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1.
基于单摄像机视频的鱼类三维自动跟踪方法初探   总被引:5,自引:3,他引:2  
徐盼麟  韩军  童剑锋 《水产学报》2012,36(4):623-628
为提高鱼类行为学数据的提取效率, 实验提出了一种基于单摄像机的鱼类三维观测方法, 将防水镜面安装在实验用鱼缸上方, 模拟一台由上向下拍摄的摄像机, 实现了单摄像机三维成像。同时运用多目标跟踪的IMMJPDA(interacting multiple model joint probabilistic data association)算法, 实现了鱼类运动的三维实时自动跟踪, 并通过摄像机倾斜矫正和摄像机标定提高了测量精度。通过对6条红鼻剪刀鱼的跟踪, 实验结果显示: 本方法可正确区分、提取和跟踪鱼群个体以及它们的镜像, 自动输出鱼的三维坐标、实时速度、方向等参数, 并生成完整的鱼类行为三维轨迹图。  相似文献   

2.
<正>用于鱼类室内三维跟踪的红外反射系统很多鱼类养殖设施已装备了由人工操纵的摄像系统,用于鱼类行为监测。例如,鱼一旦吃饱就关停的投饲系统,或监测由水质恶劣或疾病导致的鱼类行为异常。本研究展示的用于室内跟踪鱼类的三维红外反射(IREF)系统可让鱼类行为的监测自动化,其因省去了人工连续监控的需求而降低了系统的运行成本,通过剔除人为主观因素而提高了鱼类行为分析的准确性。该系统的工作  相似文献   

3.
为了保证鱼类行为数据采集的准确性和鲁棒性,本实验提出了一种干扰消除算法,对鱼目标三维定位算法进行优化。主要针对鱼目标三维信息采集平台中出现的一种由全反射引起的干扰现象,利用光学原理分析其出现原因,总结干扰现象特点,之后通过基于轮廓的运动目标跟踪方法,设计干扰消除算法,优化鱼目标三维定位算法,实现对干扰现象影响的消除,提高定位精度。通过对红鲫和仿真鱼的定位实验,结果发现,本实验提出的去干扰优化算法可以有效消除干扰像对于目标定位的影响,准确获取鱼目标的三维坐标,保证鱼目标三维定位跟踪的准确性和鲁棒性,提高鱼目标行为信息采集精度。  相似文献   

4.
针对传统理化方法分析水质污染情况耗时耗力等问题,提出一种基于鱼类异常行为识别的水质监测方法。以红色斑马鱼(red zebrafish)为研究对象,利用计算机视觉技术,首先对斑马鱼图像进行预处理,利用灰度共生矩阵获取鱼群纹理特征;然后通过Lucas-Kanade光流法计算鱼群的运动信息熵,并对获取的纹理特征和信息熵进行归一化处理;最后采用轻量化梯度促进机(LightGBM)对鱼类异常行为进行检测,与深度神经网络(DNN)和支持向量机(SVM)检测效果对比。结果显示:利用LightGBM对鱼类异常行为进行检测,准确率为98.5%,与其他模型对比分别提高0.5%和25.3%。研究表明,基于LightGBM模型的鱼类异常行为检测方法相比其他模型能更准确地识别鱼类非正常游动。该模型适用于自动水质监测。  相似文献   

5.
《渔业现代化》2016,(6):60-60
目前全球鱼类资源的衰退引起了对渔业捕捞活动和捉放式捕鱼活动的可持续性的质疑,推动了对总捕捞压力进行量化的努力。鱼捕获到船上后的死亡率相对容易获得,但精确地评估放生后鱼的死亡率和亚致死行为影响已被证明是困难的。加速度数据记录器( ADLs)是鱼类放生研究中的一个有用工具,但还没有得到充分利用。本文旨在论证ADLs在确定放生鱼类生死情况方面的应用,并使用基于加速度的鱼类游动度量指标量化放生鱼类恢复期的方法提供一个实例。为了对该方法的应用进行阐述,使用了来自佛罗里达休闲鲨鱼渔业中捕捉后放生的黑边鳍真鲨的样本数据。鲨鱼死亡事件从鲨鱼所处固定水深的踪迹及其最终停止摆尾活动中加以推断,而获得的姿态信息则可用于证实所植入的标志仍附着在鲨鱼上。还对如何将来自存活的鲨鱼个体的ADL数据用于计算鲨鱼游动行为的58个精细度量指标做了详细描述。计算出的恢复期范围在5.1~19?5 h,平均(10.54±3.78)h。 ADLs的成本低,因而具备多点部署的能力。 ADLs提供了放生鱼类死亡的明确证据,而且还允许对亚致死症状进行量化,使其可用于度量不同操作器具或处置方式带来的影响,甚至可用于罕有死亡事件发生的物种。  相似文献   

