Table C.7.6.23-1 specifies the Attributes of the Enhanced Palette Color Lookup Table Module, which define data flow through the Enhanced Blending and Display Pipeline. See Section C.7.6.23.1 for an overview of the Enhanced Blending and Display Pipeline.
Table C.7.6.23-1. Enhanced Palette Color Lookup Table Module Attributes
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Sequence of Items each assigning frames of one particular value of Data Type (0018,9808) to a data path in the Enhanced Blending and Display Pipeline. One, two, or three Items shall be included in this Sequence. |
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Identification of the data type of frames using this data path assignment. |
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The data path to use for this data type in the Enhanced Blending and Display Pipeline. See Section C.7.6.23.2 for usage. |
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The number of most significant bits of each value of Pixel Data (7FE0,0010) from this frame contributing to the Palette Color Lookup Table input. If absent, Bits Stored (0028,0101) bits of each value of Pixel Data (7FE0,0010) from this frame contributes to the Palette Color Lookup Table input. See Section C.7.6.23.3 for usage. |
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Specification of the weight of the primary path input to the Blending Operation, i.e., the value that is referred to as "Weight 1" in the Enhanced Blending and Display Pipeline. Only a single Item shall be included in this Sequence. Required if there are one or more Items of the Data Path Assignment Sequence (0028,1402) other than PRIMARY_PVALUES. |
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Specifies the algorithm used to determine the output value of Blending LUT 1. See Section C.7.6.23.4 for details. |
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Constant value of the Weight input to blending operation. Shall be from 0.0 to 1.0, inclusive. Required if Blending LUT 1 Transfer Function (0028,1405) is CONSTANT. |
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Specifies the format of Blending Lookup Table Data (0028,1408) in this Sequence Item. The second value (first stored pixel value mapped) shall be zero. See Section C.7.6.23.5 for further explanation. Required if Blending LUT 1 Transfer Function (0028,1405) is TABLE. |
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Contains the Blending Lookup Table values for this Weight input to the Blending Operation. Required if Blending LUT 1 Transfer Function (0028,1405) is TABLE. |
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Specification of the weight of the secondary path input to the Blending Operation, i.e., the value that is referred to as "Weight 2" in the Enhanced Blending and Display Pipeline. Only a single Item shall be included in this Sequence. Required if there are one or more Items of the Data Path Assignment Sequence (0028,1402) other than PRIMARY_PVALUES. |
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Specifies the algorithm used to determine the output value of Blending LUT 2. See Section C.7.6.23.4 for details. |
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Constant value of the Weight input to blending operation. Shall be from 0.0 to 1.0, inclusive. Required if Blending LUT 2 Transfer Function (0028,140D) is CONSTANT. |
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Specifies the format of Blending Lookup Table Data (0028,1408) in this Sequence Item. The second value (first stored pixel value mapped) shall be zero. See Section C.7.6.23.5 for further explanation. Required if Blending LUT 2 Transfer Function (0028,140D) is TABLE. |
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Contains the Blending Lookup Table values for this Weight input to the Blending operation. Required if Blending LUT 2 Transfer Function (0028,140D) is TABLE. |
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This Sequence contains the Palette Color Lookup Table. One or two Items shall be included in this Sequence. Required if Data Path Assignment (0028,1402) is present with a value other than PRIMARY_PVALUES. |
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Identifier of the data path in which this Palette Color Lookup Table is used. |
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Specifies the mapping that takes place between the input value and RGB input to the Blending Operation. |
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Specifies the transformation that is used to create the Alpha input to the Blending LUTs. |
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Specifies the format of the Red Palette Color Lookup Table Data (0028,1201). The second value (first stored pixel value mapped) shall be zero. |
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Specifies the format of the Green Palette Color Lookup Table Data (0028,1202). The second value (first stored pixel value mapped) shall be zero. |
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Specifies the format of the Blue Palette Color Lookup Table Data (0028,1203). The second value (first stored pixel value mapped) shall be zero. |
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Specifies the format of the Alpha Palette Color Lookup Table Data. The second value (first stored pixel value mapped) shall be zero. Required if Alpha LUT Transfer Function (0028,1410) is TABLE. |
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Alpha LUT contains the blending values for the data frames. Required if Alpha LUT Transfer Function (0028,1410) is TABLE. |
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An ICC Profile encoding the transformation of device-dependent color stored pixel values into PCS-Values. When present, defines the color space of the output of the Enhanced Blending and Display Pipeline. Required if Data Path Assignment (0028,1402) is present and there exists any value other than PRIMARY_PVALUES. |
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A label that identifies the well-known color space of the image. Shall be consistent with any ICC Profile (0028,2000) that is also present. See Section C.11.15.1.2. |
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The Enhanced Blending and Display Pipeline describes a scheme for blending of data frames of different Data Types and a color/grayscale mapping for display recommended by the provider of this information. There are no requirements upon an receiving application to utilize this recommendation in the processing and display of the referenced image.
The blending transformation model in Figure C.7.6.23-1 applies for mapping images derived from one, two, or three data frames with the same image position and orientation but of different values of Data Type (0018,9808) to grayscale P-Values or color PCS-values for presentation. These inputs to the pipeline are frames of pixel values obtained from Pixel Data (7FE0,0010) and structured as described by Attributes of the Image Pixel Module. Co-located pixels from each data frame are processed through the Pipeline, resulting in one output sample at that location.
The model utilizes up to two data paths called the Primary and the Secondary data paths. Each input data frame may be initially processed by a Modality LUT and a VOI LUT. If not explicitly specified, the Modality LUT and VOI LUT are assumed to be identity transformations. The Primary path may be used alone to obtain only grayscale transformation without blending. In this case, the Primary data path input after going through the Modality LUT and VOI LUT is mapped through a Presentation LUT to obtain device independent grayscale values (P-Values) for presentation.
Either Primary or Secondary paths alone or both paths together may be used to obtain color transformation with blending. Up to one data frame input in the Primary data path and up to two data frames input in the Secondary data path are allowed for this blending transformation. These frames may be mapped to color using one-input or two-input palette color lookup tables depending on the number of data frames input to the data path. Alternatively if a path has one data frame, values may be converted to RGB (where R=G=B) before blending, if pseudo-color presentation of this data path is not desired. RGB values from Primary and Secondary data paths are combined via a "Blending Operation" in which the RGB color components are multiplied by a corresponding blending weight function (Weight 1 and Weight 2, respectively), and for each color component the two products are added together to produce the blended output value of that component. All inputs to the Blending Operation are normalized to the range 0.0 to 1.0, inclusive, even if they are fixed integer values that had been the entries in a lookup table.
Each of the Weight inputs to the blending operation is the output of a corresponding Blending LUT Transfer Function, which is selectable as either a constant or a derivation of the data frame values as described in Section C.7.6.23.4.
The RGB output from the Blending Operation is clamped to limit each color component (R, G, and B) to fall within the range 0.0 to 1.0, inclusive. The clamping function simply sets the value of any color component to 1.0 if the output from the Blending operation for that component exceeds 1.0. The RGB output of the clamping function is made available for use in rendering and slicing algorithms. Further, the output of the clamping function is transformed by the Profile Connection Space Transformation to device independent color values (PCS-values) for presentation.
If the input data frame values are representative of real world data, then they can be mapped to the Real World Values and units using the Section C.7.6.16.2.11 Real World Value Mapping Macro.
Note
Annex QQ “Enhanced US Data Type Blending Examples (Informative)” in PS3.17 describes a number of examples of the Enhanced Blending and Display Pipeline with specific Attribute values for each example that invoke particular data flows through the pipeline.
