JPH11313287A - Moving image data compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the moving image data compressor that facilitates edit of non-real time data and widens the width of edit. SOLUTION: Modules 311, 312,... corresponding to 'processing 1', 'processing 2',... are stored in a storage device 17. In the case that an icon 301 or 302 or the like corresponding to a desired processing is clicked or a name of processing is entered by a keyboard, the storage device 17 sends the module 311 or 312 or the like corresponding to the selected processing (rewinding or de-framing or the like) to a video signal processing section 15. The video signal processing section 15 stores the module sent from the storage device 17 and applies processing corresponding to the module to non-real time data received from a video file 7 and gives the resulting data to a compressor. Thus, desired processing is easily applied to the non-real time data without applying re- connection or the like to an edit device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image data compression apparatus for compressing moving image data read from a recording medium on which moving image data is recorded, and more particularly, to a method for reading moving image data irrespective of the passage of time. The present invention relates to a moving image data compression apparatus capable of compressing moving image data read from a recorded non-real time recording medium.

[0002]

2. Description of the Related Art In recent years, with the diversification of communication devices, there has been proposed a technique of compressing moving image data, reducing the amount of data, and using the data for communication or the like. As a method of compressing the moving image data, for example, MPEG (Moving Picture Im)
Age Coding Experts Group) is known.

On the other hand, as a recording medium for recording moving image data, in addition to a conventionally used video tape, laser disk, and the like, recently, a hard disk, a video file (for example, an ITU-R656 format video file) and the like have been used. It is also contemplated to be used. Video tapes and laser disks are so-called real-time recording media in which moving image data is recorded so that they can be read sequentially over time.
This is a so-called non-real-time recording medium on which moving image data is recorded so as to be read regardless of the passage of time. It is also conceivable to convert moving image data read from a non-real-time recording medium (hereinafter also referred to as non-real-time data) into moving image data recordable on a real-time recording medium (hereinafter also referred to as real-time data). ing.

[0004]

However, the conventional moving picture data compression apparatus can only compress moving picture data read from a real-time recording medium. For this reason, conventionally, after converting non-real-time data into real-time data, the data is temporarily recorded on a real-time recording medium such as a video tape, and the recorded real-time data is reproduced by a player or the like. Compression by a data compression device was possible. Therefore, conventionally, when performing various processes such as noise removal and gamma correction on non-real-time data for editing, the following complicated work has been required. That is, first, the non-real-time data is converted and recorded on the real-time recording medium as described above, and an editing device corresponding to the processing to be performed is connected to the moving image data compression device. Was entered.

[0005] For this reason, editing the non-real-time data requires the above-mentioned complicated work, and it is necessary to individually prepare an editing device corresponding to the processing. Further, since editing is performed after converting non-real-time data into real-time data, it is extremely difficult to perform processing such as frame dropping and rewinding, as with general real-time data.

Further, relatively simple editing such as brightness adjustment, gamma correction, fade-in and fade-out can be performed without converting non-real-time data to real-time data. Also in this case, it is necessary to individually prepare an editing device corresponding to the processing. For this reason, editing of non-real-time data still required complicated work.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a moving picture data compression apparatus which can easily edit non-real time data and expand the range of editing.

[0008]

According to the first aspect of the present invention, there is provided a moving image data compression apparatus for compressing moving image data read from a recording medium on which moving image data is recorded. Reading control means for controlling the operation of the non-real-time reading means for reading the moving image data from a non-real-time recording medium on which the moving image data is readable regardless of the passage of time; There are at least two types of compression means for compressing the moving image data read by the time reading means, and moving image data read by the non-real time reading means, or the operation of the non-real time reading means controlled by the reading control means. Processing means capable of performing the above processing;
Selecting means for selecting the moving image data or the processing to be performed on the operation by the processing means.

According to the present invention, the reading control means controls the operation of the non-real-time reading means for reading moving image data (non-real-time data) from the non-real-time recording medium, and the compression means controls the operation of the non-real-time reading means. Compress non-real-time data.
Further, the processing means includes the read non-real time data,
Alternatively, the operation of the non-real time reading means includes at least two
More than one kind of processing can be performed, and the selection means selects the processing performed by the processing means on the moving image data or the operation. Therefore, in the present invention, a desired process can be directly applied to the non-real-time data, and a desired process can be selected from a plurality of types of processes without performing reconnection of the apparatus. be able to. Therefore, in the present invention,
Editing of non-real time data can be easily performed.

[0010] In addition, non-real time data can be easily subjected to extremely various processes including frame dropping and rewinding by a simple conversion process using software or the like. This is the same when processing is performed on the operation of the non-real-time reading unit. Further, when the non-real-time data or the operation is processed by a conversion process by software or the like, only a desired process from a plurality of processes can be performed very easily by replacing software. Therefore, according to the present invention, various processes can be performed as desired without complicating the configuration of the device, and the range of editing non-real-time data can be favorably expanded.

