ROI 기반 처리

ROI(관심 영역)를 정의하고 이에 대해 연산 수행

ROI(관심 영역)는 필터링하거나 어떤 식으로든 연산을 수행하려는 영상의 부분입니다. ROI를 이진 마스크 영상으로 표현할 수 있습니다. 마스크 영상에서 ROI 내부에 있는 픽셀은 1로, ROI 외부에 있는 픽셀은 0으로 설정됩니다. 툴박스는 ROI를 지정하고 이진 마스크를 생성하는 여러 옵션을 제공합니다.

툴박스는 원, 타원, 다각형, 직사각형, 손으로 그린 형태 등 여러 형태의 ROI를 만드는 데 사용할 수 있는 일련의 객체를 지원합니다. 객체를 만든 뒤에는 형태, 위치, 모양, 동작을 수정할 수 있습니다. ROI 형태에 대한 자세한 내용은 ROI 형태 만들기 항목을 참조하십시오.

함수

모두 확장

ROI를 기하 형태로 표현하기

`AssistedFreehand`	Assisted freehand region of interest
`Circle`	Circular region of interest
`Crosshair`	Crosshair region of interest (R2019b 이후)
`Cuboid`	Cuboidal region of interest
`Ellipse`	Elliptical region of interest
`Freehand`	Freehand region of interest
`Line`	Line region of interest
`Point`	Point region of interest
`Polygon`	Polygonal region of interest
`Polyline`	Polyline region of interest
`Rectangle`	Rectangular region of interest

ROI 형태 만들기

`drawassisted`	Create customizable freehand ROI with assistance from object edges
`drawcircle`	Create customizable circular ROI
`drawcrosshair`	Create customizable crosshair ROI (R2019b 이후)
`drawcuboid`	Create customizable cuboidal ROI
`drawellipse`	Create customizable elliptical ROI
`drawfreehand`	Create customizable freehand ROI
`drawline`	Create customizable linear ROI
`drawpoint`	Create customizable point ROI
`drawpolygon`	Create customizable polygonal ROI
`drawpolyline`	Create customizable polyline ROI
`drawrectangle`	Create customizable rectangular ROI

ROI 형태 사용자 지정하기

`draw`	대화형 방식으로 ROI 그리기 시작
`reduce`	Reduce density of points in ROI (R2019b 이후)
`beginDrawingFromPoint`	Begin drawing ROI from specified point
`inROI`	Query if points are located in ROI
`bringToFront`	Bring ROI to front of Axes stacking order
`wait`	Block MATLAB command line until ROI operation is finished (R2019b 이후)

ROI에서 마스크 만들기

`createMask`	ROI에서 이진 마스크 영상 만들기
`roipoly`	다각형 관심 영역(ROI) 지정
`poly2mask`	관심 영역(ROI) 다각형을 영역 마스크로 변환

ROI를 사용하여 영상 필터링하기

`regionfill`	안쪽 보간을 사용하여 영상에서 특정 영역 채우기
`inpaintCoherent`	Restore specific image regions using coherence transport based image inpainting
`inpaintExemplar`	Restore specific image regions using exemplar-based image inpainting (R2019b 이후)
`roicolor`	Select region of interest (ROI) based on color
`roifilt2`	회색조 영상의 관심 영역(ROI) 필터링
`reducepoly`	Reduce density of points in ROI using Ramer–Douglas–Peucker algorithm (R2019b 이후)

도움말 항목

ROI 지정하기

Specify ROI as Binary Mask
You can create a binary mask by selecting pixels based on intensity values or position, or by using binary segmentation techniques.
ROI 형태 만들기
ROI 객체는 ROI를 기하 형태 및 손으로 그린 형태로 나타냅니다.
ROI 함수를 사용하여 이진 마스크 만들기
이 예제에서는 drawcircle과 같은 ROI 생성 함수 중 하나를 마스크 생성 함수 createMask와 함께 사용하여 이진 마스크를 만드는 방법을 보여줍니다.
Classify Pixels That Are Partially Enclosed by ROI
Learn how many Image Processing Toolbox™ functions classify pixels that are only partially within the boundaries of a region of interest.

ROI 필터링하기

Overview of ROI Filtering
To filter a region of interest (ROI), first define a mask to separate the ROI from the background, then apply the filter to the ROI only.
Sharpen Region of Interest in an Image
This example shows how to use masked filtering to increase the sharpness of a specific region of interest.
Apply Custom Filter to Region of Interest in Image
This example shows how to define your own function and mask to filter a region of interest.
Fill Region of Interest in an Image
The process of filling a region of interest involves replacing all pixels in the region by interpolating inward from the boundary of the region.

이벤트 및 콜백 함수를 사용하여 대화형 방식 ROI 만들기

Subsample or Simplify a Freehand ROI
This example shows how to subsample or reduce the number of points in a Freehand ROI object.
Rotate Image Interactively Using Rectangle ROI
This example shows how to rotate an image by using a Rectangle ROI with a callback function that calls imrotate when you move the ROI.
Use Polyline to Create Angle Measurement Tool
This example shows how to create an interactive tool that displays the angle between three vertices in a polyline ROI.
Measure Distances in an Image
This example shows how to use line ROIs to measure distances in an image.
Use Wait Function After Drawing ROI
This example shows how to define a custom wait function that blocks the MATLAB® command line until you finish positioning a rectangle.

추천 예제

Use Freehand ROIs to Refine Segmentation Masks

Refine a logical segmentation mask by converting it into a Freehand ROI object. In this method, you take advantage of the interactive reshaping capability of the Freehand ROI object to make a better fit of the edge of the segmentation mask to the shape of the image region that you want to segment.

라이브 스크립트 열기

Create Image Comparison Tool Using ROIs

Use the new ROI functions to create an interactive image comparison tool. When working with images, we often need to assess visually the impact a function has on an image. Some effects are clearly distinguishable, like an edge filter. But some impacts are more subtle and need closer inspection.

스크립트 열기

Create Freehand ROI Editing Tool

Create a simple tool to edit the shape of a freehand ROI using another ROI object. By default, Freehand ROI objects include waypoints that you can click and drag to adjust the shape of the ROI. You can also add waypoints interactively to any part of the boundary.

스크립트 열기

Interactive Image Inpainting Using Exemplar Matching

Interactively select image regions and inpaint the selected regions by using the exemplar based-matching method. Interactive inpainting allows you to select a region multiple times and perform inpainting iteratively to achieve the desired results.

라이브 스크립트 열기