Impact of Binary-Valued Representation on the Performance of Cross-Modal Retrieval System

The tremendous proliferation of Multi-Modal data and the flexible need of users has drawn attention to the field of Cross-Modal Retrieval (CMR), which can perform image-sketch matching, text-image matching, audio-video matching and near infrared-visual image matching. Such retrieval is useful in many applications like criminal investigation, recommendation systems and person reidentification. The real challenge in CMR is to preserve semantic similarities between various modalities of data. To preserve semantic similarities, existing deep learning-based approaches use pairwise labels and generate binary-valued representation. The generated binary-valued representation provides fast retrieval with low storage requirement. However, the relative similarity between heterogeneous data is ignored. So, the objective of this work is to reduce the modality-gap by preserving relative semantic similarities among various modalities. So, a model named "Deep Cross-Modal Retrieval (DCMR)" is proposed, which takes triplet labels as the input and generates binary-valued representation. The triplet labels locate semantic similar data points nearer and dissimilar points far in the vector space. Extensive experiments are performed and the result is compared with deep learning-based approaches, which shows that the performance of DCMR increases by 2% to 3% for Image→Text retrieval and by 2% to 5% for Text→Image retrieval in mean average precision (mAP) on MSCOCO, XMedia, and NUS-WIDE datasets. So, the binary-valued representation generated from triplet labels preserve better relative semantic similarities than pairwise labels.