使用 Amazon Rekognition 自动裁剪图像

{ "CelebrityFaces": [ { "Urls": [ "www.wikidata.org/wiki/Q2536951" ], "Name": "Werner Vogels", "Id": "23iZ1oP", "Face": { "BoundingBox": { "Width": 0.10331031680107117, "Height": 0.20054641366004944, "Left": 0.5003396272659302, "Top": 0.07391933351755142 }, "Confidence": 99.99765014648438,
...

{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "s3:GetObject", "s3:PutObject", "s3:DeleteObject", "s3:ListBucket" ], "Resource": [ "arn:aws:s3::: # your-s3-bucket-name " ] } ]
}

{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": "rekognition:RecognizeCelebrities", "Resource": "*" } ]
}

import boto3
from PIL import Image

bucket = '<YOUR_BUCKET_NAME>' file = '<YOUR_FILE_NAME>'
celeb = '<CELEBRITY_NAME>'
aspect_ratio = <ASPECT_RATIO_OF_OUTPUT_IMAGE, e.g. 1 for square>

rek = boto3.client('rekognition')
s3 = boto3.client('s3')

def recognize_celebrity(photo): with open(photo, 'rb') as image: response = rek.recognize_celebrities(Image={'Bytes': image.read()}) image=Image.open(photo) file_type=image.format.lower() path, ext=image.filename.rsplit(".", 1) celeb_faces = response['CelebrityFaces'] print(f'Detected {len(celeb_faces)} faces for {photo}') return celeb_faces, image, path, file_type 

def get_bounding_box(celeb_faces, img_width, img_height, celeb): bbox = None for celebrity in celeb_faces: if celebrity['Name'] == celeb: box = celebrity['Face']['BoundingBox'] left = img_width * box['Left'] top = img_height * box['Top'] width = img_width * box['Width'] height = img_height * box['Height'] print('Left: ' + '{0:.0f}'.format(left)) print('Top: ' + '{0:.0f}'.format(top)) print('Face Width: ' + "{0:.0f}".format(width)) print('Face Height: ' + "{0:.0f}".format(height)) #dimenions of famous face inside the bounding boxes x1=left y1=top x2=left+width y2=top+height bbox = [x1,y1,x2,y2] print(f'Bbox coordinates: {bbox}') if bbox == None: raise ValueError(f"{celeb} not found in results") return bbox

def pad_bbox(bbox, pad_width=0.5, pad_height=0.3): x1, y1, x2, y2 = bbox width = x2 - x1 height = y2 - y1 #dimenions of new image with padding x1= max(x1 - (pad_width * width),0) y1= max(y1 - (pad_height * height),0) x2= max(x2 + (pad_width * width),0) y2= max(y2 + (pad_height * height),0) #dimenions of new image with aspect ratio, 1 is square, 1.5 is 6:4, 0.66 is 4:6 x1= max(x1-(max((y2-y1)*max(aspect_ratio,1)-(x2-x1),0)/2),0) y1= max(y1-(max((x2-x1)*1/(min((aspect_ratio),1))-(y2-y1),0)/2),0) x2= max(x2+(max((y2-y1)*max((aspect_ratio),1)-(x2-x1),0)/2),0) y2= max(y2+(max((x2-x1)*1/(min((aspect_ratio),1))-(y2-y1),0)/2),0) print('x1-coordinate after padding: ' + '{0:.0f}'.format(x1)) print('y1-coordinate after padding: ' + '{0:.0f}'.format(y1)) print('x2-coordinate after padding: ' + "{0:.0f}".format(x2)) print('y2-coordinate after padding: ' + "{0:.0f}".format(y2)) return [x1,y1,x2,y2]

def save_image(roi, image, path, file_type): x1, y1, x2, y2 = roi image = image.crop((x1,y1,x2,y2)) image.save(f'{path}-cropped.{file_type}') s3.upload_file(f'{path}-cropped.{file_type}', bucket, f'{path}-cropped.{file_type}') return image

def main(): # Download S3 image to local s3.download_file(bucket, file, './'+file) #Load photo and recognize celebrity celeb_faces, img, file_name, file_type = recognize_celebrity(file) width, height = img.size #Get bounding box bbox = get_bounding_box(celeb_faces, width, height, celeb) #Get padded bounding box padded_bbox = pad_bbox(bbox) #Save result and display result = save_image(padded_bbox, img, file_name, file_type) display(result) if __name__ == "__main__": main()