Correct the index for LoG filters.#2

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qilin512 wants to merge 3 commits intotonyjo:masterfrom

qilin512:master

Commits on Nov 16, 2022

correct "*" to "**" in scalex and scale, flip y meshgrid, and add function "normalize". The results are now identical to the original Matlab code.
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format the code a bit
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Commits on Dec 2, 2022

correct the index for the LOG filters
qilin512
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