Online visual inspection device and method for surface dirt of group origin eggs

The invention discloses an online visual inspection device and an online visual inspection method for surface dirt of group origin eggs, relating to the technical field of egg processing and grading. The method comprises the following steps: (1) acquiring an egg image; (2) preprocessing the egg image; (3) extracting the color characteristic parameters, and dividing the eggs into green-shell eggs and white-shell eggs according to the shell color; (4) extracting the egg surface dirt characteristic parameters comprising the ratio of the dirt area to the whole egg area and the number of dirt blocks; (5) finding the characteristic parameter range for distinguishing the clean eggs and dirty eggs; and (6) establishing an automatic identification model, and discriminating the dirt on the eggs. Detection is performed by utilizing machine vision, and the method has the non-critical property on the application environment and has good popularization and application prospects; and moreover, high efficiency and high intelligence are realized, and nondestructive testing can be realized.