private static char DistinguishEightFromSimilarChars(uint[] block, IotaVtiOcrProcessor stateManager, bool couldBeNine, bool couldBeSix, bool couldBeThree, bool couldBeEight)
{
int chanceToBeSix = couldBeSix ? GetPercentSimilarities(block, stateManager.SixEightXorPattern, stateManager.SixEightXorPatternFactor) : 0;
int chanceToBeNine = couldBeNine ? GetPercentSimilarities(block, stateManager.NineEightXorPattern, stateManager.NineEightXorPatternFactor) : 0;
int chanceToBeThree = couldBeThree ? GetPercentSimilarities(block, stateManager.ThreeEightXorPattern, stateManager.ThreeEightXorPatternFactor) : 0;
int minRequiredChance = couldBeEight ? 50 : 0;
if (chanceToBeThree > minRequiredChance && chanceToBeThree > chanceToBeSix && chanceToBeThree > chanceToBeNine)
{
return('3');
}
else if (chanceToBeSix > minRequiredChance && chanceToBeSix > chanceToBeNine && chanceToBeSix > chanceToBeThree)
{
return('6');
}
else if (chanceToBeNine > minRequiredChance && chanceToBeNine > chanceToBeSix && chanceToBeNine > chanceToBeThree)
{
return('9');
}
else if (couldBeEight)
{
return('8');
}
return(' ');
}
protected void PlotImage(Graphics graphics, IotaVtiOcrProcessor stateManager, bool isOddField)
{
if (stateManager.BlockOffsetsX != null &&
stateManager.BlockOffsetsX.Length == IotaVtiOcrProcessor.MAX_POSITIONS &&
stateManager.BlockOffsetsX[1] > 0)
{
for (int i = 0; i < IotaVtiOcrProcessor.MAX_POSITIONS; i++)
{
if (stateManager.BlockOffsetsX[i] > 0)
{
graphics.DrawRectangle(
Pens.Chartreuse,
stateManager.BlockOffsetsX[i],
stateManager.BlockOffsetY(isOddField),
stateManager.BlockWidth,
stateManager.BlockHeight);
}
}
}
else
{
graphics.DrawRectangle(
Pens.Chartreuse,
0,
stateManager.BlockOffsetY(isOddField),
m_Width,
stateManager.BlockHeight);
}
}
public int GetLastFrameNoDigitPosition(IotaVtiOcrProcessor stateManager)
{
for (int i = IotaVtiOcrProcessor.FIRST_FRAME_NO_DIGIT_POSITIONS; i <= IotaVtiOcrProcessor.MAX_POSITIONS; i++)
{
uint[] pixels = stateManager.GetBlockAtPosition(Image, i, IsOddField);
int nuberSignalPixels = pixels.Count(x => x < 127);
if (stateManager.IsMatchingSignature(nuberSignalPixels) /* Matches to blank block */)
{
return(i);
}
}
return(-1);
}
internal static IotaVtiTimeStampStrings OcrField(uint[] pixels, IotaVtiOcrProcessor stateManager, bool isOddField)
{
char char1 = OcrBlock(pixels, stateManager, 1, isOddField);
char char3 = OcrBlock(pixels, stateManager, 3, isOddField);
char char4 = OcrBlock(pixels, stateManager, 4, isOddField);
char char6 = OcrBlock(pixels, stateManager, 6, isOddField);
char char7 = OcrBlock(pixels, stateManager, 7, isOddField);
char char9 = OcrBlock(pixels, stateManager, 9, isOddField);
char char10 = OcrBlock(pixels, stateManager, 10, isOddField);
char char12 = OcrBlock(pixels, stateManager, 12, isOddField);
char char13 = OcrBlock(pixels, stateManager, 13, isOddField);
char char14 = OcrBlock(pixels, stateManager, 14, isOddField);
char char15 = OcrBlock(pixels, stateManager, 15, isOddField);
char char17 = OcrBlock(pixels, stateManager, 17, isOddField);
char char18 = OcrBlock(pixels, stateManager, 18, isOddField);
char char19 = OcrBlock(pixels, stateManager, 19, isOddField);
char char20 = OcrBlock(pixels, stateManager, 20, isOddField);
char char22 = OcrBlock(pixels, stateManager, 22, isOddField);
char char23 = OcrBlock(pixels, stateManager, 23, isOddField);
char char24 = OcrBlock(pixels, stateManager, 24, isOddField);
char char25 = OcrBlock(pixels, stateManager, 25, isOddField);
char char26 = OcrBlock(pixels, stateManager, 26, isOddField);
char char27 = OcrBlock(pixels, stateManager, 27, isOddField);