The conventional moving picture data compression apparatus compresses moving picture data (real time data) in synchronization with a synchronization signal generated at a constant interval, which is one of the reasons that non-real time data cannot be directly compressed. Was one. Therefore, the present invention further comprises a second synchronizing signal generating means for generating a synchronizing signal based on the moving image data read by the non-real-time reading means, and responding to the synchronizing signal generated by the second synchronizing signal generating means. If the compression means performs the compression, non-real-time data can be compressed more accurately and reliably.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the time required for the processing means to perform the selected processing is longer than the time required for the compression operation of the compression means. And a delay unit for delaying the compression operation of the compression unit.

In the present invention, when the time required for the processing means to perform the selected processing is longer than the time required for the compression operation of the compression means, the delay means delays the compression operation of the compression means. Therefore, even when it takes a relatively long time for the processing means to perform the selected processing, the compression operation by the compression means can be executed accurately and reliably.

That is, most compression means perform compression using the difference between the preceding and following moving picture data. For example, in this case, if the operation of the compression means is too fast compared to the input interval of the moving picture data, Extra data changes,
An error may occur because new moving image data for detecting the difference is not input. On the other hand, according to the present invention, the compression operation of the compression means can be delayed, so that the compression operation can be executed accurately and reliably. Therefore, if the processing performed by the processing unit is a relatively heavy process, for example, a process performed by software, an accurate and reliable compression operation can be performed even if a process having a relatively large number of steps is selected.
Therefore, according to the present invention, in addition to the effect of the first aspect of the invention, there is an effect that the range of editing non-real time data can be further expanded.

The third aspect of the present invention provides the first or second aspect.
In addition to the configuration described above, the processing means performs the selected processing on the moving image data before the compression operation by the compression means. When processing is performed on the non-real-time data before being compressed by the compression means, the processing is directly performed on the original non-real-time data, so that extremely various processing can be performed. Therefore, according to the present invention, in addition to the effects of the first and second aspects of the present invention, there is an effect that the range of editing non-real time data can be further expanded.

According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the processing means converts the selected processing to the moving image data after the compression operation by the compression means. It is characterized by being applied. When processing non-real-time data (for example, data of variable length code) after being compressed by the compression means, the amount of data is reduced by compression, so that processing can be performed quickly by simple processing. it can. Therefore, in the present invention, claim 1
In addition to the effects of the invention described in any one of (1) to (3), there is an effect that the processing speed relating to editing of non-real time data can be further improved. Further, since the data amount is reduced, the memory capacity and the like of the device can be reduced, and the effect that the manufacturing cost can be further reduced can be obtained.

According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, when the moving image data includes instruction data for instructing processing to be performed by the processing means, The selection means switches the processing to be selected at any time based on the instruction data.

In the present invention, when the instruction data for instructing the processing to be performed by the processing means is included in the non-real-time data, the selecting means switches the selected processing at any time based on the instruction data. Therefore, only by adding the instruction data to the non-real-time data, the non-real-time data can be automatically edited. Therefore, in addition to the effect of the invention described in any one of claims 1 to 4, there is an effect that editing of non-real time data can be performed more easily.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing a configuration of a moving image data compression device 1 to which the present invention is applied. As shown in FIG. 1, the moving image data compression apparatus 1 includes various instructions (for example, a real-time / non-real-time switching interrupt, a compression start instruction interrupt, and a compression end instruction, which will be described later) input from a personal computer (personal computer) 3. This is a device that is controlled based on an instruction interrupt or the like and compresses moving image data read from a video tape 5 or a video file 7 (for example, an ITU-R656 format video file) and outputs it as a stream 8.

Real-time data (video signal in this case) read from a video tape 5 as a real-time recording medium
Is input to the synchronization signal generator 10 via the video signal processing unit 9, and the non-real-time data read from the video file 7 as a non-real-time recording medium is transmitted to the video signal processing unit 15.
Is input to the controller 20 via the. Video signal processing unit 9
Is a well-known editing mechanism that performs various processes such as noise removal and gamma correction on real-time data read from the video tape 5. The synchronizing signal generator 10 outputs the real-time data input from the video signal processing unit 9 as a real-time video signal together with the synchronizing signal. The real-time video signal is output to the switch 30 and the synchronizing signal is output to the switching device. 40 are respectively input.

On the other hand, the video signal processing unit 15 performs various conversion processes on non-real time data read from the video file 7 based on a program stored in a storage device 17 (FIG. 2) described later. In addition, the controller 20 generates a non-real-time video signal and a synchronization signal based on the non-real-time data input from the video signal processing unit 15 as described later. As in the case of real-time data, each signal generated by the controller 20 is input to the switch 30 for a non-real-time video signal and to the switch 40 for a synchronization signal.

Each video signal input to the switch 30 is input to the compressor 60 via the buffer 50,
Are input directly to the compressor 60. Then, the compressor 60 compresses the video signal according to the MPEG method described later based on the input, and outputs it as a stream 8. The switches 30 and 40 receive a real-time / non-real-time switching signal from the controller 20 and input the real-time video signal and the synchronization signal from the synchronization signal generator 10 or the controller 20. It switches which of the non-real-time video signal and the synchronization signal is input to the compressor 60. Further, the controller 20, the switching units 30, 4
0, the buffer 50, and the compressor 60, various signals are input and output in addition to the real-time / non-real-time switching signal. The details will be described later.

