Source camera identification method and device based on multi-scale feature fusion

The invention discloses a source camera identification method and device based on multi-scale feature fusion, and the method comprises the following steps: constructing a traceability model based on multi-scale feature fusion, which comprises a multi-scale feature extraction module, a feature fusion module and a classifier; supervised learning is performed on the traceability model by using the training image set, and a multi-scale feature extraction module and a feature fusion module after supervised learning are extracted to form a feature extractor; extracting a high-dimensional vector of each test image in the test image set by using a feature extractor, and constructing a camera fingerprint database by taking the high-dimensional vectors as fingerprint indexes of source camera categories corresponding to the test images; and extracting the high-dimensional vector of the to-be-detected image by using the feature extractor, performing matching retrieval based on the high-dimensional vector and the fingerpr