char char28 = OcrBlock(pixels, stateManager, 28, isOddField);
var rv = new IotaVtiTimeStampStrings()
{
NumSat = char1,
HH = string.Format("{0}{1}", char3, char4),
MM = string.Format("{0}{1}", char6, char7),
SS = string.Format("{0}{1}", char9, char10),
FFFF1 = string.Format("{0}{1}{2}{3}", char12, char13, char14, char15),
FFFF2 = string.Format("{0}{1}{2}{3}", char17, char18, char19, char20),
FRAMENO = string.Format("{0}{1}{2}{3}{4}{5}{6}", char22, char23, char24, char25, char26, char27, char28).TrimEnd()
};
if (string.IsNullOrWhiteSpace(rv.FFFF1))
{
rv.FFFF1 = "";
}
if (string.IsNullOrWhiteSpace(rv.FFFF2))
{
rv.FFFF2 = "";
}
return(rv);
}
private int GetLastFrameNoDigitStartPosition(IotaVtiOcrProcessor stateManager)
{
uint[] result = new uint[m_CalibratedPositons[0].Image.Length];
for (int i = 0; i < m_CalibratedPositons.Count - 2; i++)
{
uint[] prev = m_CalibratedPositons[i].Image;
uint[] next = m_CalibratedPositons[i + 1].Image;
for (int j = 0; j < result.Length; j++)
{
int x = j % stateManager.CurrentImageWidth;
if (x > ROUTH_START_FRAME_NUMBER_BLOCKS && prev[j] != next[j])
{
result[j]++;
}
}
}
int bestRating = -1;
int bestStartPosition = -1;
int oneOfEvenOrOddY = stateManager.BlockOffsetY(false);
int TOTAL_PIXELS = result.Length;
for (int x = ROUTH_START_FRAME_NUMBER_BLOCKS; x < stateManager.CurrentImageWidth - stateManager.BlockWidth; x++)
{
int currentRating = 0;
for (int y = 0; y < stateManager.BlockHeight; y++)
{
for (int k = 0; k < stateManager.BlockWidth; k++)
{
int idx = x + k + (oneOfEvenOrOddY + y) * stateManager.CurrentImageWidth;
if (idx < TOTAL_PIXELS && result[idx] > 0)
{
currentRating++;
}
}
}
if (currentRating > bestRating)
{
bestStartPosition = x;
bestRating = currentRating;
}
}
return(bestStartPosition);
}
public override void Process(IotaVtiOcrProcessor stateManager, Graphics graphics, int frameNo, bool isOddField)
{
if (m_Width != stateManager.CurrentImageWidth || m_Height != stateManager.CurrentImageHeight)
{
Reinitialise(stateManager.CurrentImageWidth, stateManager.CurrentImageHeight);
ROUTH_START_FRAME_NUMBER_BLOCKS = (int)Math.Round(IotaVtiOcrProcessor.COEFF_FIRST_FRAME_NO_DIGIT_POSITION * stateManager.CurrentImageWidth);
}
CalibrateBlockPositonsTop(stateManager, isOddField);
CalibrateBlockPositonsWidth(stateManager, isOddField);
if (m_CalibratedPositons.Count == 10)
{
stateManager.BlockOffsetYOdd = m_CalibratedPositons.Where(x => x.IsOddField).MostCommonValue(x => x.BlockOffsetY);
stateManager.BlockOffsetYEven = m_CalibratedPositons.Where(x => !x.IsOddField).MostCommonValue(x => x.BlockOffsetY);
var normalizedPositions = new List <CalibratedBlockPosition>();
bool swapped;
if (CalibrateFrameNumberBlockPositions(stateManager, stateManager.IsTvSafeModeGuess, out normalizedPositions, out swapped) &&
RecognizedTimestampsConsistent(stateManager, normalizedPositions, swapped))
{
stateManager.ChangeState <IotaVtiOcrCalibratedState>();
stateManager.Process(stateManager.CurrentImage, stateManager.CurrentImageWidth, stateManager.CurrentImageHeight, graphics, frameNo, isOddField);
return;
}
else if (CalibrateFrameNumberBlockPositions(stateManager, !stateManager.IsTvSafeModeGuess, out normalizedPositions, out swapped) &&
RecognizedTimestampsConsistent(stateManager, normalizedPositions, swapped))
{
stateManager.ChangeState <IotaVtiOcrCalibratedState>();
stateManager.Process(stateManager.CurrentImage, stateManager.CurrentImageWidth, stateManager.CurrentImageHeight, graphics, frameNo, isOddField);
return;
}
else
{
