hr-ocr-bankcard/core/parser.py

import re
import string
from dataclasses import dataclass
from collections import defaultdict
import numpy as np
import cpca
from typing import List

from core.line_parser import OcrResult


@dataclass
class RecItem:
    text: str = ''
    confidence: float = 0.

    def to_dict(self):
        return {"text": self.text, "confidence": np.nan_to_num(self.confidence)}


def find_card_row(line_results):
    print('~~~~line results~~~~~')
    for row in line_results:
        print('++++')
        print(row)
    print('~~~~line results~~~~~')

    new_lines = []
    for row in line_results:
        new_line = []
        for r in row:
            if r.conf > 0.93:
                new_line.append(r)
        if new_line:
            new_lines.append(new_line)

    print('~~~~new line results~~~~~')
    for row in new_lines:
        print('++++')
        print(row)
    print('~~~~new line results~~~~~')
    line_results = new_lines

    for row in line_results:
        txt = [r.txt.replace(' ', '') for r in row]
        conf = np.mean([r.conf for r in row])
        txt = ''.join(txt)
        res = re.findall('\d{15,20}', txt)
        print(f'res: {res}, conf: {conf}')
        if res and conf > 0.95:
            return row, res[0], conf
    raise Exception('无法识别')


def handle_wrong_digits(s):
    s = s.replace(' ', '')
    s = s.replace('-', '')
    s = s.replace('/', '')
    s = s.replace('L', '1')
    s = s.replace('l', '1')
    if s.startswith('1'):
        s = s[1:]
    if s.startswith('1'):
        s = '6' + s[1:]
    return s


class Parser(object):
    def __init__(self, line_results: List[List[OcrResult]]):
        self.line_results = line_results
        self.res = defaultdict(RecItem)
        self.res["number"] = RecItem()

    def bank_no(self):
        # 号码
        row, txt, conf = find_card_row(self.line_results)
        print(f'=== txt: {txt}, res: {row}======')
        txt = handle_wrong_digits(txt)
        self.res['number'] = RecItem(txt, conf)

    def parse(self):
        self.bank_no()
        return self.res