float sum;
};
-/*
- * Note: WEIGHT_LUT_SIZE must be larger than max_meaningful_diff
- * (log(255)*max(h)^2, which is approximately 500000 with the current
- * maximum sigma of 30).
- */
-#define WEIGHT_LUT_SIZE 500000
-
typedef struct NLMeansContext {
const AVClass *class;
int nb_planes;
ptrdiff_t ii_lz_32; // linesize in 32-bit units of the integral image
struct weighted_avg *wa; // weighted average of every pixel
ptrdiff_t wa_linesize; // linesize for wa in struct size unit
- float weight_lut[WEIGHT_LUT_SIZE]; // lookup table mapping (scaled) patch differences to their associated weights
+ float *weight_lut; // lookup table mapping (scaled) patch differences to their associated weights
uint32_t max_meaningful_diff; // maximum difference considered (if the patch difference is too high we ignore the pixel)
NLMeansDSPContext dsp;
} NLMeansContext;
const double h = s->sigma * 10.;
s->pdiff_scale = 1. / (h * h);
- s->max_meaningful_diff = -log(1/255.) / s->pdiff_scale;
- av_assert0((s->max_meaningful_diff - 1) < FF_ARRAY_ELEMS(s->weight_lut));
- for (i = 0; i < WEIGHT_LUT_SIZE; i++)
+ s->max_meaningful_diff = log(255.) / s->pdiff_scale;
+ s->weight_lut = av_calloc(s->max_meaningful_diff, sizeof(*s->weight_lut));
+ if (!s->weight_lut)
+ return AVERROR(ENOMEM);
+ for (i = 0; i < s->max_meaningful_diff; i++)
s->weight_lut[i] = exp(-i * s->pdiff_scale);
CHECK_ODD_FIELD(research_size, "Luma research window");
static av_cold void uninit(AVFilterContext *ctx)
{
NLMeansContext *s = ctx->priv;
+ av_freep(&s->weight_lut);
av_freep(&s->ii_orig);
av_freep(&s->wa);
}