1. An apparatus, comprising: an image signal processor that comprises a noise filtering and image sharpening unit, wherein the image signal processor is configured to: receive, at the noise filtering and image sharpening unit, a luminance value for a pixel of an image frame in a luminance-chrominance encoding; apply, by the noise filtering and image sharpening unit, a spatial noise filtering technique to generate a filtered luminance value for the pixel, wherein spatial support for the spatial noise filtering technique is obtained from one or more line buffers at the image signal processor maintaining a plurality of other pixels of the image frame; sharpen, by the noise filtering and image sharpening unit, a frequency range of the luminance value to generate a sharpened luminance value for the pixel, wherein spatial support to sharpen the frequency range is obtained from the one or more line buffers; and combine, by the noise filtering and image sharpening unit, the filtered luminance value and the sharpened luminance value of the pixel to generate a new version of the pixel as part of a noise filtered and sharpened version of the image frame.