[xiph-commits] r11150 - experimental/derf/theora-exp/doc
tterribe at svn.xiph.org
tterribe at svn.xiph.org
Mon Apr 17 16:35:25 PDT 2006
Author: tterribe
Date: 2006-04-17 16:35:23 -0700 (Mon, 17 Apr 2006)
New Revision: 11150
Removed:
experimental/derf/theora-exp/doc/color.html
experimental/derf/theora-exp/doc/patents.txt
Log:
Remove out-dated documentation.
Deleted: experimental/derf/theora-exp/doc/color.html
===================================================================
--- experimental/derf/theora-exp/doc/color.html 2006-04-17 22:32:39 UTC (rev 11149)
+++ experimental/derf/theora-exp/doc/color.html 2006-04-17 23:35:23 UTC (rev 11150)
@@ -1,719 +0,0 @@
-<HTML>
-<HEAD><TITLE>xiph.org: Ogg Theora documentation</TITLE></HEAD>
-<BODY BGCOLOR="#FFFFFF" TEXT="#202020" LINK="#006666" VLINK="#000000">
-<H1><FONT COLOR="#000070">
-Ogg Theora I specification: color space conventions
-</FONT></H1>
-<H1>Overview</H1>
-<P>
-There are a large number of different color standards used in digital video.
-Since Theora is a lossy codec, it restricts itself to only a few of them to
- simplify playback.
-Unlike the alternate method of describing all the parameters of the color
- model, this allows a few dedicated routines for color conversion to be written
- and heavily optimized in a decoder.
-More flexible conversion functions should instead be specified in an encoder,
- where additional computational complexity is more easily tolerated.
-The color spaces were selected to give a fair representation of color standards
- in use around the world today.
-Most of the standards that do not exactly match one of these can be converted
- to one fairly easily.
-</P>
-<P>
-The Theora codec identification header contains an 8-bit value that describes
- the color space.
-This merely selects one of the color spaces available from an enumerated list.
-Currently, only 3 color spaces are defined, with a fourth possibility that
- indicates the color space is "unknown".
-All of them are Y'C<SUB>b</SUB>C<SUB>r</SUB> color spaces with one luma channel
- and two chroma channels.
-Each channel contains 8-bit discrete values in the range 0-255, which represent
- non-linear gamma pre-corrected signals.
-</P>
-<H2>color space parameters</H2>
-<P>
-The parameters which describe each color space are listed below.
-These are the parameters needed to map colors from the encoded
- Y'C<SUB>b</SUB>C<SUB>r</SUB> representation to the device-independent color
- space CIE XYZ (1931).
-</P>
-<DL>
-<DT>Y'C<SUB>b</SUB>C<SUB>r</SUB> to Y'P<SUB>b</SUB>P<SUB>r</SUB></DT>
-<DD>
-<P>
-This conversion takes 8-bit discrete values in the range 0-255 and maps them to
- real values in the range [0,1] for Y and [-1/2,1/2] for P<SUB>b</SUB>
- and P<SUB>r</SUB>.
-Because some values may fall outside the offset and excursion defined for each
- channel in the Y'C<SUB>b</SUB>C<SUB>r</SUB> space, the results may fall
- outside these ranges in Y'P<SUB>b</SUB>P<SUB>r</SUB> space.
-No clamping should be done at this stage.
-</P>
-<P>
-Parameters: <EM>Offset<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM>,
- <EM>Excursion<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB>,</SUB></EM>
-</P>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">Y'<SUB>out</SUB></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-(Y'<SUB>in</SUB>-<EM>Offset<SUB>Y</SUB></EM>)/
- <EM>Excursion<SUB>Y</SUB></EM>
-</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">P<SUB>b</SUB></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-(C<SUB>b</SUB>-<EM>Offset<SUB>C<SUB>b</SUB></SUB></EM>)/
- <EM>Excursion<SUB>C<SUB>b</SUB></SUB></EM>
-</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">P<SUB>r</SUB></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-(C<SUB>r</SUB>-<EM>Offset<SUB>C<SUB>r</SUB></SUB></EM>)/
- <EM>Excursion<SUB>C<SUB>r</SUB></SUB></EM>
-</TD>
-</TR>
-</TABLE>
-</DD>
-<DT>Y'P<SUB>b</SUB>P<SUB>r</SUB> to R'G'B'</DT>
-<DD>
-<P>
-This conversion takes the one luma and two chroma channel representation and
- maps it to the non-linear R'G'B' space used to drive actual output devices.
