在Python中测试一个字形是否是同一字体中的另一个字形的反射 [英] Testing in Python whether one glyph is a reflection of another in the same font
问题描述
render_char
函数的两个不同的实现),但是我无法使用任何一个来将'('和')'识别为镜像。 from PIL import Image,ImageDraw,ImageFont
import freetype
import numpy as np
def render_char0(c):
#基于https://github.com/rougier/freetype-py/blob/master/examples/hello-world.py
#需要numpy(blech)和图像出来的方式相反,我期望
face = freetype.Face(/ Library / Fonts / Verdana.ttf)
face.set_char_size(48 * 64)
face.load_char(c)
bitmap = face.glyph.bitmap
w,h = bitmap.width,bitmap.rows
Z = np.array(bitmap。缓冲区,dtype = np.ubyte).reshape(h,w)
返回Image.fromarray(Z,mode ='L')。convert('1')
$ b $ def render_char1 c):
#基于https://stackoverflow.com/a/14446201/2829764
verdana_font = ImageFont.truetype(/ Library / Fonts / Verdana.ttf,20,encoding =unic )
text_width,text_height = verdana_font.getsize(c)
canvas = Image.new('RGB',(text_width + 10,text_height + 10) ,(255,255,255))
draw = ImageDraw.Draw(canvas)
draw.text((5,5),c,font = verdana_font,fill =#000000)
返回画布
为render_char在[render_char0,render_char1]:
lparen = render_char('(')
rparen = render_char(')')
镜像= lparen.transpose(Image.FLIP_LEFT_RIGHT)
mirror.show()
rparen.show()
print mirror.tobytes()== rparen.tobytes()#False
有一个名为 Unicode的纯文本数据库中的BidiMirroring.txt
,并带有所有镜像字符的列表。该文件很容易被程序解析。
当前网址是 http://www.unicode.org/Public/UNIDATA/BidiMirroring.txt
我不认为使用渲染字形可以可靠地工作。有很多原因,例如。 (
和)
不是精确的镜像,就像字符间距,提示和反锯齿,也许是字体其他字符是旋转的而不是镜像的,如和
在某些字体中,中文引号是「
和」
。 p>
Inspired by List of all unicode's open/close brackets? I'm trying to find a list of all unicode glyphs in a given font that are reflections of each other. First I just need to be able to test whether one glyph is a reflection of another. Below I have two different attempts (two different implementations of my render_char
function) but I'm not able to identify '(' and ')' as mirror images using either one. How can I do this?
from PIL import Image,ImageDraw,ImageFont
import freetype
import numpy as np
def render_char0(c):
# Based on https://github.com/rougier/freetype-py/blob/master/examples/hello-world.py
# Needs numpy (blech) and the image comes out the inverse of the way I expect
face = freetype.Face("/Library/Fonts/Verdana.ttf")
face.set_char_size( 48*64 )
face.load_char(c)
bitmap = face.glyph.bitmap
w,h = bitmap.width, bitmap.rows
Z = np.array(bitmap.buffer, dtype=np.ubyte).reshape(h,w)
return Image.fromarray(Z, mode='L').convert('1')
def render_char1(c):
# Based on https://stackoverflow.com/a/14446201/2829764
verdana_font = ImageFont.truetype("/Library/Fonts/Verdana.ttf", 20, encoding="unic")
text_width, text_height = verdana_font.getsize(c)
canvas = Image.new('RGB', (text_width+10, text_height+10), (255, 255, 255))
draw = ImageDraw.Draw(canvas)
draw.text((5,5), c, font = verdana_font, fill = "#000000")
return canvas
for render_char in [render_char0, render_char1]:
lparen = render_char('(')
rparen = render_char(')')
mirror = lparen.transpose(Image.FLIP_LEFT_RIGHT)
mirror.show()
rparen.show()
print mirror.tobytes() == rparen.tobytes() # False
There is a text file called BidiMirroring.txt
in the Unicode plain-text database with a list of all mirrored characters. That file is easy to parse by programs.
Current url is http://www.unicode.org/Public/UNIDATA/BidiMirroring.txt
I don't think using the rendered glyphs can work reliably. There's a lot of reasons why eg. (
and )
are no exact mirror images, like spacing around the character, hinting and anti-aliasing, maybe the font is slightly slanted, or maybe the font designer has just make the two brackets a bit different etc. Other characters are rotated, rather than mirrored, like "
and "
in some fonts, and the Chinese quotation marks 「
and 」
.
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