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annotate OrthancStone/Resources/Documentation/Coordinates.txt @ 1779:9ab251c03eda

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unit test VolumeRendering.TextureCorners
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 14 May 2021 10:01:20 +0200
parents fca942f4b4a7
children 20a0aba0ede5
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1775
fca942f4b4a7 fix conversion from voxel centers to texture borders
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1
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2 Some notes about the coordinate systems
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3 =======================================
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4
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5 * The 3D coordinates are expressed in the PATIENT system, *not* the
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6 "gantry" coordinates. As a consequence, the tags "Image Position
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7 Patient" (0020,0032) and "Image Orientation Patient" (0020,0037)
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8 describe the 3D geometry of a slice.
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9
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10 * The tag "Patient Position" (0018,5100) could be used to convert from
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11 patient coordinates to gantry coordinates, but this would be useful
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12 to device manufacturers, whereas Stone primarly deals with users of
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13 modalities.
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15 * The "Image Position Patient" gives the 3D coordinates of the CENTER
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9ab251c03eda unit test VolumeRendering.TextureCorners
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16 of the top-left voxel of slice.
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18 * In 2D compositors, the origin of a texture corresponds to the CORNER
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9ab251c03eda unit test VolumeRendering.TextureCorners
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19 of the top-left pixel of the texture (*not* to the center of this
9ab251c03eda unit test VolumeRendering.TextureCorners
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20 pixel). Roughly speaking, the operation "floor()" must be applied to
9ab251c03eda unit test VolumeRendering.TextureCorners
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21 move from canvas coordinates (floating-point numbers) to pixel
9ab251c03eda unit test VolumeRendering.TextureCorners
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22 coordinates in the image buffer (integer numbers).
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24 * The classes deriving from "IVolumeSlicer" must pay to attention to
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25 convert from centers of 3D voxels to bounding boxes of 2D pixels.