-Values should be clamped into the range [0,1] after this stage.
-<P>
-Parameters: <EM>K<SUB>b</SUB></EM>, <EM>K<SUB>r</SUB></EM>
-</P>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">R'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">Y' + 2(1-<EM>K<SUB>r</SUB></EM>)P<SUB>r</SUB></TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">G'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-Y' -
- 2((1-<EM>K<SUB>b</SUB></EM>)<EM>K<SUB>b</SUB></EM>/
- (1-<EM>K<SUB>b</SUB></EM>-<EM>K<SUB>r</SUB></EM>))P<SUB>b</SUB> -
- 2((1-<EM>K<SUB>r</SUB></EM>)<EM>K<SUB>r</SUB></EM>/
- (1-<EM>K<SUB>b</SUB></EM>-<EM>K<SUB>r</SUB></EM>))P<SUB>r</SUB>
-</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">B'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">Y' + 2(1-<EM>K<SUB>b</SUB></EM>)P<SUB>b</SUB></TD>
-</TR>
-</TABLE>
-</DD>
-<DT>R'G'B' to RGB (Output device gamma correction)</DT>
-<DD>
-<P>
-This conversion takes the non-linear R'G'B' voltage levels and maps it to the
- linear light levels produced by the actual output device.
-Note that this conversion is only that of the output device, and its inverse is
- <EM>not</EM> that used by the input device.
-Because a dim viewing environment is assumed in most television standards, the
- overall gamma between the input and output devices is usually around 1.1 to
- 1.2, and not a strict 1.0.
-</P>
-<P>
-For calibration with actual output devices, the model
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">L</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">(E'+Δ)<SUP><EM>γ</EM></SUP></TD>
-</TR>
-</TABLE>
-should be used, with Δ the free parameter and <EM>γ</EM> held
- fixed to the value specified in this document.
-The conversion function presented here is an idealized version with Δ=0.
-</P>
-<P>
-Parameters: <EM>γ</EM>
-</P>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">R</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">R'<SUP><EM>γ</EM></SUP></TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">G</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">G'<SUP><EM>γ</EM></SUP></TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">B</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">B'<SUP><EM>γ</EM></SUP></TD>
-</TR>
-</TABLE>
-</DD>
-<DT>RGB to R'G'B' (Input device gamma correction)</DT>
-<DD>
-<P>
-This conversion takes linear light levels and maps them to the non-linear
- voltage levels used to drive the actual output device.
-This information is merely informative.
-It is not required for building a decoder or for converting between the various
- formats and the actual output capabilities of a particular device.
-</P>
-<P>
-A linear segment is introduced on the low end to reduce noise in dark areas of
- the image.
-The rest of the scale is adjusted so that the power segment of the curve
- intersects the linear segment with the proper slope, and so that it still maps
- 0 to 0 and 1 to 1.
-</P>
-<P>
-Parameters: <EM>β</EM>, <EM>α</EM>, <EM>δ</EM>,
- <EM>ε</EM>
-</P>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">R'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-(1+<EM>ε</EM>)R<SUP>β</SUP>-<EM>ε</EM>
-</TD>
-<TD>for <EM>δ</EM> ≤ R ≤ 1</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">R'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT"><EM>α</EM>R</TD>
-<TD>for 0 ≤ R < <EM>δ</EM></TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">G'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-(1+<EM>ε</EM>)G<SUP>β</SUP>-<EM>ε</EM>
-</TD>
-<TD>for <EM>δ</EM> ≤ G ≤ 1</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">G'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT"><EM>α</EM>G</TD>
-<TD>for 0 ≤ G < <EM>δ</EM></TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">B'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">
-(1+<EM>ε</EM>)B<SUP>β</SUP>-<EM>ε</EM>
-</TD>
-<TD>for <EM>δ</EM> ≤ B ≤ 1</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">B'</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT"><EM>α</EM>B</TD>
-<TD>for 0 ≤ B < <EM>δ</EM></TD>
-</TR>
-</TABLE>
-</DD>
-<DT>RGB to CIE XYZ (1931)</DT>
-<DD>
-<P>
-This conversion maps a device-dependent linear RGB space to the
- device-independent linear CIE XYZ space.
