Project Name: RGBtoYCbCr.dpj

Project Type:
    ADSP-BF533 [X]
    ADSP-BF537 [ ]
    ADSP-BF561 [ ]

Hardware Used:
    ADSP-BF533 EZ-Kit
    VisualDSP++ Emulator

System Services Components Used:
    None


OVERVIEW
========
The RGBtoYCbCr function takes input (R, G, B) in the range of 0 to 255 and outputs
(Y, Cb and Cr) also in the range of 0 to 255.  The formula’s implementation is
represented by the diagram below.

            Y  = 0.299R  +  0.587G  +  0.114B
            Cb = -0.169R -  0.331G  +  0.500B + 128
            Cr = 0.500R  -  0.419G  -  0.081B + 128

128 is added to Cb and Cr to get the output in the range 0 to 255.

For this function to work properly, the input must be gamma corrected values in the
order RGB order and the result will be stored in YCbCr order.

Prototype :
     void RGBtoYCbCr(unsigned char input[], unsigned char out[], int N);

Arguments:
      input[] - Input RGB array
      out[]   - Out put  array to store in YCbCr format
      N      - Number of inputs

Registers Used  : A0, A1, R0-R3, R5-R7, I1, B1, M0, L1, P0-P2, LC0.




RUNNING THE APPLICATION (on the ADSP-BF533 EZ-KIT Lite)
===========================================================

1) Load project "RGBtoYCbCr.dpj".

2) Select "Project->Rebuild Project"

3) Select "Debug->Run".

4) Observe output on VisualDSP++ console window.





Files in This Application
==========================

This example consists of the following files:

    "./RGBtoYCbCr.ldf" - linker description file
    "./RGBtoYCbCr.dpj" - project file
    "../../src/t_RGBtoYCbCr.c" -  source file
    "../../src/RGBtoYCbCr.asm" -  source file
    "../../../../BFinUtils/ADSP-BF533/SDK-cycle_count.asm" -  source file
    "../../../../Include/SDK-cycle_count.h" -  include file
    "../../include/color_cnvr.h" -  include file