Implement border detection

base_proxy.py

@@ -3,6 +3,24 @@ from pathlib import Path
 CARD_W_INCHES = 2.48031  # 63mm
 CARD_H_INCHES = 3.46457  # 88mm
 
+W_INCHES_EXPECTED = 2.72
+H_INCHES_EXPECTED = 3.7
+
 LEAVE_BLEED_INCHES = 0.04
 
 BASE_DIR = Path(__file__).parent
+
+SAVE_INTERMEDIATE_FOR_DEBUG = False
+
+
+def make_intermediate_name(input_path: Path, infix: str):
+    return BASE_DIR / 'cropped_cards' / f'{input_path.stem}.{infix}.jpg'
+
+
+def in_to_px(inches: float, dpi: int) -> int:
+    return round(inches * dpi)
+
+
+def mil_to_px(mils: int, dpi: int) -> int:
+    return int(mils * dpi // 1000)
+

border_detection.py

@@ -0,0 +1,179 @@
+import dataclasses
+from typing import Dict, List, Tuple
+
+from PIL import ImageDraw, Image
+
+from base_proxy import *
+
+
+TOP = 'top'
+BOTTOM = 'bottom'
+LEFT = 'left'
+RIGHT = 'right'
+
+
+@dataclasses.dataclass
+class PixelColorBuckets:
+    blacks: int = 0
+    whites: int = 0
+    others: int = 0
+
+
+def border_color_to_rgb(border_color: str) -> Tuple[int, int, int]:
+    return {
+        Borders.SOLID_BLACK: (0, 0, 0),
+        Borders.SOLID_WHITE: (255, 255, 255),
+    }.get(border_color)
+
+
+@dataclasses.dataclass
+class Borders:
+    SOLID_BLACK = 'solid_black'
+    SOLID_WHITE = 'solid_white'
+    BORDERLESS = 'borderless'
+    UNKNOWN = 'unknown'
+
+    dpi: float = None
+    color: Dict[str, str] = dataclasses.field(default_factory=dict)
+    thickness: Dict[str, int] = dataclasses.field(default_factory=dict)
+
+    def inform_color(self, edge: str, all_color_buckets: Dict[int, PixelColorBuckets]) -> None:
+        any_others = any(b.others > 0 for b in all_color_buckets.values())
+        any_blacks = any(b.blacks > 0 for b in all_color_buckets.values())
+        any_whites = any(b.whites > 0 for b in all_color_buckets.values())
+        if any_others:
+            self.color[edge] = Borders.BORDERLESS
+        elif any_blacks and any_whites:
+            self.color[edge] = Borders.UNKNOWN
+        elif any_blacks:
+            self.color[edge] = Borders.SOLID_BLACK
+        elif any_whites:
+            self.color[edge] = Borders.SOLID_WHITE
+        else:
+            self.color[edge] = Borders.UNKNOWN
+
+    def inform_depth(self, edge: str, depths: Dict[int, int]) -> None:
+        self.thickness[edge] = min(depths.values())
+
+    def get_border_thickness_in(self, edge: str) -> float:
+        return self.thickness[edge] / self.dpi
+
+
+@dataclasses.dataclass
+class CardBox:
+    left: int
+    top: int
+    width: int
+    height: int
+
+    def get_sample_xs(self, sample_count: int) -> List[int]:
+        xs = []
+        for i in range(sample_count):
+            x = self.left + (i * (self.width - 1)) // (sample_count - 1)
+            xs.append(x)
+        return xs
+
+    def get_sample_ys(self, sample_count: int) -> List[int]:
+        ys = []
+        for i in range(sample_count):
+            y = self.top + (i * (self.height - 1)) // (sample_count - 1)
+            ys.append(y)
+        return ys
+
+
+def categorize_pixels_in_line(im: Image, start: Tuple[int, int], increment: Tuple[int, int], depth: int) -> PixelColorBuckets:
+    color_buckets = PixelColorBuckets()
+
+    xy = start
+    for n in range(depth):
+        pixel = im.getpixel(xy)
+        if pixel == (0, 0, 0):
+            color_buckets.blacks += 1
+        elif pixel == (255, 255, 255):
+            color_buckets.whites += 1
+        else:
+            color_buckets.others += 1
+        xy = (xy[0] + increment[0], xy[1] + increment[1])
