JPH0413913B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a video recording device, and in particular, it records video data of a continuously moving subject for each predetermined number of screens, and also records the video data of a continuously moving subject for each predetermined number of screens, and The present invention relates to a video recording device that detects an instantaneous action and reliably records video data at the time of the instantaneous action.

(Prior Art) Conventionally, there has been a device that can correct the ball hitting form by continuously recording the ball hitting form such as a golf swing or bat swing when hitting a ball placed at a set position, and viewing the playback image. is proposed. Such video recording devices include
An image memory is used to record video data obtained from a video input device. Since the capacity of this image memory cannot be increased too much from an economic standpoint, video data is recorded in the image memory for each predetermined number of screens (for example, every 3 screens). There is.

(Problem to be Solved by the Invention) However, in the case of the conventional example having such a configuration, since the video data is uniformly thinned out, a specific instantaneous motion during continuous motion may not be recorded. be. For example, in a device that records the ball hitting form such as a golf swing as mentioned above, the moment of impact of the ball is important;
With conventional equipment, the moment of impact was sometimes not recorded. Such a problem becomes more noticeable as the number of video data thinned out increases. Therefore, in conventional devices, there is a limit to how much video data can be thinned out, and as a result, there is a problem in that the capacity of the image memory cannot be reduced very much.

The present invention has been made in view of the above circumstances, and it is possible to reduce the capacity of the image memory by thinning out the video data, and also to reduce the capacity of the image memory by thinning out the video data. It is an object of the present invention to provide a video recording device that can also reliably record images.

(Means for solving the problems) In order to achieve such an object, the present invention has the following features:
It has the following characteristics:

That is, the video recording device according to the present invention includes a video input device, an image memory capable of recording video data from the video input device for multiple screens, and a control circuit for writing the video data into the image memory. , a sensor for detecting whether or not a predetermined object is at a predetermined position, the control circuit writes video data for each predetermined number of images into the image memory, and the sensor detects that the predetermined object is missing. If detected, the video data at that time and
The present invention is characterized in that at least one of the immediately following video data is written into the image memory.

(Function) When recording is started, the control circuit sequentially records the video data in the image memory while thinning out video data corresponding to a predetermined number of screens. When a specific instantaneous motion is detected by the sensor, the control circuit always records the video data at this time in the image memory. After that, the video data is again thinned out and recorded in the image memory in the same manner as described above.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 is a block diagram schematically showing the configuration of a video recording device according to an embodiment of the present invention;
FIG. 2 is an external perspective view of the video recording device.

In FIG. 2, a video camera 12 as an image input device is attached to the upper end of a support rod 11 that is erected substantially perpendicular to the floor surface. The angle of the video camera 12 is set so that it can photograph the golf swing of the operator 20 standing in front of the recording device 10. A monitor television 13 is installed below the video camera 12. A recorded golf swing image of the operator 20 is displayed on the monitor television 13.

Detectors 14 and 15 are provided at the base of the support rod 11 to detect the presence or absence of a golf ball 21 placed at a predetermined set position. Detector 14
is used to detect the ball 21 set at a high position when using a wood club. On the other hand, the detector 15 is used to detect a ball set at a low position when an iron club is used. These detectors 14,1
Reference numeral 5 includes a light irradiation section (not shown) for irradiating light onto the golf ball placed at the set position, and a light receiving section (not shown) for receiving the reflected light.

Further, below the support rod 11, this recording device 1
A blue lamp 16 and a red lamp 17 are provided as means for displaying the zero operating state. A detection lever 18 is provided on the side surface of the box where these lamps are installed to detect when the ball has been set. After the operator 20 sets the ball 21 at the set position, by pushing the detection lever 18 with, for example, a club 22, it is detected that the ball setting has been completed.

Attached below the television monitor 13 is a control box 19 that houses a control circuit for recording video data obtained from the video camera 12, an image memory, and the like.

Also, on the front of this control box 19 are a step playback switch SW1 and an auto playback switch.
SW2, a recording storage switch SW3, and a stored image playback switch SW4 are attached. The step playback switch SW1 is used to play back recorded images in steps. The auto playback switch SW2 is used when playing back recorded images by automatic forwarding. Recording save switch
SW3 is used when it is desired to record and save an arbitrary image among a plurality of recorded images. The saved image playback switch SW4 is a switch used when calling up the image recorded and saved in the previous swing recording and displaying it on the monitor television 13.

Next, the block diagram shown in FIG. 1 will be explained.

The video signal output from the video camera 12 is
The signal is applied to a synchronization separation circuit 30 and an A/D converter 31. The A/D converted video data is given to the image memory 32. This image memory 32 has 32
It consists of RAM (Random Access Memory) with storage capacity to record 1 screen. The synchronization separation circuit 30 separates horizontal and vertical synchronization pulses from the input video signal and supplies them to the counter 33.
The output signal of the counter 33 is given to the CPU 34 and the address signal generation circuit 35.

The CPU 34 includes ball detectors 14, 15, detection lever 18, step playback switch SW1, auto playback switch SW2, and recording storage switch SW.
3. Each signal from the saved screen playback switch SW4 is given. The CPU 34 controls writing and reading of video data based on input signals from the switches and the like, and causes the display lamps 16 and 17 to display the operating status of the apparatus.

