As illustrated in FIG. 4B, a reference LE portion 424, which may be of the same spatial dimensions of the first LE portion (202-L), may be generated based on the second LE portion (204-L) by RPU 426 (which may be, for example, 154 of FIG. 1B) during an inter-layer prediction process. In some embodiments, a processing path or sub-path comprising a low pass filter (428) in the vertical direction (which removes high spatial frequency content in the vertical direction), a vertical subsampler (430; which may keep, for example, every other row), and a horizontal up-sampler (432) may be used to generate the reference LE portion 404.
A subtraction operation (422) in the demultiplexer (160-5) may be configured to accept the reference LE portion 424 (which has been removed high spatial frequency content in the horizontal direction in addition to the high spatial frequency content in the vertical direction removed by an upstream multi-layer video encoder (e.g., 100 of FIG. 1A)) and the first LE portion (202-L) as input and to subtract the first LE portion (202-L) by the reference LE portion 424 to generate a high pass LE portion that comprises high spatial frequency content in the vertical direction only. In some embodiments, the high pass LE portion as described herein may be equivalent to the high pass LE portion generated by the high pass filter (210-2) of FIG. 3B.
