Opencv Image on Kivy Image() Widget

[Mateus Michels]

Hello, that's my first post, before you think "Alrealy exist a post with that topic" sorry, i din't find that.

Thats my problem, i'm trying to put a image processed on yolo with opencv, this image is a instance of a cv2.imread, i have found many examples with camera but dosen't work for me.

The idea is to get a image file on the computer and show it on a Image() widget, after that, the program send exactly the same image to a darknet (yolo) object detection, after the detection, this image will be saved on the same variable of the input, and so, the program must to take that image (remains a cv2.imread return) and show the result on the same Image() widget.

But it is resulting in a black screen...

Based on a kivy opencv camera example i reach on that code:

class Imagem(Image):
    def build(self):
        return Image()

    def atualizaImagem(self, img):
        imagem = img  # cv2.imread image
        buf1 = cv2.flip(imagem, 0)
        buf = buf1.tostring()
        texture1 = Texture.create(size=(imagem.shape[1], imagem.shape[0]), colorfmt='bgr')
        texture1.blit_buffer(buf, colorfmt='bgr', bufferfmt='ubyte')
        self.texture = texture1  # ends with a black image.

this object is what i use to build and manipulate a Image() widget. on another aplication that works, but in this no... (On another code is a simple Image() and Button(), when button is pressed the 'atualizarImage()' is runned.)

Maybe the problem is in a Image() widget be inside another boxLayout()?

full code: https://github.com/MMichels/Yolzure-AnaliseDeImagens/tree/master/src/tela

[Mateus Michels]

ATT: Reading the Logs file i found that: Shader: GL error 1282, it appers after that line be runned: "texture1 = Texture.create(size=(imagem.shape[1], imagem.shape[0]), colorfmt='bgr')"

[Mateus Michels]

Problem happens because i'm runing that code in a

separate thread

Em segunda-feira, 8 de outubro de 2018 11:57:58 UTC-3, Mateus Michels escreveu:

[Sato Takenori]

Hi,

I have used OpenCV 3.x ~ 3.4.2 on Kivy 1.10.0 and 1.10.1 

in the way by loading OpenCV image as a Texture of Image.

My method of texture creation is as follows.

    def texture_from_opencv(self, frame, colorfmt='bgr'):

        resolution = (int(frame.shape[1]), int(frame.shape[0]))

        texture = Texture.create(resolution)

        texture.flip_vertical()

        texture.blit_buffer(frame.tostring(), colorfmt=colorfmt)

        return texture

As you can see, this does basically the same thing as yours.

> Problem happens because i'm runing that code in a 

> separate thread

Do you use Process in addition to Threading?

For example, I run an expensive method(e.g. GPU object detection) in a separate Process.

In such a case, you need to make sure any thread is created after Process creations 

because Python on Linux uses a fork to create a new Process 

that copies existing threads of its parent Process,

which would lead to ugly dead locking issues.

It is often suggested in SDL/OpenGL communities.

Try enabling more verbose debugging.

2018年10月9日(火) 0:12 Mateus Michels <thi...@gmail.com>:

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[Gregori Alberto Rovadoscki]

Were you able to run Yolo on Kivy?

[Gregori Alberto Rovadoscki]

Were you able to run Yolo on Kivy APK?

[Robert]

Rather than fight the opencv camera in Android (I don't think it works) take a look at this object detection example:
https://github.com/Android-for-Python/c4k_tflite_example

Or the same architecture using opencv image processing, just not Yolo
https://github.com/Android-for-Python/c4k_opencv_example

[Gregori Alberto Rovadoscki]

great, tflite works with instance segmentation??

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Gregori Rovadoscki
Bacharel em Zootecnia - UDESC
Mestre em Ciências - ESALQ/USP
Doutor em Ciências - ESALQ/USP
Piracicaba - São Paulo

[Robert]

No clue what the even means 🤣

[Gregori Alberto Rovadoscki]

No problem, you help me a lot. I really appreciate your attention.....

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