A simple design of automatic counting system for fish larvae
Chien-hua Huang
Advisor: Dr. Sun-chio Fong
Institute of Marine Biology, National Sun Yat-sen University, Kaohsiung 804,Taiwan, R.O.C.
The purpose of this study is to develop a portable-computer system for automatic counting of fish larvae. It was intended as an economical, fast and accurate tool for the general fish farmers.
The basic principle of the system is to use gray level value of the three prime colors (red, green and blue) as an indicator to separate and estimate fish larvae within the CCTV image. The hardware part includes a CCTV camera which hooks up to an IBM compatible laptop computer. Images of fish in a tank were captured and stored for future counting process. Program was written in True Basic language for taking the average number of pixel for individual fish, and system optimization for estimating the total number of fishes within tank. Regression analytical methods were also employed for estimating and correction of bias and errors.
In an experiment using the present system to estimate known numbers (100, 300, 500, 700 and 900) of larval Paracheirodon innesi in a 60-liter tank as the testing material, the estimated fish numbers were 132, 259, 495, 799 and 1054 respectively. The group of 500 fishes (standard deviation equals to 88) gave the best result. The total percentage of error ranged between 0.9% and 32%.
Application of this system on other species of fishes is yet to be tested. It was safe to suggest that the current version of the system works only onto the same species of fishes under similar conditions (less than 1000 fishes of similar sizes, water depth of 25 cm etc.). For different target fishes under different type of container, a new set of error-correcting formula would be needed. However, the present results when compared with published reports of other system, are no less accurate. This system however is more economical and works more conveniently than do most others.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0714102-231111 |
| Date | 14 July 2002 |
| Creators | Huang, Chien-hua |
| Contributors | Sun-chio Fong, none, none |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0714102-231111 |
| Rights | unrestricted, Copyright information available at source archive |
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