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lavfi/nlmeans: use unsigned for the integral patch value 

This value can not be negative.
This commit is contained in:
Clément Bœsch 2018-05-07 18:45:52 +02:00
parent de956198a9
commit 4278f79ef6
1 changed files with 8 additions and 8 deletions
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16
libavfilter/vf_nlmeans.c
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@ -64,7 +64,7 @@ typedef struct NLMeansContext {
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 pdiff_lut_scale; // scale factor for patch differences before looking into the LUT
int max_meaningful_diff; // maximum difference considered (if the patch difference is too high we ignore the pixel)
uint32_t max_meaningful_diff; // maximum difference considered (if the patch difference is too high we ignore the pixel)
NLMeansDSPContext dsp;
} NLMeansContext;
@ -129,12 +129,12 @@ static int query_formats(AVFilterContext *ctx)
* contains the sum of the squared difference of every corresponding pixels of
* two input planes of the same size as M.
*/
static inline int get_integral_patch_value(const uint32_t *ii, int ii_lz_32, int x, int y, int p)
static inline uint32_t get_integral_patch_value(const uint32_t *ii, int ii_lz_32, int x, int y, int p)
{
const int a = ii[(y - p - 1) * ii_lz_32 + (x - p - 1)];
const int b = ii[(y - p - 1) * ii_lz_32 + (x + p )];
const int d = ii[(y + p ) * ii_lz_32 + (x - p - 1)];
const int e = ii[(y + p ) * ii_lz_32 + (x + p )];
const uint32_t a = ii[(y - p - 1) * ii_lz_32 + (x - p - 1)];
const uint32_t b = ii[(y - p - 1) * ii_lz_32 + (x + p )];
const uint32_t d = ii[(y + p ) * ii_lz_32 + (x - p - 1)];
const uint32_t e = ii[(y + p ) * ii_lz_32 + (x + p )];
return e - d - b + a;
}
@ -398,9 +398,9 @@ static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
const uint8_t *src = td->src + y*src_linesize;
struct weighted_avg *wa = s->wa + y*s->wa_linesize;
for (x = td->startx; x < td->endx; x++) {
const int patch_diff_sq = get_integral_patch_value(td->ii_start, s->ii_lz_32, x, y, td->p);
const uint32_t patch_diff_sq = get_integral_patch_value(td->ii_start, s->ii_lz_32, x, y, td->p);
if (patch_diff_sq < s->max_meaningful_diff) {
const int weight_lut_idx = patch_diff_sq * s->pdiff_lut_scale;
const unsigned weight_lut_idx = patch_diff_sq * s->pdiff_lut_scale;
const float weight = s->weight_lut[weight_lut_idx]; // exp(-patch_diff_sq * s->pdiff_scale)
wa[x].total_weight += weight;
wa[x].sum += weight * src[x];