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import numpy as np | ||
import cv2 | ||
from PIL import Image | ||
import os | ||
import json | ||
from shapely.geometry import Polygon, MultiPolygon | ||
from skimage.draw import polygon | ||
from skimage.morphology import erosion, square, binary_erosion | ||
from skimage.io import imread,imsave | ||
from utils import colorize,create_path | ||
from tqdm import tqdm | ||
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import rasterio as rs | ||
from cv2 import fillPoly,copyMakeBorder | ||
from math import ceil | ||
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class Masker(): | ||
def __init__(self, | ||
data, | ||
out_size = (1024,1024), | ||
erosion_kernel ='cross', | ||
iterator_verbose = True): | ||
self.sz = out_size | ||
self.pd_sz = (1044,1044) | ||
self.x_off = ceil((self.pd_sz[1] - self.sz[1])/2) | ||
self.y_off = ceil((self.pd_sz[0] - self.sz[0])/2) | ||
assert self.x_off >= 0 and self.y_off >= 0, f'out size {self.sz} should be less than padded size {self.pd_sz}' | ||
assert erosion_kernel.lower() in ['square','cross'], f'erosion kernel type : [ {erosion_kernel} ] is not valid' | ||
self.ek_type = erosion_kernel.lower() | ||
self.itr_vrbs = iterator_verbose ### | ||
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self.data = data | ||
self.ids = sorted(os.listdir(self.data)) | ||
self.ldir = 'labels_match_pix' | ||
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def load_labels(self,json_path): | ||
jfile=open(json_path,'r') | ||
f=json.load(jfile) | ||
return f | ||
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def poly_size(self,w,h): | ||
return Polygon([[0,0],[w-1,0],[w-1,h-1],[0,h-1],[0,0]]) | ||
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def get_strc(self): | ||
if(self.ek_type == 'square'): | ||
return square(3) | ||
else: | ||
return np.array([[0,1,0], | ||
[1,1,1], | ||
[0,1,0]],dtype=np.uint8) | ||
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def load_raster_file(self,raster_path): | ||
return rs.open(raster_path) | ||
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def get_img(self,raster_file): | ||
return raster_file.read().transpose(1,2,0).astype(np.uint8) | ||
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def project_poly(self,poly,frs,size,x_off= 0,y_off=0): | ||
k = [] | ||
for tup in poly: | ||
_x,_y = frs.index(*tup) | ||
_x+=x_off | ||
_y+=y_off | ||
k.append([_x,_y]) | ||
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polk= Polygon(k) | ||
if(not polk.is_valid): | ||
polk = polk.buffer(0.01) | ||
poll = self.poly_size(*size) | ||
intr = poll.intersection(polk) | ||
verbs = intr.geom_type == 'Polygon' | ||
return list(intr.exterior.coords) if(verbs) else [] | ||
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def crop(self,img,y_off,x_off,h,w): | ||
return img[y_off:y_off + h,x_off:x_off + w] | ||
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def make_mask(self,polys, size = (1024,1024)): | ||
builds,border = [np.zeros(size,dtype=np.uint8),np.zeros(size,dtype=np.uint8)] | ||
instances = np.zeros(size,dtype=np.int32) | ||
strc = self.get_strc() | ||
itr = enumerate(polys) | ||
if(self.itr_vrbs): | ||
itr = tqdm(itr) | ||
itr.set_description('generating mask') | ||
for i,mulpol in itr: | ||
for j,pol in enumerate(mulpol): | ||
arr_pol= np.array(pol,dtype=np.int32) | ||
hs,ws = polygon(arr_pol[:,0],arr_pol[:,1],size) | ||
instances[hs,ws,...] = np.int32(i+1) if(j==0) else 0 | ||
#fillPoly(instances, [arr_pol[:,::-1]], i+1 if(j == 0) else 0) | ||
instance = instances == np.int32(i+1) | ||
try: | ||
k=np.where(instance>0) | ||
_t = k[0].min() - 2 | ||
_l = k[1].min() - 2 | ||
_b = k[0].max() + 2 | ||
_r = k[1].max() + 2 | ||
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crop_instance = instance[_t:_b,_l:_r] | ||
bld = binary_erosion(crop_instance,selem = strc) | ||
brdr = bld ^ crop_instance | ||
brdr1 = np.zeros_like(instance,dtype=brdr.dtype) | ||
brdr1[_t:_b,_l:_r] =brdr | ||
border[brdr1 == True] = np.uint8(255) | ||
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except: | ||
bld = binary_erosion(instance,selem = strc) | ||
brdr = bld ^ instance | ||
border[brdr == True] = np.uint8(255) | ||
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builds[instances > 0] = np.uint8(255) | ||
return instances,builds,border | ||
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def mask(self,raster_path,json_path): | ||
raster = self.load_raster_file(raster_path) | ||
img = self.get_img(raster) | ||
js = self.load_labels(json_path) | ||
labels = js['features'] | ||
polys =[] | ||
for label in labels: | ||
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multipoly = label['geometry']['coordinates'] | ||
proj_multipoly = [] | ||
for poly in multipoly: | ||
mm = self.project_poly(poly, raster,self.pd_sz,self.x_off,self.y_off) | ||
if(len(mm)>0): | ||
proj_multipoly.append(mm) | ||
polys.append(proj_multipoly) | ||
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ins,b,br = self.make_mask(polys,size = self.pd_sz) | ||
kwargs = {'y_off' : self.y_off, | ||
'x_off' : self.x_off, | ||
'h' : self.sz[0], | ||
