Irregular objects.Shape detection and characteristic sizes

Nizhny Tagil Technological Institute (branch)of Ural Federal University

Sergey O. BochkarevIgor B. Litus

Natalia S. Kravchenko

Task• Find contour of object on a

picture.• Detect standard shape, in which

it looks like.• Find characteristic sizes

Standard shapes• Rectangle

• Circle

• Rhombus

• Ellipse

Standard shapes

Used technologies• Camera Nikon D800 7360px × 4912px

• C#-based software

• DBMS mysql

• Computer vision library opencv

Used criterion: rectness• Rectness - closeness of contour to rectangle

𝑟𝑒𝑐=𝑆𝑐𝑜𝑛𝑡𝑜𝑢𝑟

𝑆𝑟𝑒𝑐𝑡

Used criterion: circless• Circless - closeness of contour to circle

𝑐𝑖𝑟=𝑆𝑐𝑜𝑛𝑡𝑜𝑢𝑟

𝑆𝑐𝑖𝑟𝑐𝑙𝑒

Used criterion: ellipseness• Ellipseness - closeness of contour to ellipse

𝑒𝑙𝑙=𝑆𝑐𝑜𝑛𝑡𝑜𝑢𝑟

𝑆𝑒𝑙𝑙𝑖𝑝𝑠𝑒

Compactness of standard shapes

Results of detection: generated figures

Results of detection: ragged figures

Results of detection: regular figures

Results of detection: irregular figures