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Open-Vocabulary Semantic Segmentation with Mask-adapted CLIP

Authors :
Liang, Feng
Wu, Bichen
Dai, Xiaoliang
Li, Kunpeng
Zhao, Yinan
Zhang, Hang
Zhang, Peizhao
Vajda, Peter
Marculescu, Diana
Publication Year :
2022

Abstract

Open-vocabulary semantic segmentation aims to segment an image into semantic regions according to text descriptions, which may not have been seen during training. Recent two-stage methods first generate class-agnostic mask proposals and then leverage pre-trained vision-language models, e.g., CLIP, to classify masked regions. We identify the performance bottleneck of this paradigm to be the pre-trained CLIP model, since it does not perform well on masked images. To address this, we propose to finetune CLIP on a collection of masked image regions and their corresponding text descriptions. We collect training data by mining an existing image-caption dataset (e.g., COCO Captions), using CLIP to match masked image regions to nouns in the image captions. Compared with the more precise and manually annotated segmentation labels with fixed classes (e.g., COCO-Stuff), we find our noisy but diverse dataset can better retain CLIP's generalization ability. Along with finetuning the entire model, we utilize the "blank" areas in masked images using a method we dub mask prompt tuning. Experiments demonstrate mask prompt tuning brings significant improvement without modifying any weights of CLIP, and it can further improve a fully finetuned model. In particular, when trained on COCO and evaluated on ADE20K-150, our best model achieves 29.6% mIoU, which is +8.5% higher than the previous state-of-the-art. For the first time, open-vocabulary generalist models match the performance of supervised specialist models in 2017 without dataset-specific adaptations.<br />Comment: CVPR 2023. Project page: https://jeff-liangf.github.io/projects/ovseg

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2210.04150
Document Type :
Working Paper