KR20020094576A - Digital video recording retrieval method using compact information index - Google Patents

Abstract

PURPOSE: A method for searching DVR(Digital Video Recording) by using a simple information index is provided to more quickly search image data by date, time and minute, and improve the convenience of users by enabling users to select a recording time of an image to be generated with a mouse. CONSTITUTION: A method for searching DVR by using a simple information index includes the steps of receiving regeneration image selecting information including at least one among a regeneration start time, a storage method, and a camera number having recorded(501-503); searching the simple information index for extracting a location of a first image in a detail information index related at the regeneration start time(507); searching the detail information index corresponding to the extracted location for extracting image location of the first image in image data(509); searching image data corresponding to the location of the first image for reading the first image, and displaying the read first image to a user(511); searching a detail information index of the next location in order for extracting image location, searching the image data corresponding to the extracted image location, reading the next image, and displaying the image to the user(513-515).

Description

DVR search method using short information index {DIGITAL VIDEO RECORDING RETRIEVAL METHOD USING COMPACT INFORMATION INDEX}

The present invention relates to a DVR (Digital Video Recording) retrieval method using a short information index, and more particularly, to a playback time in minutes selected by a user using a short information index stored in minutes for information on an image. It relates to a DVR search method that can quickly search for the image corresponding to the.

DVR (Digital Video Recording) system converts analog signal, which is the image data input by surveillance camera, into digital signal, compresses and saves digital image into hard disk (HDD) such as personal computer (PC), if necessary or event. (Event) It is a system that can search and play back images by selecting date, time and camera.

DVR is the next generation surveillance system that replaces the existing surveillance system consisting of CCD camera, VCR, TAPE, etc. The DVR system is used in various applications in factories, offices, religious organizations, banks, securities companies, hospitals, apartment complexes, hotels and kindergartens.

Conventional analog video surveillance systems such as VCRs record and store necessary images on tape, but the DVR converts them into digital signals and stores them on a hard disk or DVD-RAM. It has many advantages.

Images stored on tape are easily degraded due to continuous recording and playback, but digitally stored image data has no worry about degradation. That is, the compressed image data can be stored semi-permanently in a hard disk or the like.

In addition, since most DVRs compress and store video data, they can store a very large amount of images compared to the amount of data stored on an analog tape.

In addition, there is an advantage that can be quickly retrieved data by easy operation. In addition, DVR has many advantages and is rapidly replacing the existing analog surveillance system.

In particular, in the DVR system, a plurality of cameras can be searched at the same time, and when a corresponding camera is designated by date, time, and minute, it can be searched immediately. In other words, the stored images can be searched by date, time, camera, or sensor event, so users can easily and quickly search for the desired image, compared to the method of rewinding the tape in the conventional analog method.

The conventional image retrieval method simply searches image data stored in a hard disk by date, time, and minute, and provides the retrieved image with image information such as recording date. That is, the image retrieval method in the conventional DVR system focuses on simply searching and displaying the image data stored in the hard disk by date, time, and minute to the user. There was not enough to make it possible.

Accordingly, an object of the present invention is to provide a DVR retrieval method capable of retrieving image data more quickly by date, time, and minute by using a brief information index. have.

In addition, an object of the present invention is to allow the user to select the recording time of the image to be reproduced by a simple mouse operation in minutes, so that the user can easily operate, the user can easily use the DVR search In providing a method.

In addition, an object of the present invention is to provide a DVR search method with increased user convenience by providing a user at a glance the information on the recording date, the storage method for the image to be reproduced by the user.

1 is a schematic block diagram of a DVR search system according to an embodiment of the present invention.

2 is a diagram illustrating a configuration of an image data file in which image data is stored in units of frames.

3 is a diagram showing a detailed information index storing information on each image stored in the image data according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a simplified information index that stores first image information and the like in minutes for performing a quick search according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a DVR search method using a brief information index according to an embodiment of the present invention.

6 is a screen of reproducing and displaying an image searched in units of minutes according to an exemplary embodiment of the present invention.

