JP5022581B2 - Image transmission system and image transmission method - Google Patents

Description

  The present invention relates to an image transmission system and an image transmission method.

  Background Art An image transmission system including a plurality of transmission units including a monitoring camera and a reception unit that is connected to the transmission unit and acquires imaging data of the monitoring camera has been widely spread due to security needs.

In such an image transmission system, it is possible to improve the monitoring accuracy when an abnormality occurs, such as by providing a higher-definition image than usual when an abnormality such as a suspicious person's intrusion occurs, so that the suspicious person can be accurately identified. Various proposals have been made. For example, an image transmission system (e.g., having a moving image encoding unit and a storage unit in a surveillance camera, normally transmitting moving image encoded data, and transmitting high-definition image data stored in advance together with the encoded moving image data upon request And a video transmission system that includes both a still image encoding unit and a moving image encoding unit in a surveillance camera, and encodes a still image with a lower temporal resolution and a higher spatial resolution than a moving image (for example, Patent Reference 2).
Japanese Patent Laying-Open No. 2003-284044 (pages 5 to 6, FIG. 1) Japanese Patent Laid-Open No. 2001-189932 (pages 5 to 10 and FIG. 1)

  However, in the image transmission system disclosed in Patent Document 1, since the high-definition image is an original image that has not been subjected to compression processing, the compression rate for moving image encoding must be set to be significantly high in consideration of the load on the transmission path. In other words, there was a restriction that the resolution of moving images was lowered. On the other hand, in the image transmission system disclosed in Patent Document 2, storage of still image encoded data is started when a change occurs in the monitoring area or when the operator operates, that is, after an abnormality occurs. There was a problem that previous high-definition images could not be acquired. This is because when an abnormality such as suspicious person intrusion occurs, important information for identifying the suspicious person is often included in the image before the abnormality is recognized.

  The present invention provides an image transmission system capable of suppressing deterioration in image quality of moving image encoded data transmitted simultaneously with still image encoded data without increasing the load on the transmission path, and acquiring high-definition still images before and after the occurrence of an abnormality, and An object is to provide an image transmission method.

The image transmission system of the present invention includes an imaging unit that captures an image of each subject, an abnormality detection unit that detects an abnormality in the imaging region and generates alarm information, and temporal resolution for the image data generated by the imaging unit. The moving image input control means for controlling the image size, the moving image encoding means for generating the moving image encoded data by performing the moving image encoding of the image data controlled by the moving image input control means, and the imaging means Still image input control means for controlling temporal resolution of the captured image data, and still image encoding for the image data controlled by the still image input control means to generate still image encoded data Encoding means; storage means for storing the still image encoded data; and outputting the stored still image encoded data based on the alarm information; and the moving image encoded data. Transmitting means for transmitting the still image encoded data, the alarm information, and a camera ID assigned for identification of the imaging means to a transmission path, and receiving means for receiving information transmitted from the receiving unit; A plurality of transmitting units, receiving unit for receiving the moving image encoded data, the still image encoded data, the alarm information, and the camera ID transmitted from the transmitting unit of the transmitting unit, and the moving image encoding Video decoding means for decoding data and generating decoded video data, still picture decoding means for decoding still picture encoded data and generating still picture decoded data, moving picture decoded data and still picture decoding Display means for displaying data based on the alarm information and the camera ID; still picture request information generating means for generating still picture request information; and A transmission unit that transmits the alarm information to another transmission unit different from the transmission unit that transmitted the alarm information, and the moving image input control unit includes: The time resolution and image size of image data are controlled based on the alarm information and the still image request information, and the moving image encoding means performs moving image encoding based on the alarm information and the still image request information, The still image encoding means performs still image encoding so as to have a lower compression and a higher spatial resolution than the moving image encoded data, and the moving image input control means of the other transmitter is transmitted from the receiver The image size is reduced based on the alarm information. According to this configuration, high-definition still image encoded data from an arbitrary camera designated by the operator can be provided from the camera to the receiving unit even when detection is not performed by the abnormality detection unit of the transmission unit. In this case, high-definition still image encoded data before the designated time can also be acquired. Furthermore, since the states of a plurality of transmission units in the system can be mutually grasped, the transmission unit can perform resolution conversion processing and then transmit to the reception unit, and the processing load on the reception unit side can be reduced.

