findView

Find views associated with view identifiers

Syntax

views = findView(vSet,viewIds)

Description

views = findView(vSet,viewIds) finds the views associated with the specified view viewIds and returns the view attributes.

Examples

Find View Corresponding to View ID

Create an empty image view set.

vSet = imageviewset;

Add two images.

imageDir = fullfile(toolboxdir('vision'),'visiondata', ...
  'structureFromMotion');
I1 = rgb2gray(imread(fullfile(imageDir,'image1.jpg')));
I2 = rgb2gray(imread(fullfile(imageDir,'image2.jpg')));

Detect interest points in the two images

points1 = detectSURFFeatures(I1);
points2 = detectSURFFeatures(I2);

Extract features descriptors from the detected points.

[features1,validPoints1] = extractFeatures(I1,points1);
[features2,validPoints2] = extractFeatures(I2,points2);

Add the points to the imageviewset object.

vSet = addView(vSet,1,'Features',features1,'Points',validPoints1);
vSet = addView(vSet,2,'Features',features2,'Points',validPoints2);

Find the view that corresponds to viewID equal to 1.

view = findView(vSet,1)

view=1×4 table
    ViewId    AbsolutePose       Features              Points      
    ______    ____________    _______________    __________________

      1       1x1 rigid3d     {574x64 single}    {574x1 SURFPoints}

Check the feature points that correspond to viewID equal to 1.

view.Points{:}

ans = 
  574x1 SURFPoints array with properties:

              Scale: [574x1 single]
    SignOfLaplacian: [574x1 int8]
        Orientation: [574x1 single]
           Location: [574x2 single]
             Metric: [574x1 single]
              Count: 574

Input Arguments

vSet — Image view set

imageviewset object

Image view set, specified as an imageviewset object.

viewIds — View identifier

M-element vector

View identifiers, specified as an M-element vector of integers. Each view identifier is unique to a specific view.

Output Arguments

views — View attributes

four-column table

View attributes, returned as a four-column table. The table contains the columns ViewId, AbsolutePose, Features, and Points attribute descriptions.