Xilinx pg013 LogiCORE IP RGB to YCrCb Color-Space Converter v5 ...

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Color-Space Conversion BackgroundTable 4-3:Standard ITU 709 (HD) 1250/50 (PAL)Parameterization Values for the PAL HD (ITU 709) StandardCoefficient/ParameterYUV StandardRange16-240 16-235 0-255CA 0.2126 0.1819CB 0.0722 0.0618CC 0.6350 0.6495 0.6495CD 0.5389 0.5512YOFFSET2 Data_Width-4Cb/CrOFFSET2 Data_Width-1YMAX 240*2 Data_Width-8 235*2 Data_Width-8 2 Data_Width -1Cb/CrMAX 240*2 Data_Width-8 235*2 Data_Width-8 2 Data_Width -1YMIN 16*2 Data_Width-8 0Cb/CrMIN 16*2 Data_Width-8 0Table 4-4:Parameterization Values for the YUV StandardCoefficient/ParameterValue16-240 16-235 0-255CA 0.299CB 0.114CC 0.877283CD 0.492111YOFFSET2 Data_Width-4Cb/CrOFFSET2 Data_Width-1YMAX 240*2 Data_Width-8 235*2 Data_Width-8 2 Data_Width -1Cb/CrMAX 240*2 Data_Width-8 235*2 Data_Width-8 2 Data_Width -1YMIN 16*2 Data_Width-8 0Cb/CrMIN 16*2 Data_Width-8 0RGB to YCrCb Color-Space Converter www.xilinx.com 36PG013 April 24, 2012
Color-Space Conversion BackgroundHardware ImplementationThe RGB to YCrCb color space transformation equations (Equation 4-5) can be expressed as:Y = CA∗( R – G) + G + CB∗( B – G) + YOFFSETEquation 4-9Cr = CC∗( R – Y) + CrOFFSETEquation 4-10Cb = CD∗( B – Y) + CbOFFSETEquation 4-11These equations can be directly mapped to the architecture shown in Figure 4-3. The blueboxes in Figure 4-3 represent logic blocks, which are always implemented using XtremeDSPslices.X-Ref Target - Figure 4-3RoundingClipping ClampingGMWIDTH-1YR-ACMWIDTH-2YOFFSET YMAXYMINB-MWIDTHCCOEF CBOFFSET CBMAX CBMINCbCrBCDCOEFCROFFSET CRMAXCRMINDS657_02_032408Figure 4-3:Application SchematicError AnalysisThe following analysis, based on DSP fundamentals, presents mean-square-error (MSE)calculations for RGB to YCrCb, assuming IWIDTH bit RGB input data, OWIDTH bit wideYCrCb output data, and 17 bits for coefficient precision. [Ref 7] arrives to similar results forfixed coefficient values and input and output representations.Taking rounding/quantization into account, the structure illustrated on Figure 4-3implements the following equations:Y RAW = [ ACOEF ⋅ ( R – G)+ BCOEF ⋅ ( B – G)] MWIDTH – 2 + GY = [ Y RAW ] OWIDTH+ YOFFSETEquation 4-12Equation 4-13RGB to YCrCb Color-Space Converter www.xilinx.com 37PG013 April 24, 2012
Page 1 and 2: LogiCORE IP RGB toYCrCb Color-Space
Page 3 and 4: Clock Placement. . . . . . . . . .
Page 5 and 6: LogiCORE IP RGB to YCrCbColor-Space
Page 7 and 8: Licensing• Video surveillance•
Page 9 and 10: Resource UtilizationResource Utiliz
Page 11 and 12: Core Interfaces and Register SpaceX
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Page 15 and 16: Core Interfaces and Register SpaceC
Page 17 and 18: Core Interfaces and Register SpaceT
Page 19 and 20: Core Interfaces and Register SpaceE
Page 21 and 22: Core Interfaces and Register SpaceC
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Page 25 and 26: Graphical User InterfaceThe main sc
Page 27 and 28: Graphical User InterfaceThe previou
Page 29 and 30: Parameter Values in the XCO FilePar
Page 31 and 32: Chapter 4Designing with the CoreGen
Page 33 and 34: Color-Space Conversion BackgroundYU
Page 35: Color-Space Conversion BackgroundCC
Page 39 and 40: Color-Space Conversion BackgroundTh
Page 41 and 42: Clock, Enable, and Reset Considerat
Page 43 and 44: System ConsiderationsARESETnThe RGB
Page 45 and 46: Chapter 5Constraining the CoreRequi
Page 47 and 48: Chapter 6Detailed Example DesignNo
Page 49 and 50: Directory and File Contents• run_
Page 51 and 52: InteroperabilityInteroperabilityThe
Page 53 and 54: Appendix CDebuggingIt is recommende
Page 55 and 56: Debugging FeaturesTable C-2:Trouble
Page 57 and 58: Interfacing to Third-Party IPOften
Page 59 and 60: Appendix DApplication Software Deve
Page 61 and 62: Programmer’s GuideRGB_AutoSyncRes
Page 63 and 64: Appendix EC-Model ReferenceInstalla
Page 65 and 66: Using the C-ModelTable E-2:C-Model
Page 67 and 68: Using the C-ModelTable E-4: Member
Page 69 and 70: Using the C-Modelthe video mode val
Page 71 and 72: Compiling with the RGB to YCrCb C-M
Page 73 and 74: ReferencesReferencesThese documents

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