手远离屏幕打印z轴.log

根据
https://blog.csdn.net/u011984148/article/details/115388524

(2) 手部关节点坐标(x,y,z)输出为小于1的小数，需要归一化后显示到图像上，这部分可以查看上部分源码后转到定义查看，
这里给出demo代码，另外Z坐标靠近屏幕增大，远离屏幕减小：

原文应该是公众号的 
opencv与ai深度学习
https://page.om.qq.com/page/OYlOwj5Ayc_OAm-ZW5KdTXRA0


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-0.045725300908088684
Index finger tip coordinates: ( 339.23240661621094, 245.43105125427246)
=================
-1.76179273694288e-05
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-0.030875902622938156
-0.03750251606106758
Index finger tip coordinates: ( 339.3539047241211, 246.2303638458252)
=================
-1.4635454135714099e-05
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-0.004831621423363686
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0.003937504719942808
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Index finger tip coordinates: ( 342.65819549560547, 252.75870323181152)
=================
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Index finger tip coordinates: ( 356.63108825683594, 271.1733055114746)
=================
-1.8684997485252097e-05
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Index finger tip coordinates: ( 368.551025390625, 289.7156810760498)
=================
-2.6962945412378758e-05
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-0.00936319213360548
Index finger tip coordinates: ( 368.8548278808594, 298.8584804534912)
=================
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Index finger tip coordinates: ( 372.9513168334961, 293.2436943054199)