自行车数据集，手工精细标注，里面包含图片和xml文件

<annotation> <folder>TUGraz_bike</folder> <filename>bike_320.png</filename> <path>G:\VOC2005_1\PNGImages\TUGraz_bike\bike_320.png</path> <source> <database>Unknown</database> </source> <size> <width>640</width> <height>480</height> <depth>3</depth> </size> <segmented>0</segmented> <object> <name>bicycle</name> <pose>Unspecified</pose> <truncated>1</truncated> <difficult>0</difficult> <bndbox> <xmin>423</xmin> <ymin>106</ymin> <xmax>640</xmax> <ymax>409</ymax> </bndbox> </object> <object> <name>bicycle</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>102</xmin> <ymin>71</ymin> <xmax>409</xmax> <ymax>376</ymax> </bndbox> </object> <object> <name>bicycle</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>335</xmin> <ymin>47</ymin> <xmax>538</xmax> <ymax>214</ymax> </bndbox> </object> <object> <name>bicycle</name> <pose>Unspecified</pose> <truncated>1</truncated> <difficult>0</difficult> <bndbox> <xmin>1</xmin> <ymin>73</ymin> <xmax>261</xmax> <ymax>318</ymax> </bndbox> </object> </annotation>