+
+    return color_buckets
+
+
+def detect_depth_in_column(im: Image, color: str, fixed_x: int, start: int, increment: int, max_depth: int) -> int:
+    expected_rgb = border_color_to_rgb(color)
+    y = start
+    for n in range(max_depth):
+        pixel = im.getpixel((fixed_x, y))
+        if expected_rgb != pixel:
+            return n - 1
+        y += increment
+    else:
+        return max_depth
+
+
+def detect_borders(loaded_input_card: 'InputCardImage') -> Borders:
+    dpi: int = loaded_input_card.input_dpi
+    im: Image = loaded_input_card.original_im
+    assert dpi is not None
+    assert im is not None
+
+    input_w = im.size[0]
+    input_h = im.size[1]
+    card_w = in_to_px(CARD_W_INCHES, dpi)
+    card_h = in_to_px(CARD_H_INCHES, dpi)
+    bleed_left = (input_w - card_w) // 2
+    bleed_top = (input_h - card_h) // 2
+    card_box = CardBox(bleed_left, bleed_top, card_w, card_h)
+
+    if SAVE_INTERMEDIATE_FOR_DEBUG:
+        draw = ImageDraw.Draw(im)
+
+    borders = Borders()
+    borders.dpi = dpi
+
+    depth_to_calibrate = mil_to_px(10, dpi)
+    max_depth_to_check = in_to_px(0.5, dpi)
+    border_depth = 0
+
+    # Sample 30 lines
+    xs = card_box.get_sample_xs(30)
+    ys = card_box.get_sample_ys(30)
+
+    # Determine top and bottom border color
+    for edge, start_y, increment_y in [(TOP, 0, +1), (BOTTOM, input_h - 1, -1)]:
+        all_color_buckets = {}
+        for fixed_x in xs:
+            color_buckets = categorize_pixels_in_line(im, (fixed_x, start_y), (0, increment_y), depth_to_calibrate)
+            all_color_buckets[fixed_x] = color_buckets
+        borders.inform_color(edge, all_color_buckets)
+
+    # Determine left and right border color
+    for edge, start_x, increment_x in [(LEFT, 0, +1), (RIGHT, input_w - 1, -1)]:
+        all_color_buckets = {}
+        for fixed_y in ys:
+            color_buckets = categorize_pixels_in_line(im, (start_x, fixed_y), (increment_x, 0), depth_to_calibrate)
+            all_color_buckets[fixed_y] = color_buckets
+        borders.inform_color(edge, all_color_buckets)
+
+    # Determine top and bottom border thickness
+    for edge, start, increment in [(TOP, 0, +1), (BOTTOM, input_h - 1, -1)]:
+        all_depths = {}
+        color = borders.color[edge]
+        if color in (Borders.SOLID_BLACK, Borders.SOLID_WHITE):
+            for fixed_x in xs:
+                depth = detect_depth_in_column(im, color, fixed_x, start, increment, max_depth_to_check)
+                all_depths[fixed_x] = depth
+                if SAVE_INTERMEDIATE_FOR_DEBUG:
+                    draw.line([(fixed_x, start), (fixed_x, start + increment * depth)], fill='magenta')
+
+            borders.inform_depth(edge, all_depths)
+
+            if SAVE_INTERMEDIATE_FOR_DEBUG:
+                depth_calculated = borders.thickness[edge]
+                border_y_calculated = start + increment * depth_calculated
+                draw.line([(0, border_y_calculated), (input_w - 1, border_y_calculated)], fill='magenta')
+
+    if SAVE_INTERMEDIATE_FOR_DEBUG:
+        path = make_intermediate_name(loaded_input_card.path, 'step0bordercheck')
+        im.save(path, 'JPEG', dpi=(dpi, dpi), quality=100, subsampling=0)
+
+    return borders

card_images.py

@@ -2,25 +2,24 @@ from pathlib import Path
 
 from PIL import Image
 
-from base_proxy import BASE_DIR
+from base_proxy import *
+from border_detection import Borders, detect_borders
 from sheet_layout import SheetLayout, CardImageTransfer
 