'w' : self.sz[1]} | ||
ins = self.crop(ins,**kwargs) | ||
b = self.crop(b,**kwargs) | ||
br = self.crop(br,**kwargs) | ||
img = cv2.copyMakeBorder(img, | ||
top=0, | ||
bottom = self.sz[0] - img.shape[0], | ||
left=0, | ||
right = self.sz[1] - img.shape[1], | ||
borderType =cv2.BORDER_CONSTANT, | ||
value = 0) | ||
return img,ins,b,br | ||
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def _collect(self,labels): | ||
_meta = {} | ||
for label in labels['features']: | ||
pid = str(np.int32(label['properties']['Id'])) | ||
_meta[pid] = {} | ||
_meta[pid]['area']= label['properties']['area'] | ||
_meta[pid]['geometry'] = label['geometry']['coordinates'] | ||
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def int_coords(self,x): | ||
return np.array(x).round().astype(np.int32) | ||
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def instances(self,size,labels): | ||
ins_mask = np.zeros(size,dtype = np.int32) | ||
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for pid,d in labels.items(): | ||
int_id = np.int32(pid) | ||
polys = d['geometry'] | ||
for i,poly in enumerate(polys): | ||
poly.append(poly[0]) | ||
S = Polygon(poly) | ||
PS = self.poly_size(size[1],size[0]) | ||
S = S.intersection(PS) | ||
Stype = S.geom_type | ||
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if(Stype == 'Polygon'): | ||
arr_pol = self.int_coords(S.exterior.coords) | ||
if(len(arr_pol.shape) != 2): continue | ||
ws,hs = polygon(arr_pol[:,0],arr_pol[:,1],size) | ||
ins_mask[hs,ws,...] = int_id if(i==0) else 0 | ||
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elif(Stype == 'MultiPolygon'): | ||
for s in S: | ||
arr_pol = self.int_coords(s.exterior.coords) | ||
if(len(arr_pol.shape) != 2): continue | ||
ws,hs = polygon(arr_pol[:,0],arr_pol[:,1],size) | ||
ins_mask[hs,ws,...] = int_id if(i==0) else 0 | ||
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else: | ||
for point in list(S.coords): | ||
x,y = list(map(np.int32,point)) | ||
ins_mask[y,x,...] = int_id if(i==0) else 0 | ||
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return ins_mask | ||
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def borders(self,ins_mask): | ||
ins_borders = np.zeros_like(ins_mask,dtype = np.int32) | ||
ids = sorted(np.unique(ins_mask))[1:] | ||
strc = self.get_strc() | ||
for iid in ids: | ||
instance = ins_mask == iid | ||
try: | ||
k=np.where(instance>0) | ||
_t = k[0].min() - 3 | ||
_l = k[1].min() - 3 | ||
_b = k[0].max() + 3 | ||
_r = k[1].max() + 3 | ||
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crop_instance = instance[_t:_b,_l:_r] | ||
bld = binary_erosion(crop_instance,selem = strc) | ||
brdr = bld ^ crop_instance | ||
brdr1 = np.zeros_like(instance,dtype=brdr.dtype) | ||
brdr1[_t:_b,_l:_r] =brdr | ||
ins_borders[brdr1 == True] = iid | ||
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except: | ||
bld = binary_erosion(instance,selem = strc) | ||
brdr = bld ^ instance | ||
ins_borders[brdr == True] = iid | ||
return ins_borders | ||
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def to_rgb(self,img): | ||
rgb = np.ascontiguousarray(img[...,:3],dtype = np.uint8) | ||
return rgb | ||
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def to_gray(self,mask): | ||
return (mask>0).astype(np.uint8) * 255 | ||
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def generate_dataset(self,save_path): | ||
create_path(save_path) | ||
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for iid in self.ids[42:]: | ||
imgs_save = f'{save_path}/{iid}' | ||
imgs_path = f'{self.data}/{iid}/images_masked' | ||
labels_path = f'{self.data}/{iid}/{self.ldir}' | ||
lod = os.listdir(imgs_path) | ||
loader = tqdm(lod) if(itr_vrbs) else lod | ||
loader.set_description(f'{iid}') | ||
create_path(imgs_save) | ||
for exten in loader: | ||
e = exten.split('.tif')[0] | ||
img_save = f'{imgs_save}/{e}' | ||
create_path(img_save) | ||
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img_rgba = imread(f'{imgs_path}/{e}.tif') | ||
img_rgb = self.to_rgb(img_rgba) | ||
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lf = self.load_labels(iid, e) | ||
labels = self._collect(lf) | ||
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size = img_rgb.shape[:2] | ||
ins_mask = self.instances(size, labels) | ||
ins_borders = self.borders(ins_mask) | ||
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imsave(f'{img_save}/image.png',img_rgb) | ||
imsave(f'{img_save}/buildings.png',self.to_gray(ins_mask)) | ||
imsave(f'{img_save}/borders.png',self.to_gray(ins_borders)) | ||
np.save(f'{img_save}/buildings.npy',ins_mask) | ||
np.save(f'{img_save}/borders.npy',ins_borders) | ||
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# class masker(): | ||
# def __init__(self,data, | ||
# out_size = (1024,1024), | ||
# erosion_kernel ='cross', | ||
# verbose = True): | ||
# self.data = data | ||
# self.sz = out_size | ||
# self.ids = sorted(os.listdir(self.data)) | ||
# self.ldir = 'labels_match_pix' | ||
# assert erosion_kernel in ['cross','square'] | ||
# self.ek_type = erosion_kernel | ||
# itr_vrbs = verbose | ||
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