converter 40, receives the control signal via the bus b6, and receives the RGB signal. And a luminance signal and a color signal are converted into a composite signal, and the composite signal is sent to the NTC / PAL encoder 41.

The NTSC / PAL encoder 41 converts a composite signal into a video signal of an NTSC system or a PAL system, and outputs the video signal to the monitor device 2.

On the other hand, in the audio system, the audio signal processing circuit 43 receives the decoded audio data from the bus 7 via the D / A converter by the audio decoder 34 of the video CD decoder 24, and in a predetermined manner. It processes and outputs to the monitor apparatus 2. In addition, the bus b8 is used to transmit status information of the audio signal processing circuit 43 to the audio decoder 34 and the CD decoder / servo control circuit 14.

In the above-described video / audio playback system, this embodiment is characterized in the following points.

(1) A fade out / fade in processing circuit is provided in the data output portion of the VD processor 36 in the video CD decoder 24.

Specifically, the fade out / fade in processing circuit includes a multiplier 51 for multiplying the decoded video data by a variable controlled multiplication factor (1-km), and a data output circuit 52 for outputting lyrics display data. And a multiplier 53 for multiplying the output data of the data output circuit 52 by a variable controlled multiplication factor (km), and a data synthesizer 54 for synthesizing the outputs of the multipliers 51 and 53. The output of the data synthesizer 54 is supplied to the D / A converter 40 via the bus b1 '.

(2) The fade out / fade in processing condition can be set by specifying the parameter input mode in the operation unit 19.

(3) The fade out / fade in processing condition is stored in the micro computer circuit 23 via the micro computer circuit 18. The microcomputer circuit 23 supplies the processing condition to the video CD decoder 24 at a predetermined timing, and the VD processor 36 controls the fade out / fade in processing circuit based on the processing condition.

The fade out / fade in processing operation, which is one of the features of the present embodiment, will now be described with reference to the flowcharts shown in Figs.

Fig. 2 is a flowchart showing an operation for setting fade out / fade in processing conditions.

When the parameter input mode is set by the operation unit 19 of the player 1, the microcomputer circuit 18 notifies the parameter input mode to the microcomputer circuit 23, and the microcomputer circuit 23 enters the parameter setting mode (S1).

In this mode, when the fade out / fade in processing condition is input from the operation unit 19, the input condition is transferred from the micro computer circuit 18 to the micro computer circuit 23, so that the inside of the micro computer circuit 23 is carried out. It is stored in the memory (S2-S4).

In this embodiment, the mixing ratios 0-4 and the gradient 0-3 shown in Tables 1 and 2 are prepared as the fade out / fade in processing conditions.

TABLE 1

TABLE 2

"Mixing rate: 0-4" is the maximum mixing rate of the display data with respect to each color data of each frame in the case of mixing the color data of each image of the decoded video data and the release display data as shown in Table 1. &Quot; Inclination: 0-3 " is an index indicating the frame number within a related time at which the fade in / fade out process is completed.

For example, by entering fade out (mix rate: 3, slope: 1) / fade in (mix rate: 0, slope: 2), the "fade out process control can be clicked within the time associated with 15 fields from the start of the fade out process. The maximum mixing ratio of the swap display data is gradually increased from 0 to 3/4, and the fade-in processing control is performed until the maximum mixing ratio of the reduction display data is 3/4 to 0 within the time related to 30 fields from the start of the fade-in processing. Is executed to decrease gradually. "

Also, in the present embodiment, for the sake of simplification of the input command and the sequence, the fade process and the operation command of the next file are combined, and control items related only to the inclination, for example, the fade in operation (tilt: 1, slope: 2) It is possible to set the processing only.

In such a case, " Fade out processing control is executed under the conditions of the maximum mixing ratio of the display data set for the mixing ratio: 4 and the time condition of the slope: 1, and the fade in processing control is inclined at the start of the operation of the next file: Is executed under a time condition of 2 ".

