Hand tracking cannot handle gray image

[Javacr]

Have I written custom code (as opposed to using a stock example script provided in MediaPipe)

None

OS Platform and Distribution

windows 10

MediaPipe Tasks SDK version

0.10.3

Task name (e.g. Image classification, Gesture recognition etc.)

hand tracking

Programming Language and version (e.g. C++, Python, Java)

python

Describe the actual behavior

cv_img = cv2.cvtColor(cv_img, cv2.COLOR_RGB2GRAY)
cv_img = cv2.cvtColor(cv_img, cv2.COLOR_GRAY2BGR)

I use cv2.cvtColor convert rgb image to graysacle and give it three channel by GRAY2BG, hand tracking outputs nothing with this image. RGB image can work well.

Describe the expected behaviour

Script outputs hand landmarks

Standalone code/steps you may have used to try to get what you need

I follow the example: https://colab.research.google.com/github/googlesamples/mediapipe/blob/main/examples/hand_landmarker/python/hand_landmarker.ipynb

Other info / Complete Logs

No response

[hheydary]

Greetings, I'm not able to reproduce this issue. Modifying the notebook with the following lines, the model continues to work as expected.

cv_img = cv2.imread("image.jpg")[:, :, ::-1].copy()
cv_img = cv2.cvtColor(cv_img, cv2.COLOR_RGB2GRAY)
cv_img = cv2.cvtColor(cv_img, cv2.COLOR_GRAY2RGB)
image = mp.Image(image_format=mp.ImageFormat.SRGB, data=cv_img)

[Javacr]

Greetings, I'm not able to reproduce this issue. Modifying the notebook with the following lines, the model continues to work as expected.

cv_img = cv2.imread("image.jpg")[:, :, ::-1].copy()
cv_img = cv2.cvtColor(cv_img, cv2.COLOR_RGB2GRAY)
cv_img = cv2.cvtColor(cv_img, cv2.COLOR_GRAY2RGB)
image = mp.Image(image_format=mp.ImageFormat.SRGB, data=cv_img)

Thank you! I sloved this problem, the reason is that the hand is too small in image, palm detector can not detect successfully. when I crop the image, everything is ok!

[kuaashish]

@Javacr

Thank you for your confirmation, Please let us know if now this is no longer issue from your end, Can we move the status to resolved and close the issue.

[github-actions[bot]]

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[google-ml-butler[bot]]

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