【摘要】 <正> 以往获得标准假彩色图象的处理方法,是采取对7、5、4波段分别进行反差增强,然后再做彩色合成,或者先合成,再做反差增强。这种方法对一些地区、一些季节的图象是可行的,但对另一些地区(如西藏、青海、新疆等),特别是在三个波段间相关性强的条件下,其处理效果是很差的。“二次增强”的处理方法,虽对图象质量有明显改进,但仍然是更多还原

【Abstract】 The experience in the past years or image processing snows a tew geological information in the plain area. Conventional contrast enhancement gives monotonous hue that would not reflect geological subject properly. Authors suggest performance of enhancement at spectral dimensions. The nature of suggested technique is extension of the differences in the brightness values of named pixel at the three spectral dimensions which are involved in the composition that makes the named pixel more bright-colored, i.e color-enhanced. Such processing method changes the subtle differences between the brightness of the diverse objects in the image into obvious differences in the colors. The geological information can be enhanced in this way.Performance of spectral-dimension enhancement requires two terms. The first is that the brightness values of the named pixel must maintain the same relationship, i.e, the bigger value must be remained bigger after enhancement; the second, sum of the brightness values at the three dimensions must be remained the same as before enhancement, so that the only operation in the enhancement is extension of the differences in the brightnesses at three spectral bands. Therefore, the method provides the specifications of a standard false color composite and, simultaneously, a bright-colored, information-enriched image.更多还原