-The parameters are the CIE chromaticity coordinates of the three primaries,
- red, green, and blue, as well as the chromaticity coordinates of the white
- point of the device.
-This is how hardware manufacturers and standards typically describe a
- particular RGB space.
-The math required to convert these parameters into a useful transformation
- matrix is reproduced below.
-</P>
-<P>
-Parameters: <EM>x<SUB>r,g,b,w</SUB></EM>, <EM>y<SUB>r,g,b,w</SUB></EM>
-</P>
-<TABLE>
-<TR>
-<TD ALIGN="RIGHT">F</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT"><TABLE><TR>
-<TD><FONT SIZE="300%">(</FONT></TD>
-<TD><TABLE>
-<TR>
-<TD ALIGN="CENTER"><EM>x<SUB>r</SUB></EM>/<EM>y<SUB>r</SUB></EM></TD>
-<TD ALIGN="CENTER"><EM>x<SUB>g</SUB></EM>/<EM>y<SUB>g</SUB></EM></TD>
-<TD ALIGN="CENTER"><EM>x<SUB>b</SUB></EM>/<EM>y<SUB>b</SUB></EM></TD>
-</TR>
-<TR>
-<TD ALIGN="CENTER">1</TD>
-<TD ALIGN="CENTER">1</TD>
-<TD ALIGN="CENTER">1</TD>
-</TR>
-<TR>
-<TD ALIGN="CENTER">
-(1-<EM>x<SUB>r</SUB></EM>-<EM>y<SUB>r</SUB></EM>)/<EM>y<SUB>r</SUB></EM>
-</TD>
-<TD ALIGN="CENTER">
-(1-<EM>x<SUB>g</SUB></EM>-<EM>y<SUB>g</SUB></EM>)/<EM>y<SUB>g</SUB></EM>
-</TD>
-<TD ALIGN="CENTER">
-(1-<EM>x<SUB>b</SUB></EM>-<EM>y<SUB>b</SUB></EM>)/<EM>y<SUB>b</SUB></EM>
-</TD>
-</TR>
-</TABLE></TD>
-<TD<FONT SIZE="300%">)</FONT></TD>
-</TR></TABLE></TD>
-</TR>
-<TR>
-<TD ALIGN="RIGHT"><TABLE><TR>
-<TD><FONT SIZE="300%">(</FONT></TD>
-<TD><TABLE>
-<TR><TD ALIGN="CENTER">s<SUB>r</SUB></TD></TR>
-<TR><TD ALIGN="CENTER">s<SUB>g</SUB></TD></TR>
-<TR><TD ALIGN="CENTER">s<SUB>b</SUB></TD></TR>
-</TABLE></TD>
-<TD><FONT SIZE="300%">)</FONT></TD>
-</TR></TABLE></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT"><TABLE><TR>
-<TD>F<SUP>-1</SUP><FONT SIZE="300%">(</FONT></TD>
-<TD><TABLE>
-<TR><TD ALIGN="CENTER"><EM>x<SUB>w</SUB></EM>/<EM>y<SUB>w</SUB></EM></TD></TR>
-<TR><TD ALIGN="CENTER">1</TD></TR>
-<TR><TD ALIGN="CENTER">
-(1-<EM>x<SUB>w</SUB></EM>-<EM>y<SUB>w</SUB></EM>)/<EM>y<SUB>w</SUB></EM>
-</TD></TR>
-</TABLE></TD>
-<TD><FONT SIZE="300%">)</FONT></TD>
-</TR></TABLE></TD>
-</TR>
-<TR>
-<TD ALIGN="RIGHT"><TABLE><TR>
-<TD><FONT SIZE="300%">(</FONT></TD>
-<TD><TABLE>
-<TR><TD ALIGN="CENTER">X</TD></TR>
-<TR><TD ALIGN="CENTER">Y</TD></TR>
-<TR><TD ALIGN="CENTER">Z</TD></TR>
-</TABLE></TD>
-<TD><FONT SIZE="300%">)</FONT></TD>
-</TR></TABLE></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT"><TABLE><TR>
-<TD>F<FONT SIZE="300%">(</FONT></TD>
-<TD><TABLE>
-<TR><TD ALIGN="CENTER">s<SUB>r</SUB>R</TD></TR>
-<TR><TD ALIGN="CENTER">s<SUB>g</SUB>G</TD></TR>
-<TR><TD ALIGN="CENTER">s<SUB>b</SUB>B</TD></TR>
-</TABLE></TD>
-<TD><FONT SIZE="300%">)</FONT></TD>
-</TR></TABLE></TD>
-</TR>
-</TABLE>
-</DD>
-</DL>
-<H2>available color spaces</H2>
-<P>
-These are the color spaces currently defined for use by Ogg Theora video.