  In the image transmission system of the present invention, the transmission unit includes an image processing unit that cuts out an arbitrary region of the image and performs an enlargement process, and the reception unit is displayed on the display unit by an operation of an operator. The receiving unit includes an enlargement area designating unit that generates enlargement request area information for instructing an enlargement of an arbitrary area with respect to an image, and the abnormality detecting unit detects an abnormality in the imaging area and generates abnormal area information. The transmission means transmits the expansion request area information to the transmission section, the reception section of the transmission section receives the expansion request area information, and the image processing means transmits the abnormal area information and the expansion request area information. Based on the above, an abnormal region is cut out from the captured image and enlarged. According to this configuration, since the imaging target area where the abnormality has occurred and the operator's designated area are cut out and enlarged, and encoded and transmitted, the detailed image information is transmitted without increasing the load on the transmission path. It can be provided from the camera to the receiver.

  Further, in the image transmission system of the present invention, the transmission unit performs still image decoding data on the still image encoded data stored in the storage unit after a lapse of an arbitrary time, and generates still image decoded data. And re-encoding means for performing encoding processing on the still image decoded data at a higher compression rate than at the time of storage, wherein the storage means stores the still image encoded data subjected to the re-encoding processing. Accumulating and erasing the still image encoded image of the frame stored first. According to this configuration, it is possible to store image data for a longer time by compressing still image encoded data that has passed for a predetermined time after accumulation at a higher compression rate. Therefore, a high-definition still image can be confirmed for a long time from the present time.

  In the image transmission system of the present invention, the transmission unit performs a decoding process on the still image encoded data stored in the storage unit, and generates still image decoded data; and A resolution conversion unit that performs image size reduction processing on the still image decoded data after elapse of an arbitrary time; and a re-encoding unit that performs encoding processing on the image data output from the resolution conversion unit. The frame-thinned still image encoded data after an arbitrary time is thinned at an arbitrary interval, and the re-encoded reduced still image encoded data is accumulated, and the still image code of the frame stored first is stored. It is characterized in that the digitized image is erased. According to this configuration, it is possible to store image data for a longer time by reducing the image size of still image encoded data that has passed a predetermined time after accumulation. Therefore, a high-definition still image can be confirmed for a long time from the present time.

  According to the present invention, image quality degradation of moving image encoded data transmitted simultaneously with still image encoded data is suppressed, and still image encoded data before the occurrence of an abnormality is also transmitted when an abnormality occurs, increasing the load on the transmission path. It is possible to provide high-definition images before and after the occurrence of an abnormality without causing them to occur.

  FIG. 1 is a diagram showing a system configuration of an image transmission system according to an embodiment of the present invention. The image transmission system includes a plurality of transmission units 10 including a camera as an imaging unit and a reception unit 11 connected to them. In the following embodiment, an image transmission system having four transmission units. Will be described as an example.

  FIG. 2 is a diagram showing an internal configuration of the transmission unit and the reception unit of the image transmission system according to Embodiment 1 of the present invention. The transmission unit 10 mainly includes an imaging unit 101, a still image input control unit 102, a moving image input control unit 103, an abnormality detection unit 104, a still image encoding unit 105, a moving image encoding unit 106, a storage unit 107, and a transmission unit 108. , Etc. The receiving unit 11 mainly includes the receiving unit 111, the moving image decoding units 112, 113, 114, and 115 corresponding to the number of transmitting units to be connected, the still image decoding unit 116, and the display unit 117. Resolution conversion means 118, 119, 120, 121, etc. corresponding to the conversion means.

  First, the imaging unit 101 of the transmission unit 10 includes an imaging device such as a CCD or C-MOS sensor, an A / D converter that converts an image input from the imaging device into a digital signal, and the like, and generates imaging data of the subject. To do. The still image input control unit 102 performs temporal resolution control by thinning out an input image from the imaging unit 101 at arbitrary intervals. The moving image input control unit 103 controls time resolution and image size for the input image from the imaging unit 101. For example, in normal times, the resolution is converted so that the time resolution is not changed and the image size is half that of the input image, and when the alarm information is input, the time resolution is half that of the input. The frame conversion is performed so that the image size is ¼ of the input image.

