def __init__(self, bbox):
self.bbox = core.Rect(bbox)
self.lines = []
self.glyphs = []
# stats
self.avg_glyph_area = 0
self.avg_glyph_height = 0
self.avg_glyph_width = 0
self.avg_line_height = 0
self.agv_line_width = 0
def display_lines(self, clear=1):
"""Display the lines found by placing a box around them
in a display. If clear is true then any boxes already on
the displayed are cleared first."""
if self.image._display is None:
self.image.display()
display = self.image._display
if clear:
display.clear_all_boxes()
for s in self.sections:
for line in s.lines:
b = line.bbox
display.add_box(
core.Rect(core.Point(b.ul_x, b.ul_y),
core.Dim(b.ncols, b.nrows)))
def display_sections(self, clear=1):
"""Display the sections found by placing a box around them
in a display. If clear is true then any boxes already on
the displayed are cleared first."""
# display the sections
result = self.sections
if self.image._display is None:
self.image.display()
display = self.image._display
if clear:
display.clear_all_boxes()
for rect in result:
b = rect.bbox
display.add_box(
core.Rect(core.Point(b.ul_x, b.ul_y),
core.Dim(b.ncols, b.nrows)))
def __init__(self, glyph):
self.center = 0
self.bbox = core.Rect(core.Point(glyph.ul_x, glyph.ul_y),
core.Dim(glyph.ncols, glyph.nrows))
self.glyphs = []
self.add_glyph(glyph)
def calculate_bbox(self):
assert (len(self.glyphs) > 0)
self.bbox = core.Rect(self.glyphs[0])
for glyph in self.glyphs:
self.bbox.union(glyph)
def find_sections(self):
"""Find the sections within an image - this finds large blocks
of text making it possible to find the lines within complex
text layouts."""
glyphs = self.glyphs
FUDGE = self.__avg_glyph_size(glyphs) * self.section_search_size
# remove noise and large objects
self.__noise_size = FUDGE
self.__large_size = FUDGE * 20
new_glyphs = []
for g in glyphs:
if self.__section_size_test(g):
new_glyphs.append(g)
else:
if self.__fill:
g.fill_white()
glyphs = new_glyphs
# Sort the glyphs left-to-right and top-to-bottom
glyphs.sort(lambda x, y: cmp(x.ul_x, y.ul_x))
glyphs.sort(lambda x, y: cmp(x.ul_y, y.ul_y))
# Create rectangles for each glyph that are bigger by FUDGE
big_rects = []
for g in glyphs:
ul_y = max(0, g.ul_y - FUDGE)
ul_x = max(0, g.ul_x - FUDGE)
lr_y = min(self.image.lr_y, g.lr_y + FUDGE)
lr_x = min(self.image.lr_x, g.lr_x + FUDGE)
ul_x = int(ul_x)
ul_y = int(ul_y)
nrows = int(lr_y - ul_y + 1)
ncols = int(lr_x - ul_x + 1)
big_rects.append(
core.Rect(core.Point(ul_x, ul_y), core.Dim(ncols, nrows)))
# Search for intersecting glyphs and merge them. This is
# harder than it seems at first because we want everything
# to merge together that intersects regardless of the order
# in the list. It ends up being similar to connected-component
# labeling. This is prone to be kind-of slow.
current = 0
rects = big_rects
while (1):
# Find the indexexes of any rects that interesect with current
inter = self.__find_intersecting_rects(rects, current)
# If we found intersecting rectangles merge them with them current
# rect, remove them from the list, and start the whole process
# over. We start over to make certain that everything that should
# be merged is.
if len(inter):
g = rects[current]
new_rects = [g]
for i in range(len(rects)):
if i == current:
continue
if i in inter:
g.union(rects[i])
else:
new_rects.append(rects[i])
rects = new_rects
current = 0
# If we didn't find anything that intersected move on to the next
# rectangle.
else:
current += 1
# Bail when we are done.
if current >= len(rects):
break
# Create the sections
sections = []
for rect in rects:
sections.append(Section(rect))
# Place the original (small) glyphs into the sections
for glyph in self.glyphs:
if self.__section_size_test(glyph):
for s in sections:
if s.bbox.intersects(glyph):
s.add_glyph(glyph)
break
# Fix up the bounding boxes
for s in sections:
s.calculate_bbox()
self.sections = sections