In addition, in this embodiment, the color of the release display data can be set from the operation unit 19. If there is no color set, the trix is displayed in black. If any color is set, it is displayed in the set color.

3 and 4 show flowcharts of the operation of the video / audio reproduction system of this embodiment when the fade out / fade in process is actually executed.

In this case, the fade out / fade in processing condition is temporarily set to fade in operation (tilt: 1, slope: 2), while the player 1 plays the file Fp of the video CD 11, It is assumed that a search mode for setting a file is instructed from the operation unit 19.

First, when the search key of the operation unit 19 for setting a file (Fs) is turned on, the microcomputer circuit 23 issues the above-described fade in operation (inclination: 1, inclination: 2) command to the video CD decoder. Issued to (24), the video CD encoder 24 stores the command in the operating area of the DRAM 38 (S11-S13).

The video CD encoder 24 uses the VD based on the time information of fade out / fade in (M = 15 fields / N = 30 fields) set by the maximum mixing ratio (4/4) of the previously mentioned command and the relic display data. Km (i) [i = 1-M / 2] and km (j) [j = 1-N / 2 which determine the multiplication factor (1-km) and km of multipliers 51 and 53 of processor 36. Arithmetic operation is performed on the time series control data, and the control data is stored in the operation area of the DRAM 38 (S14). Where i is the frame number after the start of the fade out process and j is the frame number after the start of the fade in process.

When the storage of the control data in the DRAM 38 is completed, execution of the fade out process of the image data of the file Fp being reproduced starts with the initial value of km (i) set to km (0) = 0, and the data By operating the output circuit 52, the relix display data is output (S16).

The microcomputer circuit 18 checks the state information (setting condition of the fade out process) of the video CD decoder 24 through the data buses b2 and b5 and the micro computer circuit 23, and then starts the fade out process. The control data for reading the GOP constituting the encoded image data related to M / 2 from the file Fp is sent to the CD decoder / servo control circuit 14.

The encoded image data is read out serially from the file Fp during reproduction. Each picture of the MPEG system is recorded in the corresponding frame buffer of the DRAM 38, decoded by the video decoder 33, and output to the VD processor 36. Since the luminance data and the color data of each scholar are separated after decoding, and constitute decoded image data corresponding to one frame, fade out processing is performed by controlling the fade out / fade in processing circuit of the VD processor 36 in the following manner. Is executed.

First, in accordance with the decoded luminance data of the input image, the VD processor 36 sets the multiplication coefficient (1-km) of the multipliers 51 and 53 and the km (i) value that determines the km value as 0, and decodes it. Luminance data are output as in (S16 → S17, S22, S23 → S17).

Further, in accordance with the decoded color data of the image, the VD processor 36 immediately sets the km value to a value corresponding to the frame number i after the start of the fade out process based on the control data set in step S14. That is, in this case, the operation is the same as when the fade out (mixing ratio: 4, slope: 1) is set and km (i) is set to (1/8) i.

Therefore, the multiplication factor [1-km (i)] of the multiplier 51 is [(8-i) / 8], and the multiplication factor [km (i)] of the multiplier 51 is [i / 8]. do. Therefore, the decoded color data of the first frame (i = 0) after the start of the fade-out process is output from the data synthesizer 54 as it is, and the decoded color data of the i-th frame is separated from the relic display data at a rate of [i / 8]. The mixture is output to the data synthesizer 54 (S20).

When output of the color data is completed, the decoded luminance data of the next image is input to the VD processor 36. Therefore, decoded luminance data in which m (i) is temporarily zero and m (i) is zero is output as it is (S21, S22-S24-> S17). Further, in the step in which the decoded color data is input to the VD processor 36, km (i + 1) is determined based on the control data, and the relix display data is a data synthesizer at a ratio of [(i + 1) / 8]. In 54, the data is mixed with the decoded color data (S18-S21).

