Procesamiento basado en ROI

Defina y procese regiones de interés (ROI)

Una región de interés (ROI) es una parte de una imagen que se desea filtrar o procesar de alguna manera. Una ROI se puede representar como máscara binaria. En la máscara, los píxeles que pertenecen a la ROI tienen el valor 1, y los que se sitúan fuera tienen el valor 0. La toolbox ofrece varias opciones para especificar una ROI y crear máscaras binarias.

La toolbox es compatible con distintos objetos que pueden usarse para crear ROI de distintas formas, como círculos, elipses, polígonos, rectángulos y formas trazadas a mano alzada. Después de crear los objetos, puede cambiar su forma, posición, apariencia y comportamiento. Para obtener más información sobre las formas que se pueden usar para definir una ROI, consulte Crear formas para definir ROI.

Funciones

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Representar ROI como formas geométricas

`AssistedFreehand`	Assisted freehand region of interest
`Circle`	Circular region of interest
`Crosshair`	Crosshair region of interest
`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

Crear formas para definir ROI

`drawassisted`	Create customizable freehand ROI with assistance from object edges
`drawcircle`	Create customizable circular ROI
`drawcrosshair`	Create customizable crosshair ROI
`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`	Crear una ROI rectangular personalizable

Personalizar las formas de las ROI

`draw`	Iniciar dibujo de ROI de forma interactiva
`reduce`	Reduce density of points in ROI
`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

Crear una máscara a partir de una región de interés

`createMask`	Crear una imagen de máscara binaria a partir de una ROI
`roipoly`	Especificar una región de interés (ROI) poligonal
`poly2mask`	Convertir un polígono de región de interés (ROI) en una máscara de región

Filtrar una imagen mediante una región de interés

`regionfill`	Rellenar regiones especificadas de una imagen utilizando la interpolación interior
`inpaintCoherent`	Restore specific image regions using coherence transport based image inpainting
`inpaintExemplar`	Restore specific image regions using exemplar-based image inpainting
`roicolor`	Select region of interest (ROI) based on color
`roifilt2`	Filtrar una región de interés (ROI) en una imagen
`reducepoly`	Reduce density of points in ROI using Ramer–Douglas–Peucker algorithm

Temas

Especificar ROI

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.
Crear formas para definir ROI
Los objetos de ROI representan las ROI como formas geométricas y trazadas a mano.
Crear una máscara binaria utilizando una función ROI
En este ejemplo se muestra cómo crear una máscara binaria usando una de las funciones de creación de ROI, tales como drawcircle, con la función de creación de máscaras createMask.
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.

Filtrar ROI

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.

Crear ROI interactivas con eventos y funciones de callback

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.

Ejemplos destacados

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.

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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.

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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.

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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.

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