OpenALPR识别俄式车牌时字符顶部被截断的问题求助

问题描述 #

我在使用OpenALPR工具识别俄式车牌时遇到了一个棘手的问题：OCR会截断数字的上部区域，导致识别结果不准确。相关效果如下：

处理前的车牌图像：

处理后的识别效果（数字上部被截断）：

原始车牌照片参考：

已尝试的操作 #

我专门针对俄式车牌生成了新的.conf配置文件，参数设置如下：

char_analysis_min_pct = 0.29 
char_analysis_height_range = 0.20 
char_analysis_height_step_size = 0.10 
char_analysis_height_num_steps = 6 
segmentation_min_speckle_height_percent = 0.3 
segmentation_min_box_width_px = 6 
segmentation_min_charheight_percent = 0.1; 
segmentation_max_segment_width_percent_vs_average = 1.95; 
plate_width_mm= 520 
plate_height_mm = 112 
multiline = 1 
char_height_mm = 58 
char_width_mm = 44 
char_whitespace_top_mm = 18 
char_whitespace_bot_mm = 18 
template_max_width_px = 300 
template_max_height_px = 64 
; Higher sensitivity means less lines 
plateline_sensitivity_vertical = 10 
plateline_sensitivity_horizontal = 45 
; Regions smaller than this will be disqualified 
min_plate_size_width_px = 65 
min_plate_size_height_px = 18 
; Results with fewer or more characters will be discarded 
postprocess_min_characters = 8 
postprocess_max_characters = 9 
;detector_file= eu.xml 
ocr_language = lamh 
;Override for postprocess letters/numbers regex. 
postprocess_regex_letters = [A,B,C,E,H,K,M,O,P,T,X,Y] 
postprocess_regex_numbers = [0-9] 
; Whether the plate is always dark letters on light background, light letters on dark background, or both 
; value can be either always, never, or auto 
invert = auto 

另外，我最初使用的OCR文件来自GitHub上KostyaKulakov的Russian_System_of_ANPR仓库。

求助 #

请问哪位有相关经验的朋友可以指点一下，该如何解决这个OCR截断数字上部区域的问题？万分感谢！

内容的提问来源于stack exchange，提问作者MarCovy