improve contrast norm and sharpness measurement

This commit is contained in:
Brent Schroeter 2025-12-20 08:58:49 +00:00
parent 3da76d4537
commit d48b672e1b
6 changed files with 133 additions and 340 deletions

View file

@ -40,7 +40,7 @@ def main():
t_start = time()
minimal_docs = (
[doc for doc in item.docs if doc.name != ""]
[doc for doc in item.docs if doc.name != doc.identifier]
if len(item.docs) > 1
else item.docs
)

View file

@ -1,7 +1,7 @@
from sys import stdout
import numpy as np
from PIL import Image, ImageFilter
from PIL import Image, ImageChops, ImageFilter
from .items import ArchiveDoc, ArchiveLeaf
from .ocr import OcrEngine, TextBlock
@ -30,139 +30,100 @@ def analyze_doc(
analyzed_pages = []
for leaf in all_leaves:
im_cropped = leaf.image.crop(
im, is_blank = normalize_contrast_for_text(leaf.image)
im_cropped = im.crop(
(
leaf.image.size[0] * 0.1,
leaf.image.size[1] * 0.1,
leaf.image.size[0] * 0.9,
leaf.image.size[1] * 0.9,
im.size[0] * 0.1,
im.size[1] * 0.1,
im.size[0] * 0.9,
im.size[1] * 0.9,
)
)
sharpness = analyze_sharpness(im_cropped)
is_blank = im_cropped.getextrema()[0] > 255 * 0.8
if is_blank:
max_sharpness = 1
text_margin_px = -1
# OCR is computationally expensive, so we try to take advantage of
# the Tesseract data already parsed by the Internet Archive and
# embedded in the PDF, when possible. If there is not sufficient
# text in the PDF to be confident that the Archive's OCR
# postprocessing captured it all, then OCR is recomputed locally.
#
# In some instances, the Archive's OCR detects rotated text but
# parses it as gibberish. To partially mitigate this, we ignore all
# precomputed text blocks with a "portrait" aspect ratio. This will
# not necessarily help with text that is rotated 180 degrees, but in
# practice that case is rarely encountered. This will also not work
# well with non-latin scripts that are intended to be oriented
# vertically.
OCR_RECOMPUTE_THRESHOLD_WORDS = 30
if (
sum(
(
len(block.text.split())
for block in leaf.text_blocks
if block.x1 - block.x0 > block.y1 - block.y0
)
)
>= OCR_RECOMPUTE_THRESHOLD_WORDS
):
ocred_leaf = leaf
page_angle = 0
else:
# Sharpness is determined by percentile of pixels that match some
# criteria, so it may vary significantly depending on which portion
# of the image is analyzed. In an effort to identify the sharpest
# edges, we split up the image into chunks and assume that the
# highest sharpness value obtained across all chunks is
# representative of the image as a whole.
max_sharpness = 0.0
if im_cropped.size[0] < im_cropped.size[1]:
# Page is in portrait orientation.
segments_x = 2
segments_y = 3
else:
# Page is in landscape orientation.
segments_x = 3
segments_y = 2
for i in range(segments_x):
for j in range(segments_y):
max_sharpness = max(
max_sharpness,
analyze_sharpness(
im_cropped.crop(
(
im_cropped.size[0] / segments_x * i,
im_cropped.size[1] / segments_y * j,
im_cropped.size[0] / segments_x * (i + 1),
im_cropped.size[1] / segments_y * (j + 1),
)
)
),
OCR_SCALE = 1
im_scaled = im.resize(np.int_(np.array(im.size) * OCR_SCALE))
ocr_result = ocr_engine.process(im_scaled)
ocred_leaf = ArchiveLeaf(
image=im,
page_number=leaf.page_number,
text_blocks=[
TextBlock(
x0=int(block.x0 / OCR_SCALE),
y0=int(block.y0 / OCR_SCALE),
x1=int(block.x1 / OCR_SCALE),
y1=int(block.y1 / OCR_SCALE),
text=block.text,
)
for block in ocr_result.blocks
],
)
page_angle = ocr_result.page_angle
# OCR is computationally expensive, so we try to take advantage of
# the Tesseract data already parsed by the Internet Archive and
# embedded in the PDF, when possible. If there is not sufficient
# text in the PDF to be confident that the Archive's OCR
# postprocessing captured it all, then OCR is recomputed locally.
#
# In some instances, the Archive's OCR detects rotated text but
# parses it as gibberish. To partially mitigate this, we ignore all
# precomputed text blocks with a "portrait" aspect ratio. This will
# not necessarily help with text that is rotated 180 degrees, but in
# practice that case is rarely encountered. This will also not work
# well with non-latin scripts that are intended to be oriented
# vertically.
OCR_RECOMPUTE_THRESHOLD_WORDS = 30
if (
sum(
(
len(block.text.split())
for block in leaf.text_blocks
if block.x1 - block.x0 > block.y1 - block.y0
)
)
>= OCR_RECOMPUTE_THRESHOLD_WORDS
):
if verbose:
print("Using PDF text.")
ocred_leaf = leaf
page_angle = 0
else:
if verbose:
print("Using OCR.")
OCR_SCALE = 1
im_scaled = leaf.image.resize(
np.int_(np.array(leaf.image.size) * OCR_SCALE)
)
ocr_result = ocr_engine.process(im_scaled)
ocred_leaf = ArchiveLeaf(