-Each one has a short name, with which it is referred to in this document, and
- a more detailed specification of the standards from which its parameters are
- derived.
-Some standards do not specify all the parameters necessary.
-For these unspecified parameters, this document serves as the definition of
- what should be used when encoding or decoding Ogg Theora video.
-<H3>Rec 470M (Rec. ITU-R BT.470-6 System M/NTSC with Rec. ITU-R BT.601-5)</H3>
-<P>
-This color space is used by broadcast television and DVDs in much of the
- Americas, Japan, Korea, and the Union of Myanmar
- [<A HREF="#Rec470">Rec470</A>].
-This color space may also be used for System M/PAL (Brazil), with an
- appropriate conversion supplied by the encoder to compensate for the
- different gamma value.
-See the Rec 470BG section for an appropriate gamma value to assume for M/PAL
- input.
-</P>
-<P>
-In the US, studio monitors are adjusted to a D65 white point
- (<EM>x<SUB>w</SUB></EM>,<EM>y<SUB>w</SUB></EM>=0.313,0.329).
-In Japan, studio monitors are adjusted to a D white of 9300K
- (<EM>x<SUB>w</SUB></EM>,<EM>y<SUB>w</SUB></EM>=0.285,0.293).
-</P>
-<P>
-Rec 470 does not specify a digital encoding of the color signals.
-For Ogg Theora, Rec. ITU-R BT.601-5 is used, starting from the R'G'B' signals
- specified by Rec 470 [<A HREF="#Rec601">Rec601</A>].
-</P>
-<P>
-<P>
-Rec 470 does not specify an input gamma function.
-For Ogg Theora, the Rec 709 input function is used (see below).
-This is the same as that specified by SMPTE 170M, which claims to reflect
- modern practice in the creation of NTSC signals (c. 1994)
- [<A HREF="#SMPTE170M">SMPTE170M</A>].
-</P>
-<H4>parameters</H4>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>Offset<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">(16,128,128)</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">
-<EM>Excursion<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM>
-</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">(219,224,224)</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>K<SUB>b</SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">0.114</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>K<SUB>r</SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">0.299</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>γ</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">2.2</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>β</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.45</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>α</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">4.5</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>δ</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.018</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>ε</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.099</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>r</SUB></EM>,<EM>y<SUB>r</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.67,</TD>
-<TD>0.33</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>g</SUB></EM>,<EM>y<SUB>g</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.21,</TD>
-<TD>0.71</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>b</SUB></EM>,<EM>y<SUB>b</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.14,</TD>
-<TD>0.08</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">
-(Illuminant C) <EM>x<SUB>w</SUB></EM>,<EM>y<SUB>w</SUB></EM>
-</TD>
-<TD>=</TD>
-<TD>0.310,</TD>
-<TD>0.316</TD>
-</TR>
-</TABLE>
-<H3>
-Rec 470BG (Rec. ITU-R BT.470-6 Systems B and G with Rec. ITU-R BT.601-5)
-</H3>
-<P>
-This color space is used by the PAL and SECAM systems in much of the rest of
- the world [<A HREF="#Rec470">Rec470</A>].
-This can be used directly by systems (B, B1, D, D1, G, H, I, K, N)/PAL and (B,
- D, G, H, K, K1, L)/SECAM.
-</P>
-<P>
-Note that the Rec 470BG chromaticity values are different from those specified
- in Rec 470M.
-When PAL and SECAM systems were first designed, they were based upon the same
- primaries as NTSC.
-However, as methods of making color picture tubes have changed, the primaries
- used have changed as well.
-The US recommends using correction circuitry to approximate the existing,
- standard NTSC primaries.
