How to look for an image on a VM screen

LookForBitmap.ps1

$VMName = "Windows"

# Load System.Drawing
Add-Type -AssemblyName "System.Drawing"

# Load AForge libraries - download from http://www.aforgenet.com/framework/
Add-Type -Path "D:\aForge\Release\AForge.dll"
Add-Type -Path "D:\aForge\Release\AForge.Math.dll"
Add-Type -Path "D:\aForge\Release\AForge.Imaging.dll"
# Number parameter is percentage threshold for acuracy.  0.9 = 90% match
$tm = New-Object Aforge.Imaging.ExhaustiveTemplateMatching(0.98)

# Image to match
$imageToMatch = New-Object System.Drawing.Bitmap "C:\Users\benja\Desktop\PShell.bmp"

$VMMS = Get-WmiObject -Namespace root\virtualization\v2 -Class Msvm_VirtualSystemManagementService 
$VMCS = Get-WmiObject -Namespace root\virtualization\v2 -Class Msvm_ComputerSystem -Filter "ElementName='$($VMName)'" 

# Get the resolution of the screen at the moment
$video = $VMCS.GetRelated("Msvm_VideoHead")
$xResolution = $video.CurrentHorizontalResolution[0]
$yResolution = $video.CurrentVerticalResolution[0]

function getVMScreenBMP {
    param
    (
        $VM,
        $x,
        $y
    )

    $VMMS = Get-WmiObject -Namespace root\virtualization\v2 -Class Msvm_VirtualSystemManagementService

    # Get screenshot
    $image = $VMMS.GetVirtualSystemThumbnailImage($VMCS, $x, $y).ImageData

    # Transform into bitmap
    $BitMap = New-Object System.Drawing.Bitmap -Args $x,$y,Format16bppRgb565
    $Rect = New-Object System.Drawing.Rectangle 0,0,$x,$y
    $BmpData = $BitMap.LockBits($Rect,"ReadWrite","Format16bppRgb565")
    [System.Runtime.InteropServices.Marshal]::Copy($Image, 0, $BmpData.Scan0, $BmpData.Stride*$BmpData.Height)
    $BitMap.UnlockBits($BmpData)

    # Convert from 16bppRgb565 to 24bppRgb
    $RightFormatImage =  New-Object System.Drawing.Bitmap -Args $BitMap.Width,$BitMap.Height,Format24bppRgb
    $graphics = [System.Drawing.Graphics]::FromImage($RightFormatImage)
    $graphics.DrawImage($BitMap, (New-Object System.Drawing.Rectangle(0, 0, $BitMap.Width, $BitMap.Height)))

    # Return converted image format
    return $RightFormatImage
}

$VMBitmap = getVMScreenBMP $VMCS $xResolution $yResolution

# List any image matches
$tm.ProcessImage($VMBitmap, $imageToMatch)