The application discloses a time
watermark extraction method and device based on picture
optical identification, in which an operation and maintenance personnel submits an equipment operation and maintenance
clock-in picture and current
latitude and
longitude position information through a terminal. After being acquired by a work
order system, the corresponding pre-stored equipment
latitude and
longitude position information is called, the actual distance between the two is calculated and compared with a set threshold value; if the distance is smaller than the threshold value, the picture is determined to be valid to enter a subsequent step, otherwise, the picture is determined to be invalid and a re-submission instruction is sent to the terminal. Through an
open source large model, text information is extracted from the valid picture by
optical identification, compared with a preset time format
regular expression, and a time text segment existing in the comparison is intercepted, otherwise, the extraction is re-identified; the
time segment is converted into a
standard time object according to a set format, and a manually filled work order
completion time in the work
order system is replaced, so that automatic correction is realized. The application solves the problems of low efficiency and easy error of manual identification of the picture time
watermark, and lack of a picture authenticity
verification method.