intensity_ratio_inside_ring

ctapipe.image.intensity_ratio_inside_ring(pixel_fov_lon: Quantity, pixel_fov_lat: Quantity, weights: Quantity | ndarray | Sequence[float], ring: MuonRingContainer, width: Quantity) → float

Calculate the ratio of the photons inside a given ring with coordinates (center_fov_lon, center_fov_lat), radius and width.

The ring is assumed to be in [radius - 0.5 * width, radius + 0.5 * width]

Parameters:

pixel_fov_lonQuantity

Longitudes (x-coordinates) of the camera pixels in the TelescopeFrame.

pixel_fov_latQuantity

Latitudes (y-coordinates) of the camera pixels in the TelescopeFrame.

weightsQuantity | np.ndarray | Sequence[float]

Weights for the camera pixels, usually the photoelectron charges.

ringMuonRingContainer

Container with the fitted ring parameters, including center coordinates and radius.

widthQuantity

Width of the ring.

Returns:

float

The ratio of the photons inside the ring to the total photons.

Notes

This function calculates the ratio of the photons inside a given ring by determining the pixels that fall within the specified ring width and summing their weights. The ratio is the sum of the weights inside the ring divided by the total sum of the weights.