【正文】 case 0xbd: key=6。 break。 case 0x7d: key=7。 break。 } while(temp!=0xf0) { temp=P2。 temp=tempamp。0xf0。 num=num1。 num=numamp。amp。key。 } } } P2=0xfb。 temp=P2。 temp=tempamp。0xf0。 if(temp!=0xf0) { delay(10)。 if(temp!=0xf0) { temp=P2。 switch(temp) { case 0xeb: key=8。 break。 } temp=P2。 temp=tempamp。0xf0。 num=num1。 num=numamp。amp。key。 } } } }}void main(){ init()。 key1()。 while(1) { read_adxl()。 read_a3210e()。 if((flag1)||(flag2)||(flag3)) { init_()。 send()。 } } }}void time0() interrupt 1{ TH1=(65536100)/256。 TL1=(65536100)/256 TH0=(65536100)/256。 TL0=(65536100)/256。 i++。}英文原文Length Measurement for Moving Products on Conveyor BeltAkihiro Watanabe， Takanori Yamazaki ， Hideo Ohnishi， Masaaki Kobayashi ， Shigeru Kurosu Utsunomiya University， 350 Minemachi， Utsunomiya， 3218505 Japan Oyama National College of Technology， 771 Nakakuki， Oyama， 3230806 Japan， yama@ Shinko Co.， 421971 Takasai， Shimotsuma， 3040031 Japan Reserach Inst.，Crotech， 6188 Ozakata， Chikusei， 3080854 JapanAbstract: This paper presents an entirely new method which achieves precise length measurement of products on conveyor belt at high speed. Recently， the automatic length measurement of products in motion is ing to assume greater importance in industrial fields. Then， making the best use of the conventional length measurement on a conveyor， we propose a new length estimation method for moving products with a digital image taken by a handy digital camera. In the previous paper， we gave a brief explanation of the length measurement with a digital image and pointed out some technical problems in obtaining lengths with high accuracy. In this paper， we demonstrate the result of applying our method to real data of digital images having different dimensions. In particular， the interest is centered on an estimation method of the length of products making a slanting angle with the fixed direction of a conveyor.KeyWords: Length measurement， Digital image， Moving product， Belt conveyor1. INTRODUCTIONIn recent years， many studies on mass and length measurement of moving products on a conveyer belt have been made energetically in distribution and food Industries. In the mass and length measurement of products on a conveyor belt， the dimension and mass of products are generally random. Long， short， high， low heavy and light products are passed over a conveyor belt at a highspeed.Through previous papers on multistage conveyor belt scales， the continuous weighing method has been established with satisfactory performance. In the multistage conveyor belt scales so far presented， not only a mass of a product， but also a length of the product should be measured with accuracy demands. The length measurement of moving products has been still remained unsolved.Our aim is to establish a highly accurate length measurement of moving products with a digital image taken by a handy camera. Of particular interest on the road to us is how to estimate the length of rectangular products making a slanting angle with the fixed direction of a conveyor.2. LENGTH MEASUREMENTThe fundamental configuration of the length measurement system with a digital camera may be represented schematically as shown in Fig. 1. Specifications of products are length: 100~1200 mm， width: 100~ 900 mm， height: 30~900 mm， and color: not specified. A product to be measured is transported from an input side conveyor (right) into a multistage conveyor having a length of 1400 mm and after measurement the product is transported onto an output side conveyor(left). The transportation speed ranges from 20 m/min to 80 m/ min. And the accuracy of length 177。5 mm is required. A digital image consists of a set of dots， called “pixels”， and constitutes 22401488 pixels. For convenience， the colors of a product and background are chosen as white and black to make the border line between a product and background clear. The grade between light and shade is classified to 8 bits (256 gradation) for one pixel. The grade “0” means deep black， and“255” does pure white. In our image processing unit， the number of pixels of greater than 60 gradations is counted as“white”. The digital image taken by a digital camera constitutes22401488 pixels defined by the number of the vertical pixels and the horizontal pixels are pV and pH， respectively. Basically， an estimated length can be obtained multiplying the counted number of pixels by the reference unit pixel. If you need to know the exact explanations， please refer to our previous report (1).3. MEASURING METHOD Fig. 2 shows an example of digital images of slanting products that is 600 mm in length and 400 mm in width， Fig. 3 shows the diagrammatic illustration to explain measuring method of a rectangular product. The positions of points and the variables in Fig. 2 are given by，xa， ya: xy coordinate values on upper line on left side of a product (number of pixels)，xcs， ycs: xy coordinate values on center line on left side of a product，xcf， ycf: xy coordinate values on center line on right side of a product，xl， yl: xy coordinate values on lower line on left side of a product，sx: x span (sx = xlxa)，sy: y span (sy = ylya)，θ: slanting angle (the angle between the long edge of product and the horizontal