JPH11103446A - Video recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable real time recording by controlling compressibility by comparing a 1st operation result of a recordable video data total amount with total record time of an inputted image that is requested by it with a 2nd operation result of code quantity by a code quantity counting means and elapsed time by an elapsed time counting means every prescribed time and controlling compressibility. SOLUTION: A record elapsed time counter 10 counts elapsed time from recording start and outputs an output Ts to a subtracter 13. A subtracter 12 subtracts an output Ds of a generation quantity data amount counter 8 from an output Dt of a recordable quantity register 7 and outputs the difference Dx to a compression controlling part 6. The subtracter 13 subtracts the output Ts of the counter 10 from an output Tt of a record target time register 9 and outputs the difference Tx to the part 6. When an actual decoding rate Dx /Tx which is undergone compression coding processing is smaller than an initial Dt /Tt , compressibility is lowered and code quantity is increased, and conversely when it is larger, the compressibility is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording apparatus that encodes a video signal by a variable rate compression method and records it on a recording medium such as an optical disk.

[0002]

2. Description of the Related Art In recent years, a video recording / reproducing apparatus for digitizing and recording a video signal on a recording medium such as a magnetic tape or an optical disk has been put into practical use with the progress of image compression / encoding technology.

In such an apparatus, a high-efficiency encoding method based on DCT is mainly used, but an appropriate compression method is adopted in consideration of storage capacity and accessibility of a medium. For example, in the case of a magnetic tape, high-speed access has some difficulties, but there is room in the recording capacity. The amount of data to be output is proportional to the actual video time. This has an advantage that special reproduction such as fast-forward reproduction or reverse reproduction can be easily realized while maintaining high image quality.

On the other hand, in the case of an optical disk, there is no margin in storage capacity as compared with a magnetic tape. For this reason, it is common to use a variable rate compression scheme that can increase the compression ratio more than the fixed rate compression scheme. The variable-rate compression method compresses data even in the time direction. Control is performed in such a manner that a large amount of data is allocated to video scenes with fine patterns and fast movement, and the amount of data is suppressed in video scene parts with little movement. I do.

[0005] The compression effect is weak in an image source in which the video scene constantly changes, but is very high in an image source in which scenes with almost no change in the scene such as a movie are mixed. There is an advantage that image quality can be obtained. By introducing this variable rate compression method in DVD video, high image quality and long time reproduction can be realized.

[0006]

As described above, the variable rate compression method has a high compression efficiency in a general image source with few scene changes, and can obtain high image quality even with a small data amount. However, since the amount of data at the time of compression encoding is not proportional to the video time of the source, it is necessary to predict in advance how long the video time can be recorded for a limited recording capacity. There is also a drawback that you can not.

[0007] In the case of a reproduction-only machine such as a DVD video, re-recording at the stage of producing a disc is permitted. Therefore, the encoding process is tried several times while controlling the compression rate, and the data amount is adjusted to adjust the recording capacity. However, in the case of a recording / reproducing device such as a movie camera, which must record in real time at that time, it is inconvenient to know how much video time can be recorded .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a video recording apparatus which eliminates the above-mentioned drawbacks, secures a recording time intended by a user even by using a variable rate compression system, and is capable of real-time recording.

[0009]

SUMMARY OF THE INVENTION A video recording apparatus according to the present invention is a video recording apparatus which digitally encodes a video signal and records the video signal. The video signal is obtained by compressing and encoding a video signal digitized in frame units with various compression ratio parameters. Encoding means, data recording means for recording video data compressed and encoded by the video encoding means, code quantity counting means for counting the code quantity of video data generated by the compression encoding by the video encoding means, Elapsed time counting means for counting the elapsed time from the start of the compression coding process in the video coding means, and the total amount of video data recordable by the data recording means and the total recording time of the input video required for the total video data amount , The code amount counted by the code amount counting means, and the elapsed time from the elapsed time counting means. The second operation result and, and a compression control unit for controlling the compression rate parameter of the video coding means based on a comparison result obtained by comparing at predetermined time intervals.

