TWI501650B - Monitor the image processing method - Google Patents

Description

Surveillance image processing method

The invention relates to a monitoring image processing method, which mainly relates to a technology for constructing a dynamic selection resolution at a receiving decoding end, so as to greatly improve the method for monitoring image processing efficiency.

Due to the rapid development of network transmission and video compression technology, its application objects and fields are becoming wider and wider, and the surveillance system has fully utilized these mature technologies. Video compression technology can compress images captured by cameras into specific ones. The format (such as H.264, MPEG 4, JPEG, etc.) is then converted to a video stream for transmission over the network.

The image transmission mode of the general monitoring system is transmitted by video stream on the network as described above. In the receiving end, the video stream is decoded, and the image signal of a specific compression format is restored to the original format. Play to the Frame Buffer. The receiving end decodes the received video stream without considering the resolution of the display, and sends the decoded data to the view box. When the resolution of the transmitted image is consistent with the resolution of the display at the receiving end, the image processing method described above is self-explanatory, but the resolution of the transmitted image is inconsistent with the resolution of the display at the receiving end, especially the resolution of the transmitted image is much larger than that of the receiving end display. For resolution, for example, the resolution of the transmitted video stream is megapixel (M-Pixel) image (such as 1280x1024), and the resolution of the receiving end is 720x480 (DVD level). In this case, even the receiving end All the decoded data is completely transferred to the view box, and it cannot be The display produces a resolution of 1280x1024, which increases the time it takes to move data and affects its processing performance.

It can be seen from the above that the existing monitoring image processing method does not consider the difference in resolution between the transmitted image and the display, which causes waste of processing resources and affects its performance, so it is necessary to further review and seek a feasible solution.

Therefore, the main purpose of the present invention is to provide a monitoring image processing method, which can dynamically select the display range of the transmitted image at the receiving end, and only decode the display range, and then send the decoded data to the view box temporary register. This greatly reduces the amount of data transferred to the frame buffer and shortens the time it takes to move the data, thereby improving the efficiency of image processing.

The main technical means for achieving the foregoing objective is that the method includes: receiving a compressed video stream; determining, according to a header content of the compressed image, whether the image resolution is greater than a set value; and when the image resolution is not greater than a set value, That is, the compressed image is directly decoded, and the decoded data is transmitted to the view box register; if the image resolution is greater than the set value, a display block is reselected; the compressed image is decoded; and the decoded position is displayed. In the block, the decoded data in the display block is sent to the view box register; since the above method only sends the decoded data in the selected display block to the view frame register, the data can be saved greatly. Time, for example The value is megapixel or more. If the receiving end does not need such high-precision image quality, or the display resolution is less than megapixels, the above method can be used to dynamically select a display block that meets the needs or matches the size of the display screen. This can greatly reduce the time to move data and improve image processing performance.

For a flowchart of a preferred embodiment of the present invention, refer to the first figure, which includes: receiving a video stream (101). In this embodiment, the network camera (IP CAM) is received through the network. The video stream is ingested and compressed into a specific format, and the compression format may be MPEG 4, H.264 or JPEG, etc.; converted into a packet form for transmission on the network; and it is determined whether the resolution of the received image is greater than a set value (102) In this embodiment, the setting value is megapixel (M-Pixel) or more, that is, megapixel is used as a threshold for special processing of the image; when the receiving end is compressed by the header of the compressed image file It is known that when the image is not more than megapixels, the compressed image is directly decoded (103) to be restored to the original format of the image, and then sent to a view box temporary register (104) for live (Live). Playback (105); when the receiving end knows that the image is megapixel by the header content of the compressed image file, a display block (106) is dynamically selected for the image, as shown in the second figure, assuming one The original resolution of the image is 1280 (horizontal) x1024 (vertical) The display and the receiver (20) of the resolution is 720x480, you define the selection range (10) as a 720x480 display area, the selection region (10) and movable on the image, not to select the image The same position is used as the display block.

After the display block is determined by the selected range (10), the compressed image is initially decoded and transmitted (107).

For details of the steps of decoding and transmitting data, please refer to the third figure, which includes: setting the starting point and range (107A) of the display block, as shown in the second figure, by using the moving one to select the range (10) After determining a display block, the starting point (crop_x, crop_y) is obtained; the compressed image is decoded (Decode) (107B); whether the decoding position is within the display block (107C); if not in the display area Within the block, returning to step (107B); if the decoding position is within the display block, the decoded data is sent to the view box register (107D); then it is determined whether the compressed image is decoded (107E); Upon completion, the process returns to step (107B); if the decoding is completed, it ends.

It can be seen from the above process that after the compressed image received by the network is first determined whether the resolution is greater than a set value (for example, more than megapixels), if it is smaller than the set value, it is processed according to the traditional method, if it is greater than the setting. The value can be used by the user to redefine the display block of the image. When decoding, only the decoded data in the display block is sent to the view box register, thereby greatly saving the time for data transfer, thereby effectively Improve the efficiency of image processing; use the above method to match the resolution of the receiver display, or to meet the different requirements of the resolution in actual use.

(10) ‧‧‧Selection range

(20)‧‧‧ Display

First Figure: A flow chart of the present invention.

The second figure is a schematic diagram of selecting a display block on an image according to the present invention.

The third figure is a flow chart of decoding and transmitting data of the redefined display block by the present invention.

Claims (4)

A monitoring image processing method includes the following steps: receiving a compressed image; determining whether the image resolution is greater than a set value according to a header content of the compressed image; and directly decoding the compressed image when the image resolution is not greater than a set value And transmitting the decoded data to the view box register; if the image resolution is greater than the set value, re-selecting a display block; decoding the compressed image; determining whether the decoded position is in the display block; The data decoded in the block is sent to the view box register. The method for processing a surveillance image according to claim 1, wherein the compressed image is transmitted in a stream form. The surveillance image processing method according to claim 1, wherein the compression format of the image is MPEG 4, H.264 or JPEG. The monitoring image processing method according to any one of claims 1 to 3, wherein the set value is megapixel or more.