International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
3.3 Experimental Results 
For each image, it is exactly key that the projected line is 
extracted from this image. In the experiment, the curve is 
extracted out by the image processing skill. According to the 
characteristic of the image and the regulation of the coordinates 
movement of the extracted curve, the section of the curve on 
the body of the convenient cup is separated from the whole 
curve. For example, the experiment processes the first image in 
the Figure 2. The experimental results are shown as two images 
of the Figure 3. 
| 
Figure 3. The whole curve and the section of the curve 
The points on the section of the extracted curve are available 
for the next calculation. The coordinates of these points are 
expressed by the unit of pixel. There are separately 284 points, 
294 points, 297 points and 249 points in the first image, the 
second image, the third image and the fourth image of Figure 2. 
Every point on the four sections of the curve has its own 
homologous point on the line of the projected slide through the 
homologous epipolar lines. So the space coordinates of four 
sets of space points can be computed out by the space forward 
intersection. The two end points of each set of the space points 
is picked out and their coordinates are used in the whole 
adjustment. The results of the whole adjustment are shown in 
the Table 1. 
  
X, (mm) R, (mm) | H (mm) 
Yo (mm) 
  
-0.0954 5.7235 23.9147 80.7226 
  
  
  
  
  
  
  
Table 1. The results of the whole adjustment 
(x) Vp) is the coordinates of the centre of circle. R, is the 
radius of circle of the mouth of the convenient cup and R, is 
the radius of circle of the bottom of the convenient cup. /7 is 
the height of the convenient cup. 
Known the coordinates of the centre axis, there is a radius of 
circle in every horizontal level according to the coordinates of 
the points of the extracted curves. The whole model of the 
convenient cup is made up of many levels of the circles. The 
view of the final model is shown in the Figure 4. 
    
  
    
(c) From lean (d) From top 
Figure 4. The model of the target cup 
4. CONCLUSIONS 
4.1 Achievements of the Paper 
The approach proposed in the paper is confirmed to be proper 
and applicable from the results of the experimental data. This 
approach only requires a digital camera, an ordinary slide 
projector and a rotating platform. These equipments are easy to 
be ready for the applications. 
The paper also deduces the detail algorithm of this approach 
which is understandable and relatively simple. Using the 
algorithm provided, the correct model results can be gotten 
from the image data. To sum up, the approach with this 
algorithm is effective and effectual. 
According to the size of the object, the distance of the slide 
projector from the rotating platform and the point density of the 
slide can be changed and adjusted, so that this approach is 
suitable for many kinds of applications. Moreover, it is hardly 
affected by the space factor or time factor. The approach 
provided by the paper is flexible and practical. 
4.2 Limitations and Future Work 
Because of the tight time and the restricted experimental 
environment, there are a few limitations appearing in this 
approach. 
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intensity of the light of the slide projector, the distance 
from the slide projector to the rotating platform is not too 
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