FIG. 2 is a block diagram showing the configuration of the controller 20. As shown in FIG. 2, the non-real-time data read from the video file 7 is subjected to various conversion processes by the video signal processing unit 15 based on a program described later stored in the storage device 17, and the video signal processing is performed. The non-real-time data input from the unit 15 to the controller 20 is input to the field end code separator 22 via the file data input switch 21. Further, the file data input switch 21 and the field end code separator 22 are provided with a CPU,
It is connected to a central processing unit 23 as a microcomputer having a ROM, a RAM, and the like, and inputs and outputs signals as follows.

First, the file data input switch 21
Switches whether or not non-real-time data can be input from the video signal processing unit 15 based on a file data input start instruction and a file data input stop instruction from the central processing unit 23. Field end code separator 22 separates non-real time data as follows. That is, a general video image is formed by alternately picking up two types of images called a top field and a bottom field in which the positions of scanning lines are different (a pair forms one frame). Therefore, as illustrated in FIG. 3, the file 200 of the non-real time data includes the top field 1
01 and the bottom field video data 203 for capturing the video of the bottom field 103 are alternately arranged, and the top of each video data 201 and 203 has Top field start code 2 indicating start of video data
05, a bottom field start code 207 is provided.

Therefore, the field end code separator 22 shown in FIG. 2 converts the non-real-time data input through the file data input switch 21 into the top field video data 201 and the bottom field video data 203.
(Hereinafter, also referred to as non-real-time video signals) and a top field start code 205 and a bottom field start code 207. The field end code separator 22 outputs the non-real-time video signal to the switch 30 and outputs the bottom field video data 2
When the head of the top field start code 205 or the bottom field start code 207 following the 03 or the top field video data 201 is detected, a field end code detection interrupt is output to the central processing unit 23.

The controller 20 also includes a central processing unit 2
3 is provided with a synchronizing signal generator 24 for generating a synchronizing signal and outputting it to the switch 40 when a synchronizing signal generation instruction is inputted from 3. In addition to the above signals, the central processing unit 23
A real-time / non-real-time switching interrupt, a compression start instruction interrupt, and a compression end instruction interrupt are input from the personal computer 3, and a one-field read end interrupt, which will be described later, is input from the compressor 60. A non-real time switching signal is output to switches 30 and 40.

Next, the configuration of the compressor 60 will be described with reference to FIG. As shown in FIG. 4, the compressor 60 is
A read controller 61 that outputs a read instruction to the buffer 50 in response to a synchronization signal or the like input from 0, and performs a subtraction process between a video signal read from the buffer 50 and reference data described later in response to the read instruction. A subtracter 62; a DCT transformer 63 as orthogonal transform means for performing DCT (discrete cosine transform) processing, which is a kind of orthogonal transform;
A quantizer 64 as quantization means for quantizing the DCT coefficient data output from the transformer 63;
4, a variable-length encoder 65 as variable-length encoding means for performing variable-length encoding on the DCT coefficient data quantized in DCT coefficient data, and the DCT quantized in the above-described quantizer 64.
An inverse quantizer 66 for inversely quantizing the coefficient data, and an inverse DCT (inverse discrete cosine transform) process for the inversely quantized DCT coefficient data by the inverse quantizer 66
A converter 67, an adder 68 for adding motion compensation to the data returned to the video signal before DCT processing by the inverse DCT converter 67, and an output from the adder 68 for motion compensation prediction 69, a motion compensator 71 that performs motion compensation prediction based on the data stored in the memory 69 and outputs it as reference data, and a compression controller 73 that controls the overall operation of the compressor 60. And

In the compressor 60, the video signal stored in the buffer 50 can be compressed as follows and output as a stream 8. First, the video signal (moving image data) to be compressed is temporarily stored in the buffer 50. The read controller 61 inputs a read instruction to the buffer 50 every time a synchronization signal is input from the switch 40, and causes the subtracter 62 to read the video signal stored in the buffer 50. The reference data (prediction value data) from the motion compensator 71 is also input to the subtractor 62, and the difference data (prediction error) between the video signal and the reference data is output to the DCT converter 63.

The DCT transformer 63 performs a DCT (discrete cosine transform) process on the difference data input from the subtractor 62. The calculation unit of this processing is performed in a predetermined block unit, and a number of coefficients (hereinafter, also referred to as DCT coefficients) corresponding to the block unit is calculated. The DCT transformer 63 arranges the coefficients in the order of frequency components and outputs the coefficients to the quantizer 64. In the quantizer 64, the DC input from the DCT converter 63 with a preset step size is used.
The T coefficient is quantized, and the quantized value is output to the variable length encoder 65. The variable-length encoder 65 determines a significant block, performs variable-length encoding on the quantized DCT coefficient, and outputs the result as a stream 8.

