JPEG image encryption method based on similar coefficient scrambling
An encryption method and coefficient technology, which is applied in the field of image processing, can solve problems such as system complexity, and achieve the effect of large key space, high compression rate, and high efficiency
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[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0034] The present invention provides a kind of encryption method that maintains JPEG image quality and compression rate, is used for encrypting JPEG image, see figure 1 , the inventive method comprises the steps:
[0035] Step 1: Read in the JPEG image file data stream. Obtain image size, quantization table, Huffman encoding table and other information from the file header of the JPEG image file, and obtain the file body data of the JPEG image, that is, the image data compressed by JPEG encoding.
[0036] Step 2: Decode the JPEG image data through the Huffman encoding table of the JPEG image file. The main part of the JPEG image data is quantized DCT coefficient encoding, so the quantized DCT coefficient matrix is obtained after decoding. In this matrix, most of the coefficients are zero, and a small number of coefficients with strong co...
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