JPH0687344B2 - Image matching equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image filing apparatus, and particularly to prevent deterioration of a video tape or the like as a re-recording medium for recording and reproducing digitized image data. The present invention relates to an image filing device that controls a copy operation.

[Conventional technology]

Conventionally, since this type of image filing apparatus has a large amount of information of digitized image data, it is easy to run out of capacity in a magnetic disk device or the like used as a peripheral device of a computer, and digital recording is generally performed. In many cases, a video tape recorder (hereinafter referred to as a digital VTR) to be used is used as image data recording / reproducing means and a video tape is used as a recording medium for filing. However, even if a digital VTR is used, the video tape and the head are in contact with each other at high speed for recording and reproducing, and if a large number of searches are performed, the surface of the tape is roughened and the data error rate deteriorates.

[Problems to be solved by the invention]

The conventional image filing apparatus described above constantly updates the file by means of outputting an alarm to notify a person when the data error rate becomes worse than a specified value, making a copy on a new tape, and discarding the old tape. The way is going. At this time, there is a problem that there is a complicated work of making a copy, the cost of purchasing a new tape is high, and there is a drawback that the same work is required even if the tape is partially deteriorated over its entire length.

The object of the present invention is to eliminate the above-mentioned drawbacks and prevent the multiple searches for a specific tape position by exchanging the positions on the tape of images that have been searched a lot and images that have been searched a lot, with the number of searches for all images as a parameter. An object of the present invention is to provide an image filing device designed to do so.

[Means for solving problems]

The apparatus of the present invention records and reproduces first image data recording and reproducing means for recording and reproducing digitized image data and digital image data reproduced by the first image data recording and reproducing means. Second image data recording / reproducing means, total retrieval number detecting / recording means for detecting and storing the total retrieval number of an arbitrary position of the recording medium used in the first image data recording / reproducing means, and information on the total retrieval number. In response to this, the N images of the upper N highest search addresses for the recording medium and the N images of the lower N lowest search addresses for the recording medium are exchanged and reproduced by the first image data recording / reproducing means. By recording, the copy operation between the first and second image data recording / reproducing means is controlled so as to suppress the concentration of searches on a specific address of the recording medium. With reference to EXAMPLES now to the drawings and has a configuration in which a copy operation control means for describing the present invention in detail.

FIG. 1 is a block diagram showing an embodiment of the present invention. The embodiment shown in FIG. 1 has a first digital VTR 1 as a first image data recording / reproducing means, a second digital VTR 2 as a second image data recording / reproducing means, and a first digital VTR.
Total search circuit detection recorder that detects and stores the total number of searches at an arbitrary position on the video tape as the recording medium used in 1.
In addition to the copy operation controller 4 as a copy operation control means for controlling the copy operation between the first and second digital VTRs by receiving the information S7 regarding the total search frequency detected by the total search frequency detection recorder 3, the television camera 5 A digital processor 6, a digital processor 7, an image monitor 8, a digital switch 9, a display 11, and a floppy disk 12.

At the time of image filing, the image signal S4 taken by the television camera 5 is converted into digital image data S1 by the digital processor 6 including an A / D converter, and is supplied to the first digital VTR 1 via the digital switcher 9. At this time, the copy operation controller 4 supplies the control command S6 to the first digital VTR 1 to specify the tape address to be registered,
A recording operation is started, and an image is recorded at a predetermined address on the tape. In this way, a large number of images are registered on a specific tape address. Similarly, in the search of the registered image, the tape command to be searched is designated by the control command S6 output from the copy operation controller 4 to the first digital VTR 1, and the reproduction operation is started. The image is reproduced by reading from the address. The reproduced digital image data S2 is converted into an analog image signal S5 by the digital processor 7 including a D / A converter and displayed on the image monitor 8.