A video recording apparatus according to the present invention, in which a video signal is digitally encoded and recorded, includes video encoding means for compressing and encoding a video signal digitized in frame units with various compression ratio parameters. Data recording means for recording video data compressed and encoded by the encoding means; code quantity counting means for counting the code quantity of video data generated by the compression encoding by the video encoding means; compression in the video encoding means; Elapsed time counting means for counting the elapsed time from the start of the encoding process, and a change trigger in which the generation cycle of the change trigger signal varies according to the remaining recording time obtained by subtracting the elapsed time from the elapsed time counting means from the target recording time. Generating means, and the total amount of video data recordable by the data recording means and the total amount of video data are required. A first calculation result of the total recording time of the force image, the second elapsed time and obtained from the counted code amount and the elapsed time counting means in said code amount counting means
And a compression control unit for changing a compression ratio parameter of the video encoding unit based on a comparison result obtained by comparing the calculation result of the above with each time a change trigger signal is generated from the change trigger generation unit.

A video recording apparatus according to the present invention, in which a video signal is digitally encoded and recorded, includes video encoding means for compressing and encoding a video signal digitized on a frame basis, and a compression encoding method for the video encoding means. Data recording means for recording the encoded video data, code amount counting means for counting the code amount of the video data generated by the compression encoding by the video encoding means, from the start of the compression encoding process in the video encoding means Elapsed time counting means for counting the elapsed time of a change trigger signal, wherein the generation cycle of the change trigger signal varies according to the difference between the code rate of the video data compressed and coded by the video coding means and the target average code rate. Means, and the total amount of video data recordable by the data recording means and the input video required for the total amount of video data. The first calculation result of the recording time and the second calculation result of the code amount counted by the code amount counting means and the elapsed time obtained from the elapsed time counting means are used for each generation of the change trigger signal. And compression control means for changing the compression ratio parameter of the video encoding means based on the comparison result obtained by the comparison.

A video recording apparatus according to the present invention is a video recording apparatus which digitally encodes a video signal and records the video signal. The video encoding means compresses and encodes the video signal digitized in frame units. Data recording means for recording the encoded video data, code amount counting means for counting the code amount of the video data generated by the compression encoding by the video encoding means, from the start of the compression encoding process in the video encoding means Elapsed time counting means for counting the elapsed time, the total amount of video data recordable by the data recording means, the code amount counted by the code amount counting means, and the elapsed time obtained from the elapsed time counting means, Remaining time calculating means for calculating the remaining time by calculating every predetermined time, and the remaining amount calculated by the remaining time calculating means And a display means for displaying between.

A video recording apparatus according to the present invention, in which a video signal is digitally encoded and recorded, includes video encoding means for compressing and encoding a video signal digitized in units of frames, and a compression encoding method using the video encoding means. Data recording means for recording the encoded video data, code amount counting means for counting the code amount of the video data generated by the compression encoding by the video encoding means, from the start of the compression encoding process in the video encoding means Elapsed time counting means for counting the elapsed time, calculating the total amount of video data recordable by the data recording means, the code amount counted by the code amount counting means, and the elapsed time obtained from the elapsed time counting means. The remaining time calculating means for calculating the remaining time by using the elapsed time counting means obtained from the provisionally determined scheduled recording time. Provisional remaining time calculating means for calculating a difference between the elapsed times, a selecting means for selecting one of the remaining time by the remaining time calculating means and the provisional remaining time by the provisional remaining time calculating means, It comprises a display means for displaying the remaining time or the provisional remaining time selected by the selection means.

A video recording apparatus according to the present invention, in which a video signal is digitally encoded and recorded, includes a video encoding means for compressing and encoding a video signal digitized in frame units, and a compression encoding by the video encoding means. Data recording means for recording the encoded video data, code amount counting means for counting the code amount of the video data generated by the compression encoding by the video encoding means, from the start of the compression encoding process in the video encoding means Elapsed time counting means for counting the elapsed time of the data, the total amount of video data recordable by the data recording means, the code amount counted by the code amount counting means, and the elapsed time obtained from the elapsed time counting means. A remaining time calculating means for calculating the remaining time by calculating for each time, and a minimum remaining time calculated by the remaining time calculating means. When the remaining time calculated by the storage means and the remaining time calculation means is smaller than the remaining time of the storage means, the remaining time from the remaining time calculation means is displayed, When the remaining time calculated by the remaining time calculating means is longer than the remaining time of the storing means, the display means is configured to display the remaining time of the storing means.

