有没有办法将 numpy 数组指定为“Image Widget”？

Question

我正在寻找一种方法来将 numpy 图像数组 指定为 Image 小部件的 source，而无需保存为“.png”或“.jpg”等文件。 我知道一种使用画布的方法（Texture.create()，blit_buffer()，Rectangle()）.....还有其他方法吗？

import kivy
from kivy.app import App
from kivy.uix.image import Image
from kivy.uix.widget import Widget
import cv2

class Test(Widget):

    img = cv2.imread('0.png', cv2.IMREAD_UNCHANGED)
    img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
    img = cv2.flip(img, 0)

    # Is it possible to specify cv2(numpy) image to 'Image Widget' directly(without saving as file(jpg,png))?
    w_img = Image(source=img, size=(100, 100)) # >> error
    self.add_widget(w_img)

class DemoApp(App):
    def build(self):
        return Test()

if __name__ == '__main__':
    DemoApp().run()

Answer 1

您必须通过Texture 传递图像：

import kivy
from kivy.app import App
from kivy.uix.image import Image
from kivy.uix.widget import Widget
from kivy.graphics.texture import Texture
import cv2

class Test(Widget):
    def __init__(self, **kwargs):
        super(Test, self).__init__(**kwargs)

        img = cv2.imread('0.png', cv2.IMREAD_UNCHANGED)
        img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
        img = cv2.flip(img, 0)
        w, h, _ = img.shape
        texture = Texture.create(size=(w, h))
        texture.blit_buffer(img.flatten(), colorfmt='rgb', bufferfmt='ubyte')

        w_img = Image(size=(w, h), texture=texture)
        self.add_widget(w_img)

class DemoApp(App):
    def build(self):
        return Test()

if __name__ == '__main__':
    DemoApp().run()