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perfect images of aztec pass, real world fail

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Henry Schimke
2022-09-29 17:46:23 -05:00
parent 0048f68594
commit 4e88a2ca6c
15 changed files with 843 additions and 494 deletions
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47
src/common/mod.rs
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@@ -3829,37 +3829,38 @@ impl Binarizer for HybridBinarizer {
&& height >= HybridBinarizer::MINIMUM_DIMENSION
{
let luminances = source.getMatrix();
let mut subWidth = width >> HybridBinarizer::BLOCK_SIZE_POWER;
let mut sub_width = width >> HybridBinarizer::BLOCK_SIZE_POWER;
if (width & HybridBinarizer::BLOCK_SIZE_MASK) != 0 {
subWidth += 1;
sub_width += 1;
}
let mut subHeight = height >> HybridBinarizer::BLOCK_SIZE_POWER;
let mut sub_height = height >> HybridBinarizer::BLOCK_SIZE_POWER;
if (height & HybridBinarizer::BLOCK_SIZE_MASK) != 0 {
subHeight += 1;
sub_height += 1;
}
let blackPoints = Self::calculateBlackPoints(
let black_points = Self::calculateBlackPoints(
&luminances,
subWidth as u32,
subHeight as u32,
sub_width as u32,
sub_height as u32,
width as u32,
height as u32,
);
let mut newMatrix = BitMatrix::new(width as u32, height as u32)?;
let mut new_matrix = BitMatrix::new(width as u32, height as u32)?;
Self::calculateThresholdForBlock(
&luminances,
subWidth as u32,
subHeight as u32,
sub_width as u32,
sub_height as u32,
width as u32,
height as u32,
&blackPoints,
&mut newMatrix,
&black_points,
&mut new_matrix,
);
matrix = newMatrix;
matrix = new_matrix;
} else {
// If the image is too small, fall back to the global histogram approach.
matrix = self.ghb.getBlackMatrix()?;
}
// dbg!(matrix.to_string());
Ok(matrix)
}
@@ -3997,16 +3998,16 @@ impl HybridBinarizer {
if xoffset > maxXOffset as u32 {
xoffset = maxXOffset as u32;
}
let mut sum = 0;
let mut min = 0xFF;
let mut max = 0;
let mut sum = 0u32;
let mut min = 0;
let mut max = 0xFF;
let mut offset = yoffset * width + xoffset;
for yy in 0..HybridBinarizer::BLOCK_SIZE {
// for (int yy = 0, offset = yoffset * width + xoffset; yy < HybridBinarizer::BLOCK_SIZE; yy++, offset += width) {
for xx in 0..HybridBinarizer::BLOCK_SIZE {
// for (int xx = 0; xx < HybridBinarizer::BLOCK_SIZE; xx++) {
let pixel = luminances[offset as usize + xx];
sum += pixel;
sum += pixel as u32;
// still looking for good contrast
if pixel < min {
min = pixel;
@@ -4023,7 +4024,7 @@ impl HybridBinarizer {
// for (yy++, offset += width; yy < HybridBinarizer::BLOCK_SIZE; yy++, offset += width) {
for xx in 0..HybridBinarizer::BLOCK_SIZE {
// for (int xx = 0; xx < BLOCK_SIZE; xx++) {
sum += luminances[offset as usize + xx];
sum += luminances[offset as usize + xx] as u32;
}
offset += width;
}
@@ -4041,7 +4042,7 @@ impl HybridBinarizer {
//
// The default assumption is that the block is light/background. Since no estimate for
// the level of dark pixels exists locally, use half the min for the block.
average = min / 2;
average = min as u32 / 2;
if y > 0 && x > 0 {
// Correct the "white background" assumption for blocks that have neighbors by comparing
@@ -4051,16 +4052,16 @@ impl HybridBinarizer {
// the boundaries is used for the interior.
// The (min < bp) is arbitrary but works better than other heuristics that were tried.
let averageNeighborBlackPoint = (blackPoints[y as usize - 1][x as usize]
let average_neighbor_black_point = (blackPoints[y as usize - 1][x as usize]
+ (2 * blackPoints[y as usize][x as usize - 1])
+ blackPoints[y as usize - 1][x as usize - 1])
/ 4;
if (min < averageNeighborBlackPoint) {
average = averageNeighborBlackPoint;
if (min < average_neighbor_black_point) {
average = average_neighbor_black_point as u32;
}
}
}
blackPoints[y as usize][x as usize] = average;
blackPoints[y as usize][x as usize] = average as u8;
}
}
return blackPoints