Backup some figures

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diff --git a/fig/lena_atv.png b/fig/lena_atv.png
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diff --git a/fig/lena_method_tv.png b/fig/lena_method_tv.png
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diff --git a/fig/lenaedge.png b/fig/lenaedge.png
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diff --git a/fig/lenatensor.png b/fig/lenatensor.png
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