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Replacing the Background of an image?

asked 2019-02-26 04:46:38 -0500

Rounak gravatar image

updated 2019-02-26 08:34:33 -0500

supra56 gravatar image

As I wanted to Remove the background with some specific colors using python. And written some lines of codes but facing with a error. Not getting how it can be resolved?
kindly please check the code i have written:

import cv2
import numpy as np
from matplotlib import pyplot as plt

BLUR = 21
CANNY_THRESH_1 = 10
CANNY_THRESH_2 = 200
MASK_DILATE_ITER = 10
MASK_ERODE_ITER = 10
MASK_COLOR = (255.0, 255.0, 255.0)  # In BGR format
img = cv2.imread("1.jpg")
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray, CANNY_THRESH_1, CANNY_THRESH_2)
edges = cv2.dilate(edges, None)
edges = cv2.erode(edges, None)
contour_info = []
contours: None = cv2.findContours(edges, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE)

for c in contours:
    contour_info.append((
        c,
        cv2.isContourConvex(c),
        cv2.contourArea(c),
    ))
contour_info = sorted(contour_info, key=lambda c: c[2], reverse=True)
max_contours = contour_info[0]
#mask = np.zeros(edges.shape)
#cv2.fillConvexPoly(mask, max_contour[0], (255))
mask = cv2.dilate(mask, None, iterations=MASK_DILATE_ITER)
mask = cv2.erode(mask, None, iterations=MASK_ERODE_ITER)
mask = cv2.GaussianBlur(mask, (BLUR, BLUR), 0)
mask_stack = np.dstack([mask] * 3)  # Create 3-channel alpha mask
mask_stack = mask_stack.astype('float32') / 255.0  # Use float matrices,
img = img.astype('float32') / 255.0  # for easy blending
masked = (mask_stack * img) + ((1 - mask_stack) * MASK_COLOR)  # Blend
masked = (masked * 255).astype('uint8')  # Convert back to 8-bit
plt.imsave('img/1.jpg',masked)
c_red,c_green,c_blue=cv2.split(img)
img_a=cv2.merge((c_red,c_green,c_blue,mask.astype('float32')/255.0))
plt.imshow(img_a)
plt.show()
cv2.imwrite('img/1_1.jpg',img_a*255)
plt.imsave('img/1_2.jpg',img_a)
cv2.imshow('img', masked)  # Display
cv2.waitKey()

The error: File "C:/Users/USER/PycharmProjects/Project/image.py", line 22, in <module> cv2.isContourConvex(c), TypeError: Expected cv::UMat for argument 'contour'

Solving this problem will highly Appreciated.

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Comments

1

try

contours, _ = cv2.findContours(edges, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE)

instead of

contours: None = cv2.findContours(edges, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE)

what does it mean contours: None ?

LBerger gravatar imageLBerger ( 2019-02-26 10:07:43 -0500 )edit

Ohh yes! it started working but gives me error at line 39. which says:File "C:/Users/USER/PycharmProjects/Project/image.py", line 29, in <module> mask = cv2.dilate(mask, None, iterations=MASK_DILATE_ITER) NameError: name 'mask' is not defined

Hope you give a reply to the query. I am thankful to you.

Rounak gravatar imageRounak ( 2019-02-27 00:32:54 -0500 )edit
1

NameError: name 'mask' is not defined

mask is not defined in your program. At what line can I read i "mask = " ?

LBerger gravatar imageLBerger ( 2019-02-27 00:45:41 -0500 )edit

@Rounak. Good catch by @LBerger. Remove comment and see what happen. mask = np.zeros(edges.shape)

supra56 gravatar imagesupra56 ( 2019-02-27 03:53:11 -0500 )edit

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answered 2019-02-26 07:51:07 -0500

supra56 gravatar image

The append is limited one argument not 3.

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Many more thanks for your reply. If you could elaborate the limited argument or the missing one.

I will be Thankful to you. Thanks

Rounak gravatar imageRounak ( 2019-02-26 07:55:56 -0500 )edit

@Rounak. Can you post original image? Btw, I don't used matplotlib.

supra56 gravatar imagesupra56 ( 2019-02-26 08:36:17 -0500 )edit
1

https://banner2.kisspng.com/20180328/...

Hey! you can use this picture. Thanks .

Rounak gravatar imageRounak ( 2019-02-27 00:35:35 -0500 )edit
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Asked: 2019-02-26 04:46:38 -0500

Seen: 337 times

Last updated: Feb 26