1. matlab 自带含 ground truth 数据集
%% 加载停车标志数据到内存；
data = load('stopSignsAndCars.mat', 'stopSignsAndCars');
stopSignsAndCars = data.stopSignsAndCars;
% 将 stopSignsAndCars 下的图像名，拓展为绝对路径加图像名，以方便读取
imagePath = fullfile(toolboxdir(
'vision'),
'visiondata');
stopSignsAndCars.imageFilename = fullfile(imagePath, stopSignsAndCars.imageFilename);
summary(stopSignsAndCars)
% 查看该数据集的主要描述信息，主要标注了 stop sign，car rear：车尾，car front：车头
stopSignsAndCarRears = stopSignsAndCars(
:, {
'imageFilename',
'stopSign',
'carRear'});
% 使用已给的标注信息，对其中一副图像进行标注
I = imread(stopSignsAndCarRears.imageFilename{
1});
I = insertObjectAnnotation(
I,
'rectangle', stopSignsAndCarRears.stopSign{
1},
'stop sign',
'linewidth',
4,
'color',
'r');
I = insertObjectAnnotation(
I,
'rectangle', stopSignsAndCarRears.carRear{
1},
'car rear',
'linewidth',
4,
'color',
'g');
imshow(
I)
