tdose_utilities.py 文件源码

def gen_aperture(imgsize,ypos,xpos,radius,pixval=1,showaperture=False,verbose=True):
    """
    Generating an aperture image

    --- INPUT ---
    imgsize       The dimensions of the array to return. Expects [y-size,x-size].
                  The aperture will be positioned in the center of a (+/-x-size/2., +/-y-size/2) sized array
    ypos          Pixel position in the y direction
    xpos          Pixel position in the x direction
    radius        Radius of aperture in pixels
    showaperture  Display image of generated aperture
    verbose       Toggle verbosity

    --- EXAMPLE OF USE ---
    import tdose_utilities as tu
    apertureimg  = tu.gen_aperture([20,40],10,5,10,showaperture=True)
    apertureimg  = tu.gen_aperture([2000,4000],900,1700,150,showaperture=True)

    """
    if verbose: print ' - Generating aperture in image (2D array)'
    y , x    = np.ogrid[-ypos:imgsize[0]-ypos, -xpos:imgsize[1]-xpos]
    mask     = x*x + y*y <= radius**2.
    aperture = np.zeros(imgsize)

    if verbose: print ' - Assigning pixel value '+str(pixval)+' to aperture'
    aperture[mask] = pixval

    if showaperture:
        if verbose: print ' - Displaying resulting image of aperture'
        plt.imshow(aperture,interpolation='none')
        plt.title('Generated aperture')
        plt.show()

    return aperture
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