6.
正黄颡鱼(Pelteobagrus fulvidraco)属鲶形目,鲿科,黄颡鱼属,其生长速度较慢,常见个体体质量200~300 g,肉质细嫩、味道鲜美,是江苏地区重要的淡水养殖鱼类之一。在池塘养殖过程中,水环境条件往往成为决定养殖成败的关键,水质的好坏直接影响鱼类的生长和疾病发生情况~[1-4]。目前对于黄颡鱼养殖池塘水质因子研究,仅有张红等~[5]报道了池塘中氮磷的变化。该研究跟踪江苏省了南京地区  相似文献   

7.
光照条件下南极磷虾的行为观察   总被引:3,自引:1,他引:2  
2010—2011年随中国大型拖网加工船“安兴海”轮在南极南奥克尼群岛附近进行南极磷虾拖网作业,将作业过程中采集到的鲜活南极磷虾立刻转移至实验水箱,进行暂养并观察其行为。实验样本为45尾,体长为37~50 mm,整个实验持续时间为13 d,水面光照为220 lx,水温恒定在0 ℃。通过观察发现:(1) 南极磷虾进入实验水箱后体色迅速变为透明;(2) 在静水环境中,南极磷虾多数时间位置相对固定,集中于角落,沿箱壁进行角落间游动,较少穿过水箱中央,穿过水箱中央时有加速游动的现象;动水环境中能够顶流游动并形成集群,0.5 m/s时顶流游动,流速超过1 m/s时,集群消失;水流对南极磷虾的集群有极显著影响;(3) 南极磷虾进入水箱后第6天开始蜕壳,第6~9天均发现虾壳,实验对象平均体长增长5~8 mm。  相似文献   

8.
基于声学标签系统的鱼类运动轨迹监测技术   总被引:1,自引:0,他引:1  
声学标签监测技术是声波监测技术的一种主动识别方法,其通过接收、处理移植或捆绑于鱼类身上的声学标签发射的声波信号来获得鱼类二维、三维运动轨迹,具有原位观察、定位准确、数据处理简单和数据连续性好等优点。文章介绍了声学标签监测技术的组成及工作原理,并根据异常数据的不同特点总结了一套完整的数据去噪、清洗的处理方法,该法可快速得到鱼类的二维、三维运动轨迹。通过实例分析了鱼类运动轨迹的分布情况以及变化规律。根据鱼类在不同水生态环境中的运动行为响应情况,可以直接或间接判断水中污染物或有毒物质对鱼类的潜在影响以及实际毒性,为渔业养殖水质环境评价、水质监测及预警、水生态健康评价以及水生态修复效果评价的研究提供参考依据。  相似文献   

9.
《渔业现代化》2009,(4):74-74
6月29日,在海南三亚湾畔的凤凰岛2009年北部湾海洋生物资源增殖放流仪式上,3条巨大的鲸鲨从南海深海网箱中游向大海。这是我国首次举行鲸鲨放流活动。放流的3条鲸鲨中,2条分别命名为“南海I号”和“南海Ⅱ号”的鲸鲨背上装有卫星定位跟踪系统(GPS),由农业部南海区渔政局联合香港海洋公园、海南省水产研究所共同实施,可研究、探索国际濒临绝种水生野生动物保护、养护策略。卫星跟踪仪用来记录鲸鲨洄游轨迹。一段时间后,该仪器会自动从鲸鲨身上脱落,将相关信息传回。鲸鲨是世界上最大的鱼类,通常体长在10m左右,最大可达20m。  相似文献   

10.
以蓝鳃太阳鱼和绿鳃太阳鱼杂交产生的杂交太阳鱼F1代为研究对象,研究了不同生态基的使用量对室内养殖系统中杂交太阳鱼的生长及养殖水质的影响。实验共设置0.049、0.098、0.197、0.295和0.393 m~2/m~3五种不同生态基使用量梯度,以不使用生态基的养殖桶为对照组,每组设置3个重复,共使用18个养殖桶。实验期间使用纳米圆盘底增氧方式增氧,整个养殖期间不换水,持续对水体溶解氧(DO)、pH和温度(Wt)进行监测,每5天测定水体总氨氮(TAN)和亚硝酸盐氮(NO-2-N)含量,实验开始和结束时分别测定杂交太阳鱼的生长情况。结果表明:使用生态基能有效促进杂交太阳鱼的生长、降低饲料系数,同时改善养殖水体的水质,平均总氨氮浓度与对照组相比可降低24.15%。通过回归分析可知,杂交太阳鱼养殖中生态基的适宜使用量低限为0.244 m~2/m~3。  相似文献   

