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OpenCV encode CHW format image failed

asked 2020-10-11 21:15:43 -0500

Litchy gravatar image

updated 2020-10-12 02:22:48 -0500

I am using OpenCV python API, the image is HWC(Height, Width, Channel) at first(by default) and I use

img = cv2.imread(image_path) image_bytes = cv2.imencode(".jpg", img)[1]

it works well, the img variable is a ndarray with [224, 224, 3] shape

Then I transpose the image to CHW(Channel, Height, Width) format, using

img = img.transpose((2, 0, 1)) image_bytes = cv2.imencode(".jpg", img)[1]

And it raised error

Traceback: File "..." image_bytes = cv2.imencode(".jpg", img)[1] cv2.error: OpenCV(4.1.0) /io/opencv/modules/imgcodecs/src/loadsave.cpp:871: error: (-215:Assertion failed) channels == 1 || channels == 3 || channels == 4 in function 'imencode'

Does image encoding support CHW? How to do it correctly?

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answered 2020-10-12 02:41:36 -0500

berak gravatar image

Does image encoding support CHW?

no.

How to do it correctly?

either keep it HWC or split it into single channels and save those seperately

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Asked: 2020-10-11 20:36:02 -0500

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Last updated: Oct 12 '20