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Adds outlier detection, expands database for columns as follows: mMrn…
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…gRawP4Outlier,mMrngP4Outlier,mAvgDistRed ,mAvgDistGreen,mAvgDistBlue,mMedRed,mMedGreen,mMedBlue
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@StefanKutschera
StefanKutschera committed Mar 25, 2022
1 parent 753bc46 commit 7f3da13
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Showing 2 changed files with 133 additions and 7 deletions.
104 changes: 99 additions & 5 deletions app/src/main/java/science/credo/mobiledetector/detection/CameraPreviewCallbackNative.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,10 @@ import java.io.*
import java.nio.channels.FileChannel
import java.util.*
import java.util.concurrent.atomic.AtomicInteger
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.min
import kotlin.math.round

const val MAX_HITS_ONE_FRAME = 5

Expand Down Expand Up @@ -213,8 +215,6 @@ class CameraPreviewCallbackNative(private val mContext: Context) : Camera.Previe


val epsilon = 21;
var pxTxt = ""
var mrngpx = ""
var rgbPx = ""
var potPixelError = false

Expand All @@ -227,12 +227,26 @@ class CameraPreviewCallbackNative(private val mContext: Context) : Camera.Previe
var mrngP3Color = ""
var mrngRawP3Color = ""

var mrngP4Outlier = ""
var mrngRawP4Outlier = ""


var prevRed = -1
var prevGreen = -1
var prevBlue = -1

var absDistRed = 0
var absDistGreen = 0
var absDistBlue = 0

var redArr : MutableList<Int> = ArrayList()
var greenArr : MutableList<Int> = ArrayList()
var blueArr : MutableList<Int> = ArrayList()

// Extract Randomness out of bit flipped pixels
for (x in 0 until cropBitmap.getWidth()) {
for (y in 0 until cropBitmap.getHeight()) {
var px = cropBitmap.getPixel(x, y)
pxTxt = pxTxt + px
mrngpx = mrngpx + (px%2)
var red = Color.red(px)
var green = Color.green(px)
var blue = Color.blue(px)
Expand All @@ -242,9 +256,68 @@ class CameraPreviewCallbackNative(private val mContext: Context) : Camera.Previe
mrngRawP3Color = mrngRawP3Color + red + ";" + green + ";" + blue + ";" + alpha + ";" + x +";" + y +";\n"
mrngP3Color = mrngP3Color + ((red%2) + (green%2) + (blue%2))%2
}
if (prevRed > 0 || prevGreen > 0 || prevBlue > 0) {
absDistRed = absDistRed + abs(prevRed - red)
absDistGreen = absDistGreen + abs(prevGreen - green)
absDistBlue = absDistBlue + abs(prevBlue - blue)
}
redArr.add(red)
greenArr.add(green)
blueArr.add(blue)

prevRed = red
prevGreen = green
prevBlue = blue
}
}

redArr.sort()
greenArr.sort()
blueArr.sort()
val medRed = redArr[round(redArr.size/2.toDouble()).toInt()]
val medGreen = greenArr[round(redArr.size/2.toDouble()).toInt()]
val medBlue = blueArr[round(redArr.size/2.toDouble()).toInt()]

val pixelCount = cropBitmap.getWidth() * cropBitmap.getHeight()
val avgDistRed = absDistRed / pixelCount.toDouble()
val avgDistGreen = absDistGreen / pixelCount.toDouble()
val avgDistBlue = absDistBlue / pixelCount.toDouble()
val outlierMultiplier = 6

var locDistRed = -1
var locDistGreen = -1
var locDistBlue = -1

// 2nd Round Extract Outliers for Randomness out of bit flipped pixels
for (x in 0 until cropBitmap.getWidth()) {
for (y in 0 until cropBitmap.getHeight()) {
var px = cropBitmap.getPixel(x, y)
var red = Color.red(px)
var green = Color.green(px)
var blue = Color.blue(px)
var alpha = Color.alpha(px)

if (prevRed > 0 || prevGreen > 0 || prevBlue > 0) {
locDistRed = abs(prevRed - red)
locDistGreen = abs(prevGreen - green)
locDistBlue = abs(prevBlue - blue)
}

if (red > epsilon || green > epsilon || blue > epsilon) {
if (locDistRed > avgDistRed * outlierMultiplier || locDistGreen > avgDistGreen * outlierMultiplier || locDistBlue > avgDistBlue * outlierMultiplier) {
mrngRawP4Outlier =
mrngRawP4Outlier + red + ";" + green + ";" + blue + ";" + alpha + ";" + x + ";" + y + ";\n"
mrngP4Outlier =
mrngP4Outlier + ((red % 2) + (green % 2) + (blue % 2)) % 2
}
}