// Make sure we always remove the whole frame, so swapped fields create less issues when learning the characters
m_CalibratedPositons.RemoveAt(0);
m_CalibratedPositons.RemoveAt(0);
}
}
if (graphics != null)
{
base.PlotImage(graphics, stateManager, isOddField);
}
}
public override void Process(IotaVtiOcrProcessor stateManager, Graphics graphics, int frameNo, bool isOddField)
{
if (m_Width != stateManager.CurrentImageWidth || m_Height != stateManager.CurrentImageHeight)
{
stateManager.ChangeState <IotaVtiOcrCalibratingState>();
return;
}
uint[] pixels = stateManager.CurrentImage;
IotaVtiTimeStampStrings ocredValue = OcrField(pixels, stateManager, isOddField);
stateManager.SetOcredString(ocredValue);
if (graphics != null)
{
base.PlotImage(graphics, stateManager, isOddField);
}
}
private char OcrBlock(IotaVtiOcrProcessor stateManager, uint[] image, int startingPosition, bool isOddField, out int rating)
{
uint[] block = stateManager.GetBlockAtXOffset(image, startingPosition, isOddField);
int[] diffSignatures = new int[10];
int[] diffDigits = new int[10];
diffSignatures[0] = GetDiffSignature(block, stateManager.ZeroDigitPattern);
diffDigits[0] = 0;
diffSignatures[1] = GetDiffSignature(block, stateManager.OneDigitPattern);
diffDigits[1] = 1;
diffSignatures[2] = GetDiffSignature(block, stateManager.TwoDigitPattern);
diffDigits[2] = 2;
diffSignatures[3] = GetDiffSignature(block, stateManager.ThreeDigitPattern);
diffDigits[3] = 3;
diffSignatures[4] = GetDiffSignature(block, stateManager.FourDigitPattern);
diffDigits[4] = 4;
diffSignatures[5] = GetDiffSignature(block, stateManager.FiveDigitPattern);
diffDigits[5] = 5;
diffSignatures[6] = GetDiffSignature(block, stateManager.SixDigitPattern);
diffDigits[6] = 6;
diffSignatures[7] = GetDiffSignature(block, stateManager.SevenDigitPattern);
diffDigits[7] = 7;
diffSignatures[8] = GetDiffSignature(block, stateManager.EightDigitPattern);
diffDigits[8] = 8;
diffSignatures[9] = GetDiffSignature(block, stateManager.NineDigitPattern);
diffDigits[9] = 9;
Array.Sort(diffSignatures, diffDigits);
if (stateManager.IsMatchingSignature(diffSignatures[0]))
{
if (diffDigits[0] == 8 || diffDigits[0] == 6 || diffDigits[0] == 9)
{
// If we matched to a 6, 8 or 9, then do additional check as those three characters are too similar
}
rating = diffSignatures[0];
return(diffDigits[0].ToString()[0]);
}
rating = int.MaxValue;
return(' ');
}
private void SetupSixEightNineThreeDiffs(IotaVtiOcrProcessor stateManager)
{
uint[] eightPattern = stateManager.EightDigitPattern;
int numDifferentPixels;
uint[] xoredPattern;
uint[] sixPattern = stateManager.SixDigitPattern;
xoredPattern = XorPatterns(eightPattern, sixPattern, out numDifferentPixels);
stateManager.SixEightXorPattern = xoredPattern;
stateManager.SixEightXorPatternFactor = numDifferentPixels;
uint[] ninePattern = stateManager.NineDigitPattern;
xoredPattern = XorPatterns(eightPattern, ninePattern, out numDifferentPixels);
stateManager.NineEightXorPattern = xoredPattern;
stateManager.NineEightXorPatternFactor = numDifferentPixels;
uint[] threePattern = stateManager.ThreeDigitPattern;
xoredPattern = XorPatterns(eightPattern, threePattern, out numDifferentPixels);
stateManager.ThreeEightXorPattern = xoredPattern;
stateManager.ThreeEightXorPatternFactor = numDifferentPixels;
}
private bool CalibrateFrameNumberBlockPositions(IotaVtiOcrProcessor stateManager, bool tvSafeMode, out List <CalibratedBlockPosition> normalizedPositions, out bool swapped)
{
try
{
int last = GetLastFrameNoDigitStartPosition(stateManager);
if (last > -1)
{
int secondLast = last - stateManager.BlockWidth;
