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Content for  TS 31.102  Word version:  17.1.0

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B (Normative)  Image Coding SchemesWord‑p. 290
The following image coding schemes are applicable to rectangular raster images. Raster image points are assumed to be of square shape. They are numbered sequentially from 1 onwards, starting at the upper left corner, proceeding line by line downwards, each line in turn proceeding from left to right, and ending at the image's lower right corner.
The following example illustrates the numbering scheme for raster image points by showing how the corner points are numbered, assuming an image length of x points and an image height of y points.
1x
(x * (y-1) + 1)(x * y)
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B.1  Basic Image Coding Scheme

This coding scheme applies to rectangular raster images made up of raster points that are either set or not set. This coding scheme does not support any notion of colour. Image data are coded as follows:
Byte(s) Description Length
1image width = X1
2image height = Y1
3 to K+2image bodyK
 
Coding of image body:
The status of each raster image point is coded in one bit, to indicate whether the point is set (status = 1) or not set (status = 0).
Byte 1:
b8 b7 b6 b5 b4 b3 b2 b1
status of raster point 1 status of raster point 2 status of raster point 3 status of raster point 4 status of raster point 5 status of raster point 6 status of raster point 7 status of raster point 8
 
Byte 2:
b8 b7 b6 b5 b4 b3 b2 b1
status of raster point 9 status of raster point 10 status of raster point 11 status of raster point 12 status of raster point 13 status of raster point 14 status of raster point 15 status of raster point 16
 
etc.
Unused bits shall be set to 1.
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B.2  Colour Image Coding SchemeWord‑p. 291
This coding scheme applies to coloured rectangular raster images. Raster image point colours are defined as references into a colour look-up table (CLUT), which contains a subset of the red-green-blue colour space. The CLUT in turn is located in the same transparent file as the image instance data themselves, at an offset defined within the image instance data.
Image data are coded as follows:
Byte(s) Description Length
1Image width = X1
2Image height = Y1
3Bits per raster image point = B1
4Number of CLUT entries = C1
5 to 6Location of CLUT (Colour Look-up Table)2
7 to K+6Image bodyK
 
Bits per raster image point:
Contents:
  • the number B of bits used to encode references into the CLUT, thus defining a raster image point's colour. B shall have a value between 1 and 8.
Coding:
  • binary.
Number of entries in CLUT:
Contents:
  • the number C of entries in the CLUT which may be referenced from inside the image body. CLUT entries are numbered from 0 to C-1. C shall have a value between 1 and 2**B.
Coding:
  • binary. The value 0 shall be interpreted as 256.
Location of CLUT:
Contents:
  • this item specifies where the CLUT for this image instance may be found. The CLUT is always located in the same transparent file as the image instance data themselves, at an offset determined by these two bytes.
Coding:
  • Byte 1: high byte of offset into Image Instance File.
  • Byte 2: low byte of offset into Image Instance File.
Image body:
Coding:
  • each raster image point uses B bits to reference one of the C CLUT entries for this image instance. The CLUT entry being thus referenced yields the raster image point's colour. The image body is arrayed as for the Basic Colour Image Coding Scheme, that is, starting with the highest bit of the first raster image point's colour information.
Byte 1:
b8 b7 b6 b5 b4 b3 b2 b1
Bit B (MSB) of raster point 1 CLUT reference Bit B-1 of raster point 1 CLUT reference Bit B-2 of raster point 1 CLUT reference ... etc ... etc ... etc ... etc ... etc
 
etc.
Unused bits shall be set to 1.
The CLUT (Colour Look-up Table) for an image instance with C colours is defined as follows:
Contents:
  • C CLUT entries defining one colour each.
Coding:
  • the C CLUT entries are arranged sequentially:
    Byte(s) of CLUT CLUT Entry
    1-3entry 0
    ......
    3*(C-1) +1 to 3*CEntry C-1
     
    Each CLUT entry in turn comprises 3 bytes defining one colour in the red-green-blue colour space:
    Byte(s) of CLUT entry Intensity of Colour
    1Red
    2Green
    3Blue
     
A value of 'FF' means maximum intensity, so the definition 'FF' '00' 00' stands for fully saturated red.
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B.3  Colour Image Coding Scheme with Transparency |R6|Word‑p. 292
This coding scheme is identical to the Colour Image Coding Scheme as defined in appendix B.2, with the following exception:
  • Entry number C-1 in the colour look-up table (CLUT), where C is the number of entries in the CLUT, defines transparency. Raster image points which point to this entry are transparent, so that the underlying colour in the display is shown.
The three colour-coding bytes of entry number C-1 in the CLUT are of no importance when referenced from images using the '22' coding scheme.
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C  Structure of the Network parameters TLV objectsWord‑p. 293
Structure of the GSM network parameter TLV object, 0≤ m ≤32
Tag Length Tag Currently Camped Frequency Length BCCH Frequency downlink Tag Neighbour BCCH Frequency Length BCCH Neighbour Frequency 1 BCCH Neighbour Frequency 2 BCCH Neighbour Frequency m
'A0' '80' '02' '81'
 
Structure of the FDD network parameter TLV object, 0 ≤ m ≤ 32
Tag Length Tag Intra frequency carrier Length Intra Frequency downlink carrier Primary Scrambling code 1 Primary Scrambling code m Tag Inter frequency carrier Length Inter Frequency downlink carrier Primary Scrambling code n1
'A1' '80' '81'
 
Structure of the TDD network parameter TLV object, 0 ≤ m ≤ 32
Tag Length Tag Intra frequency carrier Length Intra Frequency downlink carrier Primary Scrambling code 1 Primary Scrambling code m Tag Inter frequency carrier Length Inter Frequency downlink carrier Primary Scrambling code n1
'A2' '80' '81'
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