I have a masked image, white is the masked area and black is the rest. I want inpaint this area with a different image. Then, i want to mesure the similarity between the example image and the image in the inpaint area. For this area, i only need the image in the white masked area, how can exact only that part or zoom in only that part ?
To extract only the white masked area from your masked image and zoom in on it, you can follow these steps:

1. Load your masked image and the image you want to use for inpainting.

2. Use a bitwise AND operation between the mask and the original image to extract the white masked area:

```python
import cv2

# Load images
masked_image = cv2.imread(masked_image.jpg)
inpaint_image = cv2.imread(inpaint_image.jpg)

# Create mask
mask = cv2.cvtColor(masked_image, cv2.COLOR_BGR2GRAY)
mask = cv2.threshold(mask, 1, 255, cv2.THRESH_BINARY)[1]

# Extract white masked area
masked_area = cv2.bitwise_and(masked_image, masked_image, mask=mask)
```

3. Use OpenCV's resize function to zoom in on the masked area:

```python
zoomed_area = cv2.resize(masked_area, (0,0), fx=2, fy=2, interpolation=cv2.INTER_LINEAR)
```


4.  Use a similarity metric such as mean squared error (MSE) or structural similarity (SSIM) to compare the zoomed masked area with the inpainted image:

```python
# Calculate similarity between zoomed masked area and inpainted image
similarity = cv2.matchTemplate(zoomed_area, inpaint_image, cv2.TM_CCORR_NORMED)
```

The resulting similarity value will give you a measure of how similar the inpainted image is to the white masked area in the original image.