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still working on the psychovisual model

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minjaesong
2025-09-21 01:36:31 +09:00
parent 206e43a308
commit 5d48cc62eb
2 changed files with 50 additions and 42 deletions
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46
video_encoder/encoder_tav.c
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@@ -800,41 +800,45 @@ static void quantise_dwt_coefficients(float *coeffs, int16_t *quantised, int siz
// Get perceptual weight for specific subband - Data-driven model based on coefficient variance analysis
static float get_perceptual_weight(int level, int subband_type, int is_chroma, int max_levels) {
// Psychovisual model based on DWT coefficient statistics and Human Visual System sensitivity
// strategy: JPEG quantisation table + real-world statistics from the encoded videos
if (!is_chroma) {
// LUMA CHANNEL: Based on statistical analysis from real video content
if (subband_type == 0) { // LL subband - contains most image energy, preserve carefully
if (level >= 6) return 0.6f; // LL6: High energy but can tolerate moderate quantization (range up to 22K)
if (level >= 6) return 0.5f; // LL6: High energy but can tolerate moderate quantization (range up to 22K)
if (level >= 5) return 0.7f; // LL5: Good preservation
return 0.8f; // Lower LL levels: Fine preservation
return 0.9f; // Lower LL levels: Fine preservation
} else if (subband_type == 1) { // LH subband - horizontal details (human eyes more sensitive)
if (level >= 6) return 0.7f; // LH6: Significant coefficients (max ~500), preserve well
if (level >= 5) return 0.8f; // LH5: Moderate coefficients (max ~600)
if (level >= 4) return 1.0f; // LH4: Small coefficients (max ~50)
if (level >= 3) return 1.2f; // LH3: Very small coefficients, can quantize more
if (level >= 2) return 1.4f; // LH2: Minimal impact
return 1.6f; // LH1: Least important
if (level >= 6) return 0.8f; // LH6: Significant coefficients (max ~500), preserve well
if (level >= 5) return 1.0f; // LH5: Moderate coefficients (max ~600)
if (level >= 4) return 1.2f; // LH4: Small coefficients (max ~50)
if (level >= 3) return 1.6f; // LH3: Very small coefficients, can quantize more
if (level >= 2) return 2.0f; // LH2: Minimal impact
return 2.5f; // LH1: Least important
} else if (subband_type == 2) { // HL subband - vertical details (less sensitive due to HVS characteristics)
if (level >= 6) return 0.9f; // HL6: Can quantize more aggressively than LH6
if (level >= 5) return 1.0f; // HL5: Standard quantization
if (level >= 4) return 1.3f; // HL4: Notable range but less critical
if (level >= 3) return 1.5f; // HL3: Can tolerate more quantization
if (level >= 2) return 1.7f; // HL2: Less important
return 2.0f; // HL1: Most aggressive for vertical details
if (level >= 6) return 1.0f; // HL6: Can quantize more aggressively than LH6
if (level >= 5) return 1.2f; // HL5: Standard quantization
if (level >= 4) return 1.5f; // HL4: Notable range but less critical
if (level >= 3) return 2.0f; // HL3: Can tolerate more quantization
if (level >= 2) return 2.5f; // HL2: Less important
return 3.5f; // HL1: Most aggressive for vertical details
} else { // HH subband - diagonal details (least important for HVS)
if (level >= 6) return 1.1f; // HH6: Preserve some diagonal detail
if (level >= 5) return 1.3f; // HH5: Can quantize aggressively
if (level >= 4) return 1.6f; // HH4: Very aggressive
if (level >= 3) return 2.0f; // HH3: Minimal preservation
if (level >= 2) return 2.2f; // HH2: Maximum compression
return 2.5f; // HH1: Most aggressive quantization
if (level >= 6) return 1.2f; // HH6: Preserve some diagonal detail
if (level >= 5) return 1.6f; // HH5: Can quantize aggressively
if (level >= 4) return 2.0f; // HH4: Very aggressive
if (level >= 3) return 2.8f; // HH3: Minimal preservation
if (level >= 2) return 3.5f; // HH2: Maximum compression
return 5.0f; // HH1: Most aggressive quantization
}
} else {
// CHROMA CHANNELS: Less critical for human perception, more aggressive quantization
// strategy: mimic 4:2:2 chroma subsampling
if (subband_type == 0) { // LL chroma - still important but less than luma
return 1.0f;
if (level >= 6) return 0.8f; // Chroma LL6: Less critical than luma LL
if (level >= 5) return 0.9f;
return 1.0f;
} else if (subband_type == 1) { // LH chroma - horizontal chroma details
return 1.8f;
if (level >= 6) return 1.0f;
if (level >= 5) return 1.2f;
if (level >= 4) return 1.4f;
@@ -842,6 +846,7 @@ static float get_perceptual_weight(int level, int subband_type, int is_chroma, i
if (level >= 2) return 1.8f;
return 2.0f;
} else if (subband_type == 2) { // HL chroma - vertical chroma details (even less critical)
return 1.3f;
if (level >= 6) return 1.2f;
if (level >= 5) return 1.4f;
if (level >= 4) return 1.6f;
@@ -849,6 +854,7 @@ static float get_perceptual_weight(int level, int subband_type, int is_chroma, i
if (level >= 2) return 2.0f;
return 2.2f;
} else { // HH chroma - diagonal chroma details (most aggressive)
return 2.5f;
if (level >= 6) return 1.4f;
if (level >= 5) return 1.6f;
if (level >= 4) return 1.8f;