Laser marking method for underwater scaly fish based on machine vision

Abstract

The invention relates to the technical field of fish body marking, in particular to a laser marking method for underwater scaly fish based on machine vision. Use the camera to take photos of the underwater scaled fish in the shooting position; analyze and process the photos of the fish body, construct the fish body coordinate system and obtain the coordinates of the fish body center point; select several scales near the coordinates of the fish body center point as marker scales , and then select a suitable area on the marking scale as the marking area, and calculate the coordinates of each marking area in the fish coordinate system. Construct and calculate the mapping relationship between the laser marking machine coordinate system, the equipment space coordinate system and the fish body coordinate system. Based on this mapping relationship, the coordinates of each marking area selected above are calculated and processed and sent to the marking machine. The marking machine marks each marking scale in turn. In the marking and marking method, the marking object is fish scales of living fish, without blood and tissue systems, without stimulation and damage to living fish, and the marking speed is fast and the effect is good.

Description

technical field [0001] The invention relates to the technical field of fish body marking, in particular to a laser marking method for underwater scaly fish based on machine vision. Background technique [0002] Traditional fish marking methods are divided into external marking, internal marking and electronic tag. [0003] External markings include line marks, tape marks, Petersen discs, T marks, spear marks and soft and hard plastic labels, etc. The main disadvantages are: it may cause fish infection, affect the growth and survival of fish, and the biological attachment of marks increases the resistance of fish activities And mark identification is difficult, which may cause fish to be trapped by aquatic plants or fishing gear, and the loss rate of tags is high, which is difficult to apply to small individual fish, which will affect fish swimming, predation or harm avoidance behavior; [0004] Internal markers include CTW markers, VI markers, VIE fluorescent markers, etc. ...

AI Technical Summary

Problems solved by technology

[0003] External markings include line marks, tape marks, Petersen discs, T marks, spear marks and soft and hard plastic labels, etc. The main disadvantages are: it may cause fish infection, affect the growth and survival of fish, and the biological attachment of marks increases the resistance of fish activities And mark identification is difficult, which may cause fish to be trapped by aquatic plants or fishing gear, and the loss rate of tags is high, which is difficult to apply to small individual fish, which will affect fish swimming, predation or harm avoidance behavior;

[0004] Internal markers include CTW markers, VI markers, VIE fluorescent markers, etc. The main disadvantages are: marking and identification equipment are expensive, professionals are required to apply and identify markers, marker retrieval and identification require a lot of manpower, and markers are easy to occur in fish Position migration, high rate of marker loss

[0005] The electronic tag is a PIT radio frequency tag, and its main disadvantages are: the price of PIT electronic tags and identification equipment is relatively high, there is a certain rate of tag loss, and the injection of PIT tags will cause local trauma to the fish body

[0006] The traditional marking method needs to manually fix the fish body, and most of the fish body needs to be out of the water for a period of time. In addition to the heavy manual workload, this operation will also have a relatively large impact on the marked fish body, directly reducing its survival rate

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