1. An apparatus, comprising: a camera configured to capture a plurality of image frames suitable for generation of a high dynamic range (HDR) image frame; an image signal processor comprising a temporal filter module, wherein the image signal processor is configured to: receive a current image frame for filtering at the temporal filter module, wherein the current image frame is one of the plurality of image frames captured by the camera; receive a reference image frame for the temporal filter module that comprises image data of one or more different image frames of the plurality of image frames captured by the camera, the reference image frame having a longer exposure than the current image frame; generate a normalized current image frame by applying digital gain to the current image frame in response to the longer exposure of the reference image frame relevant to the exposure of the current image frame; generate a filtered version of the current image frame according to an HDR blending scheme for the plurality of images that blends the reference image frame with the normalized current image frame; determine that the current image frame is last of the plurality of image frames to be filtered; and in response to the determination that the current image frame is the last of the plurality of image frames to be filtered, provide the filtered version of the current image frame as the HDR image frame.