How to filter out the white region in BW image and plot a cross on the white square region of a mosaic image

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Ivan MO
Ivan MO 2020-3-31
Hi guys! Stay home and stay safe!
I have a mosaic black and white picture as attached (image1). I want to filter out the white region and plot a cross on each square tiles of image just like ploting a red cross on image2. How can I do that??
image1
image2

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