A video recording apparatus according to the present invention is a video recording apparatus for digitally encoding a video signal and recording the video signal. The video encoding means compresses and encodes the video signal digitized in frame units. Data recording means for recording the encoded video data, a code amount counting means for counting the code amount of the video data generated by the compression encoding, and counting an elapsed time from the start of the compression encoding process in the video encoding means. Elapsed time counting means, and total data amount D recordable by the data recording means
t and the code amount D counted by the code amount counting means.
s and the elapsed time Ts obtained from the elapsed time counting means.
And the remaining time calculating means for calculating the remaining time Tz by the operation formula Tz = Ts × (Dt−Ds) / Ds.

A video recording apparatus according to the present invention, which digitally encodes and records a video signal, compresses and encodes the video signal digitized in frame units using various compression rate parameters or a constant compression rate parameter. Video encoding means, data recording means for recording video data compressed and encoded by the video encoding means, selecting means for selecting whether to give priority to securing recording time or to giving priority to image quality, and recording by the selecting means When the priority of time securing is selected, control is performed to perform compression encoding using various compression ratio parameters of the video encoding means. When the priority of image quality is selected by the selecting means, the video encoding means is controlled. And compression control means for controlling the compression and encoding by using the constant compression ratio parameter.

A video recording apparatus according to the present invention, in which a video signal is digitally encoded and recorded, includes video encoding means for compressing and encoding a video signal digitized in units of frames, and a compression encoding method using the video encoding means. Data recording means for recording the encoded video data, code amount counting means for counting the code amount of the video data generated by the compression encoding by the video encoding means, from the start of the compression encoding process in the video encoding means Elapsed time counting means for counting the elapsed time, calculating the total amount of video data recordable by the data recording means, the code amount counted by the code amount counting means, and the elapsed time obtained from the elapsed time counting means. The remaining time calculating means for calculating the remaining time by using the total recording time of the input video required for the total video data amount. Differential time calculating means for calculating a difference time from the elapsed time obtained from the overtime counting means, selecting means for selecting whether to give priority to securing the recording time or giving priority to image quality, and priority for securing the recording time is provided by the selecting means. When the selection is made, the difference time calculated by the difference time calculation means is displayed, and when the priority of the image quality is selected by the selection means, the remaining time calculated by the remaining time calculation means is displayed. Display means.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a video recording / reproducing apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block configuration on the recording side of the video recording / reproducing apparatus. That is, a camera unit 1 that captures an image and outputs a video signal, a video input processing unit 2 that converts a video signal transmitted from the camera unit 1 into a digital signal, and a DCT that converts the video signal from the video input processing unit 2 into a DCT. A compression encoding unit 3 for performing compression encoding using a high-efficiency encoding method by conversion; a buffer memory 4 for temporarily storing image data compressed and encoded by the compression encoding unit 3; A data recording unit 5 for recording the image data stored therein, a recordable amount register 7 in which the amount of data recordable in the data recording unit 5 is stored in advance, and a data amount generated from the compression encoding unit 3. The generated data amount counter 8 to be counted and how much video time is to be recorded in the recordable data area of the data recording unit 5 are set and stored in advance. A recording target time register 9, a recording elapsed time counter 10 for counting an elapsed time from the start of recording, a counter 11 for transmitting a change trigger signal at predetermined time intervals, and a recordable amount register 7 for recording. A subtracter 12 for subtracting the count value of the generated data amount counter 8 from the data amount, and a recording elapsed time counter 1 from the recording target time of the recording target time register 9
Subtractor 1 for subtracting the elapsed time from the start of recording 0
3. Every time a change trigger signal is transmitted from the counter 11 after a predetermined time has elapsed after the start of the encoding process for the video data, the recordable data amount of the recordable amount register 7 and the recording target time A compression control unit that calculates a compression ratio parameter in the compression encoding unit 3 according to the recording target time of the register 9 and each output value of the subtractors 12 and 13, and changes the compression encoding unit 3 with the calculated compression ratio parameter. 6 is comprised.