  The abnormality detection unit 104 detects an abnormality in the imaging area and generates alarm information. Here, even if the abnormality detection method is a method based on an image taken by an imaging means (detection using a known image recognition technology, etc.), it is physically detected from an image other than an image such as an infrared sensor or an acoustic sensor. You may use the means to do. The still image encoding unit 105 compresses and encodes the image whose time resolution is controlled by the still image input control unit 102 as a still image, generates still image encoded data, and outputs the data to the transmission unit 108.

  The moving image encoding unit 106 compresses and encodes the image data controlled by the moving image input control unit 103 as a moving image, generates moving image encoded data, and outputs it to the transmission unit 108. The storage unit 107 stores the still image encoded data generated by the still image encoding unit 105 and the like. Here, the time resolution of the image set by the still image input control means 102 is set to be lower than the time resolution of the image data controlled by the moving image input control means 103. The encoding compression rate in the still image encoding unit 105 is set to be lower than the encoding compression rate in the moving image encoding unit 106.

  The plurality of transmission units 10 of the image transmission system are assigned camera IDs for camera identification, respectively, and the transmission unit 108 is generated by the alarm information generated by the abnormality detection unit 104 and the still image encoding unit 105. The still image encoded data, the moving image encoded data generated by the moving image encoding means 106, the camera ID, and the like are transmitted to the receiving unit 11 via the transmission path.

  Next, the reception unit 111 of the reception unit 11 receives alarm information, still image encoded data, moving image encoded data, camera ID, and the like transmitted from the transmission unit 108 of the transmission unit 10. The moving picture decoding means 112, 113, 114, and 115 decode the moving picture encoded data from each transmission unit received by the receiving means 111. Since there are four transmission units connected to the reception unit, four moving image encoding units are formed in the reception unit 11 corresponding to each transmission unit. In the figure, one of the four transmitters is shown as a representative.

  The still image decoding unit 116 decodes the still image encoded data received by the receiving unit 111. The resolution conversion units 118, 119, 120, and 121 perform a reduction process on the decoded video data as necessary. The display unit 117 displays the moving image decoded image processed by the resolution conversion units 118, 119, 120, and 121, and displays the still image decoded image processed by the still image decoding unit 116 as necessary.

  Next, an operation example when generating alarm information will be described. For example, it is assumed that the imaging unit 101 is an image sensor with 1280 × 960 pixels. In the still image input control means 102, the temporal resolution of the image data is thinned out to 1 fps, and the still image encoding means 105 performs 1/6 compression on the image data of 1280 × 960. In the moving image input control means 103, the image data is subjected to resolution conversion to 720 × 480 pixels, and the moving image encoding means 106 performs moving image encoding at a normal time resolution of 30 fps and a bit rate of 3 Mbps.

  In the receiving unit 11, normally, the resolution conversion means 118, 119, 120, 121 does not change the image size, and the display means 117 has four types decoded by the moving picture decoding means 112, 113, 114, 115. Is displayed in real time. FIG. 3 is a schematic diagram illustrating a screen display example in the display unit of the receiving unit. Normally, a screen display as shown in FIG.

  Here, among the four cameras (transmission unit) of the image transmission system, when a change occurs in the shooting target area of the camera A and the abnormality detection unit 104 of the transmission unit generates alarm information, the moving image input control unit 103 of the transmission unit. Receives alarm information, thins out the temporal resolution to 15 fps, and converts the resolution to 360 × 240 pixels, which is half the normal size. Since the still image encoded data is compressed by 1/6 at 1 fps, when the input image is converted into the 4: 2: 0 format, the bit rate is about 2.4 Mbps. In order not to increase the load on the 3 Mbps transmission line in the normal state, the moving image encoding means 106 performs moving image encoding at a bit rate of 0.6 Mbps. When the alarm information is input, the storage unit 107 reads out still image encoded data that is temporally retroactive from the time of occurrence of the alarm by an arbitrary frame, and sends it to the transmission unit 108. The transmission means 108 transmits still image encoded data between transmissions of moving image encoded data.

  Assuming that the resolution conversion means corresponding to the cameras B, C, and D of the reception unit 11 are 119, 120, and 121, the video decoding data received by these resolution conversion means is resolution-converted to 360 × 240. Therefore, as shown in FIG. 3B, the display means 117 displays the moving picture decoded image in real time in a smaller area than the normal area, and displays the still picture decoded image decoded by the still picture decoding means 116 in the center. To do. At this time, based on the camera ID, a frame may be added to the moving image of the camera that transmitted the alarm information, and a display that makes it easy to visually recognize which camera the alarm image (still image) is from may be performed. . Regarding the compression rate of still image and moving image encoding, for example, 1/6 in the case of JPEG can be said to be a considerably high image quality. The compression rate may be adjusted to increase the temporal resolution of still images or increase the bit rate of moving image encoding.

