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207results about How to "Quick delete" patented technology

Character extracting method in digital video based on character segmentation and color cluster

The invention relates to a character extracting method in a digital video based on character segmentation and color cluster, which comprises the following steps: (1) character segmentation: utilizing the characteristic differences of a character area and a character interval area to carry out vertical projection to segment images in the character area, namely, segmenting each row of area image containing a plurality of characters into a plurality of subarea images only containing a single character so as to reduce the post operating and treating difficulties and improve the identifying accuracy rate of OCR; and (2) character extraction: firstly, using the character color characteristic in the image to cluster colors, finding out an image layer containing maximum character information as a target image layer, and deleting the background area; and then, using the communicating characteristics of the characters to analyze a communicating area of the target image layer, and removing non-character areas to obtain such three results as single character images, an integral image of the character area and an integral image spliced by the single character images respectively, wherein all the three results are input to an OCR system to be identified, and the latter two results use the semantic processing function of the OCR and can accurately determine the characters with similar forms according to the context to improve the identifying effect.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Android-based Handler memory leakage prevention device and method

The invention provides an Android-based Handler memory leakage prevention device comprising: an asynchronous Runnable request receiving module used for receiving Runnable requests of asynchronous tasks; a synchronizing module used for synchronizing all received Runnable requests of the asynchronous tasks by adopting a weak quotation method; an asynchronous request execution module used for executing the Runnable requests of the asynchronous tasks and judging whether a message needs to be sent; a sub-line thread execution termination module used for terminating a sub-line thread if there is no message to be sent; a message sending module used for sending a message and a weak quotation relationship between the message and an asynchronous thread when the message needs to be sent; and a message distribution module used for storing the message and the weak quotation relationship between the message and the asynchronous thread and sending the same to a main thread for processing according to the time sequence of the message. According to the Android-based Handler memory leakage prevention device provided by the invention, the weak quotation relationship is introduced to ensure that resources can be smoothly recycled by a garbage collector, and no memory leakage is generated in the case of normal communication of the sub-thread and the main thread.
Owner:WUHAN DOUYU NETWORK TECH CO LTD

Group signature system based on quantum keys

The invention discloses a group signature system based on quantum keys. The group signature system comprises a quantum key generator, a signature key, a quantum group key generator, a group key, a quantum group signature module, a group signature and a quantum group signature verification, wherein the quantum key generator is a quantum sequence device generated by a laser source, and is used for forming a shared key of a newly-added group member and a group administrator; the quantum group key is issued to group members by the group administrator and used for encryption in signing according to a quantum state sequence generated by means of the quantum group key generator, and different sequences are generated according to different business transactions; and the quantum group signature module is used for performing quantum encryption on messages and signatures by the group members. The group signature system based on the quantum keys has the significant advantages that: identities are determined through distribution and measurement of the quantum keys, the efficiency is higher while the security is improved, and group members can be added and deleted quickly; and the group signature system is more suitable for a complex group signature environment, has the features of unlinkability and coalition attack resistance, and can realize coalition signature of a plurality of the group members.
Owner:CHINA THREE GORGES UNIV

Short message revocation method in sending process of mobile phone short message

The invention discloses a short message revocation method in a sending process of a mobile phone short message. The short message revocation method comprises the following steps: step A, a mobile phone sending terminal edits the short message and inserts a mobile phone information identification code and an operation order at the same time; step B, a mobile phone receiving terminal receives the short message; step C, the mobile phone sending terminal inserts a matching information identification code into the edited short message and sends the edited short message to a mobile phone receiving terminal; and step D, the mobile phone receiving terminal receives the short message containing the matching information identification code, and compares the short message containing the matching information identification code with the short message which is received previously. If the short message containing the matching information identification code is identical to the short message which is received previously, operation is conducted according to the operation order; otherwise the operation order is refused. Compared with the prior art, on the condition that the short message is sent by mistake, the short message revocation method enables the sent short message to be deleted, revoked or covered rapidly, and the conditions that important information is leaked and misunderstandings occur can be avoided effectively.
Owner:SHENZHEN GIONEE COMM EQUIP
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