Uncompressed 8-bit format produces a lot of haze at the bottom of the image

ThiagoFerrao / solum

APIs for OEMs to Create Standalone Applications

https://www.clarius.com

BSD 3-Clause "New" or "Revised" License

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Uncompressed 8-bit format produces a lot of haze at the bottom of the image #3

Open ujrm opened 3 months ago

ujrm commented 3 months ago

Describe the bug There's a lot of haze towards the bottom of the image (see attached screenshot).

To Reproduce Steps to reproduce the behavior:

Tap Download scanner info
Enable Bluetooth searching
Select probe
Tap Load Selected Scanner Details
Connect to probe's WiFi
Tap Connect
Change Application to "msk"
Tap Load Application
Tap Run Imaging

It's also like this if you:

Select "auto-gain" parameter
Change value to 0
Tap "Set"

Environment:

SDK variant [e.g. python wrappers, iOS Framework]: iOS Framework
Development platform [e.g. Linux, Xcode]: Xcode
SDK version: 11.3
Clarius App version: -

Screenshot 2024-06-25 at 15 55 46

clariusk commented 3 months ago

This seems like normal noise from having a higher gain - I do not believe this is an artefact from outside the normal image processing chain.

Further requests:

Run the same test in Clarius App by turning off auto gain and increase manual gain.
Provide images with the different compression formats (not PNG does not seem stable) for additional comparison keeping the same imaging settings

ujrm commented 3 months ago

The noise is present using Uncompressed8Bit at 50% gain with auto-gain turned off, but not when using Uncompressed with the same gain settings. The only change made was the format.

clariusk commented 3 months ago

Still not able to reproduce, images look exactly the same with L7HD3/MSK/Auto Gain Off/50% gain level, all on a high dynamic range screen

If you can post 2 raw BMP images with just changing the format, we can run some histogram analysis.

In our code, nothing changes except for a Qt library call to QImage::convertTo(QImage::Format_Grayscale8)

ThiagoFerrao commented 2 months ago

@clariusk, as you requested, some examples of images with uncompressed and uncompressed8Bit formats. I also added the images in the png format, since it is the format that we are going to use in our app.

examples.zip

clariusk commented 1 month ago

Now i have an understanding that I am not comparing image to image based on the examples, after deep diving and investigating more, this seems to be normal due to the fact that Clarius is not controlling the conversion. The Clarius App uses the XRGB data in our App an we'll convert elsewhere in the path, but never to the 8-bit format that Solum provides.

Our conversion code is using Qt library's QImage::convertTo(QImage::Format_Grayscale8) for what it's worth.