Normalize

[woo1]

Hi. Thanks for sharing good code.

I'm confusing about noramlizing.

normalize_x, normalize_y functions in util.py

It looks like normalizing dicom pixel data.
How can I use this method for 8 bit images? (0 ~ 255)
Can you tell me about the variable and parameter's meaning like "lower", "upper", "1024"?

Thank you!

[hmshan]

Hi,

Thanks for your interest.

The normalization function is to normalize a certain range into [0, 1]. For your 8 bit image, you can divide it by 255.0.

For a CT image, the intensity ranges from -1000 to 1000+ HU. If the image has metal, the maximum intensity could be even larger.

The "1024" is the offset. The matrix saved in the dicom file is unsigned integer. After subtracting it from 1024, the value will be standard HU. Then you can normalize the range of [lower, upper] into [0, 1].