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How can I increase contrast in binary picture?(python)

I'm really new to opencv. This is my picture and as you can see the lines in the bottom left corner are faded. I tried threshholding and dilation but it deformed the lines. image description

How can I increase contrast in binary picture?(python)

I'm really new to opencv. This is my picture and as you can see the lines in the bottom left corner are faded. I tried threshholding and dilation but it deformed the lines. image description (edited) original pic:

image description