Stephen Estrop

Stephen Estrop coauthored Microsoft's Recommended 8-Bit YUV Formats for Video Rendering by Gary Sullivan and Stephen Estrop with Gary Sullivan. The article is dated April2002, updated November2008, and specifies sample grids and memory layouts for eight-bit video rendering.^[ref]

An original address calculation illustrates why a pixel format needs more than a sample count. Stipulate an NV12 image of width 10 and height 6, with framebuffer stride 16 bytes in both planes. Let the first luma byte have address 2000, and place the interleaved colour-difference plane immediately after the six stored luma rows. Its base is $2000+6(16)=2096$. The allocation holds $96+48=144$ bytes, although active samples require only $60+30=90$ bytes.

At zero-based row 5, column 9, the luma byte is at $2000+5(16)+9=2089$. Its associated subsampled grid cell is row 2, column 4, whose Cb and Cr bytes are at $2096+2(16)+2(4)=2136$ and 2137. Counting active samples as if they were the allocation size would give the wrong plane base. The shared technical article defines NV12's component order; the chosen dimensions, padding and addresses here are illustrative.^[ref]

These calculations locate stored samples. Reconstructing colour additionally requires chroma sample location, chroma reconstruction and the specified YCbCr conversion. The article's joint byline does not identify which coauthor designed an individual format.