如何从 Python 中的图像中删除空白？

Question

我有一组从代码输出的图像，我希望能够删除图像中所有多余的空白，以便将图像缩小为仅图像中的文本。这是相关代码：

from PIL import Image, ImageFont, ImageDraw, ImageChops
from docx import Document
import textwrap
import re

doc = Document('Patents.docx')
docText = ''.join(paragraph.text for paragraph in doc.paragraphs)


def trim(im, color):
    bg = Image.new(im.mode, im.size, color)
    diff = ImageChops.difference(im, bg)
    diff = ImageChops.add(diff, diff)
    bbox = diff.getbbox()
    if bbox:
        return im.crop(bbox)


for match in find_matches(text=docText, keywords=("responsive", "detecting", "providing")):
    W, H = 300, 300
    body = Image.new('RGB', (W, H), (255, 255, 255))
    border = Image.new('RGB', (W + 4, H + 4), (0, 0, 0))
    border.save('border.png')
    body.save('body.png')
    patent = Image.open('border.png')
    patent.paste(body, (2, 2))
    draw = ImageDraw.Draw(patent)
    font = ImageFont.load_default()

    current_h, pad = 100, 20

    for key in textwrap.wrap(match, width=45):
        line = key.encode('utf-8')
        # (width, height) = font.getsize(line)
        # patent.resize((width, height), resample=0, box=None)
        w, h = draw.textsize(line, font=font)
        draw.text(((W - w) / 2, current_h), line, (0, 0, 0), font=font)
        current_h += h + pad
    for count, matches in enumerate(match):
        patent.save(f'{match}.png')
        patentCrop = trim(patent, 255)
        patentCrop.save(f'{match}_new.png')

这是我构建的代码的 4 个输出中的 2 个（每个框都是它自己的输出）：

我想保留边框，但显然我总是不能使用边框然后裁剪图像然后添加边框，但无论如何，我需要帮助删除空白。如我的代码所示，我正在使用 trim 函数，但它似乎出于某种原因无法正常工作。如果有任何解决方案，无论是修复我的功能还是完全不同的方法，我都非常感谢您的帮助。以下是我想要完成的，当然，每个框都是它自己的输出：

Answer 1

我认为这就是您想要的 - 一种双垫环绕声：

#!/usr/bin/env python3

from PIL import Image, ImageDraw, ImageOps

# Open input image
im = Image.open('zHZB9.png')

# Get rid of existing black border by flood-filling with white from top-left corner
ImageDraw.floodfill(im,xy=(0,0),value=(255,255,255),thresh=10)

# Get bounding box of text and trim to it
bbox = ImageOps.invert(im).getbbox()
trimmed = im.crop(bbox)

# Add new white border, then new black, then new white border
res = ImageOps.expand(trimmed, border=10, fill=(255,255,255))
res = ImageOps.expand(res, border=5, fill=(0,0,0))
res = ImageOps.expand(res, border=5, fill=(255,255,255))
res.save('result.png')

如何从 Python 中的图像中删除空白？

How to remove whitespace from an image in Python?

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