| 摘要 |
A method and apparatus for comparing colour images independently of the illumination of a subject object in said images comprises: means for receiving image data comprising colour data for a plurality of pixels representing colours in an image; a processing unit for generating a colour reflectance image independent of illumination colour; a comparator operable to compare generated colour reflectance images with stored image data. Said correspondence is determined on the basis of the comparison of ratios of colour data for pixels in the generated colour reflectance image and ratios of colour data in said stored images. The reflectance image may be generated by a Retinex processing algorithm. The colour comparison system may be used in a system for determining gaze direction of a computer operator. |
