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authorDaniil Cherednik <dan.cherednik@gmail.com>2018-09-29 01:21:59 +0300
committerDaniil Cherednik <dan.cherednik@gmail.com>2018-09-29 01:21:59 +0300
commitd52df7442209819eac6db995420aa32c82c06aeb (patch)
tree6cd3471ff552b95c79eec1582b1ca8bd45086f56
parent1216b63c7b6864b0faeb2c6fd68a2a0ef5893f0e (diff)
downloadanalogcolor-d52df7442209819eac6db995420aa32c82c06aeb.tar.gz
Simple comb filter added for chroma/luma separation
-rw-r--r--src/libanalog/ntsc.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/src/libanalog/ntsc.c b/src/libanalog/ntsc.c
index 2aaea49..2fe1b21 100644
--- a/src/libanalog/ntsc.c
+++ b/src/libanalog/ntsc.c
@@ -31,6 +31,8 @@ struct ntsc_ctx {
} generator;
uint16_t width;
struct ntsc_iq* iq;
+ float* luma;
+ float* chroma;
struct biquad_filter_ctx i_filter;
struct biquad_filter_ctx q_filter;
@@ -112,6 +114,8 @@ ntsc_ctx* ntsc_create_context(int width, int encode)
p->width = width;
ntsc_create_generator(p);
p->iq = malloc(sizeof(struct ntsc_iq) * width);
+ p->luma = calloc(width, sizeof(float));
+ p->chroma = calloc(width, sizeof(float));
ntsc_filter_init(&p->i_filter, 0.08);
ntsc_filter_init(&p->q_filter, 0.05);
@@ -124,6 +128,8 @@ void ntsc_free_context(ntsc_ctx* ctx)
if (ctx->verbose)
free(ctx->verbose);
ntsc_free_generator(ctx);
+ free(ctx->luma);
+ free(ctx->chroma);
free(ctx->iq);
free(ctx);
}
@@ -237,11 +243,25 @@ void ntsc_process_decode(const float* input, float* output, ntsc_ctx* ctx)
{
int i;
- ntsc_demodulate_line(input, ctx);
+ for (i = 0; i < ctx->width; i++) {
+ float* l = ctx->luma + i;
+ float* c = ctx->chroma + i;
+ *l = (input[i] + *l) / 2.0;
+ *c = (input[i] - *c) / 2.0;
+ }
+
+ ntsc_demodulate_line(ctx->chroma, ctx);
for (i = 0; i < ctx->width; i++) {
struct ntsc_iq* iq = ctx->iq + i;
- ntsc_iqy_to_rgb(iq, input[i], output + i * 3);
+ ntsc_iqy_to_rgb(iq, ctx->luma[i], output + i * 3);
+ }
+
+ for (i = 0; i < ctx->width; i++) {
+ float* l = ctx->luma + i;
+ float* c = ctx->chroma + i;
+ *l = input[i];
+ *c = input[i];
}
ntsc_next_line(ctx);