Method for counting number of fish schools

Abstract

The invention discloses a method for counting the number of fish schools. The method comprises the following steps: step 1, acquiring sonar detection fish school data; step 2, preprocessing the obtained data to obtain a fish school acoustic image sequence (I1, I2, and Iq), and q is the total frame number; step 3, quickly establishing a background model by using front and back adjacent frames and interval frames from n frames of images in the fish school acoustic image sequence; step 4, segmenting each frame image by utilizing the background model to obtain a foreground target and carrying outbinarization; step 5, calculating the mass center of the foreground target of each connected region of each frame image, and labeling each frame image; and step 6, counting the number of the fish schools according to the mass center marked on each frame image. According to the method, the background can be directly extracted from a scene image containing a moving foreground, and modeling of the background and a target in a scene is not needed. False multiple targets generated during target extraction under the condition that the speed of a moving target is low are prevented, and the extractioneffect of the foreground target is guaranteed.

Description

technical field [0001] The invention relates to the technical field of fishery resource assessment, in particular to a method for counting fish populations. Background technique [0002] Hydroacoustic detection technology is an important means of fishery resource investigation and assessment. How to effectively, quickly and accurately assess the amount of resources is a key issue. In recent years, with the development of science and technology, high-frequency sonar has gradually been widely used in fishery management survey and assessment. Currently, in resource survey, the most used method is resource assessment by echo integration method, but this kind of estimation is relatively rough, and it is impossible to judge its return. Whether the wave is only fish school, the error is large, and some statistical software attached to sonar, if the fish school target is too small and the echo signal is weak, the statistical error is very large. [0003] At present, there are many ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of complex calculation and large amount of calculation that exist in the current counting method of fish population, and propose a new statistical method of fish count, which only needs to calculate the center of mass of the target by calculating Quantity statistics can be carried out by marking, which can detect and count the number of fish more accurately and efficiently in a short period of time

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