  In the transmission of high-definition images at the time of alarm, the data amount of the original image is about 15 Mbit in the above example, so if it is transmitted at 3 Mbps, it will be one image per 5 seconds. One transmission is possible.

  As described above, when an abnormality occurs, the time resolution of moving image encoding, the image size is reduced, and the still image encoded data stored in advance in the transmission unit is transmitted, without increasing the load on the transmission path, High-definition still images before and after the occurrence of an abnormality can be provided.

  FIG. 4 is a diagram illustrating an internal configuration of a transmission unit and a reception unit of the image transmission system according to Embodiment 2 of the present invention. Compared to the first embodiment, a receiving unit 201 is added to the transmitting unit 20, a still image requesting unit 211 and a transmitting unit 212 are added to the receiving unit 21, and a resolution converting unit is deleted. In the figure, one of the four transmitters is shown as a representative.

  In the image transmission system according to the present embodiment, a transmission request for a high-definition still image can be made to an arbitrary transmission unit from the reception unit side by an operator's operation. In the receiving unit 21, when the operator who is monitoring the display unit 117 recognizes an abnormality with respect to an image captured by an arbitrary camera (transmitting unit), the operator uses a still image request unit such as a button or a keyboard at hand. 211 is operated. The still image request unit 211 outputs a still image request signal and a camera ID for requesting output of a still image, and is transmitted from the transmission unit 212 to the reception unit 201 of the transmission unit 20 via the transmission path.

  The receiving unit 201 of each transmitting unit receives the still image request signal transmitted from the receiving unit 21 and the camera ID of the still image request. The moving image input control unit 103 controls the time resolution and the image size of the image data based on the alarm information generated by the abnormality detection unit 104 and the still image request signal acquired by the reception unit 201. For example, even when alarm information is not output from the abnormality detection unit 104, if a still image request signal is input, it is determined that still image encoded data is transmitted from an arbitrary transmission unit (camera) of the image transmission system. can do. Therefore, the image size is reduced on the transmission unit side in order to display still images and a plurality of moving images on the display unit 117 of the reception unit 21. If the received camera ID of the still image request matches, still image encoded data is transmitted, so that the time resolution is set low by the moving image input control unit 103 or the compression rate is set by the moving image encoding unit 106. The storage unit 107 outputs the stored still image encoded data to the transmission unit 108.

  Note that the transmission unit 212 of the reception unit 21 can transmit the alarm information transmitted from the arbitrary transmission unit 20 of the image transmission system to the other transmission units. The image size can be reduced.

  As described above, a high-definition still image is acquired from an arbitrary transmission unit (camera) by an operator's operation even when the abnormality detection unit of the transmission unit has not detected by making a transmission request for still image encoded data. can do. In addition, since the states of a plurality of transmission units in the system can be mutually grasped, the transmission unit can perform resolution conversion processing and then transmit to the reception unit, and the processing load on the reception unit side can be reduced.

  FIG. 5 is a diagram illustrating an internal configuration of a transmission unit and a reception unit of the image transmission system according to Embodiment 3 of the present invention. Compared with the second embodiment, an image processing unit 301 is added to the transmission unit 30, and an enlarged area designation unit 311 is added to the reception unit 31 instead of the still image request unit 211. In the figure, one of the four transmitters is shown as a representative.

  In the image transmission system according to the present embodiment, an instruction to cut out and enlarge an area to be imaged can be given from the receiving unit side to an arbitrary transmitting unit by an operator's operation. In the receiving unit 31, when the operator who monitors the display unit 117 recognizes an abnormality with respect to an image captured by an arbitrary camera (transmitting unit), the operator enlarges an area such as a button, keyboard, or mouse at hand. The designation means 311 is operated. The enlargement area designating unit 311 outputs enlargement area information such as coordinate data and a camera ID for making an enlargement request, and is transmitted from the transmission unit 212 to the reception unit 201 of the transmission unit 30 via the transmission path.

