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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
tsvm_core/src/net/torvald/tsvm/GraphicsJSR223Delegate.kt
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@@ -3896,47 +3896,47 @@ class GraphicsJSR223Delegate(private val vm: VM) {
when (subbandType) {
0 -> { // LL subband - contains most image energy, preserve carefully
return when {
level >= 6 -> 0.6f // LL6: High energy but can tolerate moderate quantization (range up to 22K)
level >= 6 -> 0.5f // LL6: High energy but can tolerate moderate quantization (range up to 22K)
level >= 5 -> 0.7f // LL5: Good preservation
else -> 0.8f // Lower LL levels: Fine preservation
else -> 0.9f // Lower LL levels: Fine preservation
}
}
1 -> { // LH subband - horizontal details (human eyes more sensitive)
return when {
level >= 6 -> 0.7f // LH6: Significant coefficients (max ~500), preserve well
level >= 5 -> 0.8f // LH5: Moderate coefficients (max ~600)
level >= 4 -> 1.0f // LH4: Small coefficients (max ~50)
level >= 3 -> 1.2f // LH3: Very small coefficients, can quantize more
level >= 2 -> 1.4f // LH2: Minimal impact
else -> 1.6f // LH1: Least important
level >= 6 -> 0.8f // LH6: Significant coefficients (max ~500), preserve well
level >= 5 -> 1.0f // LH5: Moderate coefficients (max ~600)
level >= 4 -> 1.2f // LH4: Small coefficients (max ~50)
level >= 3 -> 1.6f // LH3: Very small coefficients, can quantize more
level >= 2 -> 2.0f // LH2: Minimal impact
else -> 2.5f // LH1: Least important
}
}
2 -> { // HL subband - vertical details (less sensitive due to HVS characteristics)
return when {
level >= 6 -> 0.9f // HL6: Can quantize more aggressively than LH6
level >= 5 -> 1.0f // HL5: Standard quantization
level >= 4 -> 1.3f // HL4: Notable range but less critical
level >= 3 -> 1.5f // HL3: Can tolerate more quantization
level >= 2 -> 1.7f // HL2: Less important
else -> 2.0f // HL1: Most aggressive for vertical details
level >= 6 -> 1.0f // HL6: Can quantize more aggressively than LH6
level >= 5 -> 1.2f // HL5: Standard quantization
level >= 4 -> 1.5f // HL4: Notable range but less critical
level >= 3 -> 2.0f // HL3: Can tolerate more quantization
level >= 2 -> 2.5f // HL2: Less important
else -> 3.5f // HL1: Most aggressive for vertical details
}
}
3 -> { // HH subband - diagonal details (least important for HVS)
return when {
level >= 6 -> 1.1f // HH6: Preserve some diagonal detail
level >= 5 -> 1.3f // HH5: Can quantize aggressively
level >= 4 -> 1.6f // HH4: Very aggressive
level >= 3 -> 2.0f // HH3: Minimal preservation
level >= 2 -> 2.2f // HH2: Maximum compression
else -> 2.5f // HH1: Most aggressive quantization
level >= 6 -> 1.2f // HH6: Preserve some diagonal detail
level >= 5 -> 1.6f // HH5: Can quantize aggressively
level >= 4 -> 2.0f // HH4: Very aggressive
level >= 3 -> 2.8f // HH3: Minimal preservation
level >= 2 -> 3.5f // HH2: Maximum compression
else -> 5.0f // HH1: Most aggressive quantization
}
}
else -> 1.0f
}
} else {
// CHROMA CHANNELS: Less critical for human perception, more aggressive quantization
when (subbandType) {
0 -> { // LL chroma - still important but less than luma
return 1f
return when {
level >= 6 -> 0.8f // Chroma LL6: Less critical than luma LL
level >= 5 -> 0.9f
@@ -3944,6 +3944,7 @@ class GraphicsJSR223Delegate(private val vm: VM) {
}
}
1 -> { // LH chroma - horizontal chroma details
return 1.8f
return when {
level >= 6 -> 1.0f
level >= 5 -> 1.2f
@@ -3954,6 +3955,7 @@ class GraphicsJSR223Delegate(private val vm: VM) {
}
}
2 -> { // HL chroma - vertical chroma details (even less critical)
return 1.3f;
return when {
level >= 6 -> 1.2f
level >= 5 -> 1.4f
@@ -3964,6 +3966,7 @@ class GraphicsJSR223Delegate(private val vm: VM) {
}
}
3 -> { // HH chroma - diagonal chroma details (most aggressive)
return 2.5f
return when {
level >= 6 -> 1.4f
level >= 5 -> 1.6f
@@ -3973,7 +3976,6 @@ class GraphicsJSR223Delegate(private val vm: VM) {
else -> 2.5f
}
}
else -> 1.0f
}
}
return 1.0f