Is NI-Vision 16-bit BCG subvi incorrect?

I am attempting to do a BCG adjustment on a 16-bit image. I downloaded the 16-bit version of the NI-vision BCG adjust subvi, but I believe it to be working incorrectly. From the documentation, it seems that values of 0,45, and 1 for brightness, contrast, and gamma respectively should yield the exact same image as previously. This does not happen.
I have attached a little library containing an example of this and the BCG subvi. I picked a random image from my data and threw it in there. Also, I'm sure I could find some BCG values to make the output image the same as the input image, however these values do not stay constant from image to image.
Attachments:
BCG_incorrect.llb ‏389 KB

Christos,
Just a couple of things that I'd like to clarify...
At issue are two points:
1) Whether or not your acquired image is unsigned 16-bit, IMAQ only supports a signed 16-bit format. You'll see that the IMAQ buffer you're passing into the LUT VI in your code is actually a signed 16-bit image buffer.
2) It seems that you'd like to redefine "brightness" in a different way in which it was "defined" in the previous VI. This is fine, but we have to change the formulas a little bit.
Notes:
If I understand you correctly, you'd like to input a brightness of 0 and have your image be entirely dark. And you'd like to input a brightness of 65,535 and have the image be entirely light. That is not the way the VI has currently been set up. (Right now, the VI accepts a brightness input such that an input of 0 corresponds to a normal distribution of pixel values. Meaning that a 0 pixel value comes through the LUT as 0. If you increase the brightness to 1, at the input pixel value of 0 the output of the LUT is 1. Hence, the image is brighter. If you set the brightness to 32,767, then the input pixel value of 0 has an output of the LUT of 32,767. This is the brightest value in the signed 16-bit format. Every pixel value greater than 0 would rail at the 32,767 value.)
So if you're wanting to adjust the "definition" of brightness per my interpretation above (0=totally dark and 65,535=totally bright), you'd need to do the following:
* Brightness=65,535: The darkest pixel value (0 in the unsigned 16-bit format) would need to get the lightest LUT output (32,767 in the signed 16-bit format) for a brightness of 65,535. This would correspond to the lightest pixel value (65,535 in your unsigned 16-bit format) getting an LUT output value of 98,302. Values greater than 32,767 are coerced to 32,767 in the signed 16-bit format. Hence all pixel values would be the most bright possible.
* Brightness=0: The lightest pixel value (65,535 in your unsigned 16-bit) needs to get the darkest LUT output (-32,768 for signed 16-bit) at a brightness of 0. This would make the darkest pixel value (0 in your unsigned 16-bit) get an LUT output of -98,303. As above, pixel values less than -32,768 are coerced to -32,768 in the signed 16-bit format.
Code:
I've gone through your code as attached in your previous message and altered it slightly to where it will now exhibit the brightness behavior as described above. I've included some new text notes on the block diagram that kind of explain what's going on.
I hope this is helpful to you. And I hope this explanation is somewhere close to clear. It's a little involved, but ultimately do-able. Best of luck in getting this implemented...
Jim Laudie
Applications Engineer, National Instruments
Attachments:
bcg16bit-test adjusted for Christos.vi ‏327 KB

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