Freshwater fish quality detection device and detection method

The invention discloses a freshwater fish quality detection device and method, the detection device comprises a conveying device, an industrial camera and a line laser, the industrial camera is placed right above a collection area of the conveying device, the line laser is obliquely erected above the collection area of the conveying device, and a certain included angle is formed between the line laser and the surface of a detected object; when the freshwater fish is conveyed forwards on the conveying belt, light beams output by the line laser device are irradiated on the fish body in the direction perpendicular to the conveying direction, real-time images of the freshwater fish are collected through the industrial camera to obtain the contour of the laser on the upper surface of the fish body, and the image of the area is denoised to obtain the image of the fish body. The contour line of the laser is converted into the actual physical height of the upper surface contour of the instant cross section of the fre