11.
There are various techniques for identifying fish species, including the multi-frequency method, in situ target strength characteristics, and digital image processing methods. Acoustic Doppler current profilers (ADCPs) are able to determine multiple current fields simultaneously and have been used to observe the swimming speed and behavior patterns of shoals of pelagic fish under natural conditions. In this study, we evaluated a classification method that can be used to determine the swimming velocity of both the sound-scattering layer and pelagic fish shoals using an ADCP (153.6 kHz) and a scientific echosounder (38, 200 kHz). To calculate the actual swimming speed of the fish shoals, the mean swimming velocity vectors of each stratified bin must be compared with the mean surrounding three-dimensional (3D) current velocity vectors. We found the average 3D swimming velocity of the sound-scattering layer to be characterized by a deviation of >5.3 cm/s from the surrounding current field. The average 3D swimming velocity of Pacific saury Cololabis saira was calculated to be 91.3 cm/s, while that of lanternfish Diaphus theta was 28.1 cm/s. These swimming speeds correspond to 4.19- and 4.26-fold the body length, respectively. Thus, the use of ADCP swimming velocity data can be expected to be a valuable species identification method for various fishes distributed in a given survey area.  相似文献   

12.
ABSTRACT:   The tail beat and activity behavior of four captive Japanese flounder Paralichthys olivaceus , were monitored with acceleration data-loggers while the fish swam in an aquarium. Depth, swimming speeds and two-axis acceleration data were collected continuously for approximately 20 h per fish. Simultaneously, the swimming behaviors of the fish were filmed at different angles. Using the specific characteristic of the acceleration profiles, in tandem with other types of data (e.g. speed and depth), four behavioral patterns could be distinguished: (i) 'active' swimming; (ii) burying patterns; (iii) 'inactive' gliding; and (iv) lying on the bottom. Tail beat frequency ranged from 1.65 ± 0.47 to 2.04 ± 0.25 Hz (mean ± SD; n  = 4). Using the relationship between tail beat frequency and swimming speed, the 'preferred' swimming speed of the fish was estimated to be between 0.6 and 1.2 body lengths (BL)/s. Additionally, fish rarely swam faster than 1.2 BL/s. This study shows that the acceleration data-loggers represent a useful and reliable system for accurately recording the tail beat of free-ranging fish and estimating flatfish behavior.  相似文献   

13.
Cage design and stocking density are important aspects of aquaculture farm design, therefore understanding how fish behave at different stocking densities is critical information for farm managers. In this study, high resolution acoustic telemetry was used to investigate the swimming behavior of adult Atlantic cod, Gadus morhua, that were stocked at four densities (5, 10, 25, and 45 kg/m3). Acoustic tags were placed into the abdominal cavity of five fish per density treatment so their swimming behavior could be continuously monitored throughout the study. An array of hydrophones made it possible to calculate the position of each fish in three dimensions, at ~2–5 sec intervals, for 4–30 d. Three underwater cameras were used to obtain additional data about the distribution of fish in the cage during the daytime. At the lowest density, the cod spent the majority (64.3 ± 0.08%) of their time in the bottom third of the net pen. As density increased, the fish moved higher in the water column, and this behavior was most evident at night, at all densities. At no time throughout the entire study were there any obvious occurrences of schooling behavior, even at the highest density (45 kg/m3).  相似文献   

14.
Behavioral variations of a school of fish (Carrasius auratus) in a tank were monitored using computerized vision while the fish were subjected to hypoxia stress conditions. Two video cameras viewed the tank, one from the side through a transparent wall and one from above. The images were processed by a PC-based image processing algorithm which provided three coordinates of the school's center of gravity, with the standard deviations of each coordinate, and the projected spatial distribution of the fish. Stressed fish differed from controls with the following behavioral responses: (i) the center of gravity moved upwards and horizontally away from the transparent wall; (ii) swimming speed was apparently reduced; (iii) there were strong fluctuations in all three directions associated with spreading and contracting of the school; (iv) the periodic amplitude of the motion in the vertical direction increased. This study might evolve into an automatic stress warning technique for fish farms, based on alterations in the behavior of fish when stressed.  相似文献   