The compression encoding unit 3 employs a high-efficiency encoding method based on DCT conversion, and the amount of data is suppressed in a video scene portion where a picture is flat and motion is small, but a picture in which a picture is fine and motion is intense. In a scene, a variable rate compression method is used in which a large amount of code data is generated.

The buffer memory 4 absorbs a change in the data amount in the time direction, and stops the recording operation until the accumulated data amount reaches a certain reference. The intermittent data recording operation is performed in the form of sending and recording at high speed.

The compression control unit 6 receives the output value Dt of the recordable amount register 7, the difference value Dx between Dt and the output value Ds of the generated data amount counter 8, the output value Tt of the recording target time register 9, and A difference value Tx between Tt and the output value Ts of the recording elapsed time counter 10 is input.

In the recordable amount register 7, the amount of data that can be recorded in the data recording unit 5 is initially set to the amount of data read from the data recording unit 5 by a control unit (not shown). For example, "4 GB" is set if the optical disk to be recorded is a 4 GB capacity and all the free areas. The output value Dt of the recordable amount register 7 is output to the compression control unit 6 and the subtractor 12.

The generated data amount counter 8 counts (accumulates and adds) the amount of data generated from the compression encoding unit 3 and resets it when a reset request to the recording target time register 9 occurs. It has become. The output value Ds of the generated data amount counter 8 is output to the subtractor 12.

The recording target time register 9 is set with how much video time is to be recorded in the recordable data area of the data recording unit 5, and the recording manually set by the user by a control unit (not shown). The target time is set initially. However, since it is necessary to provide a limit in order to maintain a certain level of image quality, a standard recording time is given in advance as a reference value, and is increased or decreased within a predetermined range. The output value Tt of the recording target time register 9 is
It is output to the compression control section 6 and the subtractor 13.

The recording elapsed time counter 10 counts the elapsed time from the start of recording based on a clock from a signal generator (not shown). Like the generated data amount counter 8, the recording target time register 10 9 is reset when a reset request to 9 is issued. The output value Ts of the recording elapsed time counter 10 is calculated by the subtracter 1
3 is output.

The subtracter 12 calculates the output value Dt of the generated data amount counter 8 from the output value Dt of the recordable amount register 7.
The difference value Dx is output to the compression control unit 6.

The subtractor 13 subtracts the output value Ts of the recording elapsed time counter 10 from the output value Tt of the recording target time register 9, and outputs the difference value Tx to the compression control section 6.

After a predetermined time has elapsed from the start of the encoding process on the video data, the compression control unit 6 determines whether or not the video data has been compressed by the compression encoding unit 3 in accordance with the input output values Dt, Dx, Tt, and Tx. The compression ratio parameter is changed.

The criteria for changing the compression ratio parameter are as follows. No change if Dt / Tt = Dx / Tx, but if Dt / Tt> Dx / Tx, change compression parameter to lower compression ratio; if Dt / Tt <Dx / Tx, increase compression ratio Change the compression parameter to

That is, with respect to the target code rate (Dt / Tt) set in the initial state, the actual code rate (Dx / Tt) that has been subjected to the compression encoding process until a predetermined time has elapsed.
If Tx) is small, the compression rate is decreased to increase the code amount, and if the actual code rate (Dx / Tx) is higher than the target code rate (Dt / Tt), the compression rate is increased to decrease the code amount. It has become.

The change processing of the compression ratio parameter is performed by the counter 1
This is performed according to the generation of a change trigger signal sent from 1 every predetermined time. For example, assuming that the predetermined time interval is 1 minute, when the first minute has elapsed, the code rate coded for one minute from the start of the coding process is compared with the target code rate, and
When the minute has elapsed, the code rate for 2 minutes from the start of the encoding process is compared with the target code rate, and when 3 minutes have elapsed, the code rate for 3 minutes from the start of the encoding process is compared with the target code rate. Then, a change process is performed.

As described above, since the compression rate parameter is changed by comparing the code rate from the start of recording to the elapsed time and the target code rate, no error is accumulated and the initially set recording target time As close as possible.

