飞鸟数据集，用于目标检测，里面不仅仅包括鸟类的近照，还包含飞翔的鸟类和鸟群的图片（共4800多张图片+标签）

<annotation> <folder>bird1</folder> <filename>树上的鸟_181.jpg</filename> <path>D:\桌面\鸟\bird1\树上的鸟_181.jpg</path> <source> <database>Unknown</database> </source> <size> <width>736</width> <height>982</height> <depth>3</depth> </size> <segmented>0</segmented> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>79</xmin> <ymin>73</ymin> <xmax>104</xmax> <ymax>120</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>4</xmin> <ymin>136</ymin> <xmax>33</xmax> <ymax>184</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>9</xmin> <ymin>180</ymin> <xmax>39</xmax> <ymax>209</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>106</xmin> <ymin>113</ymin> <xmax>139</xmax> <ymax>155</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>85</xmin> <ymin>179</ymin> <xmax>117</xmax> <ymax>235</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>160</xmin> <ymin>99</ymin> <xmax>185</xmax> <ymax>154</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>244</xmin> <ymin>29</ymin> <xmax>280</xmax> <ymax>95</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>315</xmin> <ymin>19</ymin> <xmax>360</xmax> <ymax>50</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>313</xmin> <ymin>67</ymin> <xmax>341</xmax> <ymax>103</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>286</xmin> <ymin>95</ymin> <xmax>322</xmax> <ymax>146</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>213</xmin> <ymin>102</ymin> <xmax>254</xmax> <ymax>150</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>225</xmin> <ymin>152</ymin> <xmax>259</xmax> <ymax>195</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>127</xmin> <ymin>214</ymin> <xmax>164</xmax> <ymax>264</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>35</xmin> <ymin>246</ymin> <xmax>69</xmax> <ymax>293</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>15</xmin> <ymin>285</ymin> <xmax>51</xmax> <ymax>334</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>10</xmin> <ymin>327</ymin> <xmax>39</xmax> <ymax>381</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>40</xmin> <ymin>363</ymin> <xmax>76</xmax> <ymax>398</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>82</xmin> <ymin>357</ymin> <xmax>118</xmax> <ymax>431</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>186</xmin> <ymin>358</ymin> <xmax>227</xmax> <ymax>428</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>29</xmin> <ymin>471</ymin> <xmax>64</xmax> <ymax>518</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>8</xmin> <ymin>430</ymin> <xmax>37</xmax> <ymax>469</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>8</xmin> <ymin>463</ymin> <xmax>29</xmax> <ymax>509</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>5</xmin> <ymin>540</ymin> <xmax>25</xmax> <ymax>612</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>20</xmin> <ymin>592</ymin> <xmax>50</xmax> <ymax>641</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>61</xmin> <ymin>519</ymin> <xmax>94</xmax> <ymax>574</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>22</xmin> <ymin>656</ymin> <xmax>43</xmax> <ymax>705</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>46</xmin> <ymin>701</ymin> <xmax>76</xmax> <ymax>769</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>89</xmin> <ymin>802</ymin> <xmax>143</xmax> <ymax>871</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>94</xmin> <ymin>634</ymin> <xmax>125</xmax> <ymax>674</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>171</xmin> <ymin>597</ymin> <xmax>197</xmax> <ymax>662</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>207</xmin> <ymin>664</ymin> <xmax>252</xmax> <ymax>720</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>249</xmin> <ymin>699</ymin> <xmax>286</xmax> <ymax>745</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>264</xmin> <ymin>607</ymin> <xmax>313</xmax> <ymax>676</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>406</xmin> <ymin>666</ymin> <xmax>439</xmax> <ymax>727</ymax> </bndbox> </object> <object> <name>bird</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</diff