Progressive Image Resolution
diagonal pixel or quad pixel interleaving facilitates
bandwidth-defined digital imaging cruising |
[UNDER CONSTRUCTION]
[Topically related to Fully Interleaved Scanning for infinite
resolution on bandwidth-defined video; and Video Compression]
Bandwidth-restricted information connections may be used for remote activity
simulations and zoom-searching in 3-D image-space cruising. By fully interleaving
pixels on the diagonal in cartesian-coordinated (*) digital images -e.g. the Internet
image formats maximized- image resolution may be progressively refined.
* (Other coordinates are similar but not as binary: equilateral-triangular-hexagonal is
best-packed, and its interstitials have simple placement at triple density.)
From a given starting position in a surround-image, which may be left-right/up-down
scanned, or left/right-diagonally, additional sub-diagonal or sub-vertical interleaved
image resolution sampling is conveyed, which briefly avails shallow depth zooming
to a factor-of-two, image-space penetration. As the improved resolution is used,
a further factor-of-two sub-diagonal interleaved image resolution sampling is
conveyed,- allowing the next factor-of-two image-space penetration. Ad infinitum.
For more narrowly constrained image-spaces, each succeeded factor of two image-space
penetration also narrows the image-space field of view, thus maintaining a constant
bandwidth requirement on image updates.
The interstitial pixel can be either direct-value, with its differential to its four
adjacent neighbors, reducing them by its quarter; or its can be a difference itself
to their average ... either way exhibits a little squirm as the progressive pixels
overlap.
SUBNOTES:
(In practical camera applications this may relate also to pixel luminance:
Motion toward an object expands its angular perception without changing its own
amplitude, but of pixels: Subpixel angles increase, brightening the pixel,
until its image space exceeds the pixel. Compression schemes have several items
of improvement for this, especially on schemes of tendencies-coefficients extraction
with bit-slice level-progressive sampling and leading-zeroes compression:
- Pixels can be scanned faster than usual
if each can be reset by the bit-slice sample value:
Eventually within the usual pixel time, the low-order bits are scanned,
but having been cumulated as well, thus also sub-least precision is attained,
over several pixels.
- If the coeffixels, computed from pixels,
were relocated uniquely (on cyclic base) across consecutive frames,
placed uniformly across the time-base,
and positive where these represent positive pixels, negatively where negative pixels,
there is certain intrinsic reconstruction of the original image on the average,
though temporally and bit-slice-layer enhancement-distorted.
(However, in tight schemes these coeffixels are intermediate values not transmitted.)
- The least-precise receiver-display difference represents a wash
larger than the pixel, to smooth the image where it was originally smooth or of less
distinction than could be coded. (A difference of 2 stands distinctly above that wash.)
- The least-precise coeffixel increment represents an additional 0.35,--
this is especially important for single-bit-coded bit-sliced values,
except if the total is zero, in which case it probably represents zero;
0.5 would be exactly the average but would be noticeable as sometimes additive,
sometimes subtractive; 0.25 is half smaller, but also below design detectability:
whence the intermediate value of 0.35, taken as below the average-between,
to minimize that appearance of edge-ringing, less desireable than edge-softening.
© 1998, 2012 GrandAdmiralPetry@Lanthus.net