|  | G |
SECTION G — PHYSICS

|  | G |
Note(s) In this section, the following term is used with the meaning indicated: "variable" (as a noun) means a feature or property (e.g., a dimension, a physical condition such as temperature, a quality such as density or colour) which, in respect of a particular entity (e.g., an object, a quantity of a substance, a beam of light) and at a particular instant, is capable of being measured; the variable may change, so that its numerical expression may assume different values at different times, in different conditions or in individual cases, but may be constant in respect of a particular entity in certain conditions or for practical purposes (e.g., the length of a bar may be regarded as constant for many purposes). Attention is drawn to the definitions of terms or expressions used, appearing in the notes of several of the classes in this section, in particular those of "measuring" in class Fulltext... Hierarchy... Expanded...G01 and "control" and "regulation" in class Fulltext... Hierarchy... Expanded...G05. Classification in this section may present more difficulty than in other sections, because the distinction between different fields of use rests to a considerable extent on differences in the intention of the user rather than on any constructional differences or differences in the manner of use, and because the subjects dealt with are often in effect systems or combinations, which have features or parts in common, rather than "things", which are readily distinguishable as a whole. For example, information (e.g., a set of figures) may be displayed for the purpose of education or advertising (Fulltext... Hierarchy... Expanded...G09), for enabling the result of a measurement to be known (Fulltext... Hierarchy... Expanded...G01), for signalling the information to a distant point or for giving information which has been signalled from a distant point (Fulltext... Hierarchy... Expanded...G08). The words used to describe the purpose depend on features that may be irrelevant to the form of the apparatus concerned, for example, such features as the desired effect on the person who sees the display, or whether the display is controlled from a remote point. Again, a device which responds to some change in a condition, e.g., in the pressure of a fluid, may be used, without modification of the device itself, to give information about the pressure (Fulltext... Hierarchy... Expanded...G01L) or about some other condition linked to the pressure (another subclass of class Fulltext... Hierarchy... Expanded...G01, e.g., Fulltext... Hierarchy... Expanded...G01K for temperature), to make a record of the pressure or of its occurrence (Fulltext... Hierarchy... Expanded...G07C), to give an alarm (Fulltext... Hierarchy... Expanded...G08B), or to control another apparatus (Fulltext... Hierarchy... Expanded...G05). The classification scheme is intended to enable things of a similar nature (as indicated above) to be classified together. It is therefore particularly necessary for the real nature of any technical subject to be decided before it can be properly classified.

INSTRUMENTS

|  | G06 |
COMPUTING; CALCULATING; COUNTING (score computers for games Fulltext... Hierarchy... Expanded...A63B 71/06, Fulltext... Hierarchy... Expanded...A63D 15/20, Fulltext... Hierarchy... Expanded...A63F 1/18; combinations of writing implements with computing devices Fulltext... Hierarchy... Expanded...B43K 29/08)

|  | G06 |
Note(s) This class covers: simulators which are concerned with the mathematics of computing the existing or anticipated conditions within the real device or system; simulators which demonstrate, by means involving computing, the function of apparatus or of a system, if no provision exists elsewhere; image data processing or generation. This class does not cover: control functions derived from simulators, in general, which are covered by class Fulltext... Hierarchy... Expanded...G05, although such functions may be covered by the subclass of this class for the device controlled; measurement or analysis of an individual variable to serve as an input to a simulator, which is covered by class Fulltext... Hierarchy... Expanded...G01; simulators regarded as teaching or training devices which is the case if they give perceptible sensations having a likeness to the sensations a student would experience in reality in response to actions taken by him. Such simulators are covered by class Fulltext... Hierarchy... Expanded...G09; components of simulators, if identical with real devices or machines, which are covered by the relevant subclass for these devices or machines (and not by class Fulltext... Hierarchy... Expanded...G09). In this class, the following terms or expressions are used with the meanings indicated: "data" is used as the synonym of "information". Therefore, the term "information" is not used in subclasses Fulltext... Hierarchy... Expanded...G06C, Fulltext... Hierarchy... Expanded...G06F or Fulltext... Hierarchy... Expanded...G06Q; "calculating or computing" includes, inter alia, operations on numerical values and on data expressed in numerical form. Of these terms "computing" is used throughout the class; "computation" is derived from this interpretation of "computing". In the French language the term "calcul" will serve for either term; "simulator" is a device which may use the same time scale as the real device or operate on an expanded or compressed time scale. In interpreting this term models of real devices to reduced or expanded scales are not regarded as simulators; "record carrier" means a body, such as a cylinder, disc, card, tape, or wire, capable of permanently holding information, which can be read-off by a sensing element movable relative to the recorded information. Attention is drawn to the Notes following the title of section G, especially as regards the definition of the term "variable".