(Second Embodiment) In the first embodiment, the case where the change trigger signal from the counter 11 has a constant period has been described. However, the change trigger signal does not necessarily need to be generated at a constant period. Instead, as a second embodiment, the generation cycle of the change trigger signal may be changed according to the elapsed time from the start of recording.

For example, FIG. 2 shows a recording side configuration of a video recording / reproducing apparatus in which the generation cycle of the change trigger signal changes according to the elapsed time from the start of recording. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 2 shows FIG.
Is changed to a period variation counter 21.

That is, the difference value (remaining recording time) Tx between the output value Tt of the recording target time register 9 from the subtractor 13 and the output value Ts of the recording elapsed time counter 10 is input to the periodic variation counter 21. It has become.

The period variation counter 21 indicates that the remaining recording time T
The generation cycle of the change trigger signal to be sent to the compression control unit 6 is changed in accordance with the value of x. When the value of the remaining recording time Tx is large, it is long, and when the value of the remaining recording time Tx becomes small. The generation cycle is shortened.

For example, as shown in FIG. 3, an example of changes in the remaining recording time Tx, the recordable data amount Dx, and the actual code rate (Dx / Tx) when the recording elapsed time Ts is plotted on the horizontal axis is shown. While the remaining recording time Tx is between 60 minutes and 10 minutes, a change trigger signal is generated at 5 minute intervals.
When it is less than one minute, the interval is one minute.

This means that in the first 50 minutes, even if the actual code rate (Dx / Tx) slightly deviates from the target code rate (Dt / Tt) in order to give priority to the image quality, it is very forcible. Although compression control is not performed, fine control is performed after the remaining 10 minutes, and priority is given to securing recording time.

(Third Embodiment) As a third embodiment, the generation cycle of the change trigger signal depends on the amount of deviation of the actual code rate (Dx / Tx) from the target code rate (Dt / Tt). May be varied.

For example, FIG. 4 shows the target code rate (Dt /
Tt) varies the generation cycle of the change trigger signal according to the amount of deviation of the actual code rate (Dx / Tx) from Tt). The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 4 is a modification of the counter 11 of FIG.

That is, the difference between the target code rate and the actual code rate from the compression control unit 13 is input to the period variation counter 22. Further, the compression control unit 13 sets the target code rate (D
t / Tt) and the difference between the actual code rate (Dx / Tx) and the difference (Dt / Tt-Dx /
Tx) is calculated and output to the period variation counter 22.

The period change counter 22 changes the generation cycle of the change trigger signal in accordance with the magnitude of the difference value. The change trigger signal is generated in a short cycle when the difference value is large, and in a long cycle when the difference value is small.

Thus, the target code rate (Dt / T
Even when the actual code rate (Dx / Tx) with respect to t) is greatly deviated, the correction is performed quickly, and when combined with the above-described second embodiment, a further effect is obtained when the remaining recording time Tx is reduced. Can be expected.

In the first to third embodiments so far, the main focus has been on how to secure the target recording time. However, depending on the application, the securing of the recording time may be sacrificed. Sometimes, it is desired to prioritize recording of higher quality video.

In this case, it is important to tell the user how much video time can be recorded, and this is an essential element as a guide for replacing the recording medium.
Therefore, in the fourth and fifth embodiments described below, a case in which high-quality video recording is prioritized will be described.

(Fourth Embodiment) As a fourth embodiment, as shown in FIG. 5, a remaining time display is performed in a state where recording of high quality video is prioritized.

In the case of FIG. 5, the basic configuration for processing the video signal is the same as that of the first embodiment shown in FIG. 1, except that the control of the compression parameters for the compression encoder 3 is not performed.

That is, the compression coat roller unit 6 and the counter 11 shown in FIG. 1 are removed, and the compression encoding unit 3 performs the compression encoding with a predetermined (fixed) compression parameter. Display selector 24, remaining time display unit 2
5 has been added.

The remaining time calculation unit 23 outputs the output value Ds of the generated data amount counter 8, the difference value Dx between the output value Dt of the recordable amount register 7 from the subtractor 12 and the output value Ds, and the elapsed recording time. The output value Ts of the counter 10 is input.