FIG. 7 is a screen for displaying an image retrieved in units of minutes and displayed in a panorama format according to an exemplary embodiment of the present invention. FIG.

FIG. 8 is a screen displaying a screen divided by reproducing an image searched in units of minutes according to an exemplary embodiment of the present invention. FIG.

9 is an enlarged screen of a part of an image searched in units of minutes according to an exemplary embodiment of the present invention.

FIG. 10 is an enlarged screen of an image searched on a minute basis according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: DVR search processing unit 140: image data storage unit

150: detailed information index storage 160: brief information index storage

200-1, ..., 110-n: image data file

300-1, ..., 100-N1: Detail Index

400-1, ..., 100-N1: Quick Index

In order to achieve the above objects, a step of receiving playback image selection information including at least one of a playback start time, a storage method, and a recorded camera number, in which a time at which an image is recorded is designated by a predetermined time unit, in order to achieve the above objects, a brief information index- Here, the short information index includes predetermined time unit information having a recording time of a first image of a predetermined time unit among images stored in the image data, a camera number used for recording, a storage method, and a position in a detailed information index. Extracting a position in the detailed information index with respect to the first image at the start time of the predetermined time unit by searching for-a detailed information index corresponding to the position in the extracted detailed information index, wherein the detail The information index includes each stored in the image data. Extracting an image position in the image data of the first image by searching for an unknown recording time, a camera number used for recording, a storage method, an image size, and an image position in the image data. Retrieving the first image by retrieving image data corresponding to a position in the image data of the first image, displaying the read first image to a user, and requesting the user to end playback Sequentially searching for the detailed information index of the next location to extract the image position in the image data, searching for the image data corresponding to the extracted image position, and reading the next image and displaying it to the user. A quick index of this A DVR search method, a corresponding system and a recording medium with a program that can perform such a method be found that the above method is provided.

In the DVR search method using the short information index according to the present invention, the recording date is extracted from the recording time of the first image of the predetermined time unit of the short information index, and the recording is divided into a predetermined color in a calendar display area on a display screen. The method may further include displaying a recording date displaying the date.

The displaying may include reproducing and displaying a panorama number on one screen sequentially by a predetermined number of images corresponding to the recorded camera number selected by the user and the start time of a predetermined time unit.

In the DVR search method using the short information index according to the present invention, the playback image information including the recording time, the camera number, and the storage method of the displayed image is displayed in a predetermined color from the predetermined time unit information of the short information index. The method may further include displaying the reproduced image information.

The storage method may include at least one of a sensor storage method for storing only when a motion is detected through a sensor, a date storage method for storing on a specified date, and a manual storage method for manually storing.

The predetermined time unit playback time can be easily selected in minutes by the recording time desired to be reproduced by the user's mouse operation in the time table displayed by dividing every hour into minutes of a predetermined length.

The image displaying step may display the image in at least one screen division method among 1, 4, 9, and 16. In addition, the image display step may be displayed by enlarging a specific portion of the image selected by the user. In addition, the image display step may be displayed by enlarging or reducing the image selected by the user using an image stretching technique.

Hereinafter, a preferred embodiment of a DVR search method using a brief information index according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a schematic block diagram of a DVR search system according to an embodiment of the present invention.

Referring to FIG. 1, the DVR search system includes a DVR search processor 100, an image data storage 140 connected to the DVR search processor 100, a detailed information index storage 150, and a brief information index storage 160. ), A display unit 180, a plurality of cameras 120-1,..., 120 -N, and a plurality of sensors 110-1,..., 110 -N.

The analog image data input to the plurality of surveillance cameras 120-1,..., 120 -N are converted into digital images and then compressed and stored in the image data storage 140. 140 may be a hard disk of a personal computer.

Alternatively, when an event such as a movement occurs, when the movement is detected by the sensors 110-1, ..., 110-N, recording is started by the cameras 120-1, ..., 120-N. As a result, the image is stored in the image data storage 140.

