本文讨论了建立四反射镜环形反馈系统的有关问题，探讨了利用环形反馈系统控制图象对比度变化的原理。
This paper studies the establishment of four-mirror circle feedback system and the principle of controlling contrast changes of the image pattern by this system.
由于在线掌纹图象的对比度较低，掌纹中的细小皱纹和乳突纹会形成一定的噪声，掌纹中的线特征的模式十分复杂，因此对掌纹进行线特征提取是一项具有挑战性的研究课题。
Line patterns in palmprint are very complicated because of the low contrast and the heavy noise caused by fine wrinkles and ridges, so it is a challenging task to complete the feature extraction.
实验表明，这种新方法能极大程度地消除金属伪影，并能显著提高图象的对比度。
Experiments show that by our method, the streaks caused by the metallic implants can be greatly suppressed and the contrast can be significantly improved.
它并没有处理效率与高对比度和宏观图象。
It fails to deal efficiently with high contrast and macro images.
结论组织谐波显像能明显提高图象的反差及对比度，改善图象质量，使泌尿系结石的阳性显示率和诊断准确性明显提高。
Conclusions the tissue harmonic imaging evidently improves the contrast and imaging quality, so that the positive rate and diagnostic accuracy of calculus would be upgraded.
通过该系统可以实现照片的自动切割提取、自动倾斜校正，并实现图象亮度、对比度调整，裁剪、旋转、缩放等功能。
Through this system, it is able to cut and extract photo information automatically, correct slant quickly, adjust luminance and chrominance, cut and rotate pictures, and make ratio prints.
用这种技术得到的实验结果显示这项技术在象的对比度方面比直接得到的象有很大提高。
Experimental results obtained with this technique show substantial improvement in image contrast over that obtained via direct imaging.
为了在相干象增强系统中提高象的对比度，突出所需用的信号，采用了偏振滤波器。
In order to improve the image contrast and to single out the desirable signals in a coherent image enhancement system, a polarizing filter was used.
该图象去噪方法同传统的中值滤波、高斯滤波相比，具有保形、保对比度的特点。
To compare with traditional medial filter and Gaussian filter, the image denoising method based on set operator has the characteristics of shape preserving and contrast invariant.
此方法既扩大了图象灰度的动态范围，又使得图象中的局部对比度得到了增强。
A new contrast enhancement technique is presented, which can not only extend the dynamic scope of the image gray scale, but also increase the local image contrast.
结果表明，获得的辐射图象的对比度足以识别出所研究的目标。
It is shown that the contrast of the radiometric images obtained is sufficient for the identification of the objects of interest.
与普通算法相比，这个改进算法最终获取令人满意的高清晰度和高对比度血管图象序列。
In comparison with general subtraction algorithm, this improved subtraction algorithm finally acquired a satisfactory sequence of DSA vascular images with high contrast and high definition.
与普通算法相比，这个改进算法最终获取了令人满意的高清晰度和高对比度血管减影图象序列。
In comparison with general subtraction algorithm, this improved subtraction algorithm finally acquired a satisfactory sequence of DSA vascular images with...
与普通算法相比，这个改进算法最终获取了令人满意的高清晰度和高对比度血管减影图象序列。
In comparison with general subtraction algorithm, this improved subtraction algorithm finally acquired a satisfactory sequence of DSA vascular images with...
应用推荐