For the variable-length coding, for example, after the output of the quantizer 64 is run-length transformed,
It is conceivable that the coefficient is converted into a variable length code and output. The run-length transform results in two coefficients, which are the set of the number of zero coefficients and the value of the next non-zero coefficient. However, since the output of the quantizer 64 tends to continue with many zero coefficients, the run-length The data amount is reduced by the conversion. Next, 2 obtained as a result of the run-length transformation
Compressed data can be obtained by collecting the coefficients and allocating one variable-length code to output.

On the other hand, the inverse quantizer 66 includes a quantizer 64
Since the quantized DCT coefficient output from is input, inverse quantization is performed using the step size used in the quantizer 64, a DCT coefficient is calculated, and the calculated DCT coefficient is output to the inverse DCT transformer 67. Note that this DCT coefficient is a value including an error due to quantization. The inverse DCT transformer 67 performs an inverse DCT (inverse discrete cosine transform) process on the DCT coefficient, and outputs the result to the adder 68. This adder 68
The output from the inverse DCT converter 67 and the output from the motion compensator 71 are added and input to the memory 69.

The memory 69 is a frame memory for motion compensation prediction, and is composed of a frame memory for at least two frames. Then, at the same time as accumulating the data from the adder 68, the data of the previous frame for motion compensation prediction is output to the motion compensator 71. Motion compensator 7
In 1, a well-known motion compensation prediction using a motion vector or the like is performed on the data of the previous frame input from the memory 69, and the data is output to the subtractor 62 as prediction value data. This is a schematic operation related to data compression. As described above, by utilizing a difference between video signals (moving image data) and employing run-length transform and variable-length code, efficient data compression can be realized. it can.

In addition, at least in processing relating to the compression of non-real time data, the compression controller 73 sends the motion compensator 7 from the subtractor 62 when the compression operation for one field is completed.
The operation of each section of the compressor 60 up to 1 is temporarily stopped, and the state is held until the next synchronization signal is input to the read controller 61. Further, as described above, the read controller 61 inputs a read instruction to the buffer 50 every time a synchronization signal is input from the switch 40, and causes the subtracter 62 to read data stored in the buffer 50, Buffer 5
When all the data in 0 has been read into the subtractor 62, a one-field reading completion interrupt is input to the central processing unit 23 of the controller 20.

Next, control in the moving picture data compression apparatus 1 configured as described above will be described. 5 to 9
5 is a flowchart showing the processing executed by the central processing unit 23 of the controller 20, and FIG. 5 shows the main routine. The central processing unit 23 starts this processing when the power is turned on.

As shown in FIG. 5, when the central processing unit 23 starts processing, first, S1 (S represents a step:
In the following S2, the video input means is set to real time. Here, the image input means is constituted by a kind of flag stored in the central processing unit 23 according to the state of the switches 30 and 40. When the power is turned on, both the switches 30 and 40 are connected to the synchronous signal generator 10.
Side, that is, the side corresponding to the real time data, so that the video input means is in real time.

In S3 and S4, a real-time / non-real-time switching interrupt and a compression start instruction interrupt from the personal computer 3 are permitted, and in S5, it is determined whether or not there is any interrupt. If there is no interrupt (S5: N
O), the process stands by in S5, and if there is an interrupt (S5: YES), the process corresponding to the interrupt is executed in S6, and then the process proceeds to S5. That is, after the power is turned on, the central processing unit 23 executes the initialization processing of S1 to S4, and then waits until there is an interruption by the infinite loop of S5. If a predetermined end instruction is input as an interrupt during the execution of the infinite loop, the process ends. If a predetermined reset instruction is input as an interrupt, the process is restarted from S1.

FIG. 6 shows a real-time / non-real-time switching interrupt process executed when a real-time / non-real-time switching interrupt is input (S5: YES) as a process (S6) corresponding to the interrupt. ing. As shown in FIG. 6, when this process is started, first, the current state of the video input means is determined (S11), and if it is a real time, the process proceeds to S13. In S13, the video input means is set to non-real time,
At S15, the real-time / non-real-time switching signal is output from the switch 3
Output to 0,40. Then, both the switches 30 and 40 are set to the controller 20 side, that is, the side corresponding to the non-real time data. In S13, the video input means is set to non-real time in response.

If the video input means is non-real time, S
The process moves from S11 to S17. In S17, after the video input means is set to real time, the flow shifts to S15 described above, and the real time /
A non-real time switching signal is output to switches 30 and 40. Then, both the switches 30 and 40 are set to the synchronization signal generator 10 side, that is, the side corresponding to the real-time data. In S17, the video input means is set to real time in response. As described above, by inputting the real-time / non-real-time switching interrupt from the personal computer 3, the switches 30, 4 are switched.
By switching the state of 0, it is possible to switch whether to compress the real-time data or the non-real-time data.
When this routine ends after the process of S15 ends, the process returns to the infinite loop (S5) of FIG.

