Snapshot method and system based on low-power monitoring device

A monitoring device and low-power consumption technology, which is applied in the direction of closed-circuit television system, TV system components, color TV components, etc., can solve the problems of not being able to capture in time, high cost of monitoring devices, and inability to determine the status of infrared light

Active Publication Date: 2020-10-09
HANGZHOU MEARI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problems in the prior art that snapshots are realized by building photoresistors or photosensitive equipment, and the status of infrared light cannot be determined in the infrared mode under hardware photosensitive conditions, and the cost of the monitoring device is high, and the capture cannot be realized in time, and provides A capture method and system for realizing a low-power consumption monitoring device through soft photosensitive

Method used

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  • Snapshot method and system based on low-power monitoring device
  • Snapshot method and system based on low-power monitoring device
  • Snapshot method and system based on low-power monitoring device

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Experimental program
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Effect test

Embodiment 1

[0079] A capture method based on a low-power monitoring device, comprising the following steps,

[0080] Step 1: After the monitoring device is powered on, initialize the image sensor of the monitoring device. In the initialization state, the infrared fill light or irCut is off;

[0081] Step 2: Wait for the first frame of image output by the image sensor; the image output format is YUV, and when the image output format is other formats, convert to YUV format;

[0082] Step 3: Calculate the average brightness K of the image Y vector by formula 1:

[0083]

[0084] In Formula 1: w is the pixel width, h is the pixel height, and I(i, j) is the brightness value of the corresponding pixel;

[0085] Step 4: Compare the brightness average value of the first frame with the 8lux recorded in the daytime static brightness data table; when the brightness average value of the first frame is greater than or equal to 8lux, it is the daytime mode and execute step 6; otherwise it is the ni...

Embodiment 2

[0118] On the basis of Embodiment 1, this embodiment also includes the step of performing an anti-false trigger judgment on the captured image, and when it is judged to be a falsely triggered capture, the image is not stored, otherwise the image is uploaded to the storage device for storage;

[0119] After the exposure algorithm converges, the exposure value and gain value in the dynamic brightness data table and the brightness value of the first frame are updated and stored.

[0120] Through the judgment of anti-false triggering, the image continuous wake-up operation caused by air temperature and air flow is further reduced.

[0121] The steps of anti-false trigger judgment include,

[0122] Divide the captured picture into 16 rows and 9 columns, and calculate the brightness average value of the pixel Y vector of each row and column respectively, and obtain 16*9 brightness average values;

[0123] Calculate the brightness histogram of the picture and do normalization;

[0...

Embodiment 3

[0128] On the basis of Embodiment 1, the capture system of the low-power monitoring device constituted by the low-power monitoring device of Embodiment 1 includes a wake-up module, a detection module, and a capture module,

[0129] Wake up the module, wake up the monitoring device through PIR hardware or network commands;

[0130] The detection module, for the awakened monitoring device, according to the soft photosensitive detection method, obtains the first frame of pictures to determine whether the current environment is in day mode or night mode, and adjusts the exposure parameters of the monitoring device to output images with stable brightness;

[0131] The capture module judges the brightness threshold value of the image output by the detection module, and sends a trigger signal when the brightness threshold value is exceeded, so as to capture the image.

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Abstract

The invention relates to a snapshot technology, and discloses a snapshot method and system based on a low-power monitoring device. The system comprises an awakening module which awakens the monitoringdevice through a PIR hardware device; a detection module which is used for acquiring a first frame of picture from the awakened monitoring device, determining whether the current environment is in adaytime mode or a night mode, adjusting exposure parameters of the monitoring device and outputting an image with stable brightness; and a snapshot module which is used for comparing the image with the stable brightness with a previously awakened image, filtering out a mistaken awakening scene and obtaining a snapshot of the image. For the low-power monitoring device, the light intensity can be recognized after rapid awakening, when the image sensor outputs the first frame of video, the light state is determined, IrCut and infrared switching is carried out, and exposure parameters are determined; the method designed by the invention is suitable for different image sensors and different hardware platforms, for the same image sensor, the snapshot function can be realized only by matching with different lenses, and the production cost is further reduced.

Description

technical field [0001] The invention relates to a capture technology, in particular to a capture method and system based on a low power consumption monitoring device. Background technique [0002] There are more and more applications of monitoring devices, such as preventing outsiders from intruding into the home, preventing courier vehicles from being stolen during delivery by couriers, and other occasions that need to be able to capture events in time. [0003] Since the low-power monitoring device is in a dormant state for a long time, when someone passes by, it can quickly wake up and quickly capture the first stable image. In order to quickly capture the first stable image, it is necessary to quickly determine the current light status and give Appropriate exposure parameters, so that the exposure algorithm and subsequent ISP can stabilize quickly, so as to obtain a picture with appropriate brightness. At present, the low-power monitoring devices on the market need to u...

Claims

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Application Information

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IPC IPC(8): H04N7/18H04N5/235H04N5/232
CPCH04N7/18H04N23/60H04N23/74
Inventor 聂树华
Owner HANGZHOU MEARI TECH CO LTD
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