MOPEX User's Guide - IRSA

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8.4.4 Grid Distribution MOPEX User’s Guide As a fast alternative of the area overlap method the grid interpolation is implemented. Each input pixel is filled with Grid Ratio (GRID_RATIO) squared grid points (see Figure 8.20). Each grid point is assigned the value of the pixel it belongs to. Each grid point is projected onto the output frame and the flux associated with the grid point is added to the output image pixel into which the grid point was projected. The value Oj of an output interpolated pixel j is equal to the weighted average of the input pixels Ii O j = n ji ∑ Ii , where i N j N j = n ji Basic Concepts in MOPEX 204 Image Interpolation ∑ j Equation 8.13 where nji is the number of the grid points projected into the output pixel j from the input pixel i. The parameter Grid Ratio specifies the number of grid points in one direction in an input pixel. In other words there are Grid Ratio squared grid points per input pixel. If Grid Ratio = 1 and the input to output pixel size ratio PR = 1, the method is equivalent to the nearest-neighbor interpolation. In the limit of infinite Grid Ratio the method approaches the area overlap interpolation. The main purpose of this scheme is to create first-look mosaic images fast, the gain in speed being up to 10 times as fast as scheme one. The price you pay is the fidelity of the interpolated images. Do not use these images for science. Figure 8.20: Input pixel (red) is filled with a grid of points. When the input pixel is projected onto the output array (blue) each point contributes an equal share of the input pixel value to the output pixel it is in.
8.4.5 Cubic: Bicubic Interpolation MOPEX User’s Guide For the bicubic interpolation the value O(j) of the output pixel j is computed as a linear combination of the input pixel values 16 ∑ O( j) = C( j,i)I(i) i=1 Equation 8.14 at the 16 positions i closest to j. The coefficients C(j,i) depend on the distance between the points: C( j,i) = h(x j − x i)h(y j − y i ); a30 x h(x) = 3 + a20 x 2 + a10 x + a00, a31 x 3 + a21 x 2 ⎧ ⎪ ⎨ + a11 x + a01, ⎪ ⎩ 0, 0 ≤ x
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MOPEX User’s Guide MOsaicking and
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MOPEX User’s Guide Chapter 4. Ove
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MOPEX User’s Guide 7.4 PRF Estima
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Chapter 1. Introduction MOPEX User
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MOPEX User’s Guide • If you are
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for Linux and Solaris systems, and:
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Chapter 2. Overview of MOPEX MOPEX
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For instructions on how to run MOPE
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2.3.1 Additional Functionality MOPE
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MOPEX User’s Guide mosaic_mask.pl
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MOPEX User’s Guide Choosing the r
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MOPEX User’s Guide photometry), o
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Chapter 3. MOPEX Input MOPEX User
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3.2 MOPEX Input List Files MOPEX Us
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Chapter 4. Overlap (overlap.pl) MOP
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MOPEX User’s Guide 3. Background
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MOPEX User’s Guide Output Directo
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ncpu_multiprocess = 1 default = 1 I
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4.3.3 Overlap Modules: S/N Estimato
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σ = σ 2 readnoise g 2 + σ 2 conf
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MOPEX User’s Guide Generated Head
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OUTPUT MOPEX User’s Guide Generat
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OUTPUT MOPEX User’s Guide Generat
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MOPEX User’s Guide When choosing
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MOPEX User’s Guide offsets and th
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Chapter 5. Mosaicking (mosaic.pl) M
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MOPEX User’s Guide They do not ne
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MOPEX User’s Guide interpolated u
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MOPEX User’s Guide more informati
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MOPEX User’s Guide Pixel by Size:
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OUTPUT None DISCUSSION MOPEX User
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MOPEX User’s Guide This module al
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MOPEX User’s Guide negative numbe
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DISCUSSION MOPEX User’s Guide For
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MOPEX User’s Guide then interpola
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MOPEX User’s Guide This module pe
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DISCUSSION MOPEX User’s Guide Mos
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PURPOSE MOPEX User’s Guide This m
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DISCUSSION No further information.
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MOPEX User’s Guide processed in o
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MOPEX User’s Guide Min Pix Number
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MOPEX User’s Guide Box Median Bia
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MOPEX User’s Guide If coverage >=
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MOPEX User’s Guide Refine Outlier
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MOPEX User’s Guide Reinterpolatio
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PURPOSE MOPEX User’s Guide The in
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MOPEX User’s Guide The tile speci
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MOPEX User’s Guide Standard Devia
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Mosaic Coverage File (mosaic_cov.fi
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There are no user-defined input par
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COMMAND LINE INPUT See INPUT. OUTPU
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MOPEX User’s Guide limitations di
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6.3 Running APEX MOPEX User’s Gui
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MOPEX User’s Guide Point Source D
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Figure 6.1: Overview of the main pr
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Relevant Pipelines: All PURPOSE INP
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NICE = 1 save_namelist = 1 MOPEX Us
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MOPEX User’s Guide Mosaic PRF Fil
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create_unc_mosaic = 1 use_std_to_de
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MOPEX User’s Guide Use Refined Po
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MOPEX User’s Guide Here FLUXCONV
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MOPEX User’s Guide This module cr
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MOPEX User’s Guide year) and with
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MOPEX User’s Guide Mosaic FIF Tab
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MOPEX User’s Guide Tile BCD file
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MOPEX User’s Guide Window X, Y: (
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MOPEX User’s Guide neighboring pi
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⎛ ⎜ ⎜ P( j) = ⎜ 1+ ⎜ ⎜
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&END MOPEX User’s Guide if use_ps
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MOPEX User’s Guide \float Tile_Of
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MOPEX User’s Guide Input Type: De
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MOPEX User’s Guide pixels set to
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MOPEX User’s Guide This module co
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MOPEX User’s Guide is recorded as
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&END OUTPUT MOPEX User’s Guide Th
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INPUT Columns selection: MOPEX User
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PURPOSE MOPEX User’s Guide Fits t
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MOPEX User’s Guide given below. O
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6.5.19 APEX Modules: Aperture Photo
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