When a compression start instruction interrupt is input (S5: YES), a compression start instruction interrupt process corresponding to the interrupt is executed as S6, as shown in FIGS. As shown in FIG. 7, when the processing is started, first, in S21 and S23, the compression start instruction interrupt and the real time / non-real time switching interrupt are prohibited. In the following S25, a variable F for counting the number of fields as described later is used.
Is set to 1 and further in S27, the compression end instruction interrupt is permitted. Subsequently, the flow shifts to S29 to judge the current state of the video input means. If the video input means is in real time, the flow shifts to S31. In S31, it is determined whether or not the compression operation by the compressor 60 has been completed, and the process waits until the compression operation is completed. That is, as described above, the moving image data compression device 1 can compress the real-time data in substantially the same manner as the conventional moving image data compression device. For this reason, the controller 20 does not need to perform such control in compression. Therefore, in S31, the state of the compressor 60 is detected, and the process waits until the compression operation is completed. Further, when a compression end instruction interrupt is input from the personal computer 3 during the compression of the real time data, the compression operation of the compressor 60 may be forcibly terminated. However,
In this case, a predetermined termination process for smoothly terminating the compression operation is required.

When the compression processing is completed (S31: YE
S), and proceed to S32 to prohibit all interrupts. In subsequent S33 and S34, the compression start instruction interrupt and the real time / non-real time switching interrupt are permitted, and the process returns to the infinite loop (S5). That is, by executing the processing of S32 to S34, the state becomes the same as when the above-described infinite loop (S5) is entered immediately after the power is turned on.

On the other hand, if the video input means is in the non-real time at the time of executing the compression start instruction interruption processing shown in FIG. 7, the sequence proceeds to S36 and S37 following S29, and the field end code detection interruption and 1 Enable field read end interrupt. Subsequently, after outputting a file data input start instruction to the file data input switch 21 (S38), it is determined whether or not a field end code detection interrupt has occurred (S41) and whether or not a one-field reading end interrupt has occurred (S43). ), And sequentially determines whether or not a compression end instruction interrupt has occurred (S45). If no interrupt has occurred (S41: N
O, S43: NO, S45: NO), repeatedly execute the processing of S41 to S45, and wait until there is any interruption.

When a file data input start instruction is output in S38, the field end code separator 22
Non-real-time data from the video signal processing unit 15 is input via the file data input switch 21.
Then, the field end code separator 22 outputs the non-real-time video signal for one field to the switch 30,
Central processing unit 2 sends field end code detection interrupt
Output to 3.

Therefore, usually, an affirmative determination is made in S41. Then, the process sequentially proceeds to S51 and S53, and after inputting a file data input stop instruction to the file data input switch 21 (S51), outputs a synchronization signal generation instruction to the synchronization signal generator 24 (S53), and proceeds to S4.
The processing shifts to the loop processing of 1 to S45.

After the non-real-time video signal for one field is output to the switch 30 by this processing, the input of the non-real-time data via the file data input switch 21 is stopped (S51). Subsequently, when the synchronization signal generator 24 outputs a synchronization signal in response to the synchronization signal generation instruction (S
53), which is input to the compressor 60 via the switch 40. Then, the read controller 61 of the compressor 60 instructs the reading of the video signal for one field stored in the buffer 50, and provides the read operation to the compression operation by the configuration after the subtractor 62. When all the video signals for one field are read into the compressor 60, a one-field reading end interrupt is generated as described above.

When this one-field reading end interrupt is input to the central processing unit 23 (S43: YES), the process proceeds to S55, and the variable F is incremented by one. In subsequent S57, a file data input start instruction is output to the file data input switch 21, and then in S41 to S41.
The process proceeds to a loop process of S45. Then, the aforementioned S38
, The input of the non-real time data is restarted. Normally, S41 to S5
7, the input of non-real time data (S57) and the reading of the video signal into the compressor 60 (S53) corresponding to the input are sequentially executed for each field, and the non-real time Data compression is performed.

When a compression end instruction interrupt is input from the personal computer 3, an affirmative determination is made in S45, and the process proceeds to S61. In S61, it is determined whether or not a field end code detection interrupt has occurred. If the interrupt has not occurred (S61: NO), the process proceeds to S63. In S63, 1
It is determined whether a field read end interrupt has occurred or not (S63: NO).
Move to 1.

If a compression end instruction interrupt occurs during the input of non-real time data from the video signal processing unit 15, while the loop processing of S61 and S63 is repeated,
A positive determination is made at 61. Then, the aforementioned S51, S53
In the same manner as described above, the output of the file data input stop instruction is output (S6
5) And output the synchronization signal generation instruction (S67), and return to the loop processing. Thus, the reading of the video signal into the compressor 60 is started.

As described above, after the reading of the video signal is started (S67), or when a compression end instruction interrupt occurs during the reading of the video signal, a one-field reading end interrupt occurs soon (S63: YES). ). Then, the flow shifts to S71, where it is determined whether or not the variable F is an even number. As described above, the file 20 of the non-real time data
0 is constituted by a pair of top field video data 201 and bottom field video data 203. Therefore, when F is an odd number, it is understood that one of the paired video data is not read.

