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Effects of magnification methods and magnifier shapes on visual inspection

机译：放大方法和放大镜形状对外观检查的影响

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This study investigated the effectiveness of the novel differential linear and differential nonlinear magnification methods, and the effects of magnifier shape and magnification power on visual search performance. With the differential magnification, objects that were more peripheral were scaled at a level higher than those in the vicinity of fixation. It was hypothesized that 1) owing to the ineffectiveness of scaling stimulus in the vicinity of fixation, the differential magnification methods would enhance magnification effectiveness and thereby improve inspection performance, and 2) because an elliptical lens shape resembles the shape of human visual field, for the same area of magnified view, an elliptical magnifier would be more effective than the circular one. In this study, objective performance measures of speed and accuracy and subjective workload evaluation using the NASA Task Load Index paradigm were used. The results showed that 4× magnification increased the overall inspection time as compared with 3× magnification, suggesting that a trade-off might have occurred between magnification and field size. The two hypotheses were not confirmed; however, a number of questions arose which need further investigation. Discussions of the concerned questions were made on i) the unfamiliarity of subjects with the new differential magnification methods, ii) perceptual discomfort due to image duplication, discontinuity, and distortion resulting from stimulus scaling, iii) the movement of fixation points, and iv) the competition for attention between foveal and peripheral magnified objects. This study prompts the authors to consider a training programme on the differential linear and nonlinear magnification methods in future studies. With proper instructions regarding the nature of lens and magnified images, subjects' performance with the novel differential magnification methods may be improved.
机译：这项研究调查了新型差分线性和差分非线性放大方法的有效性，以及放大镜形状和放大倍数对视觉搜索性能的影响。使用微分放大倍率，外围物体的缩放比例要高于注视附近的物体。假设：1）由于在注视附近缩放刺激无效，因此差动放大方法会增强放大效果，从而改善检查性能; 2）因为椭圆透镜的形状类似于人类视野的形状，因此在相同的放大视图区域，椭圆形的放大镜比圆形的放大镜更有效。在这项研究中，使用了速度和准确性的客观绩效指标以及使用NASA任务负荷指数范式进行的主观工作量评估。结果表明，与3倍放大倍数相比，4倍放大倍数增加了整体检查时间，这表明在放大倍数和视场大小之间可能会进行权衡。这两个假设没有得到证实。但是，出现了许多问题，需要进一步调查。对以下问题进行了讨论：i）对象对新的差分放大方法不熟悉; ii）由于图像缩放，不连续和由刺激缩放导致的失真所致的感知不适; iii）固定点的移动; iv）小凹和周围放大物体之间的注意力争夺。这项研究促使作者在以后的研究中考虑一个关于差分线性和非线性放大方法的培训计划。借助有关镜头和放大图像性质的正确说明，可以提高使用新型差动放大方法拍摄对象的表现。

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