在琳瑯滿目的七彩世界中，從資訊量爆炸的視覺內容中對需求的項目搜尋與揀選勢在必行，若能提升視覺搜尋的效率將大幅加快其他事務處理的腳步。或者從百花撩亂的物件中更加醒目、突出，而達到宣傳或引起注目的效果。而如何達到醒目的效果，又有何因素影響醒目度，本研究將透過色彩三屬性以及圖形的特徵進一步探討與醒目度的關聯。
本研究分成兩個實驗，實驗一：圖形面積與圓潤度之心理量化實驗，與實驗二：醒目度實驗。
實驗一使用不同圓角比的圓角三角形（包含正三角形、圓形、圓角三角形），透過心理物理學方法建立面積與圓潤度之心理量化的數學模型，以供實驗二設定測試圖形，使受測者對於不同的圖形能感受到相同的面積與圓潤度。
實驗二採用反應時間的倒數做為醒目度依據，受測者要從24個圖形中以最快時間找到和目標物特徵完全相符的唯一圖形。實驗二又分為四個部分：(1) 滑鼠移動時間實驗、(2) 圖形（面積與圓潤度）醒目度實驗、(3) 色彩醒目度實驗、(4) 模型測試與醒目度模型建立。第一個部分是為了排除後續實驗裡目標物位置的影響，而建立滑鼠移動時間數學模型。第二與第三部分分別建立了面積、圓潤度與色彩的醒目度模型。第四個部分根據模型測試的題目，統整第二與第三部分的數學模型，建立醒目度的數學模型。

In this colourful world which is information overload, how can we efficiently get the right information we need? Efficiently visual searching is important. More conspicuous the target is, more attention the target can attract. The relationship between conspicuity and colour attributes, size and smoothness was investigated in this study.
Two experiments were conducted in this study. The first experiment was psychological quantification of size and smoothness of rounded triangles, with various round corner ratio, i.e. the diameter of the round corner divided by the height of the shape. The second experiment was conspicuity experiment.
The first experiment used psychophysical methods to develop models of psychological quantification of size and smoothness. The models were used to set up the test shapes for use in the second experiment.
The visual conspicuity was defined in this study as the reciprocal of reaction time. Observers were asked to find the target from twenty-four shapes as soon as possible. The experiment had four parts : (1) the test of reaction time for mouse movement, (2) the influence of characteristics of the shape on conspicuity, (3) the influence of colours on conspicuity, (4) developing and testing the conspicuity model. The model of mouse movement was derived in the first part of the experiment to exclude the influence of the position of the target. The conspicuity models based on the impact of size, smoothness and colour were developed in the second and the third parts. A final version of the conspicuity model was derived on the basis of the three models for size, smoothness and colour, and was tested in the fourth part of the experiment with satisfactory predictive performance.

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