As Docker container lacks the ability of limiting network bandwidth resources, a bandwidth control mechanism was proposed for Docker container network based on Traffic Control (TC). Firstly, based on the real-time monitoring mechanism of CGroups file system, Virtual File System (VFS) of Linux kernel was used as a medium to pass the network control parameters set when Docker container was created to the Linux kernel controller TC. Then, the Intermediate Functional Block device (IFB) module was introduced to archive uplink and downlink bandwidth control, and the parameters (rate, ceil and prio) were used to achieve idle bandwidth sharing and container priority control. Finally, the specific network limitations were conducted by controlling the TC, and flexible network resource control between containers was realized. The experimental results show that the proposed mechanism can effectively limit the actual container bandwidth within 2% fluctuation range in the container exclusive bandwidth scenario, and can precisely limit the network bandwidth of the container with average 0.5% error range in the shared idle bandwidth scenario. Meanwhile, the mechanism can flexibly manage resources based on priorities. With the advantage of providing a more native interface for Docker and requiring no additional tools, this mechanism can provide a convenient and effective solution for fine-grained elastic network resource control on Docker-based cloud platform.

Images captured in hazy weather suffer from poor contrast and low visibility. This paper proposed a single image defogging algorithm to remove haze by combining with the characteristics of HSI color space. Firstly, the method converted original image from RGB color space to HSI color space. Then, based on the different affect to hue, saturation and intensity, a defogged model was established. Finally, the range of weight in saturation model was obtained by analyzing original images saturation, then the range of weight in intensity model was also estimated, and the original image was defogged. In comparison with other algorithms, the experimental results show that the running efficiency of the proposed method is doubled. And the proposed method effectively enhances clarity, so it is appropriate for single image defogging.

Concerning the defect that the traditional filtering window cannot be adaptively extended and the standard mean filter algorithm could blur edges easily, a new adaptive weighted mean filtering algorithm based on city block distance was proposed. First, the noise points can be detected with switch filtering ideas. Then, for each noise point, the window was extended according to the city block distance, and the window size was adaptively adjusted based on the number of signal points within the window. Last, the weighted mean of the signal points in the window was taken as the gray value of the noise points to achieve the effective recovery of the noise points. The experimental results show that the algorithm can effectively filter out salt-and-pepper noise, especially for the larger-noise-density image, and denoising effect is more significant.