this is a sunrgbd toolbox modified based on the official toolbox can
1: crop rgb, depth image accroding to 2dbbox annotation
2: extract rotation matrix and tranlsation vector from SUNRGBDMeta3DBB_v2.mat
3: crop seg.mat according to 2dbbox extraced from SUNRGBDMeta2DBB_v2.mat, but SUNRGBD dont have a corresponding relationship between seg.mat's objects and 2dbbox annotaion, so we cant get a accurate segmentation for every object in image
#next goal:
1.find an elegant way to store the global variables
2.refactoring the whole project
3.divide into more modules