1. Abstract
The textile industry faces a critical bottleneck: the disconnect between raster-based creative workflows and vector-based production requirements. The Sapphire Vector Engine V3 introduces a novel "Shape-First" quantization approach, bridging this gap by utilizing a hybrid pipeline of Diffusion-based generation and geometric vectorization. This paper outlines the technical implementation of our 16x Upscale logic and the core Vectorizer module.
2. The 16x Upscale Pipeline
Standard upscaling models (ESRGAN, SwinIR) often fail on textile patterns due to hallucination of non-existent textures. Sapphire implements a two-stage pipeline to achieve production-ready 300 DPI outputs:
- Stage 1 (Structure Recovery): A modified Real-ESRGAN model trained specifically on repeat-pattern datasets. This stage performs a 4x upscale, focusing solely on edge reconstruction and artifact removal.
- Stage 2 (Detail Synthesis): A secondary proprietary model ("Sapphire Polish") applies another 4x expansion. Unlike generic models, this layer injects micro-contrast details simulating fabric weave, resulting in a total 16x resolution gain (Square Logic).
3. Vectorization & Color Quantization
Converting raster patterns to SVG often results in "blobby" shapes or excessive node counts. V3 utilizes a "Cell-Collapse" algorithm that proactively merges adjacent pixels of similar chromaticity before tracing.
3.1 Dynamic Palette Reduction
Before vectorization, the engine analyzes the image histogram to identify dominant textile colorways. Sub-dominant colors are mapped to the nearest "Production Safe" pantone equivalent to reduce print costs.