Methods and device for efficient resampling and resizing of digital images

摘要

Described are a system and method to determine the initial luma and chroma phase such that the resulting image after chroma upsampling and scaling has zero phase difference between the luma and chroma components. Particularly, the described method may include receiving a subsampled input image having luma and chroma values. The method may then perform a phase computation of the input image to determine scaling parameters such that phase differences between all color components of an output image are zero. The method may then include performing a combined upscaling and upsampling process on the input image using the scaling parameters to generate an upscaled image with no phase difference from the subsampled image.

主权项

1. A non-transitory computer-implemented method in a processor, comprising:
receiving a subsampled input image having luma and chroma samples into the processor; determining an initial phase difference between the luma and chroma samples from chroma site information of the subsampled input image; performing a phase computation of the subsampled input image with the processor to determine scaling parameters such that phase differences between all color components of an output image are zero; and concurrently performing, at a general scaler circuit of the processor, upscaling and chroma upsampling on the subsampled input image based on the scaling parameters to generate an upscaled image with no phase difference from the subsampled input image such that the upscaled and upsampled image is not distorted with respect to the subsampled input image.