A content-based image file engraving method
An image file and engraving technology, which is applied to the generation of response errors, error detection of redundant data in calculations, etc., can solve problems such as fragmentation and engraving methods that cannot work normally, and achieve high accuracy.
Inactive Publication Date: 2017-01-04
DALIAN UNIV OF TECH
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Limited to the physical characteristics of NAND flash memory devices, the file storage on it is not continuous, but fragmented, which will make the existing engraving methods unable to work properly
So far, little research has been done on file engraving methods on this device
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0036] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solution and the drawings.
[0037] Attached figure 1 It is a flowchart of the engraving process of the present invention, attached figure 2 It is a schematic diagram of calculating the forward matching distance of data blocks. The figure on the right represents a JPEG image, which is composed of two upper and lower data blocks, and 9 squares represent 9 minimum coding units. The boundary between the two data blocks occurs in the smallest coding unit No. 5, that is, the data of the upper and lower data blocks is required to obtain the smallest coding unit No. 5. The graph on the left is an enlarged view of the graph on the right, and each small square in the smallest coding unit represents a pixel. According to formula (3), the pixels included in calculating the forward matching distance of the lower data block are the pixels marked in dark in the figure....
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an image file carving restoration method based on contents, belongs to the technical fields of information safety and computer application, relates to a Joint Photographic Experts Group (JPEG) image file restoration method and in particular relates to a method for restoring a JPEG image file which is deleted from a data storage device already and of which the related file system metainformation is damaged. The carving restoration method comprises the steps of firstly, obtaining an ordered set of all data blocks of a storage device requiring the carving restoration operation by use of a related interface provided by an operating system, secondly, carrying out preprocessing to obtain a set of data block to be restored by carving, and finally, performing carving restoration on the set of data block to be restored by carving. The carving restoration method is applicable to data storage devices including an NAND flash memory, is not affected by the existence of a file system or not, and is high in accuracy rate. The carving restoration method is capable of operating normally on a non-continuous storing data storage device in which a traditional algorithm is incapable of operating, and also capable of helping the related personnel with restoring important JPEG image data in the fields of criminal investigation and data restoration.
Description
Technical field [0001] The invention belongs to the technical field of information security and computer application, and relates to a method for restoring JPEG image files, in particular to a method for restoring JPEG image files that have been deleted in a data storage device and related file system meta-information is destroyed. Background technique [0002] In the process of criminal investigation and data recovery, recovering the original files from the data storage device is an important step. This process is called engraving. The data storage device refers to the external memory that stores binary data in the computer system. The most widely used data storage device in modern computers is the hard disk. On the hard disk, the operating system tends to store the file data blocks continuously. Therefore, after the file system is damaged or the file is deleted by mistake, the original file data can be restored through the continuous logical address of the hard disk. JPEG is ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14
Inventor 孔祥维张博
Owner DALIAN UNIV OF TECH