Irregular Objects. Shape Detection and Characteristic Sizes

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