When controlling the above-described image search, the control command S6 also includes information such as a search address, and the total search count detection storage unit 3 detects which address of the video tape has been searched and how many times. This number of searches is sequentially stored in the floppy disk 12 according to the information S7 from the total number of searches detection memory 3 and backed up even when the power is off. The number of searches can be monitored on the display 11 if necessary.

The copy operation controller 4 copies N images of the most searched address to the second digital VTR2 by the digital image data S2 based on the thus obtained tape address and the data of the number of searches. Next, N images of the minimum search address are similarly copied. The control in this case is
This is performed by the control command S6 output to the first and second digital VTRs. After that, the copy operation controller 4 outputs the control command S6 to control the switching of the digital switcher 9, reproduces the second digital VTR2, and copies the copied digital image data S3 to the first digital switcher 9 via the digital switcher 9. It sends it to the digital VTR1, exchanges the maximum and minimum search addresses, and recopy.

FIG. 2A is a search frequency distribution chart showing an example of the search frequency distribution. The horizontal axis represents tape addresses 1 to 22, and the vertical axis represents the number of searches. In the distribution shown in FIG. 2 (a), the tape addresses 7, 13, 6 are searched many times, and it can be determined that an image having a high use frequency, that is, a high search frequency is registered therein. Further, it can be determined that the images of which the number of searches is small and the use frequency (search frequency) is low are registered at the addresses 1, 5, and 9. Based on this judgment, addresses 7 and 1,
When the addresses 13 and 5 and the addresses 6 and 9 are exchanged and the fractional distribution of the number of searches is examined after 10 days, it is expected that the result will be as shown in FIG. 2 (b). FIG. 2B is a distribution chart of the number of times of retrieval after elapse of time in FIG. This is based on the prediction that an image that is frequently used will not be used less frequently in a short period of time as described above. or,
The same applies to images that are rarely used. Therefore, there is a rational basis for being as shown in Fig. 2 (b). Also, the broken line in FIG. 2 (b) is the frequency distribution that can occur without address replacement, and the difference between the minimum and maximum search counts only widens.

An image having a certain purpose is searched for a large number of times at a certain time, and after that, it is hardly searched, but the present invention is also characterized in that the number of searches is naturally averaged over time, and there is no disadvantage. Absent. The same applies when the contents of the image are changed.

〔The invention's effect〕

As described above, according to the present invention, an image obtained from a position having a large number of searches and an image obtained from a small position are searched based on the total number of searches of an arbitrary position of a recording medium such as a video tape in the image data recording / reproducing means. By providing a means for exchanging each other and re-recording, it is possible to prevent concentration of search on a specific address of the recording medium, maintain average search frequency over the entire length of the recording medium, and significantly improve durability of the recording medium. There is an effect that an image filing device can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 (a).
Is a search frequency distribution chart showing an example of the search frequency distribution, and FIG. 2 (b) is a post-aging search frequency distribution chart of FIG. 2 (a) showing the state of image replacement. 1 ... 1st digital VTR, 2 ... 2nd digital VTR
TR, 3 ... Total search count detection memory, 4 ... Copy operation controller, 5 ... TV camera, 6,7 ... Digital processor, 8 ... Image monitor, 9 ... Digital switcher, 11 ... Display, 12 ... Floppy disk.

Claims (1)

[Claims] 1. A first image data recording / reproducing means for recording and reproducing digitized image data, and a first image data recording / reproducing means for recording and reproducing the digital image data reproduced by the first image data recording / reproducing means. The image data recording / reproducing means 2 and the total retrieval number detecting / storing means for detecting and storing the total retrieval number of an arbitrary position of the recording medium used in the first image data recording / reproducing means, and the information on the total retrieval number. Receiving and re-recording by the first image data recording / reproducing means by replacing the N images of the upper N highest search addresses with respect to the storage medium and the N images of the lower N lowest search addresses with respect to the recording medium. By doing so, the copy operation between the first and second image data recording / reproducing means is controlled so as to suppress the concentration of searches for a specific address on the recording medium. Image filing apparatus characterized by comprising a copy operation control means.