The DVR search processor 100 searches the image data storage 140 for an image corresponding to the image information selected by the user with reference to the brief information index storage 160 and the detailed information index storage 150 to display the display unit ( 170). The image information is information about a recording time, a camera number, or a storage method such as the year, month, date, minute, second, and millisecond of an image that the user wants to reproduce. The DVR search processing unit 100 may be, for example, a personal computer (PC). That is, an image search program may be executed in a personal computer to search for an image desired by the user and provide the image to the user.

The detailed information index storage unit 150 and the short information index storage unit 160 store the detailed information index and the short information index, respectively, which will be described later.

2 shows a configuration of an image data file in which image data is stored in units of frames.

2, the actual image data is stored in the image data file one frame at a time.

The size of one image data file is fixed to a predetermined size, and the size (resolution) of the image may be various. For example, the size of one image data file is 64MB, and the image size may be 352 * 240, 704 * 240, 704 * 480.

Since the image size of each frame is not fixed and the size of one image data file is fixed, the number of frames stored in one image data file is not constant. That is, N1 frames are stored in the image data file 1 (200-1), N2 frames are stored in the image data file 2 (200-2), and Nn frames are stored in the image data file n (200-n). Can be stored.

Images are stored one after another, and if the remaining capacity in one image data file is smaller than the next image size to be stored, they are sequentially stored in the next image data file. The image position 350-1, ..., 350-N1 in the image data file of the detailed information indexes 300-1, ..., 300-N1 is the position of the starting point where the image in the image data file is stored. Is stored.

Therefore, the image position in the image data file can be found immediately by referring to the detailed information indexes 300-1, ..., 300-N1 at the time of image search.

3 shows detailed information indexes 300-1, ..., 300-N1 storing information on each image stored in the image data according to an exemplary embodiment of the present invention.

Referring to FIG. 3, detailed information indexes 300-1, ..., 300-N1 include recording time information 310-1, ..., 310-N1 for each image stored in the image data. Camera number 320-1, ..., 320-N1, storage method 330-1, ..., 330-N1, image size (340-1, ..., 340-N1) and image position Information about (350-1, ..., 350-N1) is stored. The size of data stored in the detailed information indexes 300-1, ..., 300-N1 is determined to have a predetermined size, respectively.

The detailed information index storage unit 150 stores the detailed information index files in which the plurality of detailed information indexes 300-1, ..., 300-N1 are stored as many as the number of image data files, and for each detailed information index file. A header portion that records the total number of detailed information indexes stored in the corresponding detailed information index file is stored in the front of the detailed information index.

The detailed information index file stores information on each image, in particular, location information of image data in the image data file, so that the corresponding image data can be retrieved from the image data file. Each detailed information index file corresponds to an image data file, and the number of detailed information index files is equal to the number of image data files. That is, when there are five image data files, there are five detailed information index files. In addition, when N1 image frames are stored in the image data file 1, N1 detailed information indexes are also stored in the corresponding detailed information index file, and the recording time information of the image is recorded in each detailed information index. .

In the recording time information 310-1, ..., 310-N1, the time when the image was recorded is year, month, day of the week, date (day), hour, minute, second, and millisecond. Up to milli-seconds are recorded. The user can select a recording time in minutes (for example, 10:01) through the time table to search for and play back images recorded at the corresponding recording time. Details will be described later.

The camera numbers 320-1, ..., 320-N1 indicate the number of cameras used for recording of each image stored in the image data among the plurality of cameras used for video recording.

The recording method (330-1, ..., 330-N1) is a mode that allows the video captured by the camera to be stored at all times, a motion capture saving method to save only when a motion is detected, and a recording on a specified date. Date storage and manual storage.

The image sizes 340-1,..., 340 -N1 may be the horizontal size, the vertical size, and the total image size (resolution) multiplied by the horizontal and vertical sizes. For example, if the horizontal size is 352 bits and the vertical size is 240 bits, the total image size is stored as 352 * 240.

