Embedded device and method for rapidly detecting whether JPEG picture files are right or not

Abstract

The invention provides an embedded device and method for rapidly detecting whether JPEG picture files are right or not. The embedded device comprises an initialization unit for initializing five Marker section counters including SIO / DQT / SOF / DHT / SOS, an obtaining unit for obtaining the size of the JPEG files and reading JPEG streaming files, a scanning unit for scanning Marker sections and a processing unit, wherein the initialization unit, the obtaining unit, the scanning unit and the processing unit are sequentially connected. By means of the embedded device and method for rapidly detecting whether the JPEG picture files are right or not, whether formats of the JPEG files are right or not can be judged at an extremely-high speed, and hardware decoding or a software decoding library do not need to be modified for the JPEG files with wrong contents.

Description

technical field [0001] The invention relates to an embedded device and method for quickly detecting whether a JPEG image file is correct. Background technique [0002] The use of multimedia data on embedded devices often uses JPEG images, and the JPEG format has a few error-tolerant designs because of the various versions defined in the specification, but it does not have an error-proof design like the PNG format. It is so easy to be fault-tolerant (critical chunks in PNG format have CRC (cyclic redundancy check) to judge whether there is an error in the data in the stored data chunks). However, due to storage media storage or network transmission of embedded devices, the data content may be damaged or changed. For example, after iNand media storage is erased or read for a certain number of times, the stored content may change. Although there is ECC in the Page in NAND to check and correct a certain bit of data error, it still cannot guarantee 100% no change. content. If ...

AI Technical Summary

Problems solved by technology

[0002] The use of multimedia data on embedded devices often uses JPEG images, and the JPEG format has a few error-tolerant designs because of the various versions defined in the specification, but it does not have an error-proof design like the PNG format. It is so easy to be fault-tolerant (critical chunks in PNG format have CRC (cyclic redundancy check) to judge whether there is an error in the data in the stored data chunk)

However, due to reasons such as storage of embedded devices or network transmission, the data content may be damaged or changed.

For example, after iNand media storage is erased or read for a certain number of times, the stored content may change. Although there is ECC in the Page in NAND to check and correct a certain bit of data error, it still cannot guarantee 100% no change. content

If there is an error in the content of the JPEG picture, you can only rely on the decoding software or hardware to handle JPEG exceptions, and different hardware decoding chips or decoding library software do not handle errors comprehensively, that is, use JPEG pictures with incorrect content. For display, often due to incomplete fault-tolerant processing, decoding exceptions (exception) occur

However, if you want to handle software decoding fault tolerance comprehensively, it often takes a lot of manpower to modify the decoding library, and hardware modification fault tolerance also requires greater hardware development costs.

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