FurNets ImageQualityCheck API Legend

1. Quality Scoring Scale

Score Range	Category	Recommended Use Case
14-17	Excellent	Shows, breeding documentation, advertising
10-13	Good	Kennel websites, social media, catalogs
6-9	Average	Personal archives, reference materials
0-5	Poor	Not suitable for evaluation purposes

2. Category-Specific Characteristics

Excellent (14-17 points)

• Fur Texture:
  • Clear separation of guard hairs and undercoat (glcm_contrast > 150)
  • Visible “fluffiness” and volume (image_entropy > 0.9)
• Sharpness:
  • Crisp hair definition (variance_of_laplacian > 1500)
  • No visible halos or oversharpening (tenengrad < 30,000)
• Compression:
  • Minimal blocking artifacts (blockiness < 5)
  • No noticeable blur (jnb < 0.2)

Good (10-13 points)

• Fur Texture:
  • Partial undercoat visibility (glcm_contrast 100-150)
  • Moderate texture complexity (image_entropy 0.8-0.9)
• Sharpness:
  • Slight softness in detailed areas (variance_of_laplacian 500-1500)
• Compression:
  • Minor 8×8 pixel blocks in backgrounds (blockiness 5-10)
  • Localized blur in complex patterns (jnb 0.2-0.3)

Average (6-9 points)

• Fur Texture:
  • “Plastic” appearance without volume (glcm_contrast 50-100)
  • Significant texture loss (image_entropy 0.7-0.8)
• Sharpness:
  • Visible softness throughout (variance_of_laplacian 100-500)
• Compression:
  • Noticeable 8×8 pixel blocks (blockiness 10-20)
  • “Soapy” effect in fur (jnb 0.3-0.4)

Poor (0-5 points)

• Fur Texture:
  • Homogeneous mass without definition (glcm_contrast < 50)
  • Complete texture loss (image_entropy < 0.7)
• Sharpness:
  • Severe blurring (variance_of_laplacian < 100)
• Compression:
  • Dominant 16×16+ pixel blocks (blockiness > 20)
  • “Watercolor” artifacts (jnb > 0.4)

3. Critical Parameters for Spitz Evaluation

Parameter	Excellent	Poor	Impact Weight
Blockiness	<5	>20	25%
GLCM Contrast	>150	<50	30%
Variance of Laplacian	>1500	<100	20%
JNB	<0.2	>0.4	15%
Image Entropy	>0.9	<0.7	10%

4. Case Studies

High-Quality Example (16 pts – Excellent)
File from training set

Key metrics:json

"blockiness": 3.4, 
"variance_of_laplacian": 22.3,  // Optimal for balanced quality
"jnb": 0.18

Visual: Perfect “powder-puff” texture with individual hair visibility

Low-Quality Example (2 pts – Poor)
File from training set

Key metrics:

"blockiness": 40.0,  // Critical compression artifacts
"glcm_contrast": 859.7  // Indicates oversharpening

Visual: Artificial texture with blocking artifacts