Therefore, when F is an odd number (S71: N
O), after incrementing F (S73) and outputting a file data input start instruction (S75), S61,
The process proceeds to a loop process of S63. When one field of non-real time data is input (S61: YE
S), reading of the video signal into the compressor 60 is started (S).
67), when the reading is completed (S63: YE)
S), and returns to S71 again. At this time, since F is an even number (S71: YES), the flow shifts to the next S77. Further, if F is an even number from the time when the process first shifts to S71, the process directly shifts to S77. In step S77, all interrupts are prohibited. In steps S78 and S79, a compression start instruction interrupt and a real-time / non-real-time switching interrupt are permitted, and the process proceeds to an infinite loop of step S5. With the above processing, after enabling the same interrupt as immediately after turning on the power,
It is possible to shift to the standby state in S5.

When the non-real-time data input from the video signal processing unit 15 is short, it is conceivable to detect the data end of the non-real-time data while executing the processing shown in FIG. In this case, when a one-field reading end interrupt is input from the compressor 60 (S43: Y
ES), and the process may directly proceed to S77.

As described above, in the moving image data compression device 1,
When a real-time / non-real-time switching interrupt is input from the personal computer 3, the controller 20 inputs a real-time / non-real-time switching signal to the switches 30 and 40, and compresses the real-time data recorded on the video tape 5. Or compression of the non-real time data recorded in the video file 7 can be arbitrarily switched. For this reason, only the data on the desired side can be reliably compressed. When compressing non-real-time data, the controller 20 inputs a video signal for one field to the buffer 50, and then sends a synchronization signal to the compressor 60 to read the data, indicating the end of the reading. When a one-field reading end interrupt occurs, the data of the next field is input to the buffer 50. Therefore, even non-real time data can be easily compressed.

Further, in the compressor 60, the compression controller 73
After the compression operation for one field is completed, each unit can be temporarily stopped until the next synchronization signal is input. Synchronization signals generated based on non-real-time data are not always generated at regular intervals, but the compressor 60 can realize a very accurate compression operation by the above configuration. That is, by temporarily stopping the operation of detecting the difference between the preceding and following moving image data, the data may change while the synchronization signal is delayed, or an error may occur because the difference is not detected by the subtractor 62. Can be prevented. Therefore, the compression operation of the non-real time data can be executed more reliably and accurately.

Further, in the moving picture data compression apparatus 1, since the video signal processing section 15 is provided before the controller 20, the non-real time data can be subjected to various editing and then compressed. Next, the configuration and operation of the video signal processing unit 15 will be described. First, when an application for editing non-real-time data is started on the personal computer 3, as shown in FIG.
02,... Are displayed on the screen 3a together with the comment 305 “Please select the processing content”. On the other hand, the storage device 17 stores modules (small software programs) 311, 312,... Corresponding to the processes displayed on the icons 301, 302,. The user clicks the icon 301, 302 or the like corresponding to the desired process, or inputs the name of the corresponding process (“process 1”, “process 2” in the example of FIG. 10) from a keyboard (not shown). Then, the modules 311 and 312 corresponding to the selected processing are transmitted from the storage device 17 to the video signal processing unit 15.

The video signal processing unit 15 includes a CPU, a ROM, and a RAM, as well as a well-known microcomputer.
(May be a flash ROM), and stores the module transmitted from the storage device 17 in the NVRAM.
To memorize. If any module is already stored in the NVRAM, the module is deleted and the transmitted module is stored. And
When a file data input start instruction is input to the file data input switch 21 and the file data input switch 21 starts inputting non-real time data, the video signal processing unit 15 outputs the non-real time input from the video file 7. The data is subjected to the processing corresponding to the above module and input to the file data input switch 21.

Normally, non-real-time data input from the video file 7 includes, for example, each frame in the order of a first frame, a second frame,. Are arranged in time series. In FIG. 11 and FIG. 12, which will be described later, the numbers in the squares indicate which frame of the data the data 211 corresponds to.

When the user selects the rewinding process as the module 1, the video signal processing unit 15 changes the arrangement of each frame 211 as follows and inputs the frame 211 to the file data input switch 21. That is, like the data 220 illustrated in FIG. 11, the data 211 of each frame is reversed in chronological order, and the ninth frame, the eighth frame,.
They are arranged in the order of the first frame and input to the file data input switch 21. The non-real-time data input by changing the arrangement in this way is compressed by the compressor 60 and output, and the output stream 8 is reproduced by a well-known decoder, as if the flow of time was reversed. A good rewind image is captured.

When the user selects the frame dropping process as the module 2, the video signal processing unit 15 inputs the data 211 of each frame to the file data input switch 21 (for example, every other one). That is, like the data 230 illustrated in FIG. 11, the first frame, the third frame, the fifth frame,... Are input. The non-real-time data thus processed is compressed and output by the compressor 60, and the output stream 8 is reproduced by a well-known decoder. A fast-forward video is captured.