// We now know the position of the two digits. We can now 'learn' the digits from '0' to '9' finding the change of the second last digit
// and then infering the values from '0' to '9' of the last digit
foreach (CalibratedBlockPosition blockPosition in m_CalibratedPositons)
{
blockPosition.PrepareLastTwoDigitsFromTheFrameNumber(stateManager, last, secondLast);
}
if (DigitPatternsRecognized(stateManager, out normalizedPositions, out swapped))
{
stateManager.LastBlockOffsetsX = last;
stateManager.SecondLastBlockOffsetsX = secondLast;
// Now go and determine the positions of the remaining blocks by matching their value to the 'learned' digits
return(LocateRemainingBlockPositions(stateManager, tvSafeMode));
}
}
}
catch (Exception ex)
{
Trace.WriteLine(ex.GetFullStackTrace());
}
normalizedPositions = new List <CalibratedBlockPosition>();
swapped = false;
return(false);
}
private bool DigitPatternsRecognized(IotaVtiOcrProcessor stateManager, out List <CalibratedBlockPosition> normalizedPositions, out bool swapped)
{
normalizedPositions = new List <CalibratedBlockPosition>();
Trace.Assert(m_CalibratedPositons.Count == 10);
List <int> forwardDiffs = m_CalibratedPositons
.Select(x => GetDiffSignature(x.SecondLastFrameNoDigit, m_CalibratedPositons[0].SecondLastFrameNoDigit))
.ToList();
List <int> backwardDiffs = m_CalibratedPositons
.Select(x => GetDiffSignature(x.SecondLastFrameNoDigit, m_CalibratedPositons[m_CalibratedPositons.Count - 1].SecondLastFrameNoDigit))
.ToList();
BinirizeDiffArray(forwardDiffs);
BinirizeDiffArray(backwardDiffs);
int forwardChangeIndex = forwardDiffs.FindIndex(x => x == 1);
int backwardChangeIndex = backwardDiffs.FindIndex(x => x == 0);
swapped = false;
bool isMatch = forwardChangeIndex == backwardChangeIndex &&
forwardDiffs.FindIndex(forwardChangeIndex, x => x == 0) == -1 &&
backwardDiffs.FindIndex(backwardChangeIndex, x => x == 1) == -1;
if (!isMatch)
{
// Try with swapped fields
for (int i = 0; i < forwardDiffs.Count / 2; i++)
{
int tmp = forwardDiffs[2 * i];
forwardDiffs[2 * i] = forwardDiffs[2 * i + 1];
forwardDiffs[2 * i + 1] = tmp;
tmp = backwardDiffs[2 * i];
backwardDiffs[2 * i] = backwardDiffs[2 * i + 1];
backwardDiffs[2 * i + 1] = tmp;
}
forwardChangeIndex = forwardDiffs.FindIndex(x => x == 1);
backwardChangeIndex = backwardDiffs.FindIndex(x => x == 0);
isMatch = forwardChangeIndex == backwardChangeIndex &&
forwardDiffs.FindIndex(forwardChangeIndex, x => x == 0) == -1 &&
backwardDiffs.FindIndex(backwardChangeIndex, x => x == 1) == -1;
swapped = true;
}
if (isMatch)
{
if (swapped)
{
for (int i = 0; i < m_CalibratedPositons.Count / 2; i++)
{
normalizedPositions.Add(m_CalibratedPositons[2 * i + 1]);
normalizedPositions.Add(m_CalibratedPositons[2 * i]);
}
}
else
{
normalizedPositions.AddRange(m_CalibratedPositons);
}
int indexPixelPrev = forwardChangeIndex > 0 ? forwardChangeIndex - 1 : 9;
int indexPixelNext = forwardChangeIndex < normalizedPositions.Count - 1 ? forwardChangeIndex + 1 : forwardChangeIndex - 9;
int signalChange = normalizedPositions[forwardChangeIndex].LastFrameNoDigit.Count(x => x < 127);
int signalPixelsPrev = normalizedPositions[indexPixelPrev].LastFrameNoDigit.Count(x => x < 127);
int signalPixelsNext = normalizedPositions[indexPixelNext].LastFrameNoDigit.Count(x => x < 127);
// OneAfterZero: 9 - 0 - 1
// ZeroAfterOne: 8 - 1 - 0
if (signalChange < signalPixelsPrev && signalChange < signalPixelsNext)
{
// One before Zero
stateManager.LearnDigitPattern(normalizedPositions[indexPixelNext].LastFrameNoDigit, 0);
stateManager.LearnDigitPattern(normalizedPositions[forwardChangeIndex].LastFrameNoDigit, 1);
