The Research On The Vector About The Scanned Curve Drawing

In the water pump computer shaping software either in the water pump expert system development, needs to use the water pump performance diagram of curves to determine that needs pump's model or studies water pump's working condition. The water pump performance curve, is a group of data which tests through the experiment draws up according to this water pump in the laboratory. Regarding the majority model's water pumps, must obtain its complete primitive empirical datum not to be easy. Therefore, gains the above data according to the existing paper water pump performance diagram of curves, and fits in the computer, solves this kind of question one method.Regarding the paper water pump performance diagram of curves, the former people are through the way which estimates reads gain these information, although is simple, but reads the precision and the reliability need to come under the very tremendous influence. Along with the computer graphics, computer technical and so on imagery processing, pattern recognition and artificial intelligence development, as well as the image input-output device's massive appearances,"the scanning - digitization - fitting"becomes solves this kind of question quite good method. This article main research water pump performance curve scanning pattern and so on a kind of curve scanned picture arrow quantification question.1. Through processing and so on binaryzation - filtration - smooth - adjustment, have completed the curve scanning pattern arrow quantification pretreatment work. Regarding the scanning gain's water pump performance diagram of curves, through compares each binaryzation method the good and bad points, the union curve image the characteristic, this article uses the overall situation threshold value law, the use repetitive process determination best threshold value, completes the curve scanning pattern binaryzation processing; In order to reduce the noise jamming, this article uses one kind based on mathematics morphology noise filtration method, carries on the noise filtration to the binaryzation image, and designed four kinds to carry on the smooth mathematics morphology template operator to the curve scanned picture, carried on smooth processing after the noise filtration's image; Regarding because scans, the paper to place the scanned picture incline phenomenon which and so on reasons do not produce, this article transformed based on Hough, has studied the curve scanned picture correction for grade method. 2. Proposed does not pass through the refinement, based on center of mass template matching block letter digital recognition algorithm. The union graph image's scale division distributed unique feature, is divided the region to carry on recognition processing to the coordinate scale, after and has given the recognition further revision method. Has completed the coordinate scale digital recognition and the position localization.3. Proposed based on the point of intersection extraction coordinate line extraction algorithm. Through the extraction curve graph image's in coordinate line, the success separates in the image the coordinate line and the curve. Good solution branch point of intersection distortion, branch region overlap as well as long branch point of intersection region and curve distribution crowded and so on questions.4. Has used with the template matching refinement algorithm, carries on single picture element refinement processing regarding the image in curve part, good retention curve central skeleton.5. Has used based on the slope curve track method, has realized the curve arrow quantification recognition.6. Uses the method partition which two points close on to fit and to redraw the curve, the good solution higher order fitting easy to have had the curve shake, the low-order fitting satisfies the request with difficulty the question, also increased the fitting precision.The experimental result indicated that used the above processing technology, the water pump performance curve restoration speed and the precision had the very great degree enhancement.