Материал: part05

G.5 RLE Header Format​

The RLE Header contains the number of RLE Segments for the image, and the starting offset of each of the RLE Segments. Each​ of these numbers is represented by a UL (unsigned long) value stored in little-endian format. The RLE Header is 16 long words in​ length. This allows it to describe a compressed image with up to 15 RLE Segments. All unused segments offsets shall be set to zero.​

Each of the starting locations for the RLE Segments are byte offsets relative to the beginning of the RLE Header. Since the RLE​ Header is 16 unsigned longs or 64 bytes, the offset of RLE Segment One is 64.​

The following diagram illustrates the ordering of the offsets within the RLE Header.​

Table G.5-1. Ordering of the Offsets Within the RLE Header​

number of RLE Segments​ offset of RLE Segment 1 = 64​ offset of RLE Segment 2​

. . .​

. . .​

offset of RLE Segment n​ 0​ 0​ 0​

G.6 Example of Elements For An Encoded YCbCr RLE Three-frame Image with​ Basic Offset Table​

Table G.6-1 is an example of encoding of RLE Compressed Frames (described in Section G.4) with the basic offset table. Table G.6-​ 2 is an example of Item Value data for one frame.​

Table G.6-1. Example of Elements for an Encoded YCbCr RLE Three-Frame Image with Basic Offset​ Table​

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Table G.6-1b. Example of Elements for an Encoded YCbCr RLE Three-Frame Image with Basic Offset​ Table (continued)​

Table G.6-2. Example of Encoded YCbCr RLE Compressed Frame Item Value​

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H Character Sets and Person Name Value​ Representation in the Japanese Language​ (Informative)​

H.1 Character Sets for the Japanese Language​

The purpose of this section is to explain the character sets for the Japanese language.​

H.1.1 JIS X 0201​

JIS X 0201 has the following code elements:​

•​ISO-IR 13 Japanese katakana (phonetic) characters (94 characters)​

•​ISO-IR 14 Japanese romaji (alphanumeric) characters (94 characters)​

JIS X 0201 defines a 7-bit romaji code table (ISO-IR 14), a 7-bit katakana code table (ISO-IR 13), and the combination of romaji and​ katakana as an 8-bit code table (ISO-IR 14 as G0, ISO-IR 13 as G1).​

The7-bitromaji(ISO-IR14)isidenticaltoASCII(ISO-IR6)exceptthatbitcombination05/12representsayensignandbitcombination​ 07/14 represents an over-line. These are national Graphic Character allocations in ISO 646.​

The Escape Sequence for ISO/IEC 2022 is shown for reference in Table H.1-1 (for the Defined Terms, see PS3.3).​

Table H.1-1. ISO/IEC 2022 Escape Sequence for ISO-IR 13 and ISO-IR 14​

1.​Table H.1-1 does not include the G2 and G3 sets that are not used in DICOM. See Section 6.1.2.5.1.​

2.​Defined Terms ISO_IR 13 and ISO 2022 IR 13 for the value of the Specific Character Set (0008,0005) support the G0​ set for ISO-IR 14 and G1 set for ISO-IR 13. See PS3.3.​

H.1.2 JIS X 0208​

JIS X 0208 has the following code element:​

•​ISO-IR 87: Japanese kanji (ideographic), hiragana (phonetic), and katakana (phonetic) characters (942 characters, 2-byte).​

H.1.3 JIS X 0212​

JIS X 0212 has the following code element:​

•​ISO-IR 159: Supplementary Japanese kanji (ideographic) characters (942 characters, 2-byte)​

The Escape Sequence for ISO/IEC 2022 is shown for reference in Table H.1-2 (for the Defined Terms, see PS3.3)​

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Table H.1-2. ISO/IEC 2022 Escape Sequence for ISO-IR 87 and ISO-IR 159​

1.​The Escape Sequence for the designation function G0-DESIGNATE 94-SET, has first I byte 02/04 and second I byte​ 02/08. There is an exception to this: The second I byte 02/08 is omitted if the Final Byte is 04/00, 04/01 or 04/02. See​ ISO/IEC 2022.​

2.​The table does not include the G2 and G3 sets that are not used in DICOM. See Section 6.1.2.5.1.​

3.​Defined Term ISO 2022 IR 87 for the value of the Specific Character Set (0008,0005) supports the G0 set for ISO-IR​ 87, and Defined Term ISO 2022 IR 159 supports the G0 set for ISO-IR 159. See PS3.3.​

H.2 Internet Practice​

DICOM has adopted an encoding method for Japanese character sets that is similar to the method for Internet practice.​

The major protocols for the Internet such as SMTP, NNTP and HTTP adopt the encoding method for Japanese characters called​ "ISO-2022-JP" as described in RFC 1468, Japanese Character Encoding for Internet Messages. There is also a less commonly used​ Internet practice called "ISO-2022-JP-2" described in RFC 1554, which supports a larger repertoire of character sets and additionally​ requires an escape to a single-byte character set before encoding a SPACE (unlike DICOM and ISO-2022-JP).​

The character sets supported for the Japanese language in DICOM and Internet practice are shown in Table H.2-1.​

Table H.2-1. Character Sets for the Japanese language in DICOM and Internet practice​

The Control Characters supported in DICOM and Internet practice are shown in Table H.2-2.​

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Table H.2-2. Control Characters Supported in DICOM and Internet practice​

H.3 Example of Person Name Value Representation in the Japanese Language​

Character strings representing person names are encoded using a convention for PN value representations based on component​ groups with 5 components.​

For languages that use ideographic characters, it is sometimes necessary to write names both in ideographic characters and in​ phonetic characters. Ideographic characters may be required for official purposes, while phonetic characters may be needed for​ pronunciation and data processing purposes.​

For the purpose of writing names in ideographic characters and in phonetic characters, up to 3 component groups may be used. The​ delimiter of the component group shall be the equals character "=" (3DH). The three component groups in their order of occurrence​ are: an alphabetic representation, an ideographic representation, and a phonetic representation.​

H.3.1 Value 1 of Attribute Specific Character Set (0008,0005) is Not Present.​

Example H.3-1. Value 1 of Attribute Specific Character Set (0008,0005) is Not Present​

In this case, ISO-IR 6 is used by default in Specific Character Set:​

(0008,0005) \ISO 2022 IR 87​

Character String:​

Yamada^Tarou= ^ = ^ ​

Yamada^Tarou= ESC 02/04 04/02 ESC 02/08 04/02 ^ ESC 02/04 04/02 ESC 02/08 04/02 = ESC 02/04 04/02 ​ ESC 02/08 04/02 ^ ESC 02/04 04/02 ESC 02/08 04/02​

Encoded representation:​

05/09 06/01 06/13 06/01 06/04 06/01 5/14 05/04 06/01 07/02 06/15 07/05 03/13 01/11 02/04 04/02 03/11 03/03 04/05 04/04 01/11 02/08 04/02 05/14 01/11 02/04 04/02 04/02 04/00 04/15 03/10 01/11 02/08 04/02 03/13 01/11 02/04 04/02 02/04 06/04 02/04 05/14 02/04 04/00 01/11 02/08 04/02 05/14 01/11 02/04 04/02 02/04 03/15 02/04 06/13 02/04 02/06 01/11 02/08 04/02

An example of what might be displayed or printed by an ASCII based machine that displays or prints the Control Character ESC​ (01/11) using \033:​

Yamada^Tarou=\033$B;3ED\033(B^\033$BB@O:\033(B=\033$B$d$^$@\033(B^\033$B$?$m$&\033(B

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