求翻译：In the "photo-based image synthesis technology" [2] This paper presents a general picture image based on three-dimensional virtual image technology, it is only used as the field gradient algorithm to generate three-dimensional visual effect similar to, and did not form meaningful three-dimensional model. Mainly in the photo is not available for shooting point of view, the results can not be reflected in the calculation. Another article, "with a single digital camera to achieve the three-dimensional surface reconstruction," [3] proposed a three-dimensional reconstruction technique is based on a digital camera photo images to reconstruct three-dimensional surface model是什么意思？

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