// Score a collection of lines as a possible license plate region.
// If any segments are missing, extrapolate the missing pieces
void PlateCorners::scoreHorizontals(int h1, int h2)
{
//if (this->debug)
// cout << "PlateCorners::scorePlate" << endl;
float score = 0; // Lower is better
LineSegment top;
LineSegment bottom;
float charHeightToPlateHeightRatio = config->plateHeightMM / config->charHeightMM;
float idealPixelHeight = this->charHeight * charHeightToPlateHeightRatio;
if (h1 == NO_LINE && h2 == NO_LINE)
{
// return;
Point centerLeft = charRegion->getCharBoxLeft().midpoint();
Point centerRight = charRegion->getCharBoxRight().midpoint();
LineSegment centerLine = LineSegment(centerLeft.x, centerLeft.y, centerRight.x, centerRight.y);
top = centerLine.getParallelLine(idealPixelHeight / 2);
bottom = centerLine.getParallelLine(-1 * idealPixelHeight / 2 );
score += SCORING_MISSING_SEGMENT_PENALTY_HORIZONTAL * 2;
}
else if (h1 != NO_LINE && h2 != NO_LINE)
{
top = this->plateLines->horizontalLines[h1];
bottom = this->plateLines->horizontalLines[h2];
}
else if (h1 == NO_LINE && h2 != NO_LINE)
{
bottom = this->plateLines->horizontalLines[h2];
top = bottom.getParallelLine(idealPixelHeight);
score += SCORING_MISSING_SEGMENT_PENALTY_HORIZONTAL;
}
else if (h1 != NO_LINE && h2 == NO_LINE)
{
top = this->plateLines->horizontalLines[h1];
bottom = top.getParallelLine(-1 * idealPixelHeight);
score += SCORING_MISSING_SEGMENT_PENALTY_HORIZONTAL;
}
// Make sure this line is above our license plate letters
if (top.isPointBelowLine(charRegion->getCharBoxTop().midpoint()) == false)
return;
// Make sure this line is below our license plate letters
if (bottom.isPointBelowLine(charRegion->getCharBoxBottom().midpoint()))
return;
// We now have 4 possible lines. Let's put them to the test and score them...
/////////////////////////////////////////////////////////////////////////
// Score "Boxiness" of the 4 lines. How close is it to a parallelogram?
/////////////////////////////////////////////////////////////////////////
float horizontalAngleDiff = abs(top.angle - bottom.angle);
score += (horizontalAngleDiff) * SCORING_BOXINESS_WEIGHT;
// if (this->debug)
// cout << "PlateCorners boxiness score: " << (horizontalAngleDiff + verticalAngleDiff) * SCORING_BOXINESS_WEIGHT << endl;
//////////////////////////////////////////////////////////////////////////
// SCORE the shape wrt character position and height relative to position
//////////////////////////////////////////////////////////////////////////
Point topPoint = top.midpoint();
Point botPoint = bottom.closestPointOnSegmentTo(topPoint);
float plateHeightPx = distanceBetweenPoints(topPoint, botPoint);
// Get the height difference
float heightRatio = charHeight / plateHeightPx;
float idealHeightRatio = (config->charHeightMM / config->plateHeightMM);
//if (leftRatio < MIN_CHAR_HEIGHT_RATIO || leftRatio > MAX_CHAR_HEIGHT_RATIO || rightRatio < MIN_CHAR_HEIGHT_RATIO || rightRatio > MAX_CHAR_HEIGHT_RATIO)
float heightRatioDiff = abs(heightRatio - idealHeightRatio);
// Ideal ratio == ~.45
// Get the distance from the top and the distance from the bottom
// Take the average distances from the corners of the character region to the top/bottom lines
// float topDistance = distanceBetweenPoints(topMidLinePoint, charRegion->getCharBoxTop().midpoint());
// float bottomDistance = distanceBetweenPoints(bottomMidLinePoint, charRegion->getCharBoxBottom().midpoint());
// float idealTopDistance = charHeight * (TOP_WHITESPACE_HEIGHT_MM / CHARACTER_HEIGHT_MM);
// float idealBottomDistance = charHeight * (BOTTOM_WHITESPACE_HEIGHT_MM / CHARACTER_HEIGHT_MM);
// float distScore = abs(topDistance - idealTopDistance) + abs(bottomDistance - idealBottomDistance);
score += heightRatioDiff * SCORING_PLATEHEIGHT_WEIGHT;
//////////////////////////////////////////////////////////////////////////
// SCORE the middliness of the stuff. We want our top and bottom line to have the characters right towards the middle
//////////////////////////////////////////////////////////////////////////
Point charAreaMidPoint = charRegion->getCharBoxLeft().midpoint();
Point topLineSpot = top.closestPointOnSegmentTo(charAreaMidPoint);
Point botLineSpot = bottom.closestPointOnSegmentTo(charAreaMidPoint);
float topDistanceFromMiddle = distanceBetweenPoints(topLineSpot, charAreaMidPoint);
float bottomDistanceFromMiddle = distanceBetweenPoints(topLineSpot, charAreaMidPoint);