image=leaf.image,
page_number=leaf.page_number,
text_blocks=[
TextBlock(
x0=int(block.x0 / OCR_SCALE),
y0=int(block.y0 / OCR_SCALE),
x1=int(block.x1 / OCR_SCALE),
y1=int(block.y1 / OCR_SCALE),
text=block.text,
word_margins_all_directions = (
np.sort(
np.concat(
[
np.array(
[
block.x0,
block.y0,
im.size[0] - block.x1,
im.size[1] - block.y1,
]
)
for block in ocr_result.blocks
],
)
page_angle = ocr_result.page_angle
word_margins_all_directions = np.sort(
np.int_(
np.concat(
[
np.array(
[
block.x0,
block.y0,
leaf.image.size[0] - block.x1,
leaf.image.size[1] - block.y1,
]
)
for block in ocred_leaf.text_blocks
]
)
)
)
# Skip the n closest words to the edge, to help ignore stray OCR artifacts.
SKIP_WORDS = 2
text_margin_px = int(
word_margins_all_directions[SKIP_WORDS]
if word_margins_all_directions.shape[0] > SKIP_WORDS
else -1
for block in ocred_leaf.text_blocks
]
).astype(np.int_)
)
if len(ocred_leaf.text_blocks) > 0
else np.array([])
)
# Skip the n closest words to the edge, to help ignore stray OCR artifacts.
SKIP_WORDS = 2
text_margin_px = int(
word_margins_all_directions[SKIP_WORDS]
if word_margins_all_directions.shape[0] > SKIP_WORDS
else -1
)
# Make sure the OCR engine is running with orientation detection.
assert page_angle is not None
analyzed_pages.append(
{
"blank": is_blank,
"is_blank": is_blank,
"page_angle": page_angle,
"size_analyzed": leaf.image.size,
"sharpness": max_sharpness,
"size_analyzed": im.size,
"sharpness": sharpness,
"text_margin_px": text_margin_px,
}
)
@ -170,35 +131,58 @@ def analyze_doc(
return {"pages": analyzed_pages}
def normalize_contrast_for_text(im: Image.Image) -> tuple[Image.Image, bool]:
"""
Most of the pages being analyzed, and virtually all of the pages we care
about for the purposes of QA, primarily contain text on a contrasting
background. We can therefore typically assume that it is reasonable to boost
contrast so that the lightest pixels are nearly white and the darkest pixels
are nearly black. This can help make analysis more consistent across leaves
with varying contrast ratios due to varied scanner settings, contrast ratios
of the original documnets, or weathering/fading of the physical fiche.
Processed leaves usually contain some amount of margin around the edges
where the backlight of the scanning rig is visible through the unexposed
region of the negative, so contrast detection is heavily center-weighted.
Params:
im Scan image as a 2-dimensional numpy array. (Use `np.asarray()` to
convert PIL `Image` objects to an array format.)
Returns:
(normalized_image, is_blank)
"""
pixel_values = np.asarray(
im.crop(
(
im.size[0] * 0.1,
im.size[1] * 0.1,
im.size[0] * 0.9,
im.size[1] * 0.9,
)
)
)
# To avoid extreme outliers, use quantiles instead of absolute extrema.
extrema = (np.quantile(pixel_values, 0.002), np.quantile(pixel_values, 0.998))
if extrema[1] - extrema[0] < 64:
# Assume there is essentially no content here and return the original.
return im, True
# Apply a rudimentary tone curve to the image, with the goal that the
# extrema we just calculated will evaluate to values "pretty close to" 0%
# and 100% of the available range.
return im.point(
lambda x: np.interp(x, (0, extrema[0], extrema[1], 255), (0, 8, 247, 255))
), False
def analyze_sharpness(im: Image.Image):
"""
Crudely quantifies the "sharpness" of edges in an image, on a scale of 0 to
1. The scale is not linear with respect to scan quality: anything above 0.1
is usually fine.
1, by measuring peak intensity of a high-pass filter.
"""
arr = np.asarray(im)
# Normalize contrast based on brightest and darkest pixels. For example,
# NORM_QUANTILE=0.1 will attempt to transform pixel values so that 80% fall
# between 10% brightness and 90% brightness. In practice, a value around
# 0.02 seems to work fairly well.
NORM_QUANTILE = 0.03
pixel_range = np.quantile(arr, 1.0 - NORM_QUANTILE) - np.quantile(
arr, NORM_QUANTILE
)
if pixel_range == 0:
arr_normalized = arr
else:
arr_normalized = arr * (1.0 - NORM_QUANTILE * 2) / pixel_range
arr_normalized = (
arr_normalized - np.quantile(arr_normalized, NORM_QUANTILE) + NORM_QUANTILE
)
arr_normalized = np.uint8(np.clip(arr_normalized, 0, 1) * 255)
# "Sharpness" is determined by measuring the median intensity of pixels
# near edges, after an edge detection filter has been applied to the image.
edges_arr = np.asarray(
Image.fromarray(arr_normalized).filter(ImageFilter.FIND_EDGES)
)
EDGE_THRESHOLD = 8
return np.median(edges_arr[edges_arr > EDGE_THRESHOLD]) / 255
blurred = im.filter(ImageFilter.GaussianBlur(8))
diff = ImageChops.difference(im, blurred)
return np.quantile(diff, 0.999) / 255

