mata - 4 months ago 31

Python Question

I read the images using imread and then I would like to compute the average image. How can I add(and divide) using matplotlib?

I'm searching for something like imadd in matlab.

Code:

`img1 = matplotlib.image.imread("path")`

img2 = matplotlib.image.imread("path1")

img3 = matplotlib.image.imread("path2")

Thanks

Answer

You can use the normal sum operations:

```
img4 = img1 + img2 + img3
```

This, however, is not exactly the same as imadd from matlab. Matplotlib works with RGB values from 0 to 1. As so the sum in some pixels will provide values superior to 1 (which for the array type is valid; the same would not be true if the data type were uint8). As so perform the following operation to guarantee that your data comes out correct:

```
img1 = matplotlib.image.imread("path1")
img2 = matplotlib.image.imread("path2")
img3 = np.clip(img1 + img2, 0, 1)
```

Notice that all images must have the same size.