From f0565b8e95f91f7fffc6717545ed042e8d280f33 Mon Sep 17 00:00:00 2001
From: 0x01FE <jacksondhodge@gmail.com>
Date: Fri, 6 Sep 2024 14:50:56 -0500
Subject: [PATCH] idk

---
 sobel.py | 138 +++++++++++++++++++++++++++++++++----------------------
 1 file changed, 82 insertions(+), 56 deletions(-)

diff --git a/sobel.py b/sobel.py
index 180d3fa..f682cd2 100644
--- a/sobel.py
+++ b/sobel.py
@@ -1,30 +1,28 @@
-import scipy.ndimage as nd
-import imageio.v3 as iio
+# import scipy.ndimage as nd
+# import imageio.v3 as iio
 import numpy as np
 import math
 from PIL import Image, ImageFilter
 
-IMAGE_PATH = 'engine.png'
+IMAGE_PATH = 'sample-images/engine.PNG'
 
 BLUR_STRENGTH_1 = 1
 BLUR_STRENGTH_2 = 3
 
 DOG_THRESHOLD = 8
 
-sobel_x_kernel = ImageFilter.Kernel((3, 3),
-                                    (
-                                        1, 0, -1,
-                                        2, 0, -2,
-                                        1, 0, -1
-                                    ))
-
-sobel_y_kernel = ImageFilter.Kernel((3, 3),
-                                    (
-                                        1, 2, 1,
-                                        0, 0, 0,
-                                        -1, -2, -1
-                                    ))
-
+CHARS = [
+    ' ',
+    '.',
+    '_',
+    '+',
+    '=',
+    'A',
+    'K',
+    'B',
+    '&',
+    '#'
+]
 
 def main():
 
@@ -35,13 +33,29 @@ def main():
     blur_1 = image.filter(ImageFilter.GaussianBlur(BLUR_STRENGTH_1))
     blur_2 = image.filter(ImageFilter.GaussianBlur(BLUR_STRENGTH_2))
 
+
+    print(image.size)
     dog: Image = difference_of_gaussians(blur_1, blur_2)
 
-    sb = sobel(image)
+    print(dog.size)
 
-    sb.save('sobel-pil.png')
+    # sb = sobel(image)
 
-    sb = sobel(dog)
+    # sb.save('sobel-pil.png')
+
+    sb, gradient = sobel(dog)
+
+    w, h = sb.size
+
+    print(w * h)
+    print(sb.size)
+    print(len(gradient))
+    exit()
+
+    for y in range(0, h):
+        for x in range(0, w):
+            gradient_v = gradient[y * (w - 1) + x]
+            print(match_gradient(gradient_v))
 
     sb.save('sobel-dog.png')
 
@@ -101,22 +115,23 @@ def difference_of_gaussians(blur_1: Image, blur_2: Image) -> Image:
 
 # Taken from
 # https://enzoftware.github.io/posts/image-filter-python
-def sobel(img: Image) -> Image:
+def sobel(img: Image) -> tuple[Image.Image, list]:
+    if img.mode == 'L':
+        return sobel_L(img)
+
     width, height = img.size
 
     newimg = Image.new("RGB", (width, height), "white")
-    for x in range(1, width-1):  # ignore the edge pixels for simplicity (1 to width-1)
-        for y in range(1, height-1): # ignore edge pixels for simplicity (1 to height-1)
+    gradient = []
+    for x in range(1, width - 1):  # ignore the edge pixels for simplicity (1 to width-1)
+        for y in range(1, height - 1): # ignore edge pixels for simplicity (1 to height-1)
 
             # initialise Gx to 0 and Gy to 0 for every pixel
             Gx = 0
             Gy = 0
 
             # top left pixel
-            p = img.getpixel((x-1, y-1))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x - 1, y - 1))
 
             # intensity ranges from 0 to 765 (255 * 3)
             intensity = r + g + b
@@ -126,56 +141,35 @@ def sobel(img: Image) -> Image:
             Gy += -intensity
 
             # remaining left column
-            p = img.getpixel((x-1, y))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x-1, y))
 
             Gx += -2 * (r + g + b)
 
-            p = img.getpixel((x-1, y+1))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x-1, y+1))
 
             Gx += -(r + g + b)
             Gy += (r + g + b)
 
             # middle pixels
-            p = img.getpixel((x, y-1))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x, y-1))
 
             Gy += -2 * (r + g + b)
 
-            p = img.getpixel((x, y+1))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x, y+1))
 
             Gy += 2 * (r + g + b)
 
             # right column
-            p = img.getpixel((x+1, y-1))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x+1, y-1))
 
             Gx += (r + g + b)
             Gy += -(r + g + b)
 
-            p = img.getpixel((x+1, y))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x+1, y))
 
             Gx += 2 * (r + g + b)
 
-            p = img.getpixel((x+1, y+1))
-            r = p[0]
-            g = p[1]
-            b = p[2]
+            r, g, b = img.getpixel((x+1, y+1))
 
             Gx += (r + g + b)
             Gy += (r + g + b)
@@ -187,12 +181,44 @@ def sobel(img: Image) -> Image:
             length = length / 4328 * 255
 
             length = int(length)
+            gradient_v = math.atan2(Gy, Gx)
+            # print(gradient_v)
 
             # draw the length in the edge image
             #newpixel = img.putpixel((length,length,length))
             newimg.putpixel((x,y),(length,length,length))
+            gradient.append(gradient_v)
+
+    return (newimg, gradient)
+
+def sobel_L(img: Image) -> tuple[Image.Image, list]:
+    pass
+
+# TODO @0x01FE : refactor plz increment by 30 & 60
+def match_gradient(n: float) -> str:
+
+    n = abs(n)
+
+    if n < math.radians(30):
+        return '-'
+    elif n < math.radians(60):
+        return '/'
+    elif n < math.radians(120):
+        return '|'
+    elif n < math.radians(150):
+        return '\\'
+    elif n < math.radians(210):
+        return '-'
+    elif n < math.radians(240):
+        return '/'
+    elif n < math.radians(300):
+        return '|'
+    elif n < math.radians(330):
+        return '\\'
+    else:
+        return '-'
+
 
-    return newimg
 
 if __name__ == '__main__':
     main()