Image positions 350-1, ..., 350-N1 are positions of starting points in the image data file of each image sequentially stored in the image data file. The user may read an image to be searched from the image data using the image position.

4 is a simplified information index that stores first image information and the like in minutes for performing a quick search according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the brief information index 400 includes the number 410 of the first frames in a predetermined time unit (for example, minutes), the recording time 420 of the first frame, and the recording time 430 of the last frame. Information 440 is recorded for the first frame for each predetermined time (eg, minute).

Here, the predetermined time may be preferably made in minutes, but is not necessarily limited thereto, and may be modified in any number of 30 seconds, 2 minutes, 5 minutes, and the like.

The short information index 400 consists of one file. The short information index 400 reduces the plurality of detailed information index files corresponding to the plurality of image data files into minute information. Hereinafter, the predetermined time unit will be described as meaning a minute unit.

Since the image information is recorded in frame units in the detailed information indexes 300-1, ..., 300-N1, image information corresponding to the total number of images stored in the image data is recorded. On the other hand, an image is recorded in the short information index 400 in units of minutes. That is, only image information for the first image of the corresponding recording time (minutes) is recorded.

By using the short information index 400 which stores minute information, the search speed can be further increased by reducing the number of detailed information index files into one file. If an image is recorded at 30 frames per second, 30 * 60 images are saved per minute. Image information until the actual image is output by storing only the information about one image (the first image of the minute) in the short information index 400 and using it for retrieval while skipping every 30 * 60 images. Search can be faster.

The number 410 of the first frames per minute refers to the number of first frames (minutes included in one index file) stored in one short information index file.

In the recording time 420 of the first frame, the recording time of the first stored frame among the frames stored in the image data is recorded up to year, month, day of the week, date (day), hour, minute, second, and millisecond. In the recording time 430 of the last frame, the recording time of the last stored frame among the frames stored in the image data is recorded up to year, month, day of the week, date (day), hour, minute, second, and millisecond.

The information 440 (hereinafter also referred to as minute information) for the first frame for each minute includes the recording time (442-1, 442-2, ...) of the first frame in minutes, the camera used for recording. Number (444-1, 444-2, ...), storage method (446-1, 446-2, ...), position of the first frame in the detailed information index file (448-1, 448- 2, ...) is recorded.

For example, if image recording was from 14:00 to 18:00 on May 14, 2000, and the recording was interrupted for 30 minutes from 17:00 to 17:30 in the middle, the first minute The number 410 of frames is stored 150 (180 minutes to 30 minutes). In this case, 15: 00: 00 seconds on May 14, 2000 is recorded in the recording time 420 of the first frame, and 18: 00: 00 seconds on May 14, 2000, are recorded on the recording time 430 of the last frame. do. In this case, a total of 150 minute information is recorded in the information 400 of the first frame for each minute, and every minute (15:00, 15:01, ..., The information on the first recorded frame is recorded every 16:59, 17:31, 17:32, ..., 18:00.

In the minute information, the recording time is stored in hours and minutes in which the first frame is stored, and other camera numbers and storage methods are the same as already described in the detailed information index.

The position of the first frame (448-1, 448-2, ...) in the detail index file contains the serial number of the number of times in the detail index file that the first frame of each minute is included. it means.

5 is a flowchart illustrating a DVR search method using a brief information index according to an embodiment of the present invention. 6 illustrates a screen on which a searched image is reproduced and displayed in units of minutes according to an exemplary embodiment of the present invention.

Referring to FIG. 5, first, when a DVR search program is executed as an initialization process, an image is recorded by reading a recording time 420 of the first frame and / or a recording time 430 of the last frame of the brief information index 400. The extracted date is extracted, and the recorded dates are displayed in color on the calendar display area 620 (see FIG. 6) on the display screen (step 501). Referring to FIG. 6, in the calendar display area 620, 14 days are displayed in color so that a user may know at a glance that 14 days are recording days.

