---

12.3.27 Pooling functions (pool.h) ¶

Pooling is the process of reducing the complexity of the input image (its size and variation of pixel values). Its underlying concepts, and an analysis of its usefulness, is fully described in Pooling operators. The following functions are available pooling in Gnuastro. Just note that unlike the Arithmetic operators, the output of these functions should contain a correct WCS in their output.

Function:
gal_data_t *
gal_pool_max (gal_data_t *input, size_t psize, size_t numthreads) ¶

Return the max-pool of input, assuming a pool size of psize pixels. The number of threads to use can be set with numthreads.

Function:
gal_data_t *
gal_pool_min (gal_data_t *input, size_t psize, size_t numthreads) ¶

Return the min-pool of input, assuming a pool size of psize pixels. The number of threads to use can be set with numthreads.

Function:
gal_data_t *
gal_pool_sum (gal_data_t *input, size_t psize, size_t numthreads) ¶

Return the sum-pool of input, assuming a pool size of psize pixels. The number of threads to use can be set with numthreads.

Function:
gal_data_t *
gal_pool_mean (gal_data_t *input, size_t psize, size_t numthreads) ¶

Return the mean-pool of input, assuming a pool size of psize pixels. The number of threads to use can be set with numthreads.

Function:
gal_data_t *
gal_pool_median (gal_data_t *input, size_t psize, size_t numthreads) ¶

Return the median-pool of input, assuming a pool size of psize pixels. The number of threads to use can be set with numthreads.