OcrEngine.RecognizeAsync method doesn't work on ARM64

Question

OcrEngine.RecognizeAsync method doesn't work on ARM64

MaracasLaya 1

This method always returns null only on ARM64.
But, It works perfectly on other platforms. (x86, x64, ARM32)
OcrEngine.RecognizeAsync isn't supported on ARM64?
Someone knows?

Visual Studio 2019 version 16.8.3
Device target OS Win10 Pro and Home 20H2 (19042.685)
Surface Pro X SQ1

Yan Gu - MSFT 2,681 Reputation points

2021-01-11T09:33:34.07+00:00

@MaracasLaya OcrEngine.RecognizeAsync is supported on ARM64.Could you please tell me are there languages supported(searching by using OcrEngine.AvailableRecognizerLanguages method) in your ARM64 machine?
I test an official OCR sample in my side, and it runs well. You could try to test the official sample in your side to see if the official sample can run well in your side.
MaracasLaya 1 Reputation point

2021-01-12T01:50:20.09+00:00
Thank you for your reply.
OcrEngine.AvailableRecognizerLanguages method has returned all supporting languages in my ARM64 device.
And the official OCR sample has detected correctly characters of "Windows platform sample" from a sample image in the app.

But, The RecognizeAsync method seems to have problems what some specific image patterns can't detect only on arm64.
So, I have tested some image patterns using the official sample app, the result is as follows:

Image number of successfully detected.

Arm64: 1 - 3

x86 and Arm32 in arm64 device: everything except 4

All of NG image patterns always returned OcrResult.Lines.Count is zero.

Tested images list is as follows (each size: 640 * 400):

When it's included color of black or close to black, the method on arm64 can't recognize correctly any characters?
Yan Gu - MSFT 2,681 Reputation points

2021-01-12T06:29:20.577+00:00

@MaracasLaya We are consulting other engineers for your question. There may be some delay.