|  | G06T |
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL (specially adapted for particular applications, see the relevant subclasses, e.g. Fulltext... Hierarchy... Expanded...G01C, Fulltext... Hierarchy... Expanded...G06K, Fulltext... Hierarchy... Expanded...G09G, Fulltext... Hierarchy... Expanded...H04N) [6,8]

|  | G06T |
Note(s) This subclass covers: [6] arrangements for geometrically modelling objects, whether the final model is used for display of an image of the object or for some other purpose, such as manufacture of a corresponding object; [6] arrangements for analysing the geometric attributes of an image of an object. [6] This subclass does not cover: [6] photogrammetry or videogrammetry, which are covered by subclass Fulltext... Hierarchy... Expanded...G01C; [8] reading or recognising printed or written characters or recognising patterns, e.g. fingerprints, which is covered by subclass Fulltext... Hierarchy... Expanded...G06K; [6] modification of image data to allow display using multiple viewports, which is covered by subclass Fulltext... Hierarchy... Expanded...G09G; [6] circuits for generating functions for visual indicators, which are covered by subclass Fulltext... Hierarchy... Expanded...G09G; [6] scanning of documents or the like in pictorial communication, which is covered by subclass Fulltext... Hierarchy... Expanded...H04N. [6]

|  | G06T |
Subclass index
GENERAL PURPOSE IMAGE DATA PROCESSING | 1/00
GEOMETRIC IMAGE TRANSFORMATION IN THE PLANE OF THE IMAGE | 3/00
IMAGE ENHANCEMENT OR RESTORATION | 5/00
IMAGE ANALYSIS | 7/00
IMAGE CODING | 9/00
TWO DIMENSIONAL (2D) IMAGE GENERATION | 11/00
ANIMATION EFFECTS IN TWO DIMENSIONAL (2D) IMAGES | 13/00
THREE DIMENSIONAL (3D) IMAGE RENDERING | 15/00
THREE DIMENSIONAL (3D) MODELLING | 17/00

P:80 |  | G06T 1/00 |
General purpose image data processing [6]

|  | G06T 1/20 |
· | Processor architectures; Processor configuration, e.g. pipelining (architectures of general purpose stored programme computers Fulltext... Hierarchy... Expanded...G06F 15/76) [6]

|  | G06T 1/40 |
· · | Neural networks [6]

|  | G06T 1/60 |
· | Memory management [6]

P:40 |  | G06T 3/00 |
Geometric image transformation in the plane of the image, e.g. from bit-mapped to bit-mapped creating a different image [6]

|  | G06T 3/20 |
· | Linear translation of a whole image or part thereof, e.g. panning [6]

|  | G06T 3/40 |
· | Scaling of a whole image or part thereof [6]

|  | G06T 3/60 |
· | Rotation of a whole image or part thereof [6]

P:50 |  | G06T 5/00 |
Image enhancement or restoration, e.g. from bit-mapped to bit-mapped creating a similar image [6]

|  | G06T 5/10 |
· | by non-spatial domain filtering [6]

|  | G06T 5/20 |
· | by the use of local operators [6]

|  | G06T 5/30 |
· · | Erosion or dilatation, e.g. thinning [6]

|  | G06T 5/40 |
· | by the use of histogram techniques [6]

|  | G06T 5/50 |
· | by the use of more than one image, e.g. averaging, subtraction [6]

P:60 |  | G06T 7/00 |
Image analysis, e.g. from bit-mapped to non bit-mapped [6]

|  | G06T 7/20 |
· | Analysis of motion [6]

|  | G06T 7/40 |
· | Analysis of texture [6]

|  | G06T 7/60 |
· | Analysis of geometric attributes, e.g. area, centre of gravity, perimeter, from an image [6]

P:70 |  | G06T 9/00 |
Image coding, e.g. from bit-mapped to non bit-mapped (compression in general Fulltext... Hierarchy... Expanded...H03M; compression for image communication Fulltext... Hierarchy... Expanded...H04N) [6]

|  | G06T 9/20 |
· | Contour coding, e.g. using detection of edges [6]

|  | G06T 9/40 |
· | Tree coding, e.g. quadtree, octree [6]

P:30 |  | G06T 11/00 |
Two dimensional (2D) image generation, e.g. from a description to a bit-mapped image [6]

|  | G06T 11/20 |
· | Drawing from basic elements, e.g. line, circle, chart [6]

|  | G06T 11/40 |
· | Filling a planar surface, i.e. by adding colour or texture [6]

|  | G06T 11/60 |
· | Editing figures and text; Combining figures or text [6]

|  | G06T 11/80 |
· | Creating or modifying a manually drawn or painted image using a manual input device, e.g. mouse, light pen, direction keys on keyboard [6]

P:20 |  | G06T 13/00 |
Animation effects in two dimensional (2D) images, e.g. using sprites [6]

P:10 |  | G06T 15/00 |
Three dimensional (3D) image rendering, e.g. from a model to a bit-mapped image [6]

|  | G06T 15/10 |
· | Geometric effects [6]

|  | G06T 15/20 |
· · | Perspective computation [6]

|  | G06T 15/30 |
· · | Clipping [6]

|  | G06T 15/40 |
· · | Hidden part removal [6]

|  | G06T 15/50 |
· | Lighting effects, e.g. shading [6]

|  | G06T 15/60 |
· · | Shadowing [6]

|  | G06T 15/70 |
· | Animation effects [6]

P:0 |  | G06T 17/00 |
Three dimensional (3D) modelling, e.g. data description of 3D objects [6]

|  | G06T 17/10 |
· | Constructive solid geometry (CSG) using solid primitives, e.g. cylinders, cubes [6]

|  | G06T 17/20 |
· | Finite element generation, e.g. wire-frame surface description [6]

|  | G06T 17/30 |
· | Polynomial surface description [6]

|  | G06T 17/40 |
· | Manipulating 3D images, e.g. using CAD graphics workstations [6]

|  | G06T 17/50 |
· | Geographic models [6]