stateManager.LearnDigitPattern(normalizedPositions[indexPixelPrev].LastFrameNoDigit, 8);
// 3 - 2 - 5 - 4 - 7 - 6 - 9 - (8 - 1 - 0) - 3 - 2 - 5 - 4 - 7 - 6 - 9 - 8
int walkBackIndex = indexPixelPrev - 1;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 9);
}
walkBackIndex--;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 6);
}
walkBackIndex--;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 7);
}
walkBackIndex--;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 4);
}
walkBackIndex--;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 5);
}
walkBackIndex--;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 2);
}
walkBackIndex--;
if (walkBackIndex >= 0)
{
stateManager.LearnDigitPattern(normalizedPositions[walkBackIndex].LastFrameNoDigit, 3);
}
int walkForwardIndex = indexPixelNext + 1;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 3);
}
walkForwardIndex++;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 2);
}
walkForwardIndex++;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 5);
}
walkForwardIndex++;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 4);
}
walkForwardIndex++;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 7);
}
walkForwardIndex++;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 6);
}
walkForwardIndex++;
if (walkForwardIndex < 10)
{
stateManager.LearnDigitPattern(normalizedPositions[walkForwardIndex].LastFrameNoDigit, 9);
}
stateManager.SwapFieldsOrder = true;
SetupSixEightNineThreeDiffs(stateManager);
return(true);
}
else if (signalPixelsNext < signalChange && signalPixelsNext < signalPixelsPrev)
{
stateManager.LearnDigitPattern(normalizedPositions[forwardChangeIndex].LastFrameNoDigit, 0);
// One after Zero
int nextDigitIndex = indexPixelNext;
for (int i = 0; i < 9; i++)
{
stateManager.LearnDigitPattern(normalizedPositions[nextDigitIndex].LastFrameNoDigit, 1 + i);
nextDigitIndex++;
if (nextDigitIndex > 9)
{
nextDigitIndex -= 10;
}
}
stateManager.SwapFieldsOrder = false;
SetupSixEightNineThreeDiffs(stateManager);
return(true);
}
else
{
return(false);
}
}
return(false);
}
public override void FinaliseState(IotaVtiOcrProcessor stateManager)
{
}
public override void InitialiseState(IotaVtiOcrProcessor stateManager)
{
m_Width = stateManager.CurrentImageWidth;
m_Height = stateManager.CurrentImageHeight;
}
private static char OcrBlock(uint[] fieldPixels, IotaVtiOcrProcessor stateManager, int blockIndex, bool isOddField)
{
uint[] block = stateManager.GetBlockAtPosition(fieldPixels, blockIndex, isOddField);
s_DiffSignatures[0] = GetDiffSignature(block, stateManager.ZeroDigitPattern);
s_DiffDigits[0] = 0;
s_DiffSignatures[1] = GetDiffSignature(block, stateManager.OneDigitPattern);
s_DiffDigits[1] = 1;
s_DiffSignatures[2] = GetDiffSignature(block, stateManager.TwoDigitPattern);
s_DiffDigits[2] = 2;
s_DiffSignatures[3] = GetDiffSignature(block, stateManager.ThreeDigitPattern);
s_DiffDigits[3] = 3;
s_DiffSignatures[4] = GetDiffSignature(block, stateManager.FourDigitPattern);
s_DiffDigits[4] = 4;
s_DiffSignatures[5] = GetDiffSignature(block, stateManager.FiveDigitPattern);
s_DiffDigits[5] = 5;
s_DiffSignatures[6] = GetDiffSignature(block, stateManager.SixDigitPattern);
s_DiffDigits[6] = 6;
s_DiffSignatures[7] = GetDiffSignature(block, stateManager.SevenDigitPattern);
s_DiffDigits[7] = 7;
s_DiffSignatures[8] = GetDiffSignature(block, stateManager.EightDigitPattern);
s_DiffDigits[8] = 8;
s_DiffSignatures[9] = GetDiffSignature(block, stateManager.NineDigitPattern);
s_DiffDigits[9] = 9;
