I have a scanned raster image containing contours and rivers. I am trying to use qgis to extract these contour and river polylines for analysis. As a start I was thinking of the following process based on the properties of the file: - making image bitonal - sharpening of narrowing scanned lines - connecting broken lines - removing unwanted scanned text - converting remaining lines to contour lines

can someone assist me on how the above can be accomplished in Qgis?

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