-Current PAL and SECAM systems have standardized on primaries in accord with
- more recent technology.
-</P>
-<P>
-Rec 470 provisionally permits the use of the NTSC chromaticity values (given
- above) with legacy PAL and SECAM equipment.
-In Ogg Theora, material must be decoded assuming the new PAL and SECAM
- primaries.
-Material intended for display on old legacy devices should be converted by the
- decoder.
-</P>
-<P>
-The official Rec 470BG specifies a gamma value of <EM>γ</EM>=2.8.
-However, in practice this value is unrealistically high
- [<A HREF="#RefPoy97">Poy97</A>].
-Rec 470BG states that the overall system gamma should be approximately
- <EM>γ</EM>/<EM>β</EM>=1.2.
-However, most cameras pre-correct with a gamma value of <EM>β</EM>=0.45,
- which suggests an output device gamma of approximately <EM>γ</EM>=2.67.
-This is the value recommended for use with PAL systems in Ogg Theora.
-</P>
-<P>
-Rec 470 does not specify a digital encoding of the color signals.
-For Ogg Theora, Rec. ITU-R BT.601-5 is used, starting from the R'G'B' signals
- specified by Rec 470 [<A HREF="#Rec601">Rec601</A>].
-</P>
-<P>
-Rec 470 does not specify an input gamma function.
-For Ogg Theora, the Rec 709 input function is used (see below).
-</P>
-<H4>parameters</H4>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>Offset<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">(16,128,128)</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">
-<EM>Excursion<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM>
-</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">(219,224,224)</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>K<SUB>b</SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">0.114</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>K<SUB>r</SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">0.299</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>γ</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">2.67</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>β</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.45</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>α</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">4.5</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>δ</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.018</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>ε</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.099</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>r</SUB></EM>,<EM>y<SUB>r</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.64,</TD>
-<TD>0.33</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>g</SUB></EM>,<EM>y<SUB>g</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.29,</TD>
-<TD>0.60</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>b</SUB></EM>,<EM>y<SUB>b</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.15,</TD>
-<TD>0.06</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">
-(D65) <EM>x<SUB>w</SUB></EM>,<EM>y<SUB>w</SUB></EM>
-</TD>
-<TD>=</TD>
-<TD>0.313,</TD>
-<TD>0.329</TD>
-</TR>
-</TABLE>
-<H3>Rec 709 (Rec. ITU-R BT.709-5 1125/60/2:1 System)</H3>
-<P>
-This color space is used by HDTV systems on a worldwide basis.
-It differs slightly from the competing standard SMPTE 240M in several points
- [<A HREF="#SMPTE240M">SMPTE240M</A>].
-The linear segment of the input gamma function in the latter has a slope of
- <EM>α</EM>=4.0 (and hence <EM>δ</EM>=0.0228 and
- <EM>ε</EM>=0.1115).
-The chromaticity values of the RGB primaries are slightly different
- ((0.630,0.340), (0.310,0.595), and (0.155,0.070)).
-The Y'P<SUB>b</SUB>P<SUB>r</SUB> conversion parameters also differ
- (<EM>K<SUB>b</SUB></EM>=0.087 and <EM>K<SUB>r</SUB></EM>=0.212).
-Each of these differences is minor, but an encoder should convert source
- material represented with the SMPTE 240M standard appropriately.
-</P>
-<P>
-The 1250/50/2:1 system also specified in Rec 709 uses the conversion from
- Y'P<SUB>b</SUB>P<SUB>r</SUB> to R'G'B' specified in Rec. ITU-R BT.601-5 (see
- above) instead of the one given here.
-This color space may be used for that system with an appropriate conversion
- supplied by the encoder to correct for this.
-</P>
-<P>
-This color space may be used for computer generated video in the sRGB color
- space after a suitable conversion.
-The sRGB space has an input gamma function with <EM>β</EM>=1.0/2.4,
- <EM>α</EM>=12.92, and hence <EM>δ</EM>=0.0031308 and
- <EM>ε</EM>=1.055.
-The output gamma function uses <EM>γ</EM>=2.2.
-Chromaticity coordinates of the primaries and the white point are the same as
- Rec 709, and Rec 709's conversion from R'G'B' to Y'C<SUB>b</SUB>C<SUB>r</SUB>
- may be used.