double maxStrictMatch = stateManager.BlockWidth * stateManager.BlockHeight / 12.0;
double maxMatch = stateManager.BlockWidth * stateManager.BlockHeight / 8.0;
int strictMatchesIdx = 0;
int matchesIdx = 0;
for (int i = 0; i < 10; i++)
{
if (s_DiffSignatures[i] < maxStrictMatch && strictMatchesIdx < MAX_MATCHES)
{
s_StrictMatches[strictMatchesIdx] = s_DiffDigits[i];
strictMatchesIdx++;
}
if (s_DiffSignatures[i] < maxMatch && matchesIdx < MAX_MATCHES)
{
s_Matches[matchesIdx] = s_DiffDigits[i];
matchesIdx++;
}
}
if (strictMatchesIdx == 1)
{
return(s_StrictMatches[0].ToString()[0]);
}
else if (strictMatchesIdx == 0 && matchesIdx == 1)
{
return(s_Matches[0].ToString()[0]);
}
else if (strictMatchesIdx > 1 || matchesIdx > 1)
{
var allMatches = new List <int>();
if (strictMatchesIdx > 1)
{
for (int i = 0; i < strictMatchesIdx; i++)
{
allMatches.Add(s_StrictMatches[i]);
}
}
else if (matchesIdx > 1)
{
for (int i = 0; i < matchesIdx; i++)
{
allMatches.Add(s_Matches[i]);
}
}
bool areAll8693Items = !allMatches.Any(x => x != 3 && x != 6 && x != 9 && x != 8);
if (areAll8693Items)
{
bool is8Present = allMatches.Contains(8);
bool is9Present = allMatches.Contains(9);
bool is6Present = allMatches.Contains(6);
bool is3Present = allMatches.Contains(3);
return(DistinguishEightFromSimilarChars(block, stateManager, is9Present, is6Present, is3Present, is8Present));
}
}
return(' ');
}
private bool RecognizedTimestampsConsistent(IotaVtiOcrProcessor stateManager, List <CalibratedBlockPosition> normalizedPositions, bool swapped)
{
var allTimeStamps = new List <IotaVtiTimeStamp>();
int index = 0;
int totalTimestamps = normalizedPositions.Count;
for (; ;)
{
if (index == totalTimestamps - 1)
{
break;
}
IotaVtiTimeStampStrings timeStampStrings = IotaVtiOcrCalibratedState.OcrField(normalizedPositions[index].Image, stateManager, normalizedPositions[index].IsOddField);
if (!timeStampStrings.AllCharsPresent())
{
return(false);
}
var timeStamp = new IotaVtiTimeStamp(timeStampStrings);
if (stateManager.SwapFieldsOrder)
{
if (index + 1 == totalTimestamps - 1)
{
break;
}
IotaVtiTimeStampStrings timeStampStrings2 = IotaVtiOcrCalibratedState.OcrField(normalizedPositions[index + 1].Image, stateManager, normalizedPositions[index + 1].IsOddField);
if (!timeStampStrings2.AllCharsPresent())
{
return(false);
}
var timeStamp2 = new IotaVtiTimeStamp(timeStampStrings2);
allTimeStamps.Add(timeStamp2);
index++;
}
allTimeStamps.Add(timeStamp);
index++;
}
float fieldDurationMS = 0;
for (int i = 0; i < allTimeStamps.Count - 1; i++)
{
if (allTimeStamps[i].FrameNumber != allTimeStamps[i + 1].FrameNumber - 1 &&
allTimeStamps[i].FrameNumber != allTimeStamps[i + 1].FrameNumber + 1)
{
return(false);
}
int totalMillisecondsThis = (allTimeStamps[i].Hours * 3600 + allTimeStamps[i].Minutes * 60 + allTimeStamps[i].Seconds) * 10000 + allTimeStamps[i].Milliseconds10;
int totalMillisecondsNext = (allTimeStamps[i + 1].Hours * 3600 + allTimeStamps[i + 1].Minutes * 60 + allTimeStamps[i + 1].Seconds) * 10000 + allTimeStamps[i + 1].Milliseconds10;
fieldDurationMS = (totalMillisecondsNext - totalMillisecondsThis) / 10f;
if (Math.Abs(Math.Abs(fieldDurationMS) - VtiTimeStampComposer.FIELD_DURATION_PAL) > 0.15 && Math.Abs(Math.Abs(fieldDurationMS) - VtiTimeStampComposer.FIELD_DURATION_NTSC) > 0.15)
{
return(false);
}
}
if (Math.Abs(Math.Abs(fieldDurationMS) - VtiTimeStampComposer.FIELD_DURATION_PAL) < 0.15)
{
stateManager.VideoFormat = VideoFormat.PAL;
}
else if (Math.Abs(Math.Abs(fieldDurationMS) - VtiTimeStampComposer.FIELD_DURATION_NTSC) < 0.15)
{
stateManager.VideoFormat = VideoFormat.NTSC;
}
else