  The receiving unit 201 of each transmitting unit receives the enlargement area information transmitted from the receiving unit 31 and the camera ID of the enlargement request. The image processing means 301 acquires the enlargement area information and the enlargement request camera ID, and cuts out and enlarges the area specified by the enlargement area information when the enlargement request camera ID matches. The moving image input control unit 103 and the moving image encoding unit 106 control the temporal resolution, image size, and compression rate of the image data based on the alarm information generated by the abnormality detection unit 104. For example, the abnormality detection unit Even when the alarm information is not output from 104, if the enlarged area information is input, it can be determined that the still image encoded data is transmitted from an arbitrary transmission unit (camera) of the image transmission system. Therefore, the image size is reduced on the transmission unit side in order to display still images and a plurality of moving images on the display unit 117 of the reception unit 31. If the received enlargement request camera IDs match, still image encoded data is transmitted. Therefore, the moving image input control means 103 sets the time resolution low, or the moving image encoding means 106 increases the compression rate. Thus, the code amount of the moving image encoding is reduced, and the storage unit 107 outputs the stored still image encoded data to the transmission unit 108.

  Note that the transmission means 212 of the reception unit 31 can transmit the alarm information transmitted from the arbitrary transmission unit 30 of the image transmission system and acquired to other transmission units. The image size can be reduced.

  As described above, by making an enlargement display request by designating an arbitrary region, it is possible to acquire a detailed image of a region where an abnormality has occurred or an image region where an operator wants to confirm details. In addition, since the states of a plurality of transmission units in the system can be mutually grasped, the transmission unit can perform resolution conversion processing and then transmit to the reception unit, and the processing load on the reception unit side can be reduced.

  FIG. 6 is a diagram illustrating an internal configuration of the transmission unit of the image transmission system according to the fourth embodiment of the present invention. Compared to the first embodiment, a difference is that a still image decoding unit 401 and a still image re-encoding unit 402 are added to the transmission unit 40.

  The storage unit 107 sequentially outputs still image encoded data for which a predetermined time has elapsed after storage to the still image decoding unit 401. The still image decoding unit 401 decodes the still image encoded data input from the storage unit 107, and generates still image decoded data. As the compression information accompanying the decoded data, information related to the compression rate and quantization value at the time of encoding is also generated. The generated still image decoding data and compression information are sent to the still image re-encoding unit 402.

  The still image re-encoding unit 402 encodes the still image decoded data at a higher compression rate than that at the time of storage to generate still image re-decoded data. The storage unit 107 stores still image re-decoded data, but at this time, the already stored encoded data of the frame is deleted.

  As described above, more still image encoded data can be accumulated by compressing still image encoded data that has passed a predetermined time after accumulation at a higher compression rate. That is, it is possible to provide a high-definition still image from the present time to a time point that goes back for a long time.

  FIG. 7 is a diagram showing an internal configuration of the transmission unit of the image transmission system according to Embodiment 5 of the present invention. Compared with the fourth embodiment, a difference is that a resolution conversion unit 501 is added to the transmission unit 50.

  In the still image decoding unit 401, as in the image transmission system according to the fourth embodiment, decoding of still image encoded data for which a predetermined time has elapsed after accumulation is performed. The decoded still image decoded data is input to the resolution conversion means 501 and subjected to image size reduction processing.

  The still image re-encoding unit 402 performs re-encoding processing on the still image decoded data subjected to the resolution conversion to generate still image re-decoded data. The storage unit 107 stores still image re-decoded data, but at this time, the already stored encoded data of the frame is deleted. In addition, when outputting the encoded data to be re-encoded to the still image decoding unit 401, the storage unit 107 may perform frame thinning at an arbitrary interval and erase the thinned data.

  As described above, by reducing the time resolution of still image encoded data that has passed a predetermined time after storage and reducing the image size, more still image encoded data can be stored. That is, it is possible to provide a high-definition still image from the present time to a time point that goes back for a long time.

  In the above embodiment, the image transmission system having four transmission units has been described. However, the present invention is not limited to this, and any number of transmission units may be connected to the reception unit. Needless to say, the number of moving image encoding means and resolution conversion means in the receiving unit is also configured corresponding to the number of transmitting units to be connected.

  INDUSTRIAL APPLICABILITY The image transmission system and the image transmission method of the present invention have an effect of providing high-definition images before and after the occurrence of an abnormality without increasing the load on the transmission path, and monitor an plurality of points at once. It is useful in such cases.

