碩士 / 中興大學 / 生物產業機電工程學系所 / 95 / This research was to establish a simple computer counting system to replace the traditional manpower counting to solve the unfair trade by the traditional manpower fry counting and also improved the fishery profit by decreasing the cost of production. It obtained the faster and more accurate counting ability than the traditional manpower counting.
The main structures of this system included the application image processing technology and the PLC automation control technology. The procedure of the image processing was the grey level transformation, the images binary process, the opening and closing of the morphology, the XOR logic image processing, the morphological watersheds, and the blob analysis. The operation was based on the alternative type of a double channels exchange counting method that poured the fish larvae and water into each counting platform in sequence by the artificial mode. After taking the image by the camera in one channel, the image processing technology simultaneously counted the fish larva’s quantity which was then poured out and gathered. In the meantime, the other channel was also relied on the same method to count the fish larva’s number to save time.
According to the results by the cross comparing with varied water depths and varied quantity of fish larvae, it displayed that the overlapping rate was raised because of the increase of the water depth and the quantity of fish larvae. Taking the result of the grouper fish larva counting test, it showed that the error was below 2.47% while selecting the maximum number of three repetition at the quantity of fish larvas below 200 ind.. It took about 15 seconds to process of the simple computer counting system once so that the maximum of the counting number was up to 48000 ind./hr and the survival rate of fish larva was 99%. The simple computer counting system was 27.9 times as the rate of the traditional manpower counting, 4.9 times as the weight counting, 80 times as the detection line and 13.4 times as the photographical larval fish counting technique. The error rate was also lesser than the other methods. The experiment result of the Carassius auratus fry also showed that the error rate could be reduced by adjusting the water depth appropriately according to the size of fish larvae.
| Identifer | oai:union.ndltd.org:TW/095NCHU5415003 |
| Date | January 2007 |
| Creators | Chia-Hsien Wu, 吳家賢 |
| Contributors | 陳俊明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 115 |
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