{
stateManager.VideoFormat = null;
}
stateManager.EvenBeforeOdd = swapped;
return(true);
}
public override void InitialiseState(IotaVtiOcrProcessor stateManager)
{
m_Width = 0;
m_Height = 0;
}
public abstract void Process(IotaVtiOcrProcessor stateManager, Graphics g, int frameNo, bool isOddField);
public void PrepareLastTwoDigitsFromTheFrameNumber(IotaVtiOcrProcessor stateManager)
{
LastFrameNoDigit = stateManager.GetBlockAtPosition(Image, stateManager.LastFrameNoDigitPosition, IsOddField);
SecondLastFrameNoDigit = stateManager.GetBlockAtPosition(Image, stateManager.LastFrameNoDigitPosition - 1, IsOddField);
}
private bool LocateRemainingBlockPositions(IotaVtiOcrProcessor stateManager, bool tvSafeMode)
{
var confirmedBlockPositions = new List <int>();
foreach (CalibratedBlockPosition blockPosition in m_CalibratedPositons)
{
int prevMatchLocation = -1;
int pendingLocation = -1;
int pendingRating = int.MaxValue;
for (int i = 0; i < stateManager.LastBlockOffsetsX; i++)
{
// Try to match each learned digit to every position
int rating = 0;
char ch = OcrBlock(stateManager, blockPosition.Image, i, blockPosition.IsOddField, out rating);
if (ch != ' ')
{
if (prevMatchLocation == -1 ||
i == prevMatchLocation + 1)
{
// Sequential matches
if (pendingRating > rating)
{
pendingRating = rating;
pendingLocation = i;
}
prevMatchLocation = i;
}
//Trace.WriteLine(string.Format("IOTA-VTI OCR: Recognized '{0}' at position {1} with score {2}.", ch, i, rating));
}
else
{
if (pendingLocation > 0)
{
// Save the location
confirmedBlockPositions.Add(pendingLocation);
}
prevMatchLocation = -1;
pendingLocation = -1;
pendingRating = int.MaxValue;
}
}
}
List <int> distinctPositions = confirmedBlockPositions.Distinct().ToList();
distinctPositions.Sort();
int posIdx = 0;
stateManager.BlockOffsetsX = new int[IotaVtiOcrProcessor.MAX_POSITIONS];
for (int i = 0; i < IotaVtiOcrProcessor.MAX_POSITIONS; i++)
{
stateManager.BlockOffsetsX[i] = -1;
}
int[] CHAR_INDEXES = tvSafeMode
? new int[] { 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28 }
: new int[] { 1, 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28 };
if (!tvSafeMode)
{
// In Non TV-Safe mode, make sure we are not trying to recognize the GPS Fix character, where 'P' can be mistaken for an '8'
// to also allow for the GPS character to be slightly off screen we remove all chars that are with offset less than half a block
distinctPositions.RemoveAll(x => x < 0.5 * stateManager.BlockWidth);
}
while (distinctPositions.Count > 0)
{
int nextPos = distinctPositions[0];
if (distinctPositions.Count > 1 && distinctPositions[1] == nextPos + 1)
{
int occurances0 = confirmedBlockPositions.Count(x => x == distinctPositions[0]);
int occurances1 = confirmedBlockPositions.Count(x => x == distinctPositions[1]);
if (occurances1 > occurances0)
{
nextPos = distinctPositions[1];
}
distinctPositions.RemoveAt(0);
}
stateManager.BlockOffsetsX[CHAR_INDEXES[posIdx]] = nextPos;
posIdx++;
distinctPositions.RemoveAt(0);
}
stateManager.BlockOffsetsX[CHAR_INDEXES[posIdx]] = stateManager.LastBlockOffsetsX;
for (int k = CHAR_INDEXES[posIdx] + 1; k <= 28; k++)
{
stateManager.BlockOffsetsX[k] = stateManager.BlockOffsetsX[k - 1] + (stateManager.BlockOffsetsX[k - 2] - stateManager.BlockOffsetsX[k - 3]);
}
return(true);
}
public abstract void FinaliseState(IotaVtiOcrProcessor stateManager);
public void PrepareLastTwoDigitsFromTheFrameNumber(IotaVtiOcrProcessor stateManager, int lastBlockX, int secondLastBlockX)
{
LastFrameNoDigit = stateManager.GetBlockAtXOffset(Image, lastBlockX, IsOddField);
