**4.2.5 Describing shape**

Shape and size are inseparable in a physical object, and both are generally necessary if the object is to be satisfasfactoriliy described. Further, in defining the shape some dimensinoal parameters of the object must be measured. Seeds, grains, fruits and vegetables are irregular in shape because of the complexity of their specifications, theorically requires an infinite number of measurements (Fig. 10.). The number of these measurements increases with increase in irregularity of the shape (Mohsenin, 1970).

Local coordinates and individuals features of the pixels are important for some applications and neigbour pairs are the easiest way to identify differences between the products. The histogram of the distributions of this features gives the the answers. Fig. 8. shows

distribution of features at measurement of rice grains by using Matlab Software.

Fig. 8. Measurement of rice grains by using Matlab Software (Anonymous, 2011d).

The perimeter of a feature is a welldefined and familiar geometrical parameter. Measuring a numerical value that really describes the object and these value turns to be easy to determine agricultural products perimeter measurement. Some systems estimate the length of the boundary around the object by counting the pixels but some of them use picture selection method which is based on the selection of the objects manually from images, for

Shape and size are inseparable in a physical object, and both are generally necessary if the object is to be satisfasfactoriliy described. Further, in defining the shape some dimensinoal parameters of the object must be measured. Seeds, grains, fruits and vegetables are irregular in shape because of the complexity of their specifications, theorically requires an infinite number of measurements (Fig. 10.). The number of these measurements increases with

**4.2.3 Neighbor relationships** 

**4.2.4 Perimeter** 

investigating perimeter value (Fig. 9.).

increase in irregularity of the shape (Mohsenin, 1970).

**4.2.5 Describing shape** 

Fig. 9. Measurement of apple perimeter (Selection method) by using Myriad Image Analysis Software.
