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import cv2 as cv | |
import numpy as np | |
from fastai.vision.all import * | |
import time | |
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] | |
cropped_bats.extend([crop_bat(img[0], np.int0(cv.boxPoints(cv.minAreaRect(blob)))) for blob in blobs if batDepthMin < cv.contourArea(blob) < batDepthMax]) | |
return cropped_bats | |
def bat_detector(img): | |
start=time.time() | |
allImgs = chop_img(img, 3) | |
cropped_bats = find_bats(allImgs) | |
learn = load_learner("model.pkl") | |
def predict(bat): | |
with learn.no_bar(), learn.no_logging(): | |
_, _, probs = learn.predict(bat) | |
return (tuple(map(lambda x: f"{x:.4f}", probs))) | |
results = [predict(bat) for bat in cropped_bats] | |
filtered_results = filter(lambda x: (x[0] < '0.5' and x[1] > '0.75'), results) | |
return len(list(filtered_results)), (time.time()-start) |