ISO IEC 16485 pdf download – Information technology — Mixed Raster Content (MRC)

ISO IEC 16485 pdf download – Information technology — Mixed Raster Content (MRC)
1
Scope
This Recommendation defines a means to efficiently represent raster-oriented pages that contain amixture of multi-level and bi-level images. Any of the many ITU-T recommended encoding schemes,such as T.81(JPEG) for the encoding of multi-level images and T.6(MMR) for the encoding of bi-levelimages, may be combined within the context of this Recommendation.Similarly, ITU-T spatial and
colour resolutions may be combined within a page.This Recommendation does not define new encodingsor resolutions.The method of image segmentation is beyond the scope of this Recommendation,
segmentation is left to manufacturers’ implementation.
2References
The following ITU-T Recommendations, and other references contain provisions,which throughreference in this text, constitute provisions of this Recommendation.At the time of publication, the
editions indicated were valid.All Recommendation and other references are subject to revision; all usersof this Recommendation are therefore encouraged to investigate the possibility of applying the most
recent edition of the Recommendation and other references listed below.A list of the currently valid ITU-T Recommendations is regularly published.
ITU-T Recommendation T.4 (1996) – Standardization of Group 3 facsimile terminals fordocument transmission.
cCITT Recommendation T.6 (1988) – Facsimile coding schemes and coding control functionsfor Group 4 facsimile apparatus.(Commonly referred to as MMR standard.)
ITU-T Recommendation T.42 (1996) – Continuous-tone colour representation method forfacsimile.
ITU-T Recommendation T.43 (1997) – Colour and gray-scale image representation usinglossless coding scheme for facsimile.
CCITT Recommendation T.81 (1992)| ISO/IEC 10918-1:1994 – Information technology – Digitalcompression and coding of continuous-tone still image – Requirements and guidelines.
(Commonly referred to as JPEG standard.)
ITU-T Recommendation T.82 (1993)|ISO/IEC 11544:1993 – Information technology – Codedrepresentation of picture and audio information – Progressive bi-level image compression.(Commonly referred to as JBIG standard.)
ITU-T Recommendation T.86 (1998)|ISO/IEC 10918-4:1999 – Information technology – Digitalcompression and coding of continuous-tone sill images: Registration of JPEG profiles, SPIFFprofiles,SPIFF tags, SPIFF colour spaces,APPN markers,SPIFF compression types andRegistration Authorities (REGAUT).
ITU-T Recommendation T.85 (1995) – Application profile for Recommendation T.82 -Progressive bi-level image compression (JBIG coding scheme for facsimile apparatus).
3Definitions
The definitions contained in Recommendations T.4,T.6,T.42,T.43,T.81,T.82 and T.85 apply,unlessexplicitly amended.
APP13 Marker: Encoded as X’FFED’, is the application marker, registered per Recommendation T.86,that uniquely identifies MRC.
End of page (EOP), encoded as two consecutive JPEG EOI(X’FFD9FFD9′).
Joint Bi-level Image Experts Group(JBIG), and also shorthand for the encoding method, described inRecommendation T.82, which was defined by this group.
NOTE – It is expected that JBIG will be changed to JBIGl when referencing Recommendation T.82.Thisnomenclature change is the result of a new standard that is being developed by the JBlG committee.Thisnew standard will be referenced as JBIG2.
Joint Photographic Experts Group(JPEG), and also shorthand for the encoding method, described inRecommendation T.81, which was defined by this group.
layer: An image, either multi-level or bi-level, that is to be combined with other images using the methoddescribed here. Layers are encoded using ITU-T coding methods. One or more layers may be used.
background layer: The “bottom” layer (layer 1), multi-level data associated with a contone image
segment, in a 3-layer segmentation of a page containing a combination of bi-level and multi-level images.At background pixel locations where the contone background image is not present, a background layerbase colour (default of white) is applied. A means to define other values of background layer base colouris provided within the syntax described in clause 9.
contone layer: Continuous-tone andor palletized colour. This definition is intended to account for bothscanner and synthetic source image data. When a scanner is the source of an image, both continuous-toneand solid coloured images would be available as continuous-tone data. When the source of an image issynthetic, continuous-tone and solid coloured images may be available as continuous-tone or palletizedcolour data.
foreground layer: The “top” layer (layer 3), multi-level data associated with colours of text, graphics orline-art, in a 3-layer segmentation of a page containing a combination of bi-level and multi-level images.At foreground pixel locations where the multi-level data associated with colours of text, graphics or line-art is not present, a foreground layer base colour (default of black) is applied. A means to define othervalues of foreground layer base colour is provided within the syntax described in clause 9.
image layer: Odd-numbered layer (e.g.layers 1, 3,5,…), multi-level data associated with contoneimages, colours of texts, graphics or line-art, in a multi-layer segmentation of a page containing acombination of bi-level and multi-level images.
At image layer pixel locations, above layer 1, where the image is not present, a layer base colour, defaultof black, is applied.At layer 1 pixel locations where the image is not present, a layer base colour, defaultof white, is applied.A means to define other layer base colour values is provided within the syntax
described in clause 9.