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Switching median filtering based encrypted image denoising method

A technology for encrypting images and images, applied in image enhancement, image data processing, instruments, etc., can solve problems such as unsatisfactory effects, and achieve good image denoising quality, correct detection, and good quality effects

Inactive Publication Date: 2013-01-30
CHONGQING UNIV
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Problems solved by technology

It can be seen that the threshold of each window is fixed, which is not ideal for images with large differences in pixel values.

Method used

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  • Switching median filtering based encrypted image denoising method
  • Switching median filtering based encrypted image denoising method
  • Switching median filtering based encrypted image denoising method

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Embodiment Construction

[0048] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0049] figure 1 The overall block diagram of the encrypted image denoising method based on the switch median filter provided for the embodiment of the present invention is shown in the figure: the system block diagram of the encrypted image denoising method based on the switch median filter of the present invention consists of 3 functional modules Composition: (1) image encryption (implemented by the image owner); (2) image denoising (implemented by the image denoising party); (3) image decryption (implemented by the image receiver).

[0050] figure 2 The image encryption process provided by the embodiment of the present invention specifically includes the following s...

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Abstract

The invention discloses a switching median filtering based encrypted image denoising method, which belongs to the field of multimedia information security and image processing. The method involves an image owning party, an image denoising party and an image receiving party, the image owning party has a noisy image, and hopes to denoise the image by the image denoising party and then transmit the image to the image receiving party, but because the image owning party distrusts the image denoising party, after the image is encrypted, the image owning party transmits the image with covered contents to the image denoising party to process. The method comprises the following steps: firstly, carrying out encryption on the image by using a particular image encryption method, and due to the particularity of the encrypted image, carrying out denoising processing on the image by using a non-traversing switching median filtering; firstly, dividing the image into blocks, and finding the mean value, standard deviation and mid-value of each block; then, obtaining a threshold according to the standard deviation, and determining a noise point; and finally, replacing the pixel value of the noise point with the mid-value. The method disclosed by the invention not only effectively realizes the image denoising, but also protects the information security of images.

Description

technical field [0001] The invention relates to the fields of multimedia information security and image processing, in particular to a denoising method for noise image data in an encryption domain. Background technique [0002] Encryption technology is a technology that converts plaintext images into incomprehensible ciphertext images through certain transformation operations, and is widely used in occasions such as confidential transmission and storage of medical images, criminal investigation charts, and military images. At present, there are many image encryption technologies, such as pixel scrambling technology, image encryption technology based on secret segmentation and secret sharing, image encryption technology based on modern cryptography system, etc. The present invention adopts pixel scrambling technology. Pixel scrambling technology pseudo-randomly scrambles the positions of image pixels according to the key to hide the image content. Since the scrambling opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04L9/32
Inventor 张思杰喻洁沈凯捷殷悦石岭徐鹏翟丽红
Owner CHONGQING UNIV
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