MATLAB自带的图像处理工具箱如何实现ORB特征提取和匹配

MATLAB自带的图像处理工具箱可以通过以下代码实现ORB特征提取和匹配：

% 读取图像
img1 = imread('image1.jpg');
img2 = imread('image2.jpg');

% 提取ORB特征
points1 = detectORBFeatures(rgb2gray(img1));
points2 = detectORBFeatures(rgb2gray(img2));
[features1, validPoints1] = extractFeatures(rgb2gray(img1), points1);
[features2, validPoints2] = extractFeatures(rgb2gray(img2), points2);

% 进行ORB特征匹配
indexPairs = matchFeatures(features1, features2);
matchedPoints1 = validPoints1(indexPairs(:, 1), :);
matchedPoints2 = validPoints2(indexPairs(:, 2), :);

% 显示匹配结果
figure; showMatchedFeatures(img1, img2, matchedPoints1, matchedPoints2);

其中，detectORBFeatures()函数用于检测ORB特征点，extractFeatures()函数用于提取ORB特征，matchFeatures()函数用于进行ORB特征匹配，showMatchedFeatures()函数用于显示匹配结果。