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图像的色彩复原是彩色图像采集系统的关键技术,决定了采集图像的质量。针对目前CMOS图像传感器广泛使用的Bayer格式图像,介绍了双线性插值法、梯度检测插值法和相关性插值法三种色彩复原算法;然后建立了基于Altera公司CycloneⅡ系列FPGA芯片的图像采集系统,并采用Verilog硬件描述语言在FPGA上实现了色彩复原算法。实验结果表明,该FPGA利用其丰富的内部硬件资源和并行处理的优势,能实时准确地完成色彩复原工作,同时,相关性插值法获得了最高峰值信噪比,恢复的彩色图像边缘清晰平滑。
Image color reproduction is the key technology of color image acquisition system, which determines the quality of the acquired image. Aiming at the widely used Bayer format image of CMOS image sensor, three color restoration algorithms are introduced, such as bilinear interpolation method, gradient detection interpolation method and correlation interpolation method. Then the image acquisition system based on Cyclone II FPGA of Altera Company is established, And using Verilog hardware description language on the FPGA to achieve a color recovery algorithm. The experimental results show that the FPGA can take advantage of its rich internal hardware resources and parallel processing to complete the color restoration work in real time. Meanwhile, the correlation peak value achieves the highest peak signal-noise ratio and the edge of the recovered color image is clear and smooth.