Computer Vision

Thresholding
- intensity threshold 에 따라 gray scale image를 binary image로 변환하는 것
- 물체와 배경을 분리할 때 주로 사용(컴퓨터에게는 매우 어려운 일)
Def] Region
A region is a subset of an image
Def] Segmentation(partitioning of an image into regions)
Segmentation is grouping pixels into regions, , such that

1. Entire image

2.

3. Each region satisfies a predicate; that is, all points of the partition have some common property.

4. Pixels belonging to adjacent regions, when taken jointly, do not satisfy the predicate.

※ Predicate의 한 예: uniform intensity.
※ For binary vision, segmentation and thresholding are synonymous.
Thresholding
: original gray scale image
: binary image (: threshold) where
- 밝은 배경에 어두운 물체인 경우

- 물체의 intensity가 사이에 있을 때,

- 일반적인 thresholding scheme:

: a set of intensity values for object components