Determination of portrait against back light

Details Determination of portrait against back light Determination of portrait against back light

2004-05-14

2009-08-04

Wu, Jingge (Department: 2624)

Image analysis

Image transformation or preprocessing

Measuring image properties

C382S168000

Reexamination Certificate

active

07570840

ABSTRACT:
A CPU200compares a luminance distribution characteristic of image data with a reference luminance distribution characteristic, and then confirms that the image data GD is a backlit portrait image data if similarity degree Sv between the luminance distribution characteristic of image data and the reference luminance distribution characteristic is larger than reference similarity degree Svref The CPU200determines whether an outer dark portion ratio Do is larger than a reference dark portion ratio Doref. If the CPU200determines that the outer dark portion ratio Do is larger than the reference dark portion ratio Doref, then it determines whether an outer bright portion ratio Bo is larger than a reference bright portion ratio Boref. If the CPU200determines that the outer bright portion ratio Bo is larger than a reference bright portion ratio Boref, then it determines that the image data GD is image data of backlit portrait image.

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