The figure which shows the system configuration | structure of the image transmission system in embodiment of this invention The figure which shows the internal structure of the transmission part of the image transmission system in Embodiment 1 of this invention, and a receiving part. Schematic diagram showing a screen display example on the display means of the receiving unit The figure which shows the internal structure of the transmission part of the image transmission system in Embodiment 2 of this invention, and a receiving part. The figure which shows the internal structure of the transmission part of the image transmission system in Embodiment 3 of this invention, and a receiving part. The figure which shows the internal structure of the transmission part of the image transmission system in Embodiment 4 of this invention. The figure which shows the internal structure of the transmission part of the image transmission system in Embodiment 5 of this invention.

Explanation of symbols

10, 20, 30, 40, 50 Transmitter 11, 21, 31 Receiver 101 Imaging means 102 Still image input control means 103 Video input control means 104 Abnormality detection means 105 Still image encoding means 106 Video encoding means 107 Storage means 108 transmitting means 111 receiving means 112, 113, 114, 115 moving picture decoding means 116 still image decoding means 118, 119, 120, 121 resolution converting means 117 display means 201 receiving means 211 still image requesting means 212 transmitting means 301 image processing Means 311 Enlarged area designation means 401 Still picture decoding means 402 Still picture re-encoding means 501 Resolution conversion means

Claims (7)