float idealDistanceFromMiddle = idealPixelHeight / 2;
float middleScore = abs(topDistanceFromMiddle - idealDistanceFromMiddle) + abs(bottomDistanceFromMiddle - idealDistanceFromMiddle);
score += middleScore * SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT;
// if (this->debug)
// {
// cout << "PlateCorners boxiness score: " << avgRatio * SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT << endl;
// cout << "PlateCorners boxiness score: " << distScore * SCORING_PLATEHEIGHT_WEIGHT << endl;
// }
//////////////////////////////////////////////////////////////
// SCORE: the shape for angles matching the character region
//////////////////////////////////////////////////////////////
float charanglediff = abs(charAngle - top.angle) + abs(charAngle - bottom.angle);
score += charanglediff * SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT;
// if (this->debug)
// cout << "PlateCorners boxiness score: " << charanglediff * SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT << endl;
if (score < this->bestHorizontalScore)
{
float scorecomponent;
if (this->config->debugPlateCorners)
{
cout << "xx xx Score: charHeight " << this->charHeight << endl;
cout << "xx xx Score: idealHeight " << idealPixelHeight << endl;
cout << "xx xx Score: h1,h2= " << h1 << "," << h2 << endl;
cout << "xx xx Score: Top= " << top.str() << endl;
cout << "xx xx Score: Bottom= " << bottom.str() << endl;
cout << "Horizontal breakdown Score:" << endl;
cout << " -- Boxiness Score: " << horizontalAngleDiff << " -- Weight (" << SCORING_BOXINESS_WEIGHT << ")" << endl;
scorecomponent = horizontalAngleDiff * SCORING_BOXINESS_WEIGHT;
cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Height Ratio Diff Score: " << heightRatioDiff << " -- Weight (" << SCORING_PLATEHEIGHT_WEIGHT << ")" << endl;
scorecomponent = heightRatioDiff * SCORING_PLATEHEIGHT_WEIGHT;
cout << " -- -- " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Distance Score: " << middleScore << " -- Weight (" << SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT << ")" << endl;
scorecomponent = middleScore * SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT;
cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Char angle Score: " << charanglediff << " -- Weight (" << SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT << ")" << endl;
scorecomponent = charanglediff * SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT;
cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Score: " << score << endl;
}
this->bestHorizontalScore = score;
bestTop = LineSegment(top.p1.x, top.p1.y, top.p2.x, top.p2.y);
bestBottom = LineSegment(bottom.p1.x, bottom.p1.y, bottom.p2.x, bottom.p2.y);
}
}
void PlateCorners::scoreVerticals(int v1, int v2)
{
float score = 0; // Lower is better
LineSegment left;
LineSegment right;
float charHeightToPlateWidthRatio = config->plateWidthMM / config->charHeightMM;
float idealPixelWidth = this->charHeight * (charHeightToPlateWidthRatio * 1.03); // Add 3% so we don't clip any characters
if (v1 == NO_LINE && v2 == NO_LINE)
{
//return;
Point centerTop = charRegion->getCharBoxTop().midpoint();
Point centerBottom = charRegion->getCharBoxBottom().midpoint();
LineSegment centerLine = LineSegment(centerBottom.x, centerBottom.y, centerTop.x, centerTop.y);
left = centerLine.getParallelLine(idealPixelWidth / 2);
right = centerLine.getParallelLine(-1 * idealPixelWidth / 2 );
score += SCORING_MISSING_SEGMENT_PENALTY_VERTICAL * 2;
}
else if (v1 != NO_LINE && v2 != NO_LINE)
{
left = this->plateLines->verticalLines[v1];
right = this->plateLines->verticalLines[v2];
}
else if (v1 == NO_LINE && v2 != NO_LINE)
{
right = this->plateLines->verticalLines[v2];
left = right.getParallelLine(idealPixelWidth);
score += SCORING_MISSING_SEGMENT_PENALTY_VERTICAL;
}
else if (v1 != NO_LINE && v2 == NO_LINE)
{
left = this->plateLines->verticalLines[v1];
right = left.getParallelLine(-1 * idealPixelWidth);
score += SCORING_MISSING_SEGMENT_PENALTY_VERTICAL;
}
// Make sure this line is to the left of our license plate letters
if (left.isPointBelowLine(charRegion->getCharBoxLeft().midpoint()) == false)
return;
// Make sure this line is to the right of our license plate letters
if (right.isPointBelowLine(charRegion->getCharBoxRight().midpoint()))
return;
/////////////////////////////////////////////////////////////////////////
// Score "Distance from the edge...
