python2和python3实现在图片上加汉字

末蓝、 2021-11-17 00:06 278阅读 0赞

### 文章目录 ###

*  Python2 在图片上加汉字代码实现
 *  Python3 在图片上加汉字代码实现
 *  遇到的问题

python2和python3实现在图片上加汉字,最主要的区别还是内部编码方式不一样导致的,在代码上表现为些许的差别。理解了内部编码原理也就不会遇到这些问题了，以下代码是在WIN10系统上时测好用的。

# Python2 在图片上加汉字代码实现 #

# -*- coding: cp936 -*-
    import cv2
    import numpy as np
    
    from PIL import Image, ImageDraw, ImageFont
    
    def ID_2_Word(txt):
    
        tmp_ID = txt.split(':')[0]
    
        value = txt.split(':')[-1]
    
        '''
        numbers = {
            'DS041' : "Coolant TEMP          ",
            'DS048' : "RPM                   ",
            'DS049' : "Speed                 ",
            'DS098' : "Oil level             ",
            'DS123' : "Control Module Voltage"
        }
    
        '''
        numbers = {
            'DS041' : "冷却液温度",
            'DS048' : "发动机转速",
            'DS049' : "车速   ",
            'DS098' : "燃油液位输入",
            'DS123' : "控制模块电压"
        }
        
    
        word = numbers.get(tmp_ID, None)
        
        result = str(word) + ':' + value
    
        #print(result)
    
        return result
    
    
    def cv2ImgAddText(img, text, left, top, textColor=(0, 255, 0), textSize=20):
        if (isinstance(img, np.ndarray)):  #判断是否OpenCV图片类型
            img = Image.fromarray(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
        draw = ImageDraw.Draw(img)
        #fontText = ImageFont.truetype("font/simsun.ttc", textSize, encoding="utf-8")
        fontText = ImageFont.truetype("font/simsun.ttc", textSize, encoding="gb2312") #cp936
        draw.text((left, top), text, textColor, font=fontText)
        return cv2.cvtColor(np.asarray(img), cv2.COLOR_RGB2BGR)
    
    def layer1_show(img,data):
    
        
    
        frame =  cv2.resize(img, (1280, 720), interpolation=cv2.INTER_CUBIC)
    
        font = ImageFont.truetype('font/simsun.ttc',24,encoding="utf-8")
    
            
    
        OBD_string = data
       
        y0, dy = 50, 25
            
        for i, txt in enumerate(OBD_string.split(';')):
                
                
                #word = txt
            word = ID_2_Word(txt) #将OBD信号的ID转换为中文
            
            word = unicode(word,'gbk')
                #print(i, txt.split(':')[0])
            y = y0+i*dy
            
            frame = cv2ImgAddText(frame, word, 100, y, (255, 0, 0), 20)
    
            
        cv2.imshow("layer_1", frame)
        cv2.waitKey(0)
            
    
        
    
    
    
    if __name__ == '__main__':
        img = cv2.imread("map.png");
        
        data = "DS041: 88;DS048: 800;DS049: 64;DS098: 0.00;DS123: 0.00"
        layer1_show(img,data)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hpYW9fbHhs_size_16_color_FFFFFF_t_70]

# Python3 在图片上加汉字代码实现 #

import cv2
    import numpy as np
    
    from PIL import Image, ImageDraw, ImageFont
    
    def ID_2_Word(txt):
    
        tmp_ID = txt.split(':')[0]
    
        value = txt.split(':')[-1]
    
        '''
        numbers = {
            'DS041' : "Coolant TEMP          ",
            'DS048' : "RPM                   ",
            'DS049' : "Speed                 ",
            'DS098' : "Oil level             ",
            'DS123' : "Control Module Voltage"
        }
    
        '''
        numbers = {
            'DS041' : "冷却液温度",
            'DS048' : "发动机转速",
            'DS049' : "车速   ",
            'DS098' : "燃油液位输入",
            'DS123' : "控制模块电压"
        }
        
    
        word = numbers.get(tmp_ID, None)
        
        result = str(word) + ':' + value
    
        #print(result)
    
        return result
    
    
    def cv2ImgAddText(img, text, left, top, textColor=(0, 255, 0), textSize=20):
        if (isinstance(img, np.ndarray)):  #判断是否OpenCV图片类型
            img = Image.fromarray(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
        draw = ImageDraw.Draw(img)
        #fontText = ImageFont.truetype("font/simsun.ttc", textSize, encoding="utf-8")
        fontText = ImageFont.truetype("font/simsun.ttc", textSize, encoding="gb2312") #cp936
        draw.text((left, top), text, textColor, font=fontText)
        return cv2.cvtColor(np.asarray(img), cv2.COLOR_RGB2BGR)
    
    def layer1_show(img,data):
    
        
    
        frame =  cv2.resize(img, (1280, 720), interpolation=cv2.INTER_CUBIC)
    
        font = ImageFont.truetype('font/simsun.ttc',24,encoding="utf-8")
    
            
    
        OBD_string = data
      
    
        y0, dy = 50, 25
            
        for i, txt in enumerate(OBD_string.split(';')):
                
                
                #word = txt
            word = ID_2_Word(txt) #将OBD信号的ID转换为中文
            
            #word = unicode(word,'gbk')
               
            y = y0+i*dy
            
            frame = cv2ImgAddText(frame, word, 100, y, (255, 0, 0), 20)
    
            
        cv2.imshow("layer_1", frame)
        cv2.waitKey(0)
            
    
        
    
    
    
    if __name__ == '__main__':
        img = cv2.imread("map.png");
        
        data = "DS041: 88;DS048: 800;DS049: 64;DS098: 0.00;DS123: 0.00"
        layer1_show(img,data)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hpYW9fbHhs_size_16_color_FFFFFF_t_70 1]

# 遇到的问题 #

python2中：UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xe8 in position 0: ordinal not in range(128)

这是因为这是因为默认的是utf-8编码格式

中文字符的Unicode编码0x0800-0xFFFF之间,(utf-8包含了部分汉字)  
当你试图将该“中文字符”转成U码的utf-8时超出了其范筹  
而GBK 规范收录了 ISO 10646.1 中的全部 CJK 汉字和符号，并有所补充，  
所以**解决方法是将utf-8改为gbk**

word = unicode(word,'utf-8') 改为 word = unicode(word,'gbk')

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hpYW9fbHhs_size_16_color_FFFFFF_t_70]: /images/20211116/d43fea54b6414af7afd185eadc7ecf9d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hpYW9fbHhs_size_16_color_FFFFFF_t_70 1]: /images/20211116/30373f7181dc4917bf1cc7050d8b849e.png