输入: signature.png
模式: RGBA  尺寸: (1820, 510)
参数: is_sig=True height_cm=1 noise=0 rotate=[0,0] dpi=96
阈值: alpha>30  亮度<210  二值化>128  白底>240
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[00] original           size=(1820, 510)    alpha=  2.1%  dark=100.0%  content=  2.1%  bbox=(400, 105, 1022, 461)
[01] binarized          size=(1820, 510)    alpha=100.0%  dark=100.0%  content=100.0%  bbox=(0, 0, 1820, 510)
[02] white_removed      size=(1820, 510)    alpha=100.0%  dark=100.0%  content=100.0%  bbox=(0, 0, 1820, 510)
[03] border_cropped     size=(1820, 510)    alpha=100.0%  dark=100.0%  content=100.0%  bbox=(0, 0, 1820, 510)
[04] scaled             size=(132, 37)      alpha=100.0%  dark=100.0%  content=100.0%  bbox=(0, 0, 132, 37)
[05] noised             SKIPPED
[06] rotated            SKIPPED
[07] final_cropped      size=(132, 37)      alpha=100.0%  dark=100.0%  content=100.0%  bbox=(0, 0, 132, 37)
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最终输出: final.png  size=(132, 37)