SecondLastFrameNoDigit = stateManager.GetBlockAtXOffset(Image, secondLastBlockX, IsOddField);
}
private void CalibrateBlockPositonsTop(IotaVtiOcrProcessor stateManager, bool isOddField)
{
int count = 0;
int maxRating = -1;
int bestYOffs = -1;
int bestHeight = -1;
int imageHeight = stateManager.CurrentImageHeight;
int imageWidth = stateManager.CurrentImageWidth;
for (int top = 0; top < 20; top++)
{
for (int y = m_MinBlockHeight; y <= m_MaxBlockHeight; y++)
{
int totalRating = 0;
int bottom = top + y;
bool bottomOk = (bottom - 1) < imageHeight;
bool bottom2Ok = bottom < imageHeight;
bool bottom3Ok = (bottom + 1) < imageHeight;
for (int x = 0; x < stateManager.CurrentImageWidth; x++)
{
if (x >= stateManager.CurrentImageWidth || x < 0)
{
continue;
}
if (top < 0)
{
continue;
}
if (bottom - 1 >= stateManager.CurrentImageHeight)
{
continue;
}
if (bottomOk && stateManager.CurrentImage[x + imageWidth * (bottom - 1)] < 127 &&
((bottom2Ok && stateManager.CurrentImage[x + imageWidth * bottom] > 127) || bottom == imageHeight) &&
((bottom3Ok && stateManager.CurrentImage[x + imageWidth * (bottom + 1)] > 127) || bottom >= imageHeight - 1))
{
totalRating++;
}
if (stateManager.CurrentImage[x + imageWidth * (top + 1)] < 127 &&
stateManager.CurrentImage[x + imageWidth * top] > 127 &&
(top == 0 || stateManager.CurrentImage[x + imageWidth * (top - 1)] > 127))
{
totalRating++;
}
}
if (totalRating > maxRating)
{
maxRating = totalRating;
bestYOffs = top;
bestHeight = y;
}
count++;
}
}
stateManager.BlockHeight = bestHeight;
if (isOddField)
{
stateManager.BlockOffsetYOdd = bestYOffs;
}
else
{
stateManager.BlockOffsetYEven = bestYOffs;
}
}
private void CalibrateBlockPositonsWidth(IotaVtiOcrProcessor stateManager, bool isOddField)
{
int maxRating = -1;
int bestWidth = -1;
var bestStartingPositions = new List <int>();
// Determined previously
int bestHeight = stateManager.BlockHeight;
int bestYOffs = stateManager.BlockOffsetY(isOddField);
int imageWidth = stateManager.CurrentImageWidth;
var startingPositions = new List <int>();
for (int width = m_MinBlockWidth; width <= m_MaxBlockWidth; width++)
{
int totalRating = 0;
startingPositions.Clear();
for (int x = 1; x < stateManager.CurrentImageWidth - width - 1; x++)
{
bool prevTwoVerticalsAreWhite = true;
for (int y = bestYOffs; y < bestYOffs + bestHeight + 1; y++)
{
if (y >= stateManager.CurrentImageHeight)
{
continue;
}
if (stateManager.CurrentImage[x - 1 + imageWidth * y] < 127 || stateManager.CurrentImage[x + imageWidth * y] < 127)
{
prevTwoVerticalsAreWhite = false;
break;
}
}
if (!prevTwoVerticalsAreWhite)
{
continue;
}
for (int y = bestYOffs; y < bestYOffs + bestHeight + 1; y++)
{
if (y >= stateManager.CurrentImageHeight)
{
continue;
}
if (stateManager.CurrentImage[x + 1 + imageWidth * y] < 127)
{
totalRating++;
if (stateManager.CurrentImage[x + width - 1 + imageWidth * y] < 127 &&
stateManager.CurrentImage[x + width + imageWidth * y] > 127 &&
stateManager.CurrentImage[x + width + 1 + imageWidth * y] > 127)
{
startingPositions.Add(x);
totalRating++;
}
}
}
}
if (totalRating > maxRating)
{
// Collect stats about the starting positions ??
maxRating = totalRating;
bestWidth = width;
bestStartingPositions.Clear();
bestStartingPositions.AddRange(startingPositions);
}
}
stateManager.BlockWidth = bestWidth;
var calibrationBlock = new CalibratedBlockPosition(stateManager.CurrentImage)
{
BlockWidth = bestWidth,
BlockHeight = bestHeight,
BlockOffsetY = bestYOffs,
BestStartingPositions = bestStartingPositions.ToArray(),
IsOddField = isOddField
};
m_CalibratedPositons.Add(calibrationBlock);
}