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---
title: "An Introduction to Binarisation"
-date: 2019-10-09
-draft: true
+date: 2019-10-22
categories: [binarisation, preprocessing, image manipulation]
---
Binarisation is the process of turning a colour or grayscale image into
@@ -12,6 +11,13 @@ makes various image manipulation tasks much more straightforward. OCR is
one such process, and all major OCR engines today work on binarised
images.
+Poor binarisation has been a key cause of poor OCR results for our work,
+so we have spent some time looking into better solutions to improve our
+results. We now generally pre-binarise page images before sending them
+to an OCR engine, which has yielded significant quality improvements to
+our OCR results. Before we get to that, it's worth looking in depth at
+how different binarisation methods work.
+
Binarisation sounds pretty straightforward, and in the ideal case it is.
You can pick a number, and go through each pixel in the image, checking
if the pixel is lighter than the number, and if so declaring it to be