You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: PulseExtraction.m
    path of file: ./repos/FloWave.US/SourceCode
    
    the code of the file until where you have to start completion: function [VelType,VelAll,MeanVelAll,WtMeanVelAll,EnvelopeVelAll] = PulseExtraction(StartFrame,FramesPerPeriod,nFrames,USObj,BaseY1,VelCon,PlatSetFile)
%%% Pulse Wave Data Extraction 

    
function [VelType,VelAll,MeanVelAll,WtMeanVelAll,EnvelopeVelAll] = PulseExtraction(StartFrame,FramesPerPeriod,nFrames,USObj,BaseY1,VelCon,PlatSetFile)
%%% Pulse Wave Data Extraction 
% For all frames in the video, this code a) defines an ROI for the pulse
% wave data, b) extracts the time average mean data (calculated teal line),
% c) extracts the max doppler envelope (TAMax), and e) scales 
% the velocity and time data from pixels to the appropriate units.

% NOTE: If time average mean data is not displayed in real-time, the mean 
% of the doppler envelope may be used as an alternative. 

load(PlatSetFile)

% Initialize Variables that may not be necessary so the function can export
% all required values
VelAll = [];
MeanVelAll = [];
WtMeanVelAll = [];
EnvelopeVelAll = [];

% Create Loop for Batch Processing
count = 1; % Count the # of Screen Updates

% Select Velocity Extraction Method - TAMean or Raw
VelType = menu('Extract the calculated TAMean or the raw Doppler spectrum?', 'TAMean', 'Raw');

for k = StartFrame:FramesPerPeriod:nFrames
    
    % Restrict Video Data to Pulse Wave ROI - defined in platform
    % calibration
    vidframe = read(USObj,k);
    ROI(:,:,:) = vidframe(PWy(1):PWy(2),PWx(1):PWx(2),:);
    
    % Allocate Storage for Velocity Data
    VelValue = zeros(1,PWLength);
    MaxI = zeros(1,PWLength);
    VelPos = zeros(1,PWLength);
    
    if VelType == 1
        %Recast ROI as type double
        ROI_db = double(ROI);
        
        % Extract Time Average Mean Data
        % Teal Pixels defined by Red/Green & Red/Blue Ratio:
        % Default Settings: Low = 0.25 & High = 0.7
        % [RGB] of the TAMean line may need to be adjusted for different
        % equipment - Use PlatformCalibration.m to determine the system
        % settings.
        
        % Allocate memory for data extraction
        TAMeanData = zeros(PWHeight,PWLength,1);
        
        % For all pixels in ROI, keep teal pixels and convert to intensity
        for i = 1:PWHeight
            for j = 1:PWLength
                if ((ROI_db(i,j,1)/ROI_db(i,j,2) <= TealHigh) && ...
                        (ROI_db(i,j,1)/ROI_db(i,j,2) >= TealLow) && ...
                        (ROI_db(i,j,1)/ROI_db(i,j,3) <= TealHigh) && ...
                        (ROI_db(i,j,1)/ROI_db(i,j,3) >= TealLow))
                    
                    I = 1/3*(ROI_db(i,j,1)+ROI_db(i,j,2)+ROI_db(i,j,3));
                    TAMeanData(i,j,:) = I;
                end