US 7,734,114 B1 · Intelligent saturation of video data

Abstract

The intelligent saturation controller calculates the exact maximum saturation any valid YCbCr pixel can undergo before it becomes invalid in RGB space. The controller models the saturation operation in RGB color space and calculates the maximum saturation level at which the RGB values falls outside the valid range. The saturation operation is performed independently for every pixel of the incoming video frame and ensures that each output pixel is a valid. The controller finds the maximum saturation for each input pixel and checks whether it is less than the input saturation factor. If so, then this calculated maximum saturation value is applied. If not, the input saturation factor is applied. Accordingly, the output RGB pixels are valid and no clamping is necessary if no other video processing is done in YCbCr space. Increasing the saturation of the video signal results in a more vivid and more colorful picture.

Claims30

Dependent claims

A method for processing an input pixel of an image frame, the method comprising:

receiving an input pixel having hue, saturation, and luminance information;
determining a luminance value and a saturation value of the input pixel;
calculating a maximum saturation value based on a color component value of the input pixel at which all color component values of the input pixel are within a valid color component range, wherein the maximum saturation value is a minimum of (1) a first saturation value based on a minimum color component value of the input pixel and the luminance value, and (2) a second saturation value based on a maximum color component value of the input pixel and the luminance value;
adjusting the determined saturation value to the maximum saturation value such that the hue and luminance of the input pixel is preserved;
and
providing an output pixel having the adjusted saturation value.

3 more elements

Dependencies are inferred from the claim text.

Intelligent saturation of video data

Life of this patent

Intelligent saturation of video data

Life of this patent

Abstract

Claims30