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: find_unsaturatedPixels.m
    path of file: ./repos/MIN1PIPE/utilities/CNMF
    
    the code of the file until where you have to start completion: function normalPixels = find_unsaturatedPixels(Y, saturationValue, saturationThreshold, saturationTime)

% finds the pixels/voxels that are saturated and returns the ones that are
% not. A pixel is defined as saturated if its observed fluorescence is
% above saturationThreshold*saturationValue at least saturationTime
% fraction of the time.

    
function normalPixels = find_unsaturatedPixels(Y, saturationValue, saturationThreshold, saturationTime)

% finds the pixels/voxels that are saturated and returns the ones that are
% not. A pixel is defined as saturated if its observed fluorescence is
% above saturationThreshold*saturationValue at least saturationTime
% fraction of the time.

% Written by Weijian Yang and Eftychios A. Pnevmatikakis, based on an idea
% from Weijian Yang and Darcy Peterka

if nargin < 4 || isempty(saturationTime)
    saturationTime = 0.005;
end