The remaining time calculator 23 calculates the estimated remaining power from the input output value Ds, difference value Dx, and output value Ts at predetermined time intervals after the encoding process for the video data is started. The time “Tz = Ts × (Dx / Ds)” is obtained.

The estimated remaining time Tz calculated by the remaining time calculator 23 is output to the A input terminal of the display selector 24. The calculation cycle of the estimated remaining time Tz is arbitrary, and may be, for example, every second.

However, since the code rate is not averaged immediately after the start of the encoding process, the value of the estimated remaining time Tz fluctuates greatly, and the displayed remaining time is frequent until a certain time has elapsed. It is not very good to increase or decrease.

In any case, since the estimated remaining time Tz cannot be calculated unless the encoding process is started, it is necessary to display some remaining time in the initial state. In consideration of such circumstances, for example, the recordable time when encoding at the highest code rate is temporarily set as the remaining time in the recording target time register 9 and the output value of the recording target time register 9 is set. The difference value Tx of Tt and the output value Ts of the recording elapsed time counter 10 by the subtractor 13 is sent to the B input terminal of the display selector 24.

The display selector 24 is controlled by a control unit (not shown) to select the B input (Tx value) until a predetermined time elapses after the start of the encoding process, and then select the A input (Tz value). Then, it outputs to the time display section 25. The time display unit 25 converts the input difference value Tx or the estimated remaining time Tz into hours, minutes, and seconds and displays the converted value.

(Fifth Embodiment) As a fifth embodiment, as shown in FIG. 6, a remaining time display with a hold function is displayed.

In FIG. 6, except for the addition of the minimum value hold circuit, the basic configuration for processing the video signal is as follows.
This is similar to the fourth embodiment in FIG. That is, FIG.
Is provided with a minimum value hold circuit 26 between the output of the remaining time calculation unit 23 in FIG. 5 and the A input terminal of the display selector 24.

The estimated remaining time Tz output from the remaining time calculation unit 23 is an estimated value on calculation, and therefore may increase when the code rate is significantly reduced. For this reason, the estimated remaining time T output from the remaining time calculation unit 23
z is sent to the A input terminal of the display selector 24 after passing through the minimum value holding circuit 26.

The minimum value hold circuit 26 holds the previous value if the new value is larger than the previous value, and updates the new value if the new value is smaller. The remaining time displayed on the display unit 25 is prevented from increasing or decreasing.

(Sixth Embodiment) As a sixth embodiment, a case will be described in which the user can select whether to give priority to securing the recording time or give priority to the image quality.

In the case of FIG. 7, the basic configuration of the first embodiment shown in FIG. 1 is different from the basic configuration of the first embodiment shown in FIG. A mode changeover switch 27 for selecting between the recording time priority mode and the image quality priority mode has been added.

For example, when the mode changeover switch 27 is in the recording time priority mode, that is, when the compression control section 6 is enabled based on a change trigger signal from the counter 11, the B input terminal of the display selector 24 is selected as enabled. In this case, the compression control unit 6 operates according to the difference value Dx, the difference value Tx, the output value Dt, and the output value Tt, and the remaining time display unit 25 uses the difference value Tx by the subtractor 13 as the remaining time. indicate.

When the mode changeover switch 27 is in the image quality priority mode, that is, when the compression control section 6 is selected to be invalid and the A input terminal of the display selector 24 is selected to be valid, the compression control section 6 is turned off. The state is set (the compression encoding unit 3 performs compression encoding with a predetermined compression parameter), and the estimated remaining time Tz by the remaining time calculation unit 23 is displayed on the remaining time display unit 25 as the remaining time. .

As described above, the user can select a mode suitable for the purpose, whether the priority is on the recording time or the image quality. In the case of the priority on the recording time, the user intends to take advantage of the good image quality of the variable rate compression method. The recording time can be secured, and even when priority is given to image quality, the display shows how much video time can be recorded during recording. Even in the case of a recording / reproducing device that must record in real time, you can see how much video time can be recorded,
Many effects can be obtained, for example, the timing of changing the recording medium can be grasped in advance.