As a result, by repeating the above steps, the decoded luminance data of each image is output as it is, and the relix display data is after the start of the fade out process at the ratio of 0, 1/8 2/8, 3/8, ... It is mixed with the decoded color data of the frames. That is, the image of the file Fp displayed on the monitor device 2 via the video signal processing circuit 39 and the NTSC / PAL coder gradually fades by the color of the display data.

The fade out process is terminated in a step in which the number of frames becomes M / 2 (in this case, 8 (≥15 / 2) frames) based on the setting condition of the slope: 1. At this step, the reproduction of the file Fp is also terminated (S23? S25).

In this step, the mixing ratio of the relax display data to the decoded color data is 1 (= 4/4), and the display screen of the monitor 2 completely fades by the color of the relax display data.

When the fade out process is completed through the above-described steps, the microcomputer circuit 23 sends status information received from the video CD decoder 24 to the microcomputer circuit 18 to start reading the file Fs. Order. The microcomputer circuit 18 notifies the CD decoder / servo control circuit 14 of the above command, and reading of the file Fs from the video CD 11 starts (S30).

The encoded video data and the encoded audio data of the file Fp thus read are transferred to the video CD decoder 24, recorded in the DRAM 38, and decoded by the respective decoders 33 and 34. The decoding of the first frame (I picture) is completed and the TLF row of the fade in process is started (S31-S33).

In this step, km (0) = O is set to the initial value of the coefficient km (j), and the VD processor 36 outputs the decoded luminance data of the first frame as it is (S33, S34).

Then, when the decoded color data of the first frame is read from the DRAM 38 to the VD processor 36, km (0) is switched to 1 by the control data based on the fade out setting condition.

Therefore, since the multiplication coefficients [1-km (0)] and [km (0)] are set to 0 and 1, respectively, the decoded color data output from the data synthesizer 54 includes only the lease display data. Since this state is similar at the same time as the fade out process is completed, the display screen of the monitor 2 associated with the frame is completely maintained in the color of the release display data (S35-S38).

On the other hand, when the output of the data of the first frame is completed, km (0) is immediately switched to zero, and the decoded video data of the second frame is input to the VD processor 36. The fade out / fade in process control for the second frame and subsequent frames is executed in the following manner.

First, km (j-1) is switched to 0 at the same time as the data output of the frame j-1 is completed, and the decoded luminance data of the frame j is output as it is (S39-S41? S34). ).

Then, when the decoded color data is inputted, km (j) is immediately set to a value corresponding to the number j of the frame after the fade in process starts, based on the control data set in step 14 shown in FIG. . That is, in this case, since the condition setting is similar to the case of fade in (mixing rate: 4, slope: 2), the following setting is made: km (j) = 1- (1/15) -j = (15-j ) / 15.

Therefore, the multiplication coefficients [1-km (j)] and [km (j)] of the multipliers 51 and 53 become [(1/15) -j] and [(15-j) / 15], respectively. The decoded color data of the first frame (j = 0) after the start of the fade out process is output from the data synthesizer 54 as it is, and the decoded color data of the next j-th frame is in the ratio [(15-j) / 15]. It is mixed with the elixis display data and output from the data synthesizer 54 (S36).

By repeating steps 34 to 41, the drum arc luminance data of each frame is output as it is, and relicted at a ratio of 14/15, 13/15, 12/15, ... in the order of the frames after the start of the fade in process. This is mixed with the display data. Since the blending rate gradually decreases, the image on the screen of the monitor 2 displayed via the video signal processing circuit 39 and the NTSC / PAL encoder 41 is a monotone of the complete Lyrics display data color and gradually becomes a file Fp. Is a reproduced image of the decoded data.

The fade in process is terminated in a step in which the frame number j becomes N / 2 (15 frames in this case) on the basis of the setting condition of the slope: 2, and the output of the lease display data is also performed in this step (S40? Terminated at S42).