The minute information of the short information index 400 is read and the recording time is displayed on the screen up to year, month, day, minute, and second (step 503). Referring to FIG. 6, 17:38:00 seconds on May 14, 2000 is displayed on the screen (630 and FIG. 6). Cameras used for recording are displayed in the time table, and storage methods can also be displayed in the time table by color coding for easy identification by users. Referring to FIG. 6, a manual storage method 640-1 for manually storing, a date storing method 640-2 for storing on a specified date, and a storage method for storing only when the sensor is operated 640- 3), a display of a storage method such as a motion capture storage method 640-4 to store only when a motion is detected may be performed.

Next, the user selects, in minutes, the playback start time that the user wants to play back in the time table 610 (see FIG. 6). Referring to FIG. 6, the user moves the vertical line 612 for selecting the minute playback time in the time table 610 to point to 5:38. In this way, the user can easily find an image of a specific time on a date to be viewed with a simple mouse operation.

The short information index 400 is searched to extract a position in the detailed information index file for the first image of the minute playback start time selected by the user (step 507).

The detailed information index is searched using the location in the extracted detailed information index file to read the first detailed information index corresponding to the selected minute reproduction start time (step 509).

The image position in the image data of the first image is extracted from the first detailed information index corresponding to the selected minute unit reproduction start time, and the unit of reproduction is performed by referring to the image position information in the extracted image data. The first frame of the start time is read from the image data file and displayed to the user (step 511).

The image position in the image data is extracted by sequentially searching the detailed information index of the next position until the reproduction end request of the user, and the next image is read by searching the image data corresponding to the extracted image position. Display to the user (step 513, step 515).

7 illustrates a screen in which a searched image is reproduced in units of minutes and displayed in a panorama format according to an exemplary embodiment of the present invention.

Referring to FIG. 7, a user may view and play an image recorded by a camera selected by a user at a time in a panorama format up to nine frames in sequence according to a recording time.

In addition, the user can view images recorded by multiple cameras at a glance (see FIG. 4) in various screen division methods such as 1, 4, 9, and 16 (see FIG. 4), or enlarge part of the image (see FIG. 9). ), The image may be enlarged or reduced (see FIG. 10).

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

The DVR search method using the short information index according to the present invention has an effect of searching image data more quickly by date, time, and minute by using the short information index.

In addition, the present invention allows the user to select the recording time of the image to be reproduced by a simple mouse operation in a predetermined time unit (for example, minutes), so that the user can easily operate, and the user can easily use User convenience is increased.

In addition, the present invention has an effect of increasing user convenience by providing the user with information on the recording date and storage method for the image to be reproduced by the user at a glance.

Claims (11)

