Illustrative Rendering of Historical Artifacts

彬彬

Abstract

Many non-photorealistic rendering techniques are used for clearer

illustration of shapes. Most have a rather limited set of models

on which they work well. We categorize several techniques and

provide a framework for selecting the best, or a combination of the

best techniques, given a class of models. In particular, we use a

small sample of models as a training set and apply the resulting

learned technique on models of the given class. We demonstrate

our results on models of historical artifacts with significant damage

and noisy areas.

1 Introduction

Non-photorealistic rendering is better than the usual photorealistic

rendering at abstracting away unnecessary details and highlighting

prominent features. The results can also be visually more appealing.

Curves on a shape have been considered important visual cues.

Hence various “feature” curve detection techniques have been devised.

In our experience, the noise resulting from damage and also

significant variance in the nature and style of geometry in historical

artifacts make line-drawing based techniques unsatisfactory. However,

when used to enhance smooth shading, they provide excellent

detail.

Figure 1: Combination: ridges brightened, valleys and suggestive

contours darkened

Feature curves we have found useful include silhouettes and contours,

ridges and valleys, suggestive contours, apparent ridges and

demarcating curves.

2 Our Approach

We realize that perception of enhanced features is subjective and

hence include human evaluation in the loop. Furthermore, we put

the property in a common framework so as to facilitate comparing

and combining them.

C.R.CAN

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奇

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晃晃

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晃晃

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奇

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C.R.CAN

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晃晃

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