It has been conventionally difficult to perform such processing as rewinding and frame dropping on real-time data, and good rewinding video and fast-forwarding video have not been obtained. On the other hand, in the moving image data compression apparatus 1, by performing processing on non-real time data, processing such as rewinding and frame dropping can be performed very easily and easily. Further, since the non-real-time data is directly processed, there is no need to convert the non-real-time data into real-time data and record it on the video tape 9 or the like, so that editing can be performed very easily. Further, there is no need to connect an editing device according to the processing. In addition, the storage device 17 further stores modules related to processing such as insertion of a logo, removal of noise, adjustment of brightness, blurring, gamma correction, fade-in, fade-out, and the like. It can be transmitted to the video signal processing unit 15 to execute the processing. Further, when a predetermined command is transmitted from the personal computer 3, the processing can be executed in combination. Further, since the modules 311 and the like stored in the storage device 17 can be handled in the same manner as a general software program, a module corresponding to a new process is additionally stored in the storage device 17 or the storage device 17 It is easy to rewrite the already stored module 311 and the like. In the compressor 60, since the operation of each unit can be temporarily stopped by the compression controller 73, a relatively heavy process is selected as the module, and the input speed of non-real-time data decreases (in this case, Even if the interval between the synchronization signals is long), accurate and reliable compression operation can be performed as described above. For this reason, it is possible to perform extremely various processes on the non-real-time data, and it is possible to satisfactorily expand the range of editing the non-real-time data. Also, the NVRAM of the video signal processing unit 15
Can easily be rewritten, so that a desired process can be selected from a plurality of types of processes and performed without changing the connection of the editing device. Therefore, editing becomes extremely easy.

When the power is turned on or reset, the data in the NVRAM of the video signal processing unit 15 is cleared, and the video signal processing unit 15 transmits the data 210 input from the video file 7 to the file data input switch 2 as it is.
Enter 1 In this case, the decoder can capture a normal video along a time series.

In the above embodiment, the data 210 sent from the video file 7 in chronological order is edited by performing processing.
It is also possible to edit non-real-time data by performing a process on the operation of a driver or the like that reads non-real-time data from (for example, by changing the driving process of the driver). That is, the non-real-time data 270 recorded in the video file 7 is configured to be readable from the data 211 corresponding to any frame as illustrated in FIG. Usually, the address of the data 211 of the first frame and the data 211 of the second frame
Are sequentially read to read the data 210 in time series.

Therefore, as shown in FIG. 12, when the forward processing as the module 1 is selected, the data 210 is read in time series as described above, and the rewind processing as the module 2 is selected. In this case, the data 220, which is chronologically reversed by reversing the address specification,
When the frame dropping process as the module 3 is selected, the address 230 is skipped and the data 230 with the dropped frame can be read. If the read operation is performed by the video signal processing unit 15 in this manner, the non-real-time data read from the video file 7 as described above is directly input to the file data input switch 21 as in the above embodiment. Similar actions and effects are produced.

If the non-real-time data includes instruction data for instructing processing to be performed by the video signal processing unit 15, the editing of the non-real-time data can be automatically performed as follows. The video signal processing unit 15 illustrated in FIG. 13 includes a signal identification unit 15a that identifies the instruction data.
When detecting the instruction data, the signal identification unit 15a selects a module corresponding to the instruction data from the modules 311 and the like stored in the storage device 17. Then, the selected module is transmitted to the video signal processing unit 15 and stored in the NVRAM, and as described above,
Processing such as rewinding and frame dropping can be executed while being switched as needed. Therefore, editing of non-real time data can be performed more easily.

Here, data 2 containing the above-mentioned instruction data
The configuration of No. 11 will be described in detail. As shown in FIG. 14, a general video image is composed of 480 vertical pixels × 720 horizontal pixels. As described above, the non-real-time data has the top field video data 201 and the bottom field video data 203. Therefore, FIG.
As illustrated in FIG.
Is, for example, data {CB (1,1) related to each pixel in an odd-numbered row.
1) to Y (479,720)}, and the bottom field video data 203 includes, for example, data {CB (2,1) to Y (480,720)} relating to each pixel in an even-numbered row. In FIG. 15, Y (m, n)
Represents the luminance data of the pixel in the m-th row and the n-th column, and CB (m, n) and CR (m, n) represent the color data of the pixel in the m-th row and the n-th column. Note that the color data is meaningful data in a set of CB and CR, but the number of sets is smaller than the number of pixels because color data is shared by adjacent pixels.

The top field video data 201
At the beginning of the bottom field video data 203, headers 201a and 203a are respectively provided. In the present embodiment, editing can be performed automatically as described above by writing the instruction data in the headers 201a and 203a.

In each of the above embodiments, the video signal processing section 15 and the file data input switch 21 of the controller 20 serve as non-real-time reading control means, and the synchronization signal generator 24 of the controller 20 serves as the second synchronization. A signal generator, a compressor 60 as a compressor, a video signal processor 15 as a processor, a driver (not shown) of the video file 7 for reading a module corresponding to the selection, and a signal identifier 15a
Corresponds to the selection means, and the compression controller 73 corresponds to the delay means.

