在 Kivy 中显示 numpy/opencv/matplotlib 图像

2022-01-15 00:00:00 python opencv kivy

问题描述

如何在 Kivy 中以标准 numpy/opencv/matplotlib 格式显示图像?Kivy 使用不同的图像内存布局，我不知道是哪一个.

How to display image in standard numpy/opencv/matplotlib format in Kivy? Kivy uses different image memory layout and I can't figure out which one.

以下代码完全正常.使用 cv2 VideoCapture 捕获图像.我认为图像是 BGR，数组维度是 (360, 480, 3):

The following code works totally fine. Image was captured using cv2 VideoCapture. I think image is BGR, array dimensions are (360, 480, 3):

    ret, image = video_capture.read()
    cv2.imshow('image', image)
    cv2.waitKey()

尝试使用以下代码显示它会产生混乱的结果:

Trying to display it with the following code produce messy results:

    video_texture = Texture.create(size=image.shape[:2])
    video_texture.blit_buffer(image.tostring(), colorfmt='rgb', bufferfmt='ubyte')

    # ...

    video_panel = self.ids['video_panel']
    with video_panel.canvas:
        Rectangle(texture=video_texture, pos=video_panel.pos, size=video_panel.size)

解决方案

找到了正确的转换.可能不是最理想的:

Found the right transformation. Probably suboptimal:

    ret, image = video_capture.read()
    image = np.rot90(np.swapaxes(image, 0, 1))
    video_texture = Texture.create(size=(image.shape[1], image.shape[0]), colorfmt='rgb')
    video_texture.blit_buffer(image.tostring(), colorfmt='bgr', bufferfmt='ubyte')

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