为了满足实际应用的需求，有时候需要对遥感影像进行增强处理。本文获取的流

In order to meet the needs of practical applications, it is sometimes necessary to enhance remote sensing images. The watershed TM image obtained in this paper is a bit darker, the grayscale distribution range is narrow, and the contrast of the ground object spectrum is not large. Therefore, the image must be enhanced to make the ground object features in the image more obvious, which is helpful for subsequent classification. Research and environmental information extraction. <br>The enhancement process adopts the method of linear stretching, which is specifically completed by the Ehance tool under Ehance in the image display window of the ENVI software. Figure 2 shows the comparison of remote sensing image effects before and after linear stretching. It can be seen from the comparison chart that after the stretching process, the brightness of the image is enhanced, and the contrast is also strengthened accordingly. Reflecting the difference of features is also more obvious. The enhanced image is more conducive to subsequent research use.

In order to meet the needs of practical applications, it is sometimes necessary to enhance the processing of remote sensing images. In this paper, the watershed TM image tone is somewhat dark, the grayscale distribution range is narrow, the contrast between the earth's spectrum is not big, so the image should be enhanced, so that the characteristics of the earth in the image is more obvious, which is helpful to the subsequent classification research and environmental information extraction.<br>The enhancement process is done using a linear stretching method, using the Liner 0-255 tool under The Ehance, which displays the window in enVI software. Figure 2 shows a comparison of remote sensing images before and after linear stretching. As can be seen from the comparison diagram, after stretching, the brightness of the image is enhanced and the contrast is enhanced accordingly. The differences reflecting the ground are also more pronounced. Enhanced imagery is more conducive to subsequent research.

In order to meet the needs of practical application, sometimes it is necessary to enhance the remote sensing image. In this paper, the TM image of the watershed is dark, the gray distribution is narrow, and the contrast of the ground object spectrum is not big. Therefore, the image should be enhanced to make the features of the ground object more obvious, which is helpful for the subsequent classification research and environmental information extraction.<br>The enhancement process uses the linear stretching method, which is completed by using the liner 0-255 tool in the image display window of envi software. Figure 2 shows the effect comparison of remote sensing images before and after linear stretching. As can be seen from the contrast map, the brightness and contrast of the image are enhanced after stretching. The difference of reflecting surface features is more obvious. The enhanced image is more convenient for follow-up study.<br>