Image processing apparatus, image processing method, and program

An image processing method, comprising:

• by an image processing apparatus configured to process an input image
• determining a depth adjustment amount of an input image;
• determining an input-value adjustment amount based on an evaluation function, the evaluation function representing a relationship of a subjective depth amount to a color-saturation component of the image, the subjective depth amount being a depth amount subjectively felt by a user, the input-value adjustment amount representing a retina's response to the color-saturation component corresponding to the determined depth adjustment amount;
• calculating each spatial-frequency-component adjustment gain based on the determined input-value adjustment amount;
• and
• superimposing each of the calculated spatial-frequency-component adjustment gains on the color-saturation component of the input image.

At least one non-transitory computer-readable storage medium having encoded thereon executable instructions that, when executed by at least one processor, cause the at least one processor to carry out a method comprising:

• determining a depth adjustment amount of an input image;
• determining an input-value adjustment amount based on an evaluation function, the evaluation function representing a relationship of a subjective depth amount to a color-saturation component of the image, the subjective depth amount being a depth amount subjectively felt by a user, the input-value adjustment amount representing a retina's response to the color-saturation component corresponding to the determined depth adjustment amount;
• calculating each spatial-frequency-component adjustment gain based on the determined input-value adjustment amount;
• and
• superimposing each of the calculated spatial-frequency-component adjustment gains on the color-saturation component of the input image.