16bit image not correctly displayed by IMAQ Vision (IMAQ ArrayToImage.vi)

[MAILFERTSeb]

Dear developpers,

I'm trying to draw interactively and retrieve a Region of Interest in an image by using IMAQ Vision.

Before doing the ROI, I need to display the Image.

I have an array which comes from a camera, it's an array of 16bit data.

When I convert this array to an image by using "IMAQ ArrayToImage.vi".

The image is displayed but not correctly.

I tried to convert the array into a 16 or 8 bit array but without success.

Could you help me please?

Thanks,

Sébastien

[zou]

Are you using the 16 bit palette?

[Bob_Schor]

Yep, George nailed it.  Right-click your 16-bit display on the Front Panel, choose Palette from the Drop-down, then choose GreyScale.  Note that you get a rotated (do you know why?) version of your Intensity Graph.

Bob Schor

[MAILFERTSeb]

Yes, I use a 16bit palette

[MAILFERTSeb · Accepted solution]

The solution comes from the "16-bit display mapping" option: right-click on the image.

I don't know why the image is rotated...

[RamonG]

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@MAILFERTSeb wrote:

The solution comes from the "16-bit display mapping" option: right-click on the image.

I don't know why the image is rotated...

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The image is rotated because IMAQ displays a 2D array differently from an intensity graph. For IMAQ rows are displayed horizontally and the origin (X=0,Y=0) is top-left. The intensity graph displays rows vertically and the origin is bottom-left.

[wiebe@CARYA]

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@RamonG wrote:

The intensity graph displays rows vertically and the origin is bottom-left.

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By default. Right click it and set "transpose" (or transpose array) and it will rotate the data for you.

Than it might still be flipped, but typing a 0 in the max of the scale will flip the scale (or use the flipped property of the scale).