I have been trying to understand how the MIDE value affects picture detail, absent a definitive document from Sony. Word is, the official service manual doesnâ€™t go into as much detail as I want. (Am I wrong, anyone?) So itâ€™s like a game: try a bunch of stuff, and try to divine the rules. Surely, among a group of wireheads and obsessive-compulsive types (maybe Myst devotees) on this fine forum, we can move ahead in characterizing these codes and keep adding to the code chart that is widely circulating (Excel spreadsheet).
I am willing to bet that the acronym stands for Matrix - Image Detail Enhancement. I am experimenting with my own newly-purchased 36XS955 set. (Yes, I am very, very pleased!)
What seems certain is that changes on-screen are not monotonic with changes in MIDE, i.e. things do not steadily change in one direction as MIDE is altered from 0 thru 63. It seems all anyone can do is note the picture characteristics that correspond with specific MIDE values, and make detaled notes. Maybe there is a pattern, but I havenâ€™t found much yet in that area. But here is a first try:
(1) As you go from 0 to 63, both vertical and horizontal detail enhancement is increased or decreased, but not necessarily both together. If you pay attention to vertical fine lines (horiz detail) and alter MIDE, enhancement reached various peaks and minimums as you advance MIDE. The same is true of horizontal fine lines (vert detail), but the peaks and minimums are generally at differet values. I.e. some settings keep vertical enhancement at zero and set various amounts of horizontal detail.
Vertical detail enhancement is obnoxious to me, always appearing coarse and false. It appears that some values of MIDE that keep vert enhancement at zero are 0, 8, 12 20, 24, 28, 36, (etc).
(2) Horizontal detail varies without a pattern I can see yet. 0 seems neutral, 1 mushy (a detail decrease?), then all others vary from neutral (0), to moderate (5), slight (8), extreme, (18,19), etc. in numerous combinations.
(3) Being conservative, then, settings of MIDE = 0 or 8 seem to minimize enhancements. I am trying to optimize high-qualiy broadcast television, and so â€œbalancingâ€ horizontal and vertical detail is a reasonable goal with the best sources. For me, this is MIDE = 8. More horiz detail enhancement also exaggerates noise in the picture and has a downside.
If MIDE truly is a matrix of, say 8 X 8 independent parameters, then I wonder why it doesnâ€™t show a pattern. If, for example, vertical and horizontal enhancement had 8 levels each, and this was an 8 X 8 matrix of those values, then it would seem reasonable to make the MIDE numbers correspond to cells in the matrix, numbered across, then down, or the reverse.
But perhaps there are more than two (H and V) parameters. Weâ€™re talking digital image manipulation, here, and if there is a complex polynomial defining detail enhancement, then some of the matrixâ€™s values could be higher or lower-order coefficients. For example, some settings may appear to be identical with even the best broadcast TV, but one would see the effects on a fine HDTV signal or on DVD. (The *dimension* of the enhancement for those settings is much smaller and does nothing for the coarser SDTV signals.)
Fortunately these settings are complete independent for the various picture modes, inputs, and video modes. So one can optimize for SDTV and leave HD ot DVD material for another day and more fiddling.
I hope I am not being too anal for anyone here, but I really would like to dig a little deeper into how these parameters affect video display on these marvelous XS-series (and other related) sets. I have an engineering background, and I hope to bring some clarity (as opposed to simplicity) to the discussion. Iâ€™ll continue to post proposed revelations and discoveries, and I hope that others might do the same. I have gotten a *lot* from what I have read here so far, and I want to contribute, too. Iâ€™ll post questions in separate messages.
Should we start another thread with the focus of *just* Sony service-code discussions?