Fixed-Gaussian 3DGS: L1+SSIM vs CVVDP Heatmap-L1

Generated 2026-07-13 14:51:28. Dataset: truck. Training uses initial COLMAP Gaussians only: capacity_mode=no_densify, 7000 iterations, resolution 2. Baseline is official L1+SSIM with lambda=0.2. VDP variants use detached CVVDP heatmap-normalized weights on L1, either without SSIM or with lambda_ssim=0.2.

This is a strong-compression/under-parameterized test: no new Gaussians are created during optimization.
If VDP helps here, it should appear as better allocation of limited Gaussian capacity around perceptually important regions.

Metrics

Method	Gaussians	PSNR	dPSNR	SSIM	dSSIM	LPIPS	LPIPS gain	Model path
No densify: L1 only	136029	24.152	-0.493	0.8503	-0.0344	0.1823	-0.0438	`/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/l1_only`
No densify: L1 + SSIM	136029	24.645	0.000	0.8847	0.0000	0.1384	0.0000	`/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/l1_ssim`
No densify: CVVDP heatmap weighted L1	136029	24.434	-0.211	0.8489	-0.0358	0.1849	-0.0465	`/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/vdp_heat_l1`
No densify: CVVDP heatmap weighted L1 + SSIM	136029	24.671	0.026	0.8822	-0.0025	0.1403	-0.0019	`/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/vdp_heat_l1_ssim`

Held-out test views

Raw summary

{
  "dataset": "/local/scratch-2/fy277/temp/metric_loss/external/datasets/dataset_3d/tanks_and_temples/truck",
  "iterations": 7000,
  "resolution": 2,
  "capacity_mode": "no_densify",
  "metrics": {
    "l1_only": {
      "SSIM": 0.850314199924469,
      "PSNR": 24.152469635009766,
      "LPIPS": 0.18225233256816864,
      "gaussians": 136029
    },
    "l1_ssim": {
      "SSIM": 0.884692907333374,
      "PSNR": 24.64515495300293,
      "LPIPS": 0.13840529322624207,
      "gaussians": 136029
    },
    "vdp_heat_l1": {
      "SSIM": 0.848922073841095,
      "PSNR": 24.433862686157227,
      "LPIPS": 0.18488210439682007,
      "gaussians": 136029
    },
    "vdp_heat_l1_ssim": {
      "SSIM": 0.882205605506897,
      "PSNR": 24.671142578125,
      "LPIPS": 0.1403375267982483,
      "gaussians": 136029
    }
  },
  "contact": "/local/scratch-2/fy277/temp/metric_loss/output/html_output/fixed_gaussian_vdp_compare_truck_20260713/assets/test_view_contact.jpg",
  "jobs": {
    "l1_only": {
      "label": "No densify: L1 only",
      "model_path": "/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/l1_only",
      "train_args": [
        "--lambda_dssim",
        "0.0"
      ]
    },
    "l1_ssim": {
      "label": "No densify: L1 + SSIM",
      "model_path": "/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/l1_ssim",
      "train_args": [
        "--lambda_dssim",
        "0.2"
      ]
    },
    "vdp_heat_l1": {
      "label": "No densify: CVVDP heatmap weighted L1",
      "model_path": "/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/vdp_heat_l1",
      "train_args": [
        "--lambda_dssim",
        "0.0",
        "--metric_config",
        "configs/metrics/single/cvvdp_heatmap.yaml",
        "--loss_blend",
        "cvvdp_weighted_l1",
        "--perceptual_max_side",
        "512",
        "--cvvdp_weight_strength",
        "1.0",
        "--cvvdp_weight_min",
        "0.25",
        "--cvvdp_weight_max",
        "4.0"
      ]
    },
    "vdp_heat_l1_ssim": {
      "label": "No densify: CVVDP heatmap weighted L1 + SSIM",
      "model_path": "/local/scratch-2/fy277/temp/metric_loss/output/fixed_gaussian_vdp_compare/truck/vdp_heat_l1_ssim",
      "train_args": [
        "--lambda_dssim",
        "0.2",
        "--metric_config",
        "configs/metrics/single/cvvdp_heatmap.yaml",
        "--loss_blend",
        "cvvdp_weighted_l1",
        "--perceptual_max_side",
        "512",
        "--cvvdp_weight_strength",
        "1.0",
        "--cvvdp_weight_min",
        "0.25",
        "--cvvdp_weight_max",
        "4.0"
      ]
    }
  }
}