Abstract: An adaptive pre-processing technique is provided to reduce perceptually unimportant information in a frame (such as some of the high frequency information) so as to optimize compression efficiency and to maximize perceived video quality of a compressed video sequence for a given bit rate. This pre-processing includes a combination of performing pre-filtering of video data to remove high frequency components and to smooth out high frequency texture information within object boundaries, based at least in part on human visual system characteristics. The technique is adaptive in that feedback regarding the current state of the encoder is used to change the filtering strength or region of support for subsequent frames, as needed, in order to maintain the bit budget while still generating visually acceptable video quality.

Abstract: Methods and apparatus, including computer program products, implementing and using techniques for defining a color gradient to be applied to a region. A gradient starting point is defined, a gradient ending point is defined, at least one intermediary point between the gradient starting point and the gradient ending point is defined, and a set of gradient attributes is defined. A first and a second set of values are defined for the set of gradient attributes, the first set of values defining a transition between the gradient starting point and the at least one intermediary point, and the second set of attribute values defining a transition between the at least one intermediary point and the gradient ending point. The first and second set of values are distinct.