In this step, the mixing ratio of the delix display data with the decoded color data became 0 (= 0/4) and the entire reproduced image of the file Fp is displayed on the display screen of the monitor 2.

The fade out / fade in process is terminated through the steps shown in Figs. Fig. 5 shows the relationship between the time serial processing step and the data streams of the files Fp and Fs.

That is, as shown in Fig. 5, when the search key of the operation unit 19 is operated, the fade out process associated with the image of the file Fp is executed under the condition of inclination: 1. The operation of the file Fp terminates with completion of the fade out process. Thereafter, the operation of the file Fp starts, and the fade in process is executed under the condition of gradient: 2 from when the decoding of the first frame is completed and the fade out / fade in process is completed.

6 shows the relationship between the time serial processing step and the image state on the monitor 2. FIG. In addition, uppercase letters A and B in Fig. 6 respectively display pictures of decoded video data of files Fp and Fs.

As shown in Fig. 6, by performing the fade out / fade in process, the image A gradually fades out by the color of the relix display data and the screen becomes the color of the relix display data completely temporarily [(a) -(d)]. At that time, the image B is faded in on the screen of the release display data color to display the entire image B [(d)-(g)]. Thus, in comparison with the conventional switching system in which picture A is suddenly switched to picture B, a very natural switching from picture A to picture B can be realized.

On the other hand, the encoded audio data is sequentially decoded by the audio decoder 34 of the video CD decoder 24 at a timing corresponding to the decoding of the encoded video data. Decoded audio data is supplied to the audio signal processing circuit 43 via the D / A converter 42, and the resulting audio signals R and L are output from the audio signal processing circuit 43 to the monitor 2. . In addition, the monitor 2 reproduces a sound corresponding to an image reproduced in time series.

This embodiment has been described by employing the implementation as an example of the compound instruction fade in operation (incline: 1, slope: 2). If the fade out condition and fade in condition are respectively set, km is controlled based on these conditions.

In this embodiment, the fade out / fade in processing circuit of the VD processor 36 has the structure shown in Fig. 1, and in order to output the decoded luminance data as it is, km is the step S22 shown in Fig. 3 and Fig. Through step S39 shown in 4, the operation is switched to zero for each frame. On the other hand, a switching means such as a multiplexer on the input side of the multiplier 51 may be provided to output decoded luminance data as it is to the output side of the data synthesizer 54 and input only the decoded color data to the multiplier 51. In such a case, although the switching means must be controlled, the km can only be increased / decreased controlled according to the setting of the fade out / fade in process.

Further, in the present embodiment, the fade out process is executed from the operation unit 19 based on the selection command of the next file Fs. On the other hand, it is possible to input a file number or the like to be reproduced and displayed next to the end of the data stream of each file. When the sequence of reproduction and display of the file is determined according to the file number, fade out processing for any file is performed at the same time as the file number is detected.

In this embodiment, although the fade out / fade in condition setting is selected according to any setting condition shown in Tables 1 and 2, it is possible to constitute a system in which these conditions can be set by the operation unit 19. .

Now, a second embodiment of the image switching device according to the present invention will be described. The image switching device according to the second embodiment can be used in the video / audio reproduction system shown in Fig. 1 as in the first embodiment. Although only the decoded color data fade out / fade in in the first embodiment, the fade out / fade in process is performed for both decoded luminance data and decoded color data in the second embodiment.

Fig. 7 shows a flowchart of the fade out process of the image switching device according to the second embodiment. In the second embodiment, the fade out / fade in processing circuit of the VD processor 36 is executed by the following control procedure, wherein steps S11 to S16 and steps S23 to S25 are as shown in Fig. 3, and thus the detailed description thereof is performed. Description is omitted.

First, the VD processor 36 responds to the decoded data of the image so as to immediately set km (i) to a value corresponding to the number (i) of the frame after the fade-out process is started, based on the control data set in step S14. (S19). That is, in this case, since it is a case similar to the condition where the condition is set to fade out (mixing ratio: 4, gradient: 1), km (i) = (1/8) i is set.

