Multi-color flash with image post-processing

A non-transitory, computer-readable storage medium storing computer-readable instructions operable, when the instructions are executed on a processor, to:

• retrieve a first image of a scene taken by a camera while the scene is being illuminated with a first set of light sources, the first set of light sources for causing the first image to be associated with a first color point;
• retrieve a second image of the scene taken by the camera while the scene is being illuminated with a second set of light sources, the second set of light sources for causing the second image to be associated with a second color point, different from the first color point;
• obtain a third color point, the third color point associated with the scene not being illuminated with the first set of light sources and not being illuminated with the second set of light sources, each of the first color point, the second color point, and the third color point having a respective location in a plot having a first axis and a second axis, the first axis indicating values of a ratio of a sum of at least a sub-set of pixel values of a first primary color to a sum of at least a sub-set of pixel values of a third primary color, and the second axis indicating values of a ratio of a sum of at least a sub-set of pixel values of a second primary color to the sum of at least the sub-set of pixel values of the third primary color;
• and
• generate a final image of the scene based on a combination of the first image and the second image by
• computing a correction factor based on at least a value indicative of the location of the first color point, a value indicative of the location of the second color point, and a value indicative of the location of the third color point,
• generating a modified first image by modifying each of pixel values of the first image by a first value based on the correction factor,
• generating a modified second image by modifying each of pixel values of the second image by a second value based on the correction factor, and
• generating the final image based on pixel values of the modified first image and pixel values of the modified second image.

A method for operating a camera device, the method comprising:

• causing a camera to acquire a first image of a scene while the scene is being illuminated with a first set of light sources, the first set of light sources for causing the first image to be associated with a first color point;
• causing the camera to acquire a second image of the scene while the scene is being illuminated with a second set of light sources, the second set of light sources for causing the second image to be associated with a second color point, different from the first color point;
• obtaining a third color point, the third color point associated with the scene not being illuminated with the first set of light sources and not being illuminated with the second set of light sources, each of the first color point, the second color point, and the third color point having a respective location in a plot having a first axis and a second axis, the first axis indicating values of a ratio of a sum of at least a sub-set of pixel values of a first primary color to a sum of at least a sub-set of pixel values of a third primary color, and the second axis indicating values of a ratio of a sum of at least a sub-set of pixel values of a second primary color to the sum of at least the sub-set of pixel values of the third primary color;
• and
• generating a final image of the scene based on a combination of the first image and the second image by
• computing a correction factor based on at least a value indicative of the location of the first color point, a value indicative of the location of the second color point, and a value indicative of the location of the third color point,
• generating a modified first image by modifying each of pixel values of the first image by a first value based on the correction factor,
• generating a modified second image by modifying each of pixel values of the second image by a second value based on the correction factor, and
• generating the final image based on pixel values of the modified first image and pixel values of the modified second image.