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Doc: Further clarify MCU definition

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2024-09-01 11:23:31 -04:00
parent 7ec70ee891
commit 797c6ccd98
7 changed files with 60 additions and 42 deletions
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java/doc/org/libjpegturbo/turbojpeg/TJ.html
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@@ -2199,14 +2199,17 @@ public static final&nbsp;int FLAG_LIMITSCANS</pre>
<p>In a typical lossy JPEG image, 8x8 blocks of DCT coefficients for each
component are interleaved in a single scan. If the image uses chrominance
subsampling, then multiple luminance blocks are stored together, followed
by a single block for each chrominance component. The combination of the
full-resolution luminance block(s) and the (possibly subsampled)
chrominance blocks corresponding to the same pixels is called a "Minimum
Coded Unit" (MCU.) In a non-interleaved lossy JPEG image, each component
is stored in a separate scan, and an MCU is a single DCT block, so we use
the term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in
an interleaved JPEG image. For the common case of interleaved JPEG
images, an iMCU is the same as an MCU.</div>
by a single block for each chrominance component. The minimum set of
full-resolution luminance block(s) and corresponding (possibly subsampled)
chrominance blocks necessary to represent at least one DCT block per
component is called a "Minimum Coded Unit" or "MCU". (For example, an MCU
in an interleaved lossy JPEG image that uses 4:2:2 subsampling consists of
two luminance blocks followed by one block for each chrominance
component.) In a non-interleaved lossy JPEG image, each component is
stored in a separate scan, and an MCU is a single DCT block, so we use the
term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in an
interleaved JPEG image. For the common case of interleaved JPEG images,
an iMCU is the same as an MCU.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>subsamp</code> - the level of chrominance subsampling (one of
@@ -2228,14 +2231,17 @@ public static final&nbsp;int FLAG_LIMITSCANS</pre>
<p>In a typical lossy JPEG image, 8x8 blocks of DCT coefficients for each
component are interleaved in a single scan. If the image uses chrominance
subsampling, then multiple luminance blocks are stored together, followed
by a single block for each chrominance component. The combination of the
full-resolution luminance block(s) and the (possibly subsampled)
chrominance blocks corresponding to the same pixels is called a "Minimum
Coded Unit" (MCU.) In a non-interleaved lossy JPEG image, each component
is stored in a separate scan, and an MCU is a single DCT block, so we use
the term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in
an interleaved JPEG image. For the common case of interleaved JPEG
images, an iMCU is the same as an MCU.</div>
by a single block for each chrominance component. The minimum set of
full-resolution luminance block(s) and corresponding (possibly subsampled)
chrominance blocks necessary to represent at least one DCT block per
component is called a "Minimum Coded Unit" or "MCU". (For example, an MCU
in an interleaved lossy JPEG image that uses 4:2:2 subsampling consists of
two luminance blocks followed by one block for each chrominance
component.) In a non-interleaved lossy JPEG image, each component is
stored in a separate scan, and an MCU is a single DCT block, so we use the
term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in an
interleaved JPEG image. For the common case of interleaved JPEG images,
an iMCU is the same as an MCU.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>subsamp</code> - the level of chrominance subsampling (one of

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java/org/libjpegturbo/turbojpeg/TJ.java
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@@ -126,14 +126,17 @@ public final class TJ {
* <p>In a typical lossy JPEG image, 8x8 blocks of DCT coefficients for each
* component are interleaved in a single scan. If the image uses chrominance
* subsampling, then multiple luminance blocks are stored together, followed
* by a single block for each chrominance component. The combination of the
* full-resolution luminance block(s) and the (possibly subsampled)
* chrominance blocks corresponding to the same pixels is called a "Minimum
* Coded Unit" (MCU.) In a non-interleaved lossy JPEG image, each component
* is stored in a separate scan, and an MCU is a single DCT block, so we use
* the term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in
* an interleaved JPEG image. For the common case of interleaved JPEG
* images, an iMCU is the same as an MCU.
* by a single block for each chrominance component. The minimum set of
* full-resolution luminance block(s) and corresponding (possibly subsampled)
* chrominance blocks necessary to represent at least one DCT block per
* component is called a "Minimum Coded Unit" or "MCU". (For example, an MCU
* in an interleaved lossy JPEG image that uses 4:2:2 subsampling consists of
* two luminance blocks followed by one block for each chrominance
* component.) In a non-interleaved lossy JPEG image, each component is
* stored in a separate scan, and an MCU is a single DCT block, so we use the
* term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in an
* interleaved JPEG image. For the common case of interleaved JPEG images,
* an iMCU is the same as an MCU.
*
* @param subsamp the level of chrominance subsampling (one of
* {@link #SAMP_444 SAMP_*})
@@ -156,14 +159,17 @@ public final class TJ {
* <p>In a typical lossy JPEG image, 8x8 blocks of DCT coefficients for each
* component are interleaved in a single scan. If the image uses chrominance
* subsampling, then multiple luminance blocks are stored together, followed
* by a single block for each chrominance component. The combination of the
* full-resolution luminance block(s) and the (possibly subsampled)
* chrominance blocks corresponding to the same pixels is called a "Minimum
* Coded Unit" (MCU.) In a non-interleaved lossy JPEG image, each component
* is stored in a separate scan, and an MCU is a single DCT block, so we use
* the term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in
* an interleaved JPEG image. For the common case of interleaved JPEG
* images, an iMCU is the same as an MCU.
* by a single block for each chrominance component. The minimum set of
* full-resolution luminance block(s) and corresponding (possibly subsampled)
* chrominance blocks necessary to represent at least one DCT block per
* component is called a "Minimum Coded Unit" or "MCU". (For example, an MCU
* in an interleaved lossy JPEG image that uses 4:2:2 subsampling consists of
* two luminance blocks followed by one block for each chrominance
* component.) In a non-interleaved lossy JPEG image, each component is
* stored in a separate scan, and an MCU is a single DCT block, so we use the
* term "iMCU" (interleaved MCU) to refer to the equivalent of an MCU in an
* interleaved JPEG image. For the common case of interleaved JPEG images,
* an iMCU is the same as an MCU.
*
* @param subsamp the level of chrominance subsampling (one of
* {@link #SAMP_444 SAMP_*})