license-plate-recognition-barrier-0001

Use Case and High-Level Description

This model uses a small-footprint network trained end-to-end to recognize Chinese license plates in traffic.

Validation Dataset - Internal

1165 Chinese plates from different provinces

Example

Note: The license plates on the image were modified to protect the owners' privacy.

Specification

Metric Value
Rotation in-plane ±10˚
Rotation out-of-plane Yaw: ±45˚ / Pitch: ±45˚
Min plate width 94 pixels
Ratio of correct reads 88.58%
GFlops 0.328
MParams 1.218
Source framework Caffe*

Limitations

Only "blue" license plates, which are common in public, were tested thoroughly. Other types of license plates may underperform.

Inputs

  1. name: "data" , shape: [1x3x24x94] - An input image in following format [1xCxHxW]. Expected color order is BGR.
  2. name: "seq_ind" , shape: [88,1] - An auxiliary blob that is needed for correct decoding. Set this to [0, 1, 1, ..., 1].

Outputs

  1. name: "decode", shape: [1, 88, 1, 1] - Encoded vector of floats. Each float is an integer number encoding a character according to this dictionary:
     0 0
     1 1
     2 2
     3 3
     4 4
     5 5
     6 6
     7 7
     8 8
     9 9
     10 <Anhui>
     11 <Beijing>
     12 <Chongqing>
     13 <Fujian>
     14 <Gansu>
     15 <Guangdong>
     16 <Guangxi>
     17 <Guizhou>
     18 <Hainan>
     19 <Hebei>
     20 <Heilongjiang>
     21 <Henan>
     22 <HongKong>
     23 <Hubei>
     24 <Hunan>
     25 <InnerMongolia>
     26 <Jiangsu>
     27 <Jiangxi>
     28 <Jilin>
     29 <Liaoning>
     30 <Macau>
     31 <Ningxia>
     32 <Qinghai>
     33 <Shaanxi>
     34 <Shandong>
     35 <Shanghai>
     36 <Shanxi>
     37 <Sichuan>
     38 <Tianjin>
     39 <Tibet>
     40 <Xinjiang>
     41 <Yunnan>
     42 <Zhejiang>
     43 <police>
     44 A
     45 B
     46 C
     47 D
     48 E
     49 F
     50 G
     51 H
     52 I
     53 J
     54 K
     55 L
     56 M
     57 N
     58 O
     59 P
     60 Q
     61 R
     62 S
     63 T
     64 U
     65 V
     66 W
     67 X
     68 Y
     69 Z
    

Legal Information

[*] Other names and brands may be claimed as the property of others.