15.
An experiment was conducted to measure swimming activity of rainbow trout (254.0±33.7 g) held in outdoor tanks under three culture conditions with stocking density used to generate differences: 27 (Culture Density 1, CD1), 80 (CD2) and 136 kg m−3 (CD3). Fish were fed dry pellets at 1% of tank biomass from 9h00 to 13h00 with automatic feeders. Using acoustic telemetry, fish positions were monitored every 5 s during 48 h for nine fish (three in each treatment). Swimming behaviour was analysed in terms of trajectories: they varied between (i) holding position (high turning angles), (ii) chaotic trajectories (equal use of all turning angles) and (iii) circular swimming (average turning angle of 60°). Space utilisation differed for each culture condition: CD3 conditions induced a prolonged residence time in the central zone of the tank. Rainbow trout swimming activity patterns and levels differed depending on both day–night alternation and culture conditions. All fish reared at CD1 and one reared at CD2 were day-active. All the other fish showed high activity pattern variability and a higher swimming level was observed under CD3. These results illustrate that monitoring fish swimming activity is feasible even under high densities and provide relevant insights on fish activity which can lead to behavioural welfare indices in relation to constraints imposed by culture conditions.  相似文献   

16.
The Mexican cichlid Cichlasoma beani is currently exploited regionally as food and can be commercialized in the aquarium trade. Natural populations of C. beani may already be negatively affected by anthropogenic alteration of the areas in which it is distributed. The aim of the present study was to examine the effect on growth, survival, and condition of C. beani cultured in three stocking densities: three (D3), six (D6), and nine (D9) fish per each 40 L tank. At the end of a 6‐wk trial the fish cultured in D3 were longer, heavier, and grew faster than the rest of the treatments but their survival was the lowest compared to D6 and D9. The mortalities were caused by a strong aggressive behavior in D3.  相似文献   

17.
实验室条件下麦穗鱼群体动态结构的表达   总被引:1,自引:1,他引:0       下载免费PDF全文
为了探究麦穗鱼群体动态结构的特征参数,以及这些参数可能反映的行为机理,本实验使用2台摄像机从俯视和侧视2个方向同时拍摄由13尾麦穗鱼组成的群体,获取连续时间内麦穗鱼群体中各个体的三维位置数据,对个体间最近邻近距离、视角、转角变化量、个体游泳速度等参数进行分析。结果表明:麦穗鱼个体最近邻近距离多数处于0.5~2 BL,偏好的最近邻近距离为0.6~0.8 BL;麦穗鱼总是将最邻近的个体保持在本鱼80°视野范围内;避免碰撞时,个体鱼转角改变量为0~30°;在无人为干扰的自然环境下,个体鱼以0.75 BL/s左右的速度配合其他个体保持运动速度一致性。实验观察证实,视觉对麦穗鱼个体间的分布起着关键性作用,此外麦穗鱼群体动态结构还受到个体状态(饱食与饥饿)的影响。  相似文献   

18.
基于成像声呐的鱼类三维空间分布   总被引:1,自引:0,他引:1  
针对海洋牧场中鱼群的三维空间分布问题,本研究提出一种利用成像声呐进行位置计算的方法。将成像声呐固定在船舷外侧的水下,并保证波束发射方向和声呐移动方向一致,通过走航的方式采集水下鱼群信息。首先对采集的原始数据进行图像处理,包括图像构建、背景去除、目标提取等,然后利用基于交互式多模型联合概率数据关联算法对水下目标进行关联处理,得到同一个目标在声呐水平视场中不同帧图像中的对应关系,在此基础上根据连续两帧图像中目标位置关系计算目标的空间坐标,最后结合关联算法获得多目标在三维空间中的运动轨迹以及深度分布情况。研究表明,本方法可以有效获取鱼群在水下的三维运动轨迹及其分布情况,这将为鱼类行为分析以及海洋牧场的资源评估提供技术支持。  相似文献   

19.
HYEON-OK  SHIN  DAE-JAE  LEE  HYEONG-IL  SHIN 《Fisheries Science》2003,69(1):27-36
ABSTRACT:   The swimming behavior trajectory of an Israeli carp (body length 28 cm) during dynamite explosion work was obtained by the long baseline acoustic telemetry system with an ultrasonic pinger in an aquaculture cage located at Chungju Lake on 2 May 1997. The underwater noise levels measured at a distance of 400 m from the source of noise increased by 40 dB (re 1 µPa) compared to the levels before the explosion. The swimming area of the fish was reduced immediately after the explosion but more than 1 h after the explosion the fish had returned to a similar swimming area and behavior as right before the explosion. The fish usually swam less than 1.5 m from the water surface except during or right after the explosion. When there was an external stimulus, such as, an explosion the fish swam downwards. The average swimming speeds of the fish before, during and after the explosion were approximately 0.33 m/s, 0.52 m/s and 0.29 m/s, respectively, and the average swimming speed of the fish during the explosion was 1.6 times faster than usual.  相似文献   

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