[0065]

As described above in detail, according to the present invention, the recording time intended by the user can be ensured even if the variable rate compression method is used, real-time recording is possible, and even if the image quality is prioritized, the recording is performed. It is an object of the present invention to provide a video recording device that can know how much video time can be recorded on the way.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a recording side configuration of a video recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a recording side configuration of a video recording / reproducing apparatus in which a generation cycle of a change trigger signal changes according to an elapsed time from a start of recording according to a second embodiment.

FIG. 3 is a diagram for explaining a recording elapsed time with respect to a remaining recording time and a change state of a data rate in the recording elapsed time in the second embodiment.

FIG. 4 is a block diagram illustrating a recording side configuration of a video recording / reproducing apparatus in which a generation cycle of a change trigger signal changes according to an actual code rate deviation from a target code rate in a third embodiment.

FIG. 5 is a block diagram illustrating a recording-side configuration of a video recording / reproducing apparatus in which a remaining time is displayed according to a fourth embodiment.

FIG. 6 is a block diagram showing a recording-side configuration of a video recording / reproducing apparatus that has a hold function and displays a remaining time according to a fifth embodiment.

FIG. 7 is a block diagram showing a recording-side configuration of a video recording / reproducing apparatus capable of switching between a recording time priority mode and an image quality priority mode in a sixth embodiment.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 camera unit 2 video input processing unit 3 compression encoding unit (video encoding unit) 4 buffer memory 5 data recording unit (data recording unit) 6 compression control unit (compression control unit) 7 recordable Quantity register 8 Generated data quantity counter (code quantity counting means) 9 Recording target time register 10 Recording elapsed time counter (elapsed time counting means) 11 Counter 12 Subtractor 13 Subtractor (Temporary remaining time calculating means) 21) Period variation counter (change trigger generating means) 23 ... Remaining time calculating unit (remaining time calculating unit) 24 ... Display selector (selecting unit) 25 ... Remaining time displaying unit (displaying unit) 26 minimum value hold circuit 27 mode switch (selection means)

Claims (9)

