python - 在python中堆叠图像时出现ValueError

Question

我正在尝试聚焦堆叠多张图像，但我不断收到以下错误消息。为什么我会收到此错误以及我应该如何解决它？

如有任何关于如何解决此问题的建议和代码片段，我们将不胜感激。

我看过this post但我仍然不确定这个错误在我的场景中的含义。

File "/Users/...", line 32, in stack maximum = abs_laps.max(axis=0)

File "/anaconda3/lib/python3.5/site-packages/numpy/core/_methods.py", line 26, in _amax return umr_maximum(a, axis, None, out, keepdims)

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

上面错误中指出的堆栈方法在下面提供，堆栈器方法也是如此。

def stacker(folder, num):
    images = []
    for filename in os.listdir(folder):
        img = cv2.imread(os.path.join(folder,filename))
        if img is not None:
            images.append(img)
    stacked = stack(images)
    newpath = "key-frames" #destination of final image
    os.chdir(newpath)
    cv2.imwrite("Stacked%d.png" % num, stacked)

堆栈方法如下

def stack(imgs):
    #aligns the images
    images = imageAlignment(imgs)
    laps = []

    #loop through images and compute lap
    for i in range(len(images)):
        grayImg = cv2.cvtColor(images[i],cv2.COLOR_BGR2GRAY)
        laps.append(findLap(grayImg))

    #converts input to array
    laps = np.asarray(laps)

    #creates empty array
    output = np.zeros(shape=images[0].shape, dtype=images[0].dtype)

    #find absolute value of laps
    abs_laps = np.absolute(laps)

    #find maximum of laps
    maximum = abs_laps.max(axis=0)

    #boolean to determine if lap for image is max
    booleanChecker = abs_laps == maximum

    #pixels are unit8 and uint8 will wrap
    mask = booleanChecker.astype(np.uint8)

    #inverts every bit of array using mask that specifies of output array 
    #to be changed
    for i in range(0,len(images)):
        output = cv2.bitwise_not(images[i],output, mask=mask[i])

    return 255 - output

编辑

下面是 abs_laps 的构成示例。

[0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 0.000e+00 >0.000e+00 0.000e+00 0.000e+00 2.000e+00 1.600e+01 6.400e+01 1.800e+02 >3.800e+02]

Answer 1

您输入的数据有误。您应该打印出代码在哪个图像上中断并检查数据。您很可能在要堆叠的图像集中有一个空图像。