The address signal generation circuit 35 is connected to the screen memory 32
Specify the memory address to which the video data should be written. The output of the image memory 32 is given to the monitor television 13 via a D/A converter 36.

Next, the operation of the above-described device will be explained.

Figure 3 is an operational flowchart of the device;
The figure is a timing diagram.

When the ball detectors 14 and 15 detect a ball placed at a predetermined position, the CPU 34 displays a predetermined display on the display lamps 16 and 17 to notify the operator that recording preparations are complete. Let me know. Then, when the operator presses the detection lever 18, recording is started (step a in FIG. 3).

As a result, a video signal is output from the video camera 12. The synchronization separation circuit 30 separates horizontal and vertical synchronization pulses from this video signal and supplies them to the counter 33. FIG. 4a shows the vertical sync pulses separated as described above. These synchronization pulses are individually given to the counter 33 and counted individually. Then, the count value of the vertical synchronization pulse is used to select and switch among the 32 memories of the image memory. Further, the counted value of the horizontal synchronizing pulse provides the write timing in each of the memories. Based on this count output, the address signal generation circuit 35 specifies the address of the image memory 32 into which the optical video signal is to be written.

When recording starts, the ball detectors 14 and 15
Based on the output signal, the CPU 34 determines whether or not the ball placed at the predetermined position has disappeared, that is, whether or not the ball has been hit (step b in FIG. 3).

If the ball still remains in the predetermined position, it is determined how many sides of video data will be input to the image memory 32. This determination is made based on the output of a counter that counts vertical synchronization pulses. In this embodiment, since the video data is recorded every two frames, it is determined whether the count output is a multiple of 3 (step c in Figure 3; n in the figure is a positive number). (denotes an integer).

If the count output is not a multiple of 3, the video data at that time is overwritten in the currently designated memory (step d in Figure 3).
That is, the video data of the image is written on top of the image 0 shown in FIG. 4d, and the video data of the image data is written from above it.

On the other hand, when the count output becomes a multiple of 3, the memory address is updated (step e in Figure 3).
The memory address is updated, as shown in FIG. 4c, by an address update signal output from the address signal generation circuit 35 to the image memory 32 at the same time as the vertical synchronization pulse is input.
Therefore, what initially remains in the image memory 32 is the video data of the image.

Then, the next image is written to the updated new memory (step f in FIG. 3).

By the way, in step b, when it is detected that the ball is missing, when the writing of the video data at that time is finished, the memory address is updated regardless of the count value of the counter 33 (step g in FIG. 3). ). This will be explained with reference to FIG. 4. As shown in FIG. 4b, the loss of the ball (the moment of impact) is detected while the image is being written. Then, an address update signal is output to the image memory 32 in synchronization with a vertical synchronization pulse that is subsequently input, and the memory address is updated. Therefore, the image at the moment of impact remains in the image memory 32.

When the memory address is updated in step g, the video data of the image shown in FIG. 4d is written into the next new memory (step h in FIG. 3).

When this writing is completed, an address update signal is output from the address signal generation circuit 35,
The memory address is updated (step i in FIG. 3). As a result, the image immediately after impact remains in the image memory. Simultaneously with the address update at this time, the counting output of the vertical synchronizing pulse of the counter 33 is reset, and a new count is started.

After impact, it is checked whether a predetermined number of images have been recorded in the image memory 32 (step j in FIG. 3). This is for recording the hollow-through after impact, and the number of frames (number of screens) to be recorded is set appropriately in advance. If the predetermined number of frames have not been recorded, the process returns to step b and the image data is recorded every two frames as described above. When recording of a predetermined number of frames is completed, recording ends.

In the description of the embodiment, it is assumed that the video data is recorded in the image memory every two frames, but it is also possible to thin out and record more video data. Even in such a case, the moment of impact is reliably recorded as described above.

Further, in the embodiment, the image data at the time of impact and immediately after the impact are configured to be left in the image memory, but it is also possible to leave either one of them.

Further, in the embodiments, a golf swing recording device has been described as an example, but it goes without saying that other recording devices such as a bat swing recording device may be used.

(Effects) As described above, the video recording device according to the present invention has
A predetermined number of frames of video data are thinned out and recorded in the image memory, and when a specific action such as the moment of impact is detected, the video data is recorded in the image memory.

Therefore, according to the present invention, it is possible to reliably record a specific instantaneous motion during a series of continuous motions.

Furthermore, according to the present invention, there is no need to increase the capacity of the image memory in order to record the instantaneous motion, so the apparatus can be configured with an image memory having a smaller capacity than conventional apparatuses.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an outline of a video recording device according to an embodiment of the present invention, FIG. 2 is an external perspective view of the device according to the embodiment, and FIG. 3 is an operation of the device shown in FIG. 1. The flowchart, FIG. 4, is an operation timing diagram of the apparatus shown in FIG. 12...Video camera, 32...Image memory, 33
...Counter, 34...CPU, 35...Address signal generation circuit.

Claims (1)

[Claims] 1 a video input device, an image memory capable of recording multiple screens of video data from the video input device,
The control circuit includes a control circuit for writing the video data into the image memory and a sensor for detecting whether a predetermined object is at a predetermined position, and the control circuit writes the video data for each predetermined number of images into the image memory. In addition to writing to the memory, if the sensor detects that the predetermined object is missing, the image data is configured to write at least one of the video data at that time and the video data immediately after that to the image memory. A video recording device characterized by: