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151 results about "Web image" patented technology

Semantic propagation and mixed multi-instance learning-based Web image retrieval method

The invention belongs to the technical field of image processing and particularly provides a semantic propagation and mixed multi-instance learning-based Web image retrieval method. Web image retrieval is performed by combining visual characteristics of images with text information. The method comprises the steps of representing the images as BoW models first, then clustering the images according to visual similarity and text similarity, and propagating semantic characteristics of the images into visual eigenvectors of the images through universal visual vocabularies in a text class; and in a related feedback stage, introducing a mixed multi-instance learning algorithm, thereby solving the small sample problem in an actual retrieval process. Compared with a conventional CBIR (Content Based Image Retrieval) frame, the retrieval method has the advantages that the semantic characteristics of the images are propagated to the visual characteristics by utilizing the text information of the internet images in a cross-modal mode, and semi-supervised learning is introduced in related feedback based on multi-instance learning to cope with the small sample problem, so that a semantic gap can be effectively reduced and the Web image retrieval performance can be improved.
Owner:XIDIAN UNIV

Concealed communication method

InactiveCN104917747ATransmission reachedLarge capacityTransmissionData packAlgorithm
The invention discloses a concealed communication method. The method comprises the following steps that encryption is performed on first original data on a sending end and a receiving end so as to form concealed information and generate a binary sequence of the concealed information, and the binary sequence is recorded as a sending-end original cipher; the binary sequence of the concealed information is converted into a sending-end Chinese character sequence and is sent to the receiving end; the receiving end receives the concealed information and carries out decryption. Through the above mode, by using the concealed communication method provided in the invention, a Chinese character coding is used to embed the concealed communication into a Chinese character; through analyzing the concealed information which needs to be transmitted, the concealed information is converted into English letters in a split-up mode and then are converted into a Chinese character; then the Chinese character is transmitted to a target site through forms of a mail, a webpage and a picture so that a purpose of transmitting the concealed information is reached. A concealed channel established by using the method possesses advantages of a high capacity and high concealed performance. In the method, the concealed information is packed and transmitted in a data portion of an IP data packet.
Owner:SUZHOU INST FOR ADVANCED STUDY USTC

Website picture tampering detection method based on deep learning

The invention relates to a website picture tampering detection method based on deep learning. The method comprises the steps of collecting a sample picture with a text, establishing a training set after preprocessing, training a corresponding network model, further training a semantic similarity detection model and constructing a sensitive word bank, crawling and preprocessing a website picture tobe detected, obtaining a text content result in the website picture through the network model, calculating the semantic similarity between the text content result and the sensitive word bank throughthe semantic similarity detection model after word segmentation, and judging whether the sensitive content and the website picture are tampered based on the similarity. The text block recognition precision is improved; the method is accurate in text extraction, small in model, high in convergence speed and good in performance, semantic recognition is carried out on texts in pictures, sensitive speech in webpage pictures can be accurately detected, whether a website is invaded by hackers or not can be quickly and efficiently recognized, an alarm is given in time, the method plays an important role in maintaining website safety, and spreading of bad illegal information can be blocked in time.
Owner:HANGZHOU ANHENG INFORMATION TECH CO LTD

Horrible image identification method and system based on visual significance analyses

The invention discloses a horrible image identification method and system based on visual significance analyses. The method comprises the steps that a training set containing horrible image samples and non-horrible image samples is built; visual significance analyses are conducted on each training sample image through an image significance analysis algorithm to acquire a visual significance image of each training sample image; each training sample image is divided into small W*W image blocks, virtual and affective characteristics are conducted on each image block, and virtual word histogram representation of each training sample image is acquired through a packet representation model based on visual significance; a classification model of horrible images is acquired through an acquired virtual word histogram of each training sample image and a label training support vector machine corresponding to the acquired virtual word histogram, and new testing image is identified through the classification model to judge whether the new testing image is a horrible image or not. The horrible image identification method and system based on visual significance analyses can be applied to the fields like horrible web image filtration and affective and semantic image recognition, and has wide application prospects.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
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