Frequency-Time Image Conversion to rms

   

The command CONVERT/POWER_IMAGE takes in input the rough -T image which comes in output from the command MAKE/POWER_SPECTRUM (segmented option), extracts the homogeneous frequency-time part [@3,@2:>,>] and converts it to rms units. The output frame can be displayed in contour lines with the MIDAS command PLOT/CONTOUR

Each value of the power  is transformed in the following way

where   is the white noise level (input from the user),  is the frequency and t is the time. The syntax of the command is:

CONVERT/POWER_IMAGE inframe outframe [wnoise]

where:

• inframe is the input image (rough format as produced by MAKE/POWER_SPECTRUM).
• outframe is the output image.
• wnoise is the value for the white noise to be subtracted. Defaulted to 2.0.