View file

@ -66,8 +66,8 @@ class ArchiveDoc:
identifier archive.org identifier string, for example
`"micro_IA40386007_0012"`.
name Document name, with the item identifier, leading whitespace,
and file extension stripped.
name Document name, with the item identifier intact but file
extension stripped.
title Optional `title` metadata field assigned to the `_jp2.zip`
file, usually indicating that this file represents a subset

View file

@ -47,23 +47,6 @@ class TesseractOcrEngine(OcrEngine):
# TODO: Will this work for non-Latin scripts? Probably not all.
df = df[(df["width"] / df["height"]) > 0.8]
print(
[
TextBlock(
# Rotate X and Y coordinates back to match the original image.
*_box_after_rotation(
int(row["left"]),
int(row["top"]),
int(row["left"] + row["width"]),
int(row["top"] + row["height"]),
*rotated_image.size,
angle,
),
text=row["text"],
)
for _, row in df.iterrows()
]
)
if angle_best is None or df.shape[0] > len(blocks_best):
angle_best = angle
blocks_best = [

View file

@ -18,7 +18,5 @@ dependencies = [
[dependency-groups]
dev = [
"jedi>=0.19.2",
"python-lsp-server>=1.13.0",
"ruff>=0.12.8",
]

174
uv.lock generated
View file

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