added detector.py

detector.py

@@ -0,0 +1,92 @@
+import cv2 as cv
+import numpy as np
+from fastai.vision.all import *
+import pathlib
+
+def chop_img(img, step):
+    allImgs = []
+    width, height, i, j = 640, 512, 0, 0
+    for i in range(step):
+        for j in range(step):
+            # crop the image into step*rows and step*columns
+            imgCrop = img[int(0 + height / step * i): int(height / step + height / step * i),
+                      int(0 + width / step * j): int(width / step + width / step * j)]
+            imgResize = cv.resize(imgCrop, (640, 512))  # Resize image
+            imgAug = augment(imgResize)
+            allImgs.append((imgResize, imgAug))
+            j += 1
+        i += 1
+    return allImgs
+
+def augment(img):
+    kernel = np.ones((5, 5), np.uint8)
+    imgGray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)  # convert to grayscale
+    imgBlur = cv.GaussianBlur(imgGray, (5, 5), 0)  # apply gaussian blur
+    imgThresh = cv.adaptiveThreshold(  # apply adaptive threshold
+    imgBlur, 255, cv.ADAPTIVE_THRESH_GAUSSIAN_C, cv.THRESH_BINARY_INV, 7, 5)
+    imgDilation = cv.dilate(imgThresh, kernel, iterations=1)  # apply dilation to amplify threshold result
+    return imgDilation
+    
+def crop_bat(img, box):
+    x1, y1, x2, y2, x3, y3, x4, y4 = int(box[0][1]), int(box[0][0]), int(box[1][1]), int(box[1][0]), int(box[2][1]), int(box[2][0]), int(box[3][1]), int(box[3][0])
+
+    # Find distance from cx to top_left_x and cy to top_left_y to determine how many pixels the border around the cropped image should be
+    top_left_x, top_left_y, bot_right_x, bot_right_y = min([x1,x2,x3,x4]), min([y1,y2,y3,y4]), max([x1,x2,x3,x4]), max([y1,y2,y3,y4])
+
+    crop_x1 = top_left_x - 10 
+    if crop_x1 <= 0:
+        crop_x1 = 1 
+    
+    crop_x2 = bot_right_x+11
+    if crop_x2 > 512:
+        crop_x2 = 512 
+
+    crop_y1 = top_left_y-10
+    if crop_y1 <= 0:
+        crop_y1 = 1
+
+    crop_y2 = bot_right_y+11
+    if crop_y2 > 640:
+        crop_y2 = 640 
+    
+    bat_crop = img[crop_x1: crop_x2, crop_y1: crop_y2]
+
+    return bat_crop
+    
+def find_bats(allImgs):
+    batDepthMin, batDepthMax = 50, 400
+    cropped_bats = []
+
+    for img in allImgs:
+        blobs = cv.findContours(img[1], cv.RETR_LIST, cv.CHAIN_APPROX_SIMPLE)[-2]
+        # Process the blobs
+        for blob in blobs:
+            if batDepthMin < cv.contourArea(blob) < batDepthMax:  # Only process blobs with a min / max size 
+                rect = cv.minAreaRect(blob)
+                box = cv.boxPoints(rect)
+                box = np.int0(box)
+                cropped_bat = crop_bat(img[0], box)
+                cropped_bats.append(cropped_bat)
+                        
+    return cropped_bats
+
+def bat_detector(img):
+    img = cv.resize(img, (640,512))
+    totalBats = 0
+
+    allImgs = chop_img(img, 3)
+
+    cropped_bats = find_bats(allImgs)
+
+    temp = pathlib.PosixPath
+    pathlib.PosixPath = pathlib.WindowsPath
+    learn = load_learner("model.pkl")
+
+    for bat in cropped_bats:
+        label, _, probs = learn.predict(bat)
+        p=f"{probs[0]:.4f}"
+        if label == '!bat' and p > '0.5':
+            pass
+        else:
+            totalBats += 1
+    return totalBats