-</P>
-<P>
-Rec 709 does not specify an output device gamma, only an input device gamma of
- <EM>β</EM>=0.45.
-For Ogg Theora, a value of <EM>γ</EM>=2.5 is used as being
- representative of common CRT gamma values.
-This gives a system gamma value of <EM>γ</EM>/<EM>β</EM>=1.125, well
- within the 1.1 to 1.2 range normally used for television.
-</P>
-<H4>parameters</H4>
-<TABLE>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>Offset<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">(16,128,128)</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">
-<EM>Excursion<SUB>Y,C<SUB>b</SUB>,C<SUB>r</SUB></SUB></EM>
-</TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">(219,224,224)</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>K<SUB>b</SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">0.0722</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>K<SUB>r</SUB></EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT" COLSPAN="2">0.2126</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>γ</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">2.5</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>β</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.45</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>α</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">4.5</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>δ</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.018</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>ε</EM></TD>
-<TD>=</TD>
-<TD ALIGN="LEFT">0.099</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>r</SUB></EM>,<EM>y<SUB>r</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.640,</TD>
-<TD>0.330</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>g</SUB></EM>,<EM>y<SUB>g</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.300,</TD>
-<TD>0.600</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT"><EM>x<SUB>b</SUB></EM>,<EM>y<SUB>b</SUB></EM></TD>
-<TD>=</TD>
-<TD>0.150,</TD>
-<TD>0.060</TD>
-</TR>
-<TR VALIGN="BOTTOM">
-<TD ALIGN="RIGHT">
-(D65) <EM>x<SUB>w</SUB></EM>,<EM>y<SUB>w</SUB></EM>
-</TD>
-<TD>=</TD>
-<TD>0.3127,</TD>
-<TD>0.3290</TD>
-</TR>
-</TABLE>
-<H2>references</H2>
-<DL>
-<DT>[<A NAME="Poy97">Poy97</A>]</DT>
-<DD>
-Poynton, Charles, <I>Frequently-Asked Questions about Gamma</I>.
- <A HREF="http://www.poynton.com/GammaFAQ.html">http://www.poynton.com/GammaFAQ/html</A>,
- Feb. 1997.
-</DD>
-<DT>[<A NAME="Rec470">Rec470</A>]</DT>
-<DD>
-Recommendation ITU-R BT.470-6, <I>Conventional Television Systems</I>
- (1970, revised 1998). International Telecommunications Union, 1211 Geneva 20,
- Switzerland.
-</DD>
-<DT>[<A NAME="Rec601">Rec601</A>]</DT>
-<DD>
-Recommendation ITU-R BT.601-5, <I>Studio Encoding Parameters of
- Digital Television for Standard 4:3 and Wide-Screen 16:9 Aspect Ratios</I>
- (1982, revised 1995). International Telecommunications Union, 1211 Geneva 20,
- Switzerland.
-</DD>
-<DT>[<A NAME="Rec709">Rec709</A>]</DT>
-<DD>
-Recommendation ITU-R BT.709-5, <I>Parameter values for the
- HDTV standards for production and international programme exchange</I>
- (1990, revised 2002). International Telecommunications Union, 1211 Geneva 20,
- Switzerland.
-</DD>
-<DT>[<A NAME="SMPTE170M">SMPTE170M</A>]</DT>
-<DD>
-Society of Motion Picture and Television Engineers, <I>Television —
- Composite Analog Video Signal — NTSC for Studio Applications</I>.
- SMPTE-170M, 1994
-</DD>
-<DT>[<A NAME="SMPTE240M">SMPTE240M</A>]</DT>
-<DD>
-Society of Motion Picture and Television Engineers, <I>Television —
- Signal Parameters — 1125-Line High-Definition Production</I>.
- SMPTE-240M, 1999.
-</DD>
-</DL>
-</BODY>
-</HTML>
Deleted: experimental/derf/theora-exp/doc/patents.txt
===================================================================
--- experimental/derf/theora-exp/doc/patents.txt 2006-04-17 22:32:39 UTC (rev 11149)
+++ experimental/derf/theora-exp/doc/patents.txt 2006-04-17 23:35:23 UTC (rev 11150)
@@ -1,64 +0,0 @@
-MPEG2 US Patents on Interlacing:
-RE35,093 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=RE35,093.WKU.&OS=PN/RE35,093&RS=PN/RE35,093
-
-Aside from hardware-oriented language that excludes this from covering a software
- system, this patent is only a field-based system: block matching is actually
- performed on an interpolated version of the even fields against other fields.