/////////////////////////////////////////////////////////////////////////
float leftDistanceFromEdge = abs((float) (left.p1.x + left.p2.x) / 2);
float rightDistanceFromEdge = abs(this->inputImage.cols - ((float) (right.p1.x + right.p2.x) / 2));
float distanceFromEdge = leftDistanceFromEdge + rightDistanceFromEdge;
score += distanceFromEdge * SCORING_VERTICALDISTANCE_FROMEDGE_WEIGHT;
/////////////////////////////////////////////////////////////////////////
// Score "Boxiness" of the 4 lines. How close is it to a parallelogram?
/////////////////////////////////////////////////////////////////////////
float verticalAngleDiff = abs(left.angle - right.angle);
score += (verticalAngleDiff) * SCORING_BOXINESS_WEIGHT;
//////////////////////////////////////////////////////////////////////////
// SCORE the shape wrt character position and height relative to position
//////////////////////////////////////////////////////////////////////////
Point leftMidLinePoint = left.closestPointOnSegmentTo(charRegion->getCharBoxLeft().midpoint());
Point rightMidLinePoint = right.closestPointOnSegmentTo(charRegion->getCharBoxRight().midpoint());
float plateDistance = abs(idealPixelWidth - distanceBetweenPoints(leftMidLinePoint, rightMidLinePoint));
score += plateDistance * SCORING_VERTICALDISTANCE_WEIGHT;
if (score < this->bestVerticalScore)
{
float scorecomponent;
if (this->config->debugPlateCorners)
{
cout << "xx xx Score: charHeight " << this->charHeight << endl;
cout << "xx xx Score: idealwidth " << idealPixelWidth << endl;
cout << "xx xx Score: v1,v2= " << v1 << "," << v2 << endl;
cout << "xx xx Score: Left= " << left.str() << endl;
cout << "xx xx Score: Right= " << right.str() << endl;
cout << "Vertical breakdown Score:" << endl;
cout << " -- Boxiness Score: " << verticalAngleDiff << " -- Weight (" << SCORING_BOXINESS_WEIGHT << ")" << endl;
scorecomponent = verticalAngleDiff * SCORING_BOXINESS_WEIGHT;
cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Distance From Edge Score: " << distanceFromEdge << " -- Weight (" << SCORING_VERTICALDISTANCE_FROMEDGE_WEIGHT << ")" << endl;
scorecomponent = distanceFromEdge * SCORING_VERTICALDISTANCE_FROMEDGE_WEIGHT;
cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Distance Score: " << plateDistance << " -- Weight (" << SCORING_VERTICALDISTANCE_WEIGHT << ")" << endl;
scorecomponent = plateDistance * SCORING_VERTICALDISTANCE_WEIGHT;
cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
cout << " -- Score: " << score << endl;
}
this->bestVerticalScore = score;
bestLeft = LineSegment(left.p1.x, left.p1.y, left.p2.x, left.p2.y);
bestRight = LineSegment(right.p1.x, right.p1.y, right.p2.x, right.p2.y);
}
}