Therefore, the multiplication coefficients [1-km (i)] and [km (i)] of the multipliers 51 and 53 become [(8-i) / 8] and [i / 8], respectively. As a result, the decoded luminance data and decoded color data of the first frame (i = 0) after the start of the fade out process are output as is from the data synthesizer 54 as it is. For the next frames, the decoded color data of the i-th frame is mixed with the rex color data at a ratio of 8 and output to the data synthesizer 54 (S50). When output of the luminance data is completed (S51), the decoded color data mixed with the rex color data at a ratio of [i / 8] is output from the data synthesizer 54 (S20, S21).

As a result, the decoded luminance data and the decoded color data are repeated at a mixing ratio of 0, 1/8, 2/8, 3/8, ... in the order of the frames after the start of the fade out process by repeating the above-described procedures, respectively. It is mixed with display luminance data and color data. That is, the screen of the monitor 2, in which the image of the file Fp is displayed on the monitor device 2 via the video signal processing circuit 39 and the NTSC / PAL encoder 41, is designated by the display data of the lease. It gradually changes to a forged color screen with luminance of.

8 shows a flowchart of a fade in process of the image switching device according to the second embodiment. In the second embodiment, the fade out / fade in processing circuit of the VD processor 36 executes the fade in process by the following control procedure, wherein the processes of steps S30 to S32 and S40 to S42 are shown in FIG. As it is the same as, the description thereof is omitted.

Simultaneously with decoding of the first frame (I picture), the initial value of km (j) is set to km (0) = 1 (S60). Therefore, since the multiplication coefficients [1-km (0)] and [km (0)] of the multipliers 51 and 52 become 0 and 1, respectively, the decoded video data output from the data synthesizer 54 is only the relix data. Includes only. Since this state is similar to when the fade out process is completed, the color and luminance of the display screen of the monitor 2 in relation to the frame are the color and luminance of the lease display data.

In the second frame and subsequent frames, the fade out / fade in processing circuit is controlled as described below. First, when decoded data is inputted, km (j) is immediately set to a value corresponding to the number j of the frame after the fade in process starts based on the control data set in step 14 shown in FIG. That is, in this case, the condition is similar to when the fade in (mixing ratio: 4, slope: 2) is set, so the following setting is made: km (j) = 1- (1/15) -j = (15- j) / 15.

Therefore, the multiplication coefficients [1-km (j)] and [km (j)] of the multipliers 51 and 53 become [(1/15) -j] and [(15-j) / 15], respectively. The decoded luminance data and decoded color data of the first frame (j = 0) after the start of the fade out process are output as is from the data synthesizer 54, while the decoded luminance data and decoded color data of the subsequent j-th frame are [(15 -j) / 15] is mixed with the luminance data and the color data of the release display data and output from the data synthesizer 54 (S62, S63, S37, S38).

By repeating the above-described procedure, the decoded luminance data and the decoded color data of each frame are displayed in the ratio of the Felix display data at the ratio of 14/15, 13/15, 12/15, ... in the frame order after the start of the fade in process. It is mixed with luminance data and color data. Since the mixing rate of the elixis display data is gradually increased, the image on the screen of the monitor 2 that is displayed through the video signal processing circuit 39 and the NTSC / PAL encoder 41 and has the luminance and color of the elixis display data is a file. It gradually changes to the reproduced image of the decoded data of (Fs).

Although the lease display data as video data for fade has been described as a monotonous image having a predetermined brightness and color in the first and second embodiments, the released display data is not limited to such video data but is prescribed. As long as the picture can be displayed together it can be another video data.

The image switching device of the present invention has the following effects.

First, regardless of the timing of the image switching selection command, the fade out control means gradually increases the data mixing rate of the video data for fading with respect to the decoded video data based on the conditions of the time and the mixing rate set by the fade out condition setting means. With the configuration of controlling the data synthesizing means to make it possible, the image currently being played can be faded out and terminated. In addition, it is possible to fix one of the conditions set by the fade out condition setting means and set another condition arbitrarily.

