In the paper a single channel color image encryption method based on compressed sensing (CS) was proposed. Firstly, a color image was modulated to the gray images by using a tricolor grating, and then the spectrum of the gray images was encrypted by applying CS technology, and regards the measurement matrix as a key. Decryption by choosing suitable filtering window, extract the R, G, B gray image spectrum reconstruction, finally achieved the reconstruction of the original color image. The simulation results indicate that this encryption method can effectively reduce the amount of sampling data, reduce the burden of subsequent storage, transmission and processing information. At the same time, it can increase the key space, and effectively improve the security of encryption.
Partial coherence is one of the important parameters for evaluating the performance of lithographic tool. In this paper, we present a novel method of partial coherence measurement for the illumination system based on CCD image sensor. Partial coherence measurement can be performed by using a pinhole placed in the mask plane under different illumination system. We simulate the light source image of different illumination pupil distributions as well as the energy center by determining the gray value of spot. We show measurement values and measurement errors of partial coherence for illumination system. The statistics of the measurement results and the sensitivity analysis of the system indicate that measurement values and measurement errors of partial coherence satisfy the measurement requirement from our method in the wafer plane.
The image super-resolution technology has a wide range of applications and development prospects due to hardware limitation and various kinds of degradations of the digital imaging system. However, it is a difficult problem to share and promote it based on the rapid development of web technology. In this paper, we proposed a scheme to apply the technology of image super-resolution in intelligent mobile terminal by sharing way. Firstly, the algorithm of single image super-resolution reconstruction based on Compressed Sensing is proposed and deployed to the Cloud Host in the server terminal. Then, the service background is built by using the thinkPHP framework and the site operation environment is constructed combined with the XAMPP toolkit, so the algorithm can be called and run by the script files of batch processing. Correspondingly, in intelligent mobile terminal, the preprocess image can be uploaded asynchronously to the Apache Server of the Cloud Host through designing the plugin by HTML5. In addition, the plugin of the Boostrap is used and the concept of Responsive Web Design is utilized subsequently, so the mobile terminal has good interactivity. Finally, image super-resolution can be done by interrupt request, and the result can be obtained dynamically in intelligent mobile terminal. Experimental results indicate that this scheme makes it possible to apply the latest theory in mobile terminal, which is feasible to solve the problem of poor quality of image in the field of engineering where the imaging process is not ideal.
In this paper, an information hiding method using decimal expansion of irrational numbers to generate random phase mask is proposed. Firstly, the decimal expansion parts of irrational numbers generate pseudo-random sequences using a new coding schemed, the irrational number and start and end bit numbers were used as keys in image information hiding. Secondly, we apply the coding schemed to the double phase encoding system, the pseudo-random sequences are taken to generate random phase masks. The mean square error is used to calculate the quality of the recovered image information. Finally, two tests had been carried out to verify the security of our method; the experimental results demonstrate that the cipher image has such features, strong robustness, key sensitivity, and resistance to brute force attack.
We have developed a new type of dual-wavelength transversely excited atmospheric pressure (TEA) CO2 laser that possesses space overlap and time synchronization. Our experiments have proven that the time interval of two output pulses with different frequencies can be adjusted from 1000 ns to 200 ns. In this way, the requirement of dual-wavelength excitation in a material can be achieved for isotope separation purposes. This TEA CO2 laser contains a grating-plate cavity formed by one germanium plate and two gratings, where the two gratings partially overlap in the space. The gratings, which are placed in tandem, are mutually beneficial via the germanium plate and establish double-frequency oscillation. The dual-wavelength laser is exported from the germanium plate. It is a changing of the effective area of two gratings that enables us to adjust the space overlap of the two output pulses. By simultaneously adjusting the quantity of misalignment in the gratings angle to vary the spectral line geometry loss, which can be used to reduce the time interval of the two output pulses, a time synchronization can be achieved.
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