A fault-tolerant method for combined encoding and decoding of visual 3D measurement

Abstract

The invention provides a fault-tolerance method for combined encoding and decoding of three-dimensional visual measurement. According to the fault-tolerance method, the process of encoding and decoding is transformed to normalization space and performed, and calculation is facilitated; through normalization factor mapping, encoding and decoding can be performed in the measurement space on any scale. In the encoding process, the cycle length of a simulation code is set to be two, and the cycle length of a digital code is set to be one; the starting point of the simulation code is set to be a lag of 0.5 relative to the starting point of the digital code. In the decoding process, a combination code value is obtained through a fault-tolerance formula, and therefore the influence on the combination code value by a most-error-prone digital code value is avoided. According to the fault-tolerance method, in the overall encoding space, a combination code value error caused by a digital code value error is corrected, and therefore a measurement gross error is avoided; namely, a measurement gross error caused by an image information extraction error is avoided.

Description

[0001] (1) Technical field [0002] The invention relates to the field of visual three-dimensional measurement, in particular to a combined encoding and decoding method and a fault-tolerant method in the field. [0003] (2) Background technology [0004] Visual three-dimensional measurement methods mainly include two types: structured light method and binocular method. The two types of methods divide the measurement space through the encoding and decoding process, and the purpose is to improve measurement efficiency (speed) while ensuring measurement accuracy. [0005] Codec methods mainly include spatial codec and time codec, in which the former has higher measurement efficiency and the latter has higher measurement accuracy. [0006] Time codecs are mainly divided into three categories: digital codes, analog codes, and combined codes. [0007] The digital code divides the measurement space into several areas, and each area corresponds to a digital code value, so the digital ...

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Problems solved by technology

[0010] In recent years, researchers at home and abroad have proposed a variety of combined codes. Their basic characteristics are that the period length of the digital code is equal to the length of the analog code period during encoding, and the starting point of the digital code is the same as that of the analog code (that is, the edge of each digital code period One-to-one alignment with the edge of the analog code cycle); their disadvantage is that when decoding, the image information extraction error (gray level, color judgment error) may cause the digital code value k to be wrong (especially near the edge of the cycle), resulting in the combined code value errors, resulting in gross measurement errors (approximately Integer multiples of ), and by The error produced is much smaller than the error produced by k

In order to avoid gross errors in measurement, researchers at home and abroad have proposed some code value discrimination and correction rules at the edge of the period, which have a certain effect on some coarse error points; Establish the mathematical model of this relation, do not utilize codec method to eliminate gross error point in the whole coding space (corresponding to the whole measurement space), and this is the problem that the present invention is dedicated to solving

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