LIGHT SOURCE ESTIMATION APPARATUS AND IMAGE PICKUP APPARATUS

摘要

A light source estimating apparatus of embodiments has a sensitivity ratio spatial distribution calculating unit configured to extract a first color pixel and a second color pixel which have close spectral sensitivity and which have different sensor responses from a first picked up image picked up with an image sensor under an arbitrary light source, and calculate a ratio between a signal value of the first color pixel and a signal value of the second color pixel to acquire a first sensitivity ratio spatial distribution, and a similarity determining unit configured to estimate a type of the arbitrary light source based on similarity between a second sensitivity ratio spatial distribution group calculated using a second picked up image picked up with the image sensor under a known light source and the first sensitivity ratio spatial distribution.

主权项

1. A light source estimating apparatus comprising:
a sensitivity ratio spatial distribution calculating unit configured to extract a first color pixel and a second color pixel which have close spectral sensitivity and which have different sensor responses, from a first picked up image picked up with an image sensor under an arbitrary light source, and calculate a ratio between a signal value of the first color pixel and a signal value of the second color pixel to acquire a first sensitivity ratio spatial distribution; and a similarity determining unit configured to estimate a type of the arbitrary light source based on similarity between a second sensitivity ratio spatial distribution group calculated using a second picked up image picked up with the image sensor under a known light source and the first sensitivity ratio spatial distribution.