Normalisasi (pengolahan citra)

Dalam pengolahan citra, normalisasi adalah proses untuk mengganti jangkauan nilai intensitas piksel citra. Kegunaannya antara lain perbaikan foto berkontras rendah akibat terkena sinar berlebih. Normalisasi terkadang disebut dengan perentangan kontras atau perentangan histogram.

Normalisasi adalah pemetaan citra berderajat keabuan berdimensi n dengan rentang nilai [min, maks] ke citra dengan rentang nilai [minBaru, maksBaru].

Normalisasi linear untuk citra berderajat keabuan dilakukan sebagai berikut.

Bila menggunakan fungsi sigmoid, normalisasinya dilakukan sebagai berikut:

dengan adalah jangkauan citra asal dan adalah nilai tengah intensitas citra asal.

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