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pages.zh/common/pnmpsnr.md
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pages.zh/common/pnmpsnr.md
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# pnmpsnr
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> 计算两幅图像之间的差异。
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> 更多信息:<https://netpbm.sourceforge.net/doc/pnmpsnr.html>。
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- 计算两幅图像之间的差异,即峰值信噪比(PSNR):
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}}`
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- 比较图像的颜色分量,而不是亮度和色度分量:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -rgb`
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- 以比较模式运行,即仅输出 `nomatch` 或 `match`,具体取决于计算的 PSNR 是否超过 `n`:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -target {{n}}`
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- 以比较模式运行并比较各个图像分量,即 Y、Cb 和 Cr,与相应的阈值进行比较:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -target1 {{threshold_Y}} -target2 {{threshold_Cb}} -target3 {{threshold_Cr}}`
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- 以比较模式运行并比较各个图像分量,即红色、绿色和蓝色,与相应的阈值进行比较:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -rgb -target1 {{threshold_red}} -target2 {{threshold_green}} -target3 {{threshold_blue}}`
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- 生成机器可读的输出:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -machine`
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