多线程并发起来有些车牌无法识别到

[clancylian]

采用python flask做成服务接口，如果在构造函数中新建车牌识别对象，然后在接口中调用车牌识别函数，当并发起来时，有些车牌无法识别到，但是将这些无法识别的车牌，用单张调用接口，可以识别到，是因为不支持多线程吗？

[qianxiaoer]

哈罗，邮件收到了，我会尽快查看，回复，谢谢！

[tunmx]

能把调用方法的代码片段分享一下吗

[clancylian]

class PlateDetector():

detector = None

def __init__(self, level='high'):
    self.detector = lpr3.LicensePlateCatcher(detect_level=lpr3.DETECT_LEVEL_HIGH if level=='high' else lpr3.DETECT_LEVEL_LOW)

def format_plate(self, plate):
    plate_type = type_list[plate[2]]
    if plate_type == '绿牌新能源' and not plate[0][2].isalpha():
        plate_type = '蓝牌'
    return { 
                'hphm' : plate[0],
                'hpwz' : ",".join([str(c)for c in plate[3]]),
                'hpzl' : plate_type,
                'kxd' : '%.2f' % (plate[1])
            }

def detect(self, img_b64, roi):
    image = conv_b64str_2_img(img_b64)
    result = self.detector(image)
    return [    
        self.format_plate(plate) 
        for plate in result if roi==[] or box_is_within_poly(plate[3], roi, 'ct')
    ]

---

def main():

opt = parse_opt()
global PD,
print('[INIT] Detectors : Initializing ... ', end='', flush=True)
PD = PlateDetector()
print('Done.')

    
app.run(host=opt.host, port=opt.port, debug=False)

---

@app.route(API_ROUTE + '/detect_plates', methods=['POST'])
@register_handler('request', 'json', True, 'POST')
@register_handler('data', 'detect')
def detect_plates(data):

count, images= data.get('count'), data.get('images')
images_result = { k : PD.detect( images[k].get('image'), DM.check_parking_roi(images[k].get('parkingid')) if APPLY_ROI else []) for k in images}
return { 'count' : count, 'images' : images_result }