Illustration of the selection function over a typical input field. The background image represents an identical 256×256 input patch in all frames, centered on RA = 0.1 deg, Dec = −30.2 deg, using the renormalized input intensity but saturated at half the maximum value to increase visual contrast. The displayed grid corresponds to the detector output grid mapping for a network reduction factor of 16. The left frame is provided as an image reference, the middle frame represents all the target boxes from the True catalog, and the right frame represents the remaining target boxes after our selection function.