An image transmission system including a plurality of transmission units and a reception unit,
The transmission unit includes an imaging unit that captures an image of each subject, an abnormality detection unit that detects an abnormality in the imaging region and generates alarm information, and temporal resolution and image size of the image data generated by the imaging unit. Moving image input control means for controlling, moving image encoding means for generating moving image encoded data by performing moving image encoding of the image data controlled by the moving image input control means, and image data generated by the imaging means On the other hand, still image input control means for controlling time resolution, and still image encoding means for performing still image encoding of the image data controlled by the still image input control means and generating still image encoded data And storage means for storing the still image encoded data and outputting the stored still image encoded data based on the alarm information, the moving image encoded data, and the still image No. data, comprising the alarm information, and a transmitting means for transmitting the camera ID assigned for identification of the imaging means to a transmission line, and receiving means for receiving the information transmitted from the receiving unit,
The receiving unit receives the moving image encoded data, the still image encoded data, the alarm information, and the camera ID transmitted from the transmitting unit of the transmitting unit, and decodes the moving image encoded data. A moving picture decoding means for generating moving picture decoded data, a still picture decoding means for decoding the still picture encoded data and generating still picture decoded data, the moving picture decoded data and the still picture decoded data, Display means for displaying based on the alarm information and the camera ID, a still picture request information generating means for generating still picture request information, and transmitting the still picture request information to the transmitter and transmitting the alarm information A transmission means for transmitting the alarm information to another transmission section different from the transmission section
The moving image input control means controls the time resolution and image size of the image data based on the alarm information and the still image request information, and the moving image encoding means is based on the alarm information and the still image request information. The moving image coding is performed, the still image coding means performs still image coding so as to have a lower compression and a higher spatial resolution than the moving image coded data, and the moving image input control means of the other transmission unit includes: An image transmission system that reduces an image size based on alarm information transmitted from the receiving unit. The transmission unit includes an image processing unit that performs an enlargement process by cutting out an arbitrary region of the image, and the reception unit requests an enlargement for instructing the enlargement of the arbitrary region with respect to the image displayed on the display unit An enlarged area specifying means for generating area information is provided,
When the abnormality detection unit detects abnormality in the imaging region and generates abnormal region information, the transmission unit of the reception unit transmits the enlargement request region information to the transmission unit, and the reception unit of the transmission unit receiving the expanded request area information, the image of claim 1, wherein the image processing means and performs an enlargement process by cutting out abnormal region from the captured image based on the abnormal region information and the enlargement required area information Transmission system. The transmission unit performs a decoding process on the still image encoded data stored in the storage unit after a lapse of an arbitrary time, and generates still image decoded data; and the still image decoded data Re-encoding means for performing encoding processing at a higher compression rate than at the time of storage,
Said storage means, said stored still image coded data that has been subjected to re-encoding process, to claim 1 or 2, characterized in that to erase the still image encoded image the initially stored the frame The image transmission system described. The transmission unit performs a decoding process on the still image encoded data stored in the storage unit and generates still image decoded data; and an image after an arbitrary time has elapsed in the still image decoded data. A resolution conversion unit that performs a size reduction process, and a re-encoding unit that performs an encoding process on the image data output from the resolution conversion unit,
The accumulating unit performs frame thinning of the still image encoded data after an arbitrary time at arbitrary intervals, accumulates the re-encoded reduced still image encoded data, and stores the frame stored first image transmission system according to claim 1 or 2, characterized in that to erase the still image coded image. An image transmission method in an image transmission system having a plurality of transmission units and reception units,
An imaging step of photographing a subject by the transmission unit;
An abnormality detection step for detecting an abnormality in the imaging region and generating alarm information;
A video encoding step for controlling the time resolution and image size for the image data generated in the imaging step, and generating video encoded data;
Still image encoding step for controlling the time resolution for the image data generated in the imaging step and generating still image encoded data;
An accumulation step of accumulating the still image encoded data and outputting the accumulated still image encoded data based on the alarm information;
A transmission step of transmitting the moving image encoded data, the still image encoded data, the alarm information, and the ID for identification of the transmission unit from the transmission unit to a transmission path;
Receiving the moving image encoded data, the still image encoded data, the alarm information, and the identification ID transmitted to the transmission path;
A video decoding step of decoding the video encoded data and generating video decoded data;
A still image decoding step of decoding the still image encoded data and generating still image decoded data;
A display step of displaying the video decoding data and the still image decoding data based on the alarm information and the identification ID;
A still image request information generation step for generating still image request information;
Transmitting the still image request information to the transmission path, and transmitting the received alarm information to the transmission path again.
The moving image encoding step controls time resolution and image size of image data based on the alarm information and the still image request information, performs moving image encoding, and the still image encoding step includes the moving image encoded data. In addition to performing still image encoding so as to achieve lower compression and higher spatial resolution, the moving image encoding step is based on alarm information transmitted again, and other transmissions that are different from the transmission unit that generated the alarm information. An image transmission method characterized by reducing the image size of image data photographed by a unit. An image transmission system including a plurality of transmission units and a reception unit,
The transmission unit is configured to capture an image of the subject, an abnormality detection unit that detects an abnormality in the imaging region and generates alarm information, and image data generated by the imaging unit based on the alarm information. Moving image encoding means for controlling the size and generating moving image encoded data, still image encoding means for generating still image encoded data for the image data generated by the imaging means, and the still image encoding Storing means for storing data, and outputting the still image encoded data accumulated in time from the time of occurrence of the alarm based on the alarm information, the moving image encoded data, the still image encoded data, the alarm A transmission unit that transmits information and an identification ID of the transmission unit; and a reception unit that receives information transmitted from the reception unit;
The receiving unit receives the moving image encoded data, the still image encoded data, the alarm information, and the identification ID transmitted from the transmitting unit, and decodes the moving image encoded data, Video decoding means for generating video decoding data, still picture decoding means for decoding the still picture encoded data and generating still picture decoded data, the video decoding data and the still picture decoding data, the alarm Information, display means for displaying based on the identification ID, and transmission means for transmitting the alarm information to another transmission unit different from the transmission unit that transmitted the alarm information,
The moving image encoding means of the other transmission unit is an image transmission system that reduces the image size based on the alarm information transmitted from the reception unit. An image transmission method in an image transmission system having a plurality of cameras,
An imaging step of photographing a subject with a camera;
An abnormality detection step for detecting an abnormality in the imaging region and generating alarm information;
A video encoding step for controlling the image size of the image data based on the alarm information and generating video encoded data;
Still image encoding step for generating still image encoded data for the image data;
A transmission step of transmitting the moving image encoded data, the still image encoded data, the alarm information, and the identification ID of the camera to a transmission path;
Receiving the moving image encoded data, the still image encoded data, the alarm information, and the identification ID transmitted to the transmission path;
A video decoding step of decoding the video encoded data and generating video decoded data;
A still image decoding step of decoding the still image encoded data and generating still image decoded data;
Transmitting the received alarm information again to the transmission line, and
The moving image encoding step is an image transmission method in which the image size of image data captured by another camera different from the camera that generated the alarm information is reduced based on the alarm information transmitted again.

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