How to reduce noise from technical drawings?

asked 2019-01-09 21:40:46 -0600

hoang anh tuan
118 ●5 ●8 ●15

I receive some technical drawings from my co-worker. It is scanned. Some lines in that have noise as the following image:

image description

My expected results:

image description

All above image i have applied bilateral blur. (if not apply, received results are not good to do something)

Please show me some idea/solution to get my expected result.

Thank you so much!

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answered 2019-01-10 06:36:40 -0600

VxW
709 ●1 ●9

Hi,

interesting problem and I think using morphological operations would not work here.

I don't know if it could work but I would define some Haar-Features (see here) to detect the noise. If noise is detected take a template (could also look like a Haar Feature, e.g perfekt vertical line) and replace the detected region with the template. For this, you will need for different Haar-Features different corresponding templates.

Best