[Claims] 1. A video recording device for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized for each frame with various compression ratio parameters; Data recording means for recording video data compression-encoded by the following; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and a compression code in the video encoding means. Elapsed time counting means for counting the elapsed time from the start of the conversion processing; first calculation result of the total amount of video data recordable by the data recording means and the total recording time of the input video required for the total amount of video data And a second calculation result of the code amount counted by the code amount counting means and the elapsed time from the elapsed time counting means, Video recording apparatus characterized by comprising a compression control unit for controlling the compression rate parameter of the video coding means based on the comparison results obtained by comparing each between. 2. A video recording device for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized for each frame with various compression ratio parameters; Data recording means for recording video data compression-encoded by the following; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and a compression code in the video encoding means. Time counting means for counting the time elapsed from the start of the conversion process, and a change trigger in which the generation cycle of the change trigger signal varies according to the remaining recording time obtained by subtracting the elapsed time from the elapsed time counting means from the target recording time. Generating means, the total amount of video data recordable by the data recording means and the input video required for the total amount of video data. The first calculation result of the total recording time, and the second calculation result of the code amount counted by the code amount counting means and the elapsed time obtained from the elapsed time counting means are calculated by the change trigger generating means. Compression control means for changing a compression ratio parameter of the video encoding means based on a comparison result obtained by comparison every time a change trigger signal is generated. 3. A video recording apparatus for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized in frame units; and compression encoding by the video encoding means. Data recording means for recording video data; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and An elapsed time counting means for counting an elapsed time; and a change trigger generating means for changing a generation cycle of a change trigger signal in accordance with a difference between a code rate of the video data compressed and coded by the video coding means and a target average code rate. Means, the total amount of video data recordable by the data recording means and the total recording time of the input video required for the total amount of video data And a second calculation result of the code amount counted by the code amount counting means and the elapsed time obtained from the elapsed time counting means, each time the change trigger signal is generated. And a compression control means for changing a compression ratio parameter of the video encoding means based on the comparison result obtained as described above. 4. A video recording apparatus for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized in frame units; and compression encoding by the video encoding means. Data recording means for recording video data; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and Elapsed time counting means for counting the elapsed time, the total amount of video data recordable by the data recording means, and the code amount counted by the code amount counting means,
Remaining time calculating means for calculating the remaining time by calculating the elapsed time obtained from the elapsed time counting means at predetermined time intervals; and a display for displaying the remaining time calculated by the remaining time calculating means. Means, and a video recording apparatus, characterized by comprising: 5. A video recording apparatus for digitally encoding and recording a video signal, comprising: video encoding means for compression encoding a video signal digitized in frame units; and compression encoding by the video encoding means. Data recording means for recording video data; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and Elapsed time counting means for counting the elapsed time, the total amount of video data recordable by the data recording means, and the code amount counted by the code amount counting means,
Remaining time calculating means for calculating the remaining time by calculating the elapsed time obtained from the elapsed time counting means; and calculating the difference between the elapsed time obtained from the elapsed time counting means from the provisionally determined scheduled recording time. Provisional remaining time calculating means, and selecting means for selecting one of the remaining time by the remaining time calculating means and the provisional remaining time by the provisional remaining time calculating means; Display means for displaying the remaining time or the provisional remaining time, a video recording apparatus. 6. A video recording apparatus for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized in frame units; Data recording means for recording video data; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and Elapsed time counting means for counting the elapsed time, the total amount of video data recordable by the data recording means, and the code amount counted by the code amount counting means,
A remaining time calculating means for calculating the remaining time by calculating the elapsed time obtained from the elapsed time counting means for each predetermined time; and updating the minimum value of the remaining time calculated from the remaining time calculating means. When the remaining time calculated by the remaining time calculating means is smaller than the remaining time of the storing means, the remaining time from the remaining time calculating means is displayed. A video recording apparatus comprising: a display unit that displays the remaining time of the storage unit when the remaining time calculated by the amount of time calculation unit is larger than the remaining time of the storage unit. 7. A video recording apparatus for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized on a frame-by-frame basis; Data recording means for recording video data; code quantity counting means for counting the code quantity of video data generated by the compression encoding; and elapse of counting the elapsed time from the start of the compression encoding process in the video encoding means. A time counting means, and a total data amount Dt recordable by the data recording means.
And the code amount Ds counted by the code amount counting means.
And a remaining time calculating means for calculating a remaining time Tz by an arithmetic expression Tz = Ts × (Dt−Ds) / Ds from the elapsed time Ts obtained from the elapsed time counting means. Video recording device. 8. Video encoding means for compressing and encoding a video signal digitized in units of frames using various compression ratio parameters or a constant compression ratio parameter in video recording for recording a video signal by digital encoding. Data recording means for recording the video data compressed and encoded by the video encoding means, selecting means for selecting whether to give priority to securing the recording time or to giving priority to the image quality, and securing the recording time by the selecting means. When priority is selected, control is performed to perform compression encoding using various compression ratio parameters of the video encoding unit, and when the priority of image quality is selected by the selection unit, a fixed value of the video encoding unit is set. Compression control means for performing control of compression coding using a compression ratio parameter. 9. A video recording apparatus for digitally encoding and recording a video signal, comprising: video encoding means for compressing and encoding a video signal digitized in frame units; and compression encoding by the video encoding means. Data recording means for recording video data; code amount counting means for counting the code amount of video data generated by the compression encoding by the video encoding means; and Elapsed time counting means for counting the elapsed time, the total amount of video data recordable by the data recording means, and the code amount counted by the code amount counting means,
Remaining time calculating means for calculating the remaining time by calculating the elapsed time obtained from the elapsed time counting means; and obtaining from the elapsed time counting means from the total recording time of the input video required for the total video data amount. A difference time calculating means for calculating a difference time from the elapsed time; a selecting means for selecting whether to give priority to securing the recording time or to giving priority to the image quality; and when the priority for securing the recording time is selected by the selecting means, Display means for displaying the difference time calculated by the difference time calculation means, and displaying the remaining time calculated by the remaining time calculation means when the priority of the image quality is selected by the selection means; A video recording device, comprising: