Method and system for calculating coal flow of coal conveying belt

The invention discloses a method and system for calculating the coal flow of a coal conveying belt, and the method comprises the steps: obtaining a video frame sequence of the coal conveying belt; enhancing an image frame in a belt detection region according to the gray value difference of the former and later two frames in the video frame sequence in a preset belt detection region, and obtaining a detection unit, wherein the detection unit comprises a plurality of independent detection sub-units with the same region areas; determining the attribute type of each detection sub-unit through employing the gray value of each detection sub-unit, wherein the attribute type comprises a belt type or a coal type; dividing the number of detection sub-units of the coal type by the number of all detection sub-units, and obtaining the coal flow. According to the technical scheme of the invention, the method does not need to employ a laser generator and a camera with a long focus lens like the prior art under the condition