Further, at the time when it is confirmed by the detecting means that the decoding of the first frame data or the field data of the selected file is completed, the fade in control means synthesizes the data based on the conditions of the time and the mixing rate set by the fade in condition setting means. By means of controlling the means to gradually reduce the data mixing rate of the fading video data with respect to the decoded video data, it is possible to fade in and display an image of the selected file.

Also, the maximum blending rate of the decoded video data for fade performed in the fade-out process for the image of the previous file is automatically used, and the next image is faded in from the maximum blending rate within the fade in time set in the fade in condition setting means. It is possible to display the next image. That is, it is possible to continuously perform the fade out process of the image of the previous file and the fade in process of the image of the next file while setting each processing time arbitrarily, and the state (fade state) of the image at the end of the fade out process is performed. It is possible to make the same as at the start of the fade in process.

Claims (3)

(Correction) is used in an image display system for selecting one of a plurality of files recorded as encoded video data, reading the video data from the selected file, decoding the read encoded data, and reproducing and displaying the same. An image switching device for switching an image of a file currently being displayed to an image of the selected file according to a selection command from or a control command included in a data stream of video data, the data generating device generating fading video data. Means for setting a fade out time and a maximum mixing rate of the fade video data with respect to the decoded video data (fade out condition setting means and changing the mixing rate of the fade video data with respect to the decoded video data). While the decrypted Data synthesizing means for synthesizing video data and video data for fading from the data generating means, and in response to the selection command, the data mixing ratio of the data synthesizing means is set to zero within the fade out time set by the fade out condition setting means. And fade-out control means for controlling said data synthesizing means to gradually increase from. (Correction) is used in an image display system for selecting one of a plurality of files recorded as encoded video data, reading the video data from the selected file, decoding the read encoded data, and reproducing and displaying the same. An image switching device for switching an image of a file currently being displayed to an image of the selected file according to a selection command from or a control command included in a data stream of video data, the data generating device generating fading video data. Means for setting fade in time and a maximum mixing rate of the fade video data with respect to the decoded video data, and changing the mixing rate of the fade video data with respect to the decoded video data. The decrypted video Data synthesizing means for synthesizing the false data and the video data for fading from the data generating means, and detecting means for determining whether or not decoding of the first frame data or field data of the encoded video data of the file selected according to the selection instruction is completed; And when the completion of the decoding is detected by the detecting means, the data combining rate is gradually reduced from the maximum mixing rate to zero within the fade in time set by the fade in condition setting means. And a fade in control means for controlling the means. (Correction) is used in an image display system for selecting one of a plurality of files recorded as encoded video data, reading the video data from the selected file, decoding the read encoded data, and reproducing and displaying the same. An image switching device for switching an image of a file currently being displayed to an image of the selected file according to a selection command from or a control command included in a data stream of video data, the data generating device generating fading video data. Means for setting a fade out condition and a maximum mixing rate of the fade video data with respect to the decoded video data, and changing the mixing rate of the fade video data with respect to the decoded video data. The decrypted Data synthesizing means for synthesizing the video data and the video data for fading from the data generating means, and in response to the selection command, the data mixing ratio of the data synthesizing means is zero within the fade out time set by the fade out condition setting means. A fade out control means for controlling the data synthesizing means to gradually increase from? To a maximum mixing ratio, a fade in condition setting means for setting a fade in time, first frame data of encoded video data of a file selected according to the selection command, or Detection means for determining whether or not decoding of field data has been completed, and a fade in time in which the fade in condition setting means sets the data mixing rate of the data synthesizing means when the completion of the decoding is detected by the detection means. The fade within So as to gradually decrease from the maximum mixing rate is controlled by the control unit to 0 the image switching apparatus including a fade-in Spain control means for controlling said data synthesizing means.

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