# 代碼來自 https://blog.csdn.net/hello_dear_you/article/details/120130155
import json
import numpy as np
import cv2
# read json file
with open("origin_json/mypic.json", "r") as f:
    data = f.read()
 
# convert str to json objs
data = json.loads(data)
 
# get the points 
points = data["shapes"][0]["points"]
points = np.array(points, dtype=np.int32)   # tips: points location must be int32
 
# read image to get shape
image = cv2.imread("origin_png/person.jpg")
 
# create a blank image
mask = np.zeros_like(image, dtype=np.uint8)
 
# fill the contour with 255
cv2.fillPoly(mask, [points], (255, 255, 255))
 
# save the mask 
cv2.imwrite("mask/person_mask.png", mask)

# 參考自: https://www.jianshu.com/p/1961aa0c02ee
import cv2
import numpy as np
origin_png = 'origin_png/person.jpg'
# maskPath = 'mask/person_mask.png'
maskPath = 'mask/bmv2.png'
result_png = 'result_png/result_png.png'
maskImg = cv2.imread(maskPath)
img = cv2.imread(origin_png)
assert maskImg.shape == img.shape, 'maskImg.shape != origin_png.shape'

h, w = img.shape[0], img.shape[1]
print('圖片寬度: {}, 高度: {}'.format(h, w))

rgb = (19,122,171)
bgr = (rgb[2], rgb[1], rgb[0])
# (B, G, R)
for i in range(h):
    for j in range(w):
        if (maskImg[i, j] == 0).all():
            img[i, j] = bgr
cv2.imwrite(result_png, img)
print('圖片寫入 {} 成功'.format(result_png))

import cv2
import numpy as np
def mean_square_loss(a_np, b_np):
    sl = np.square(a_np - b_np)
    return np.mean(sl)
def change_red2blue(origin_png, result_png):
    img = cv2.imread(origin_png)
    h, w = img.shape[0], img.shape[1]
    print('圖片寬度: {}, 高度: {}'.format(h, w))
    origin_rgb = (168,36,32)  # 可以用瀏覽器啥的控制臺工具提取出背景的rgb值
    origin_bgr = (origin_rgb[2], origin_rgb[1], origin_rgb[0])
    target_rgb = (19,122,171) # 藍底RBG
    target_bgr = (target_rgb[2], target_rgb[1], target_rgb[0])
    for i in range(h):
        for j in range(w):
            # (B, G, R)
            if mean_square_loss(img[i, j], origin_bgr) < 50:
                img[i, j] = target_bgr 
    cv2.imwrite(result_png, img)
    print('圖片寫入 {} 成功'.format(result_png))
if __name__ == '__main__':
    # origin_png = 'result_png/result_png.png'
    origin_png = 'origin_png/person.jpg'
    result_png = 'result_png/result_refine.png'
    change_red2blue(origin_png, result_png)

from torchvision.transforms.functional import to_tensor, to_pil_image
from PIL import Image
import torch
import time
def mean_square_loss(a_ts, b_ts):
    # print(a_ts.shape)
    # print(b_ts)
    sl = (a_ts - b_ts) ** 2
    return sl.sum()
def change_red2blue(origin_png, result_png):
    src = Image.open(origin_png)
    src = to_tensor(src)
    # print(src.shape)  # torch.Size([3, 800, 600])
    # channel: (R, G, B) / 255
    h, w = src.shape[1], src.shape[2]

    pha = torch.ones(h, w, 3)

    bg = torch.tensor([168,36,32]) / 255
    target_bg = torch.tensor([19,122,171]) / 255

    # C, H, W -> H, W, C
    src = src.permute(1, 2, 0)
    for i in range(h):
        for j in range(w):
            if mean_square_loss(src[i][j], bg) < 0.025: # 0.025是閾值，超參數(shù)
                pha[i][j] = torch.tensor([0.0, 0.0, 0.0])

    # H, W, C -> C, H, W
    src = src.permute(2, 0, 1)
    pha = pha.permute(2, 0, 1)
    com = pha * src + (1 - pha) * target_bg.view(3, 1, 1)
    to_pil_image(com).save(result_png)
if __name__ == '__main__':
    origin_png = 'origin_png/person.jpg'
    result_png = 'result_png/com.png'
    start_time = time.time()
    change_red2blue(origin_png, result_png)
    spend_time = round(time.time() - start_time, 2)
    print('生成成功，共花了 {} 秒'.format(spend_time))

import cv2
import numpy as np
image = cv2.imread("origin_png/person.jpg")
origin_rgb = (168,36,32)  # 可以用瀏覽器啥的控制臺工具提取出背景的rgb值
origin_bgr = (origin_rgb[2], origin_rgb[1], origin_rgb[0])
image[:, :] = origin_bgr
cv2.imwrite("mask/bg.png", image)

src = Image.open('src.png')
bgr = Image.open('bgr.png')

com = pha * fgr + (1 - pha) * torch.tensor([120/255, 255/255, 155/255], device='cuda').view(1, 3, 1, 1)

com = pha * fgr + (1 - pha) * torch.tensor([255/255, 255/255, 255/255], device='cuda').view(1, 3, 1, 1)

com = pha * fgr + (1 - pha) * torch.tensor([19/255, 122/255, 171/255], device='cuda').view(1, 3, 1, 1)