In the DVR search method, Receiving playback image selection information including at least one of a playback start time, a storage method, and a recorded camera number, which designate a time when an image is recorded in a predetermined time unit from a user; Short information index-Here, the short information index is a predetermined time unit having a recording time of the first image of a predetermined time unit among the images stored in the image data, a camera number used for recording, a storage method, and a position in a detailed information index. Including information to extract a position in the detail information index for the first image at the start time of the predetermined time unit; A detailed information index corresponding to a position in the extracted detailed information index, wherein the detailed information index includes a recording time of each image stored in the image data, a camera number used for recording, a storage method, an image size, and the image. Search for an image position in the data, and extract an image position in the image data of the first image; Retrieving the first image by retrieving image data corresponding to a position in the image data of the first image; Displaying the first image read to the user; And The image position in the image data is extracted by sequentially searching the detailed information index of the next position until the end of the reproduction request of the user, and the next image is read by searching the image data corresponding to the extracted image position. Steps to display DVR search method using a brief information index comprising a. The method of claim 1, And a recording date display step of extracting a recording date from the recording time of the first image of the predetermined time unit of the short information index, and displaying the recording date by dividing the recording date in a calendar display area on a display screen. DVR search method using a brief information index characterized in that. The method of claim 1, The displaying step DVR using the simplified information index, characterized in that the user corresponding to the recorded camera number and the start time of the predetermined time unit playback the image corresponding to the recording time to display a predetermined number sequentially on a single screen in a panorama format Search method. The method of claim 1, And displaying the reproduced image information including the recording time, the camera number, and the storage method of the displayed image by dividing the predetermined image by the predetermined time unit information of the brief information index into a predetermined color. DVR search method using a brief information index. The method of claim 1, The storage method may include at least one of a sensor storage method for storing a motion only when a motion is detected through a sensor, a date storage method for storing on a specified date, and a manual storage method for manually storing. DVR search method using. The method of claim 1, The predetermined time unit play time is The DVR search method using a brief information index, characterized in that the recording time desired to be played back is simply selected by the user's mouse operation in a time table displayed by dividing the hour into minutes of a predetermined length. . The method of claim 1, The image display step The method of claim 1, wherein the image is displayed in at least one screen division method among 1, 4, 9, and 16. The method of claim 1, The image display step DVR search method using a simplified information index, characterized in that for expanding and displaying a particular portion of the image selected by the user. The method of claim 1, The image display step A method of searching for a DVR using a brief information index, wherein the image selected by the user is enlarged or reduced by using an image stretching technique. Memory in which the program is stored; A processor coupled to the memory to execute the program Including but not limited to: The processor extracts the recording date from the recording time of the first image of the short information index iii) by the program and displays the recording date by dividing the recording date into a predetermined color in the calendar display area on the display screen, ii. A step of receiving, from a user, playback image selection information including at least one of a playback start time, a storage method, and a recorded camera number for a predetermined time unit, which designates a recording time of an image in a predetermined time unit; iii) a predetermined information index. Displaying the reproduced image information including the recording time, the camera number, and the storage method of the displayed image from a time unit information by displaying the reproduced image information in a predetermined color; iv) a simplified information index, wherein the simplified information index In the image data Recording time of the first image in a predetermined time unit among the stored images, including camera number used for recording, storage method, and predetermined time unit information having a position in a detailed information index. Extracting a position in the detail information index for the first image in v, v) a detail information index corresponding to a position in the extracted detail information index, wherein the detail information index is stored in the image data, respectively; Including the recording time of the image, the camera number used for recording, the storage method, the image size and the image position in the image data to retrieve the image position in the image data of the first image. Step, vi) at a position within the image data of the first image. Retrieving corresponding image data and reading the first image, vii) displaying the first image read to the user, viii) sequentially indexing the detailed information of the next location until the user requests to end playback And extracting the image position in the image data, searching for image data corresponding to the extracted image position, reading the next image, and displaying the next image to the user. In the recording medium that can be read by the digital processing device is implemented programmatically implemented by the digital processing device to perform the DVR search method using the short information index, DVR search method using the short information index, A recording date display step of extracting a recording date from the recording time of the first image of the short information index and displaying the recording date by dividing the recording date in a calendar display area on a display screen by a predetermined color; Receiving playback image selection information including at least one of a playback start time, a storage method, and a recorded camera number, the predetermined time unit specifying a recording time of an image in a predetermined time unit from a user; A reproduction image information display step of displaying reproduction image information including a recording time, a camera number, and a storage method of the displayed image in a predetermined color from a predetermined time unit information of a brief information index; Short information index-Here, the short information index is a predetermined time unit having a recording time of the first image of a predetermined time unit among the images stored in the image data, a camera number used for recording, a storage method, and a position in a detailed information index. Including information to extract a position in the detail information index for the first image at the start time of the predetermined time unit; A detailed information index corresponding to a position in the extracted detailed information index, wherein the detailed information index includes a recording time of each image stored in the image data, a camera number used for recording, a storage method, an image size, and the image. Search for an image position in the data, and extract an image position in the image data of the first image; Retrieving the first image by retrieving image data corresponding to a position in the image data of the first image; Displaying the first image read to the user; And The image position in the image data is extracted by sequentially searching the detailed information index of the next position until the end of the reproduction request of the user, and the next image is read by searching the image data corresponding to the extracted image position. Steps to display Recording medium comprising a.