Saturday, December 12, 2009

Voxel

Voxel (volumetric pixel)은 regular grid나 3차원 space에서 값을 표시하는 volume element이다. 이것은 bitmap, 또는 pixmap의 2D image data를 표현하는 pixel과 비슷한다. Bitmap의 pixel과 같이, voxel은 전형적으로 그들의 그들의 값가 같이 명시적으로 encode되어 있는 position, 혹은 coordinate를 가지지 않는다. 대신에, voxel의 position은 다른 voxel과의 상대적으로 추정된다. Pixel과 voxel의 차이점에서는, points와 polygons는 종종 명시적으로 그들의 vertices에 의해 명시적으로 표현된다는 것이다. 이 차이점의 결과로 polygon들은 혀과적으로 간단한 3D 구조를 공백이나 균일하게 채워진 공간으로 표현할 수 있다. 반면 voxel은 균일하지 않게 채워진 규칙적으로 sample된 공간을 표현하는 데 효가ㅗ적이다.

Voxel은 medical와 scientific data의 분석과 visualization에 사용된다. 어떤 volumetric displays는 그들의 해상도를 표현하기위해 voxel을 사용한다. 예를 들어, 어떤 display는 512×512×512 voxel를 표현할 수 있다.

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