working image to bitmap converter for 2 bit grayscale

imageconverter/img2array.py

@@ -3,6 +3,28 @@ import math
 import argparse
 import os.path
 
+
+def swapBits(number, nbits):
+    if nbits==2:
+        bitstring = '{0:02b}'.format(number)
+    if nbits==3:
+        bitstring = '{0:03b}'.format(number)
+    if nbits==4:
+        bitstring = '{0:04b}'.format(number)
+    if nbits==5:
+        bitstring = '{0:05b}'.format(number)
+    if nbits==6:
+        bitstring = '{0:06b}'.format(number)
+    if nbits==7:
+        bitstring = '{0:07b}'.format(number)
+    if nbits==8:
+        bitstring = '{0:08b}'.format(number)
+
+    bitstring=bitstring[::-1]   
+
+    return int(bitstring, 2)
+
+
 parser = argparse.ArgumentParser(
                     prog = 'Image Edit Script',
                     description = 'Manipulate or extract information from an image file',
@@ -10,17 +32,29 @@ parser = argparse.ArgumentParser(
 
 parser.add_argument('filename')           # positional argument
 parser.add_argument('-n', '--bytesperline')
-parser.add_argument('-b', '--lsbfirst', action='store_true')
+parser.add_argument('-d', '--bitdepth')
+parser.add_argument('-b', '--lsbfirst', action='store_true') #lsb first for the whole byte
+parser.add_argument('-c', '--colorlsbfirst', action='store_true') #lsb first for a single color
 parser.add_argument('-i', '--invert', action='store_true')
 
 args = parser.parse_args()
 
 lsbfirst=args.lsbfirst
+colorlsbfirst=args.colorlsbfirst
 invert=args.invert
 
+
+bitdepth=1
+if args.bitdepth is not None:
+    _bd=int(int(args.bitdepth))
+    if _bd!=1 and _bd!=2 and _bd!=4 and _bd!=8:
+        print("bitdepth needs to be 1, 2, 4, or 8")
+        exit()
+    bitdepth=_bd
+
 bytesperline=16
 if args.bytesperline is not None:
-    bytesperline=args.bytesperline #for output formatting
+    bytesperline=int(args.bytesperline) #for output formatting
 
 
 im = Image.open(args.filename) # Can be many different formats.
@@ -30,7 +64,6 @@ print(im.size)  # Get the width and hight of the image for iterating over
 
 array=[] #array with every element a byte
 
-thresh=128 #threshold brightness
     
 def calculateDistance(x1,y1,x2,y2):  
     dist = math.sqrt((x2 - x1)**2 + (y2 - y1)**2)  
@@ -44,23 +77,40 @@ for y in range(im.size[1]):
         r=c[0]
         g=c[1]
         b=c[2]
+        
+        _a=int((r+g+b)/3 )
+        brightness=int(_a)
+
+        brightnessreduced=brightness>>(8-bitdepth) #reduce to bitdepth
+
+        brightnessreduced_byte=brightnessreduced<<(8-bitdepth) #scale back to byte
+        pix[x,y]=(brightnessreduced_byte,brightnessreduced_byte,brightnessreduced_byte)
+
+        
         if invert:
-            r=255-r
-            g=255-g
-            b=255-b
+            brightnessreduced=pow(2,bitdepth)-1-brightnessreduced #only invert txt output
 
-        if ((r+g+b)/3 < thresh ): #black
-            if lsbfirst:
-                temp_byte+=1<<temp_byte_pos
-            else:
-                temp_byte+=1<<(7-temp_byte_pos)
+        if colorlsbfirst:
+            brightnessreduced=swapBits(brightnessreduced,bitdepth)
 
-        temp_byte_pos+=1
+
+        temp_byte+=brightnessreduced<<temp_byte_pos #add to current byte
+        
+        
+
+        temp_byte_pos+=bitdepth
+        #print("temp byte "+str(temp_byte)+" pos="+str(temp_byte_pos)+" brightnessreduced="+str(brightnessreduced))
         if temp_byte_pos>=8: #finished assemblying byte
+            if lsbfirst: #swap bit order
+                temp_byte=swapBits(temp_byte,8)
             array.append(temp_byte)
+            #print("appending "+str(temp_byte))
             temp_byte_pos=0 #reset
             temp_byte=0
 
+
+im.save(args.filename+'_result'+'.png')
+
         
 if os.path.isfile(args.filename+'.txt'):
     print("Outputfile "+args.filename+".txt exists")
@@ -71,14 +121,10 @@ with open(args.filename+'.txt', 'w') as f:
     f.write('\r\n')
     counter=0
     for a in array: #for every byte
-        f.write("0X{:02X}".format(a)+',') #Example output: 0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
+        hexstring="0X{:02X}".format(a)
+        f.write(hexstring+',') #Example output: 0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
         counter+=1
         if counter>=bytesperline:
             f.write('\r\n')
             counter=0
     f.write("};")
-
-
-    
-
-

src/main.cpp

@@ -21,10 +21,10 @@ void setup()
     EPD_4IN2_Clear(); //flashed black 2 times. long, short
 
 
-
+    /*
     //Create a new image cache
     UBYTE *BWImage;
-    /* you have to edit the startup_stm32fxxx.s file and set a big enough heap size */
+    // you have to edit the startup_stm32fxxx.s file and set a big enough heap size
     UWORD BWImagesize = ((EPD_4IN2_WIDTH % 8 == 0) ? (EPD_4IN2_WIDTH / 8 ) : (EPD_4IN2_WIDTH / 8 + 1)) * EPD_4IN2_HEIGHT;
     if ((BWImage = (UBYTE *)malloc(BWImagesize)) == NULL) {
     printf("Failed to apply for black memory...\r\n");
@@ -34,15 +34,18 @@ void setup()
     Paint_NewImage(BWImage, EPD_4IN2_WIDTH, EPD_4IN2_HEIGHT, 0, WHITE);
 
       
+      
     printf("show image for array\r\n");
     Paint_SelectImage(BWImage);
     Paint_Clear(WHITE);
     Paint_DrawBitMap(gImage_4in2);  //to convert image use: python3 img2array.py -i image.png
     EPD_4IN2_Display(BWImage);
+    
     free(BWImage);
     BWImage=NULL;
 
     DEV_Delay_ms(10000);
+    */
 
 
 
@@ -60,6 +63,11 @@ void setup()
     Paint_NewImage(GSImage, EPD_4IN2_WIDTH, EPD_4IN2_HEIGHT, 0, WHITE);
     Paint_SelectImage(GSImage);
     Paint_SetScale(4);
+
+    Paint_DrawBitMap(gImage_4in2);
+    EPD_4IN2_4GrayDisplay(GSImage);
+
+    DEV_Delay_ms(10000);
     
     
     /*
@@ -90,6 +98,7 @@ void setup()
     Paint_DrawString_CN(220, 120, "微雪电子", &Font24CN, GRAY4, GRAY1);
     */
     
+    /*
     Serial.println("e-Paper Start Lines Test");
     DEV_Delay_ms(1000);
     for (uint16_t i=0;i<100;i++) {
@@ -104,6 +113,7 @@ void setup()
         EPD_4IN2_4GrayDisplay(GSImage);
         DEV_Delay_ms(5000);
     }
+    */
 
     EPD_4IN2_Init_Fast();
     EPD_4IN2_Clear();