Pulp deinking detection and evaluation method based on digital image processing

The invention belongs to the technical field of pulp deinking, and discloses a pulp deinking detection and evaluation method based on digital image processing. Through CCD imaging and according to a method of image processing, the particle diameter, the quantity, the agglomeration degree and the minimal detection precision of ink left in deinked pulp are calculated; according to relevant calculation parameters, the deinking effect of the deinked pulp is calculated. The method specifically comprises the steps of continuously sampling three times at the bottom, the middle and the top of deinkedpulp suspension liquid from a time t0, after an interval time of 10 minutes, fully stirring the pulp suspension liquid and repeating the sampling process to totally sample five times. On the basis ofa pulp deinking process, a scientific sampling method is formulated; through the combination of a Poisson distribution law of deinked pulp residual ink and through an image processing technology, a CCD image of the deinked pul