The present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the gist of the present invention. For example, in each of the above embodiments, the processing is performed on the non-real-time data before the compression operation by the compressor 60, but the processing may be performed after the compression operation. In this case, for example, MP
Processing such as conversion from EG2 to MPEG1 and removal of unnecessary data can be performed. However, when processing is performed on non-real-time data before being compressed, the processing is directly performed on the original non-real-time data, so that extremely various processing can be performed as described above. Therefore, the range of editing non-real time data can be further expanded. On the other hand, when processing non-real-time data after compression (for example, data after variable-length encoding), the amount of data is reduced by compression. Can be applied. Therefore, the processing speed related to editing of non-real time data can be further improved. In this case, since the data amount is reduced, the memory capacity of the device can be reduced, and the manufacturing cost can be further reduced.

When the processing such as frame dropping is performed as described above, the stream 8 in which non-real time data is compressed as usual and the non-real time data are compressed after processing such as frame dropping are performed. The stream 8 and the stream 8 may be output in parallel. In this case, if the former stream 8 is reproduced by the decoder, a video as usual is obtained, and if the latter stream 8 is reproduced, a fast-forward video is obtained. That is, a stream 8 dedicated to fast forward is formed.
In this case, the fast forward of the video can be easily performed in the decoder. Further, a real-time reading means (recorder or the like) for reading real-time data from the video tape 5 and a non-real-time reading means (driver or the like) for reading non-real-time data from the video file 7 are provided by the synchronization signal generator 10 and the video signal The driving state is controlled according to the processing state of the processing unit 15, and these reading means may be provided integrally with the moving image data compression device 1 or separately.

In each of the above embodiments, the field end code detection interrupt is generated based on the top field start code 205 and the bottom field start code 207, and the compression operation is performed for each field. If the data length is constant, the compression operation for each field may be executed based on the data length. Further, the compression operation may be performed for each frame. Furthermore, the operation of compressing moving image data may be performed based on a standard other than MPEG. Furthermore, in the above embodiment, the compression operation of the compressor 60 is delayed by the above-described processing by the compression controller 73. However, various other configurations for delaying the compression operation are possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a moving image data compression device according to an embodiment.

FIG. 2 is a block diagram illustrating a configuration of a controller of the moving image data compression device.

FIG. 3 is an explanatory diagram illustrating a configuration of non-real-time data.

FIG. 4 is a block diagram illustrating a configuration of a compressor of the moving image data compression device.

FIG. 5 is a flowchart showing a main routine executed by the controller.

FIG. 6 is a flowchart illustrating real-time / non-real-time switching interrupt processing.

FIG. 7 is a flowchart illustrating compression start instruction interrupt processing.

FIG. 8 is a flowchart illustrating the continuation of the compression start instruction interruption process.

FIG. 9 is a flowchart showing further continuation of the compression start instruction interruption process.

FIG. 10 is an explanatory diagram illustrating a configuration and operation of a video signal processing unit of the moving image data compression device.

FIG. 11 is an explanatory diagram showing a change in non-real time data due to the operation.

FIG. 12 is an explanatory diagram illustrating an operation of another video signal processing unit.

FIG. 13 is an explanatory diagram illustrating a configuration and operation of still another video signal processing unit.

FIG. 14 is an explanatory diagram illustrating an array of pixels in a video image.

FIG. 15 is an explanatory diagram illustrating a configuration of non-real-time data corresponding to the video.

[Explanation of symbols]

1. Moving image data compression device 5. Video tape
7 Video file 15 Video signal processing unit 15a Signal identification unit
DESCRIPTION OF SYMBOLS 20 ... Controller 21 ... File data input switch 22 ... Field end code separator 23 ... Central processing unit 24 ... Synchronization signal generator
60 ... Compressor 61 ... Readout controller 62 ... Subtractor 73 ...
Compression controller

Claims (5)

[Claims] A moving image data compression apparatus for compressing moving image data read from a recording medium on which moving image data has been recorded, wherein the moving image data is recorded so as to be readable irrespective of the lapse of time. Reading control means for controlling the operation of the non-real-time reading means for reading the video data from the medium; compression means for compressing the video data read by the non-real-time reading means; and reading by the non-real-time reading means. Processing means capable of performing at least two or more types of processing on the moving image data or the operation of the non-real time reading means controlled by the reading control means; and the processing means performing the processing on the moving image data or the operation. A moving image data compression device, comprising: a selection unit for selecting a process. 2. A delay means for delaying the compression operation of the compression means when the time required for the processing means to perform the selected processing is longer than the time required for the compression operation of the compression means. The moving picture data compression device according to claim 1, further comprising: 3. The moving picture data compression device according to claim 1, wherein said processing means applies said selected processing to said moving picture data before a compression operation by said compression means. 4. The moving picture data compression apparatus according to claim 1, wherein said processing means performs said selected processing on said moving picture data after a compression operation by said compression means. . 5. When the moving image data includes instruction data for instructing processing to be performed by the processing means, the selecting means switches the selected processing at any time based on the instruction data. Claims 1-4
A moving image data compression device according to any one of the above.