The subtle color distinction is the important function of electronic endoscope imaging diagnosis. However, after image acquisition, transmission and display, color distortions of intracorporeal organs or tissues occur inevitably, which are adverse to analyze image features accurately or to diagnose early pathological changes. A real-time color correction algorithm based on fourneighborhood and polynomial regression in YUV color space is proposed. Based on polynomial regression the color correction matrix is calculated in YUV color space according to the differences between standard values of color checker and measured values of that imaged by the endoscope. As the correction is only executed on U and V components in YUV color space, the defect that the color of corrected images in RGB color space will change along with luminance can be avoided, and then the stability of image color is improved. Owing to four-neighborhood processing, the signal-to-noise ratio of corrected images is enhanced and the processing speed of correction algorithm is accelerated. The average color difference is reduced from 0.3944 to 0.2850 by application of the proposed algorithm in high-definition electronic endoscope. A total of 17 frames per second can be achieved at the resolution of 1280 × 800, and the color characteristics of the image after processing match that of human visual system.

为了解决轴角编码器尺寸与角度分辨率之间的矛盾，同时提高编码器的响应频率，提出了一种基于线阵探测器的单圈绝对式光电轴角编码器.该编码器使用了一种新型单圈绝对式编码盘，整个码盘只有一个码道，粗码被直接刻在这个单圈的码道上，码盘图像经光学放大后被线阵探测器接收.利用FPGA控制电路将数据传送至计算机，并对数据进行译码处理，分别利用图像处理技术读取粗码和利用像素细分技术获得细码，两者相结合得到角度信息.通过该技术设计一个码盘直径为40 mm的绝对式轴角编码器，其分辨率为15位.