Graph focusing evaluation method

The invention provides a graph focusing evaluation method, which comprises the following steps of: carrying out gradient calculation on a group of pictures shot by a camera by utilizing a Sobel edge detection algorithm, selecting one picture with the highest gradient, feeding the selected picture into a deep learning AI algorithm, judging whether the picture is clear or not through AI, and when the AI considers that the picture is clear, determining that the position of the picture is a focal plane position; when the AI is considered to be fuzzy, a group of pictures shot by the camera are all fed into a deep learning AI algorithm, the AI finds out the clearest picture in the group of pictures, and the position of the picture is the focal plane position; if the AI considers that the group of pictures are clear, but the clear pictures are impurity pictures, the camera is called to continue to shoot a group of pictures downwards, and the above process is repeated until the camera sets a limit position; and if th