Which processing step is primarily responsible for mapping pixel values to display brightness levels?

Which processing step is primarily responsible for mapping pixel values to display brightness levels?

• A. Histogram Analysis
• B. Rescaling
• C. LUT Adjustments
• D. Digitization

Answer: (C)

The step that maps pixel values to display brightness levels is the LUT adjustments. After the image is digitized, each stored gray value needs to be translated into a display-level brightness compatible with the monitor. The Look-Up Table provides that translation by assigning a display gray level to every possible pixel value. Window level and window width are practical ways to configure this LUT, controlling overall brightness and contrast seen on the image. Histogram analysis helps guide what window level and width might be most appropriate by showing how the pixel values are distributed, but it doesn’t perform the display mapping itself. Rescaling can alter the range of pixel values, but the actual brightness mapping to the monitor comes from the LUT. Digitization is the earlier step that converts analog signals to digital values, setting the stage for LUT-based display mapping.

The step that maps pixel values to display brightness levels is the LUT adjustments. After the image is digitized, each stored gray value needs to be translated into a display-level brightness compatible with the monitor. The Look-Up Table provides that translation by assigning a display gray level to every possible pixel value. Window level and window width are practical ways to configure this LUT, controlling overall brightness and contrast seen on the image.

Histogram analysis helps guide what window level and width might be most appropriate by showing how the pixel values are distributed, but it doesn’t perform the display mapping itself. Rescaling can alter the range of pixel values, but the actual brightness mapping to the monitor comes from the LUT. Digitization is the earlier step that converts analog signals to digital values, setting the stage for LUT-based display mapping.