add croper

croper.py

@@ -0,0 +1,108 @@
+import PIL
+import numpy as np
+
+from PIL import Image
+
+class Croper:
+    def __init__(
+        self,
+        input_image: PIL.Image,
+        target_mask: np.ndarray,
+        mask_size: int = 256,
+        mask_expansion: int = 20,
+    ):
+        self.input_image = input_image
+        self.target_mask = target_mask
+        self.mask_size = mask_size
+        self.mask_expansion = mask_expansion
+    
+    def corp_mask_image(self):
+        target_mask = self.target_mask
+        input_image = self.input_image
+        mask_expansion = self.mask_expansion
+        original_width, original_height = input_image.size
+        mask_indices = np.where(target_mask)
+        start_y = np.min(mask_indices[0])
+        end_y = np.max(mask_indices[0])
+        start_x = np.min(mask_indices[1])
+        end_x = np.max(mask_indices[1])
+        mask_height = end_y - start_y
+        mask_width = end_x - start_x
+        # choose the max side length
+        max_side_length = max(mask_height, mask_width)
+        # expand the mask area
+        height_diff = (max_side_length - mask_height) // 2
+        width_diff = (max_side_length - mask_width) // 2
+        start_y = start_y - mask_expansion - height_diff
+        if start_y < 0:
+            start_y = 0
+        end_y = end_y + mask_expansion + height_diff
+        if end_y > original_height:
+            end_y = original_height
+        start_x = start_x - mask_expansion - width_diff
+        if start_x < 0:
+            start_x = 0
+        end_x = end_x + mask_expansion + width_diff
+        if end_x > original_width:
+            end_x = original_width
+        expanded_height = end_y - start_y
+        expanded_width = end_x - start_x
+        expanded_max_side_length = max(expanded_height, expanded_width)
+        # calculate the crop area
+        crop_mask = target_mask[start_y:end_y, start_x:end_x]
+        crop_mask_start_y = (expanded_max_side_length - expanded_height) // 2
+        crop_mask_end_y = crop_mask_start_y + expanded_height
+        crop_mask_start_x = (expanded_max_side_length - expanded_width) // 2
+        crop_mask_end_x = crop_mask_start_x + expanded_width
+        # create a square mask
+        square_mask = np.zeros((expanded_max_side_length, expanded_max_side_length), dtype=target_mask.dtype)
+        square_mask[crop_mask_start_y:crop_mask_end_y, crop_mask_start_x:crop_mask_end_x] = crop_mask
+        square_mask_image = Image.fromarray((square_mask * 255).astype(np.uint8))
+
+        crop_image = input_image.crop((start_x, start_y, end_x, end_y))
+        square_image = Image.new("RGB", (expanded_max_side_length, expanded_max_side_length))
+        square_image.paste(crop_image, (crop_mask_start_x, crop_mask_start_y))
+
+        self.origin_start_x = start_x
+        self.origin_start_y = start_y
+        self.origin_end_x = end_x
+        self.origin_end_y = end_y
+
+        self.square_start_x = crop_mask_start_x
+        self.square_start_y = crop_mask_start_y
+        self.square_end_x = crop_mask_end_x
+        self.square_end_y = crop_mask_end_y
+
+        self.square_length = expanded_max_side_length
+        self.square_mask_image = square_mask_image
+        self.square_image = square_image
+        self.corp_mask = crop_mask
+
+        mask_size = self.mask_size
+        self.resized_square_mask_image = square_mask_image.resize((mask_size, mask_size))
+        self.resized_square_image = square_image.resize((mask_size, mask_size))
+
+        return self.resized_square_mask_image
+    
+    def restore_result(self, generated_image):
+        square_length = self.square_length
+        generated_image = generated_image.resize((square_length, square_length))
+        square_mask_image = self.square_mask_image
+        cropped_generated_image = generated_image.crop((self.square_start_x, self.square_start_y, self.square_end_x, self.square_end_y))
+        cropped_square_mask_image = square_mask_image.crop((self.square_start_x, self.square_start_y, self.square_end_x, self.square_end_y))
+
+        restored_image = self.input_image.copy()
+        restored_image.paste(cropped_generated_image, (self.origin_start_x, self.origin_start_y), cropped_square_mask_image)
+        
+        return restored_image
+    
+    def restore_result_v2(self, generated_image):
+        square_length = self.square_length
+        generated_image = generated_image.resize((square_length, square_length))
+        cropped_generated_image = generated_image.crop((self.square_start_x, self.square_start_y, self.square_end_x, self.square_end_y))
+
+        restored_image = self.input_image.copy()
+        restored_image.paste(cropped_generated_image, (self.origin_start_x, self.origin_start_y))
+        
+        return restored_image
+