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由于彩色图片比黑白图片易于识别,所以,黑白图像的假彩色合成受到很大的注意。黑白图像的假彩色编码主要有两类技术,即按空间频率的编码和按密度的编码。目前,己有人研制成多种光学假彩色编码技术。利用白光系统作黑白图像的假彩色编码有其独特的优点。它不需要贵重的多色激光器,没有激光引起的散斑噪声,色彩鲜明。本文阐述了用矩形光栅作x—射线片密度假彩色编码的理论与实验。从频谱分析的观点出发,分析了用矩形光栅对图形进行编码时,它的高级谱所形成的像,与其零级谱所形成的像对比度相反的原理。解释了实现对比度反转的条件.给出了在白光系统中,对x—射线胸片和细胞切片编码的结果。
Because color pictures are easier to recognize than black and white pictures, false color compositing of black and white images is drawing a lot of attention. There are two main types of fake color coding for black and white images, namely coding by spatial frequency and coding by density. Currently, a number of optical false color coding technologies have been developed. The use of white light system for black and white image false color coding has its unique advantages. It does not require expensive multicolor laser, no speckle noise caused by laser, bright colors. This paper describes the theory and experiment of using rectangular grating for x-ray patch density false color coding. From the viewpoint of spectrum analysis, the principle that the image formed by the high-order spectrum of the rectangular raster is encoded is opposite to the contrast of the image formed by the zero-order spectrum. The conditions for achieving contrast inversion are explained, and the results of encoding x-ray chest and cell sections in a white light system are given.