 
-W_INCHES_EXPECTED = 2.72
-H_INCHES_EXPECTED = 3.7
-
-SAVE_INTERMEDIATE_FOR_DEBUG = False
-
-
-def make_intermediate_name(input_path: Path, infix: str):
-    return BASE_DIR / 'cropped_cards' / f'{input_path.stem}.{infix}.jpg'
-
-
 class InputCardImage:
     def __init__(self, path: Path):
         self.path = path
         self.input_dpi = None
         self.original_im = None
+        self.borders = None
+
+    def get_borders(self) -> Borders:
+        if self.borders is None:
+            self.load()
+            self.borders = detect_borders(self)
+            self.unload()
+        return self.borders
 
     def load(self) -> None:
         with Image.open(self.path) as im:
@@ -35,9 +34,11 @@ class InputCardImage:
             self.input_dpi = dpi_by_w
             self.original_im = rgb_im
 
-    def get_cropped_and_resized(self, layout: SheetLayout, transfer: CardImageTransfer) -> Image:
+    def unload(self) -> None:
-        new_dpi = layout.dpi
+        self.input_dpi = None
+        self.original_im = None
 
+    def get_cropped_and_resized(self, layout: SheetLayout, transfer: CardImageTransfer) -> Image:
         self.load()
         im = self.original_im
         print(f'Input is {im.size[0]} x {im.size[1]}')
@@ -72,4 +73,6 @@ class InputCardImage:
         if SAVE_INTERMEDIATE_FOR_DEBUG:
             im.save(make_intermediate_name(self.path, 'step2crop'), 'JPEG', dpi=(layout.dpi, layout.dpi), quality=100, subsampling=0)
 
+        self.unload()
+
         return im

crop_card.py

@@ -13,6 +13,9 @@ from sheet_layout import SheetLayout, CardImageTransfer
 import util
 
 
+DRY_RUN = False
+
+
 CUT_GUIDE_WIDTH_INCHES = 0.006
 LENGTH_CUT_GUIDE_INCHES = 0.04
 
@@ -96,6 +99,7 @@ def create_sheet(input_cards: List[InputCardImage], sheet_filepath: Path, layout
             draw.line([(right_x, bottom_y), (right_x - guide_len, bottom_y)], fill = color, width = guide_thickness)
 
     # Save sheet
+    if not DRY_RUN:
         # sheet.save(sheet_filepath, 'JPEG', dpi=(layout.dpi, layout.dpi), quality=100, subsampling=0, icc_profile=icc_profile.tobytes())
         sheet.save(sheet_filepath, 'JPEG', dpi=(layout.dpi, layout.dpi), quality=100, subsampling=0)
 
@@ -106,6 +110,8 @@ def main():
     print(all_input_cards_paths)
 
     all_input_cards = [InputCardImage(p) for p in all_input_cards_paths]
+    for input_card in all_input_cards:
+        print(f'{input_card.path} has borders {input_card.get_borders()}')
 
     layout = sheet_layout.letter_portrait_3x3_sheet_layout_120milborder()
     sheets_dir = BASE_DIR / 'sheets'

sheet_layout.py

@@ -2,7 +2,7 @@ import dataclasses
 import math
 from typing import List, Tuple
 
-from base_proxy import CARD_W_INCHES, CARD_H_INCHES, LEAVE_BLEED_INCHES
+from base_proxy import *
 
 
 @dataclasses.dataclass
@@ -122,10 +122,10 @@ class SheetLayout:
         print(self.__dict__)
 
     def in_to_px(self, inches: float) -> int:
-        return round(inches * self.dpi)
+        return in_to_px(inches, self.dpi)
 
     def mil_to_px(self, mils: int) -> int:
-        return mils * self.dpi // 1000
+        return mil_to_px(mils, self.dpi)
 
     def create_card_image_transfer(self, y_index: int, x_index: int) -> CardImageTransfer:
         top_row = y_index == 0