Update README

Author: timerring

README.md

@@ -9,7 +9,7 @@ Matlab function basics and introductory tutorials for digital image processing.
 | [灰度直方图及直方图均衡化](https://github.com/timerring/digital-image-processing-matlab/blob/main/02_gray_histogram_and_histogram_equalization.md) | [直方图的显示](https://github.com/timerring/digital-image-processing-matlab/blob/main/02_gray_histogram_and_histogram_equalization.md#1直方图的显示)  \|  [计算并绘制图像直方图](https://github.com/timerring/digital-image-processing-matlab/blob/main/02_gray_histogram_and_histogram_equalization.md#2计算并绘制图像直方图)  \|  [直方图均衡化](https://github.com/timerring/digital-image-processing-matlab/blob/main/02_gray_histogram_and_histogram_equalization.md#3直方图均衡化) |
 | [图像的傅立叶变换](https://github.com/timerring/digital-image-processing-matlab/blob/main/03_fourier_transform_of_an_image.md) | [利用MATLAB 实现数字图像的傅立叶变换](https://github.com/timerring/digital-image-processing-matlab/blob/main/03_fourier_transform_of_an_image.md#利用matlab-实现数字图像的傅立叶变换)  \|  [空域滤波与频域滤波](https://github.com/timerring/digital-image-processing-matlab/blob/main/03_fourier_transform_of_an_image.md#空域滤波与频域滤波) |
 | [图像的滤波与图像增强](https://github.com/timerring/digital-image-processing-matlab/blob/main/04_image_filtering_and_image_enhancement.md) | [用滤波器祛除图象噪声](https://github.com/timerring/digital-image-processing-matlab/blob/main/04_image_filtering_and_image_enhancement.md#a-用滤波器祛除图象噪声)  \|  [空间噪声滤波器](https://github.com/timerring/digital-image-processing-matlab/blob/main/04_image_filtering_and_image_enhancement.md#b-空间噪声滤波器)  \|  [用滤波器祛除图象噪声](https://github.com/timerring/digital-image-processing-matlab/blob/main/04_image_filtering_and_image_enhancement.md#c用滤波器祛除图象噪声) |
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+| [Matlab实现彩色图像的转换、平滑、锐化与分割](https://github.com/timerring/digital-image-processing-matlab/blob/main/05_conversion_smoothing_sharpening_and_segmentation_of_color_images.md) | [使用 RGB、索引和灰度级图像间转换的函数](https://github.com/timerring/digital-image-processing-matlab/blob/main/05_conversion_smoothing_sharpening_and_segmentation_of_color_images.md#1使用-rgb索引和灰度级图像间转换的函数)  \|  [彩色图像平滑的MATLAB 仿真](https://github.com/timerring/digital-image-processing-matlab/blob/main/05_conversion_smoothing_sharpening_and_segmentation_of_color_images.md#2掌握彩色图像平滑的matlab-仿真)  \|  [彩色图像锐化](https://github.com/timerring/digital-image-processing-matlab/blob/main/05_conversion_smoothing_sharpening_and_segmentation_of_color_images.md#3彩色图像锐化)  \|  [RGB 彩色图像分割](https://github.com/timerring/digital-image-processing-matlab/blob/main/05_conversion_smoothing_sharpening_and_segmentation_of_color_images.md#4rgb-彩色图像分割) |
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