prevRed = red
prevGreen = green
prevBlue = blue
}
}

val mrngBitString = mrngP1Time + mrngP2Position + mrngP3Color
if (mrngP3Color.length<=2)
potPixelError = true
Expand Down Expand Up @@ -274,11 +347,19 @@ class CameraPreviewCallbackNative(private val mContext: Context) : Camera.Previe
mrngRawP1Time,
mrngRawP2Position,
mrngRawP3Color,
mrngRawP4Outlier,
mrngP1Time,
mrngP2Position,
mrngP3Color,
mrngP4Outlier,
mrngBitString,
potPixelError
potPixelError,
avgDistRed,
avgDistGreen,
avgDistBlue,
medRed,
medGreen,
medBlue
)
hits.add(hit)

Expand All @@ -297,10 +378,23 @@ class CameraPreviewCallbackNative(private val mContext: Context) : Camera.Previe
val myfile = File(directory,mrngFile)

myfile.printWriter().use { out ->
out.println("MRNG Sequence:")
out.println(mrngBitString)
out.println("Timestamp:")
out.println(timeStampString)
out.println("Abs. Position:")
out.println("" + centerX + ";" + centerY)
out.println(rgbPx)
out.println("Outlier Stats:")
out.println("avgDistRed:" +avgDistRed)
out.println("avgDistGreen:" +avgDistGreen)
out.println("avgDistBlue:" +avgDistBlue)
out.println("medRed:" +medRed )
out.println("medGreen:" +medGreen )
out.println("medBlue:" +medBlue)
out.println("Outlier:")
out.println(mrngRawP4Outlier)
out.println(mrngP4Outlier)
}
} catch (e: Exception) {
e.printStackTrace()
Expand Down
36 changes: 34 additions & 2 deletions app/src/main/java/science/credo/mobiledetector/detection/Hit.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -37,11 +37,19 @@ class Hit (frameContent: String,
mrngRawP1Time: Int,
mrngRawP2Position: String,
mrngRawP3Color: String,
mrngRawP4Outlier: String,
mrngP1Time: String,
mrngP2Position: String,
mrngP3Color: String,
mrngP4Outlier: String,
mrngBitString: String,
potPixelError: Boolean?
potPixelError: Boolean?,
avgDistRed: Double,
avgDistGreen: Double,
avgDistBlue: Double,
medRed: Int,
medGreen: Int,
medBlue: Int
){
@PrimaryKey
@AutoIncrement
Expand Down Expand Up @@ -124,6 +132,9 @@ class Hit (frameContent: String,
@JsonIgnore
val mMrngRawP3Color: String = mrngRawP3Color

@JsonIgnore
val mMrngRawP4Outlier: String = mrngRawP4Outlier

@JsonIgnore
val mMrngP1Time: String = mrngP1Time

Expand All @@ -133,11 +144,32 @@ class Hit (frameContent: String,
@JsonIgnore
val mMrngP3Color: String = mrngP3Color

@JsonIgnore
val mMrngP4Outlier: String = mrngP4Outlier

@JsonIgnore
val mMrngBitString: String = mrngBitString

@JsonIgnore
val mPotPixelError: Boolean? = potPixelError

constructor() : this("", 0, 0.0, 0.0, 0.0, 0.0f, "", 0, 0, 0, 0, 0, 0.0, 0.0, 0, 0f, 0f, 0f, 0f, 0, 0,0 ,"" ,"" , "", "", "", "", null) {}
@JsonIgnore
val mAvgDistRed: Double = avgDistRed

@JsonIgnore
val mAvgDistGreen: Double = avgDistGreen

@JsonIgnore
val mAvgDistBlue: Double = avgDistBlue

@JsonIgnore
val mMedRed: Int = medRed

@JsonIgnore
val mMedGreen: Int = medGreen

@JsonIgnore
val mMedBlue: Int = medBlue

constructor() : this("", 0, 0.0, 0.0, 0.0, 0.0f, "", 0, 0, 0, 0, 0, 0.0, 0.0, 0, 0f, 0f, 0f, 0f, 0, 0,0 ,"" ,"" , "", "", "", "", "", "", null, 0.0, 0.0, 0.0,0,0,0) {}
}

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