-Theora matches against both fields and frames.
-They also use MPEG VLC codes and MPEG quantization tables which Theora does not.
-
-5,426,464 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,426,464.WKU.&OS=PN/5,426,464&RS=PN/5,426,464
-
-This patent covers the RFF flags.
-It also has significant hardware-oriented language that makes it unlikely to
- apply to a software system.
-In addition, they simply sum up pixel differences and compare with a threshold to
- determine whether or not to omit a field.
-ANYTHING more sophisticated (e.g., a block-wise maximum difference, or an
- HVS-weighted difference) would avoid infringing on this patent.
-
-5,491,516 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,491,516.WKU.&OS=PN/5,491,516&RS=PN/5,491,516
-
-This patent is a divisional application of the previous one.
-All of the same arguments apply.
-
-5,600,376 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,600,376.WKU.&OS=PN/5,600,376&RS=PN/5,600,376
-
-This patent is a divisional application of the previous two.
-All of the same arguments apply.
-
-5,093,720 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,093,720.WKU.&OS=PN/5,093,720&RS=PN/5,093,720
-
-Again heavily described in the langauge of hardware, this patent also utilizes a
- full search for matching blocks, and although they attempt to cover the
- distortion metrics of SAD, MSE, "minimum bits" and "minimum distortion", the
- last two are meaningless.
-What is actually desired is "minimum bits for a given distortion", or
- "minimum distortion for a given number of bits" or a combination of the two.
-Also, they again only consider field-based matches, while Theora also runs the
- search over interleaved blocks, and don't appear to perform half-pel
- interpolation.
-
-RE36,015 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=RE36,015.WKU.&OS=PN/RE36,015&RS=PN/RE36,015
-RE36,507 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=RE36,507.WKU.&OS=PN/RE36,507&RS=PN/RE36,507
-5,223,949 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,223,949.WKU.&OS=PN/5,223,949&RS=PN/5,223,949
-5,784,107 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,784,107.WKU.&OS=PN/5,784,107&RS=PN/5,784,107
-5,949,489 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,949,489.WKU.&OS=PN/5,949,489&RS=PN/5,949,489
-5,963,258 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,963,258.WKU.&OS=PN/5,963,258&RS=PN/5,963,258
-5,970,175 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,970,175.WKU.&OS=PN/5,970,175&RS=PN/5,970,175
-5,990,960 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,990,960.WKU.&OS=PN/5,990,960&RS=PN/5,990,960
-6,002,439 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,002,439.WKU.&OS=PN/6,002,439&RS=PN/6,002,439
-6,097,759 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,097,759.WKU.&OS=PN/6,097,759&RS=PN/6,097,759
-6,188,794 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,188,794.WKU.&OS=PN/6,188,794&RS=PN/6,188,794
-6,307,973 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,307,973.WKU.&OS=PN/6,307,973&RS=PN/6,307,973
-4,849,812 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=4,849,812.WKU.&OS=PN/4,849,812&RS=PN/4,849,812
-5,461,421 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,461,421.WKU.&OS=PN/5,461,421&RS=PN/5,461,421
-5,467,086 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,467,086.WKU.&OS=PN/5,467,086&RS=PN/5,467,086
-5,343,248 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,343,248.WKU.&OS=PN/5,343,248&RS=PN/5,343,248
-5,461,420 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,461,420.WKU.&OS=PN/5,461,420&RS=PN/5,461,420
-5,539,466 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,539,466.WKU.&OS=PN/5,539,466&RS=PN/5,539,466
-5,543,847 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,543,847.WKU.&OS=PN/5,543,847&RS=PN/5,543,847
-5,666,461 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,666,461.WKU.&OS=PN/5,666,461&RS=PN/5,666,461
-6,160,849 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,160,849.WKU.&OS=PN/6,160,849&RS=PN/6,160,849
-5,422,676 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,422,676.WKU.&OS=PN/5,422,676&RS=PN/5,422,676
-5,175,618 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=5,175,618.WKU.&OS=PN/5,175,618&RS=PN/5,175,618
More information about the commits
mailing list