The Bulk Carrier Shipping Over Weight Measuring System Based On Image Processing

Draft survey is a method of through the determination of ship’s average draft corresponding to the difference in value of displacement before and after unloading,deduct other load weight and calculate the amount of dead weight.The method is usually as the measurement of the major bulks,such as coal,ore,fertilizer and so on.The paper mainly does the research on how to get the position of the waterline using image processing technology,which is not easy for human eye. According to the characteristics of draft image acquisition,the paper adopts climbing robot as the carrier of image acquisition device.The paper adopts algorithm processing draft image based on morphological,projection and image segmentation.In order to improve the measurement precision,using the high resolution image acquisition device.For reducing the volume of the following-up processing,the paper firstly take the binary segmentation to get the characters area of high brightness,and projection statistics in the height of image direction,then extract the recent "M"character area from waterline and tilt correction,next segment the "M"regional and identify the digital before the "M"Segmentation and recognition the small character below the "M"and determined the character which is nearest from the waterline.In order to prevent the shape of ship influence the size of characters,we could use the number of pixels for measure standers,the "M"characters or the digital which is nearest from the waterline and recognition.Clipping the color image with a boundary that is the bottom edge of identified digital.And then segmenting the color image and extracting the longest boundary and fitting the waterline position.According to the characteristics of the draft character,we carried out a full image pretreatment process, including the character segmentation,tilt correction and image clipping,whichhas good processing and recognition effect.Then using the color image segmentation determine the position of the waterline. Finally, calculating draft data according to the recognition results of the digital before the "M" area, measurement standard and the position of waterline using the draft survey regulations.After the multiple experiments on many images, it is proved that this method is effective and realizing the ship’s automatic draft survey system is feasible.