查询词典 just noticeable difference

If the various gray information,which are acquired in a scotopic condition and can not be resolved by human vision is put to the gray level of the just noticeable difference, the human vision contrast resolution in the scotopic condition can be nonlinearly compensated.

将在暗视觉条件下所获得的人类视觉不能分辨的不同灰度的信息，放在恰可分辨的灰度水平上，进行非线性补偿。

Plus lenses were added in 0.12 d steps until subjects reported a just noticeable difference in blur.

目的 分析不同屈光组模糊阈值之间的差异，探讨模糊阈值在近视发生发展中的可能作用机制。

The deduced just noticeable difference on natural image content can be used to normalize these four attributes and to further explore the image quality model.

利用实验结果可以将色彩度、亮度、对比度和清晰度等因素进行归一化和量化，从而建立包含上述4种因素的图像质量模型。

Based on characteristics of human visual system, including texture/contract masking property and sensitivity of frequency, and combining with wavelet multi-resolution theory, a novel just noticeable difference model that can embed watermark adaptively is proposed.

用该模型可使指纹特征信息生成的数字水印自适应嵌入合成的指纹图像中，提高了指纹认证系统的可信度。

In this ***, we also show how to compute a perceptual matrix about the Just Noticeable Difference based on Watson model. Then, according to the matrix, we develop two new algorithms of digital watermark based on Discrete Cosine Transform. In the last part of this chapter, we use some experiments to validate our algorithms.

在对Watson的视觉模型作了较为详细的描述的基本上，依据Watson模型并结合JPEG图像紧缩中常用的DCT变换及JPEG紧缩量化表，提出了基于Watson模型的DCT域低频与中频数字水印算法，并给出试验结果。

Study of contrast sensitivity of the human eye shows that logarithm curve obeys the Weber-Fechner law of just noticeable difference response in human perception.

关於寻找最小有效剂量的统计方法，一般而言，会先确定所采用的检定统计量，再依据封闭降阶的方式侦测最小有效剂量。

The proposed algorithm comprehensively considers the effects of local area average brightness of the background and space complexity on visual resolution. In order to judge whether the variance of gray is effectively percepted or not, the just noticeable difference is derived. The changes in the number of perceptible pixels between the original image and the enhanced image can be calculated by use of JND parameter. Thus quantitative results to assess the quality of enhanced images are obtained.

算法综合考虑图像局部区域的背景平均亮度和空间复杂度对视觉分辨力的影响，导出了用于判断局部灰度级跃变是否被有效感知的重要参数―临界可见偏差JND，并利用此参数分别计算出图像增强前后有效感知像素数的变化情况，从而定量地给出图像增强质量的评价结果。

Unlike the common just noticeable difference study, the JNDs on natural image content by human eyes under general viewing conditions are evaluated.

与以往JND研究不同，针对视频显示应用，研究了在一般观测条件下，友眼观测自然图片时上述4种图像质量影响因素的JND值。

Differential threshold: The minimal difference that can be detected between two similar stimuli it called the differential threshold, or the just noticeable difference.

差别感受阈限：刚刚能够察觉的刺激物的最小差别量被称为差别感觉阈限，或最小差别感受阈限。

The BCH coded authentication data is modulated by chaotic sequence and then embedded into the DCT domain of the image by using the owner's private key.The embedding process is controlled by Just Noticeable Difference of the DCT block.Users can extract the authentication data with the public key,while they can't get the private key to destroy or delete the watermark through the public key.

提出一种基于非对称水印的图像认证改进算法，算法中将经过BCH编码和混沌序列调制的认证信息作为水印，利用所有者私钥嵌入图像DCT域，嵌入过程根据DCT块的可视噪声阈值控制，用户可以利用公钥从水印图像中提取认证信息，但无法从公钥中获取任何私钥信息，从而无法破坏或删除水印。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

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镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。