Image buffers.

The following list gives the name of each of the image buffers in the autopguider system. Each of these can be diaplyed on the second page of the autoguider display with the D-PLOT, D+PLOT , ADD-PLOT or ADD+PLOT commands.j

Images are plotted as unsigned data. The D-PLOT command clears the screen and plots one image, ( as a marginal average if the image is 2 dimensional ). The ADD-PLOT command draws the plot on top of the previous one. The D+PLOT and ADD+PLOT commands add 30,000 to the image to cope with signed data, with '0' displayed as 30000.

The current buffers can be listed with the .DCA command; beware, there are a lot of them. To see the list of buffers with the .DCA command, click here.

• #dici-data, buffer 0: The buffer where the image is recieved from the CCD controller.
• #ccd-data, buffer 1: Contains the image after dark current removal. This is what is displayed on the screen.
• #recon-patt, buffer 2; This buffer hold the window pattern for unscrambling the multi-window readout data.
• #cass-ro, buffer 3, This contains the Cassegrain CCD dakr current pattern.
• #cass-dark, buffer 4, This contains the Cassegrain CCD integration time dependend part of the dark current pattern.
• #ues-ro, ... #lab-dark, These buffers contain dark curent patterns for other ccd heads.
• #field-area, The acquisition window, used during the field command.
• #im-win, an intermediate buffer for multi window readout.
• #im-cen, the window to be centroided.
• #im-filt1, Usually contains a smoothed version of #im-cen.
• #1dx,#1dy: Marginal sums containing the average pixel in each row or column.
• #seex #seey, The profiles used to calculate the seeing value. These are marginalsums of the image less dark current.
• #hist, contains a 1000 adu histogram of the 2d image, pixels above 1000 are ignored.
• #hist2 contains the peak of the histogram in #hist1 which is centroided to estimate the sky.
• #slope contains the differential in x of the 1d profiles, used during the slope removal.
• #gauss contains a width scaled version of the gaussian profile used to correlate with.
• #signal contains the differential of the #1dx ir #1dy image, iserted into a blank buffer ready for correlation.
• #gref contains the differential of the gaussian reference.
• #corrx, #corry contain the correlation functions.
• #cextx, #cexty contain the peak of the correlation functions.
• #cmx, #cmy contain the correlation function weighted with the input profile, the peak of which is a rough centroid.
• #slcorr contains the correlation from the one half window of the slit.