PATENT CLAIM ANALYSIS

Application Number: 16019000
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2018-10
Patent Classification: ["348", "135000"]

Abstract:
A method obtains the shape of a target by projecting and recording images of dual frequency fringe patterns. Locations in each projector image plane are encoded into the patterns and projected onto die target while images are recorded. The resulting images show the patterns superimposed onto the target. The images are decoded to recover relative phase values for the patterns primary and dual frequencies. The relative phases are unwrapped into absolute phases and converted back to projector image plane locations. The relation between camera pixels and decoded projector locations is saved as a correspondence image representing the measured shape of the target. Correspondence images with a geometric triangulation method create a 3D model of the target. Dual frequency hinge patterns have a low frequency embedded into a high frequency sinusoidal, both frequencies are recovered in closed form by the decoding method, thus, enabling direct phase unwrapping.

Claim (Index 7):
The method of  claim 6 , wherein the step of decoding comprises the steps of:\n constructing a sequence of shift matrices, the length of the a sequence of shift matrices being equal to the number of frequencies, each shift matrix in the sequence of shift matrices corresponding to one of the pattern frequencies in the sequence of pattern frequencies, the shift matrix having two columns, the shift matrix having a number of rows equal to a corresponding frequency shift number in the sequence of frequency shift numbers, the first column of the shift matrix resulting from concatenating the cosines of a corresponding plurality of frequency shifts, the second column of the shift matrix resulting from concatenating the negative of the sines of a corresponding plurality of frequency shifts; constructing a global shift matrix, the number of columns of the global shift matrix being equal to two times the number of frequencies plus one, the number of rows of the shift matrix being equal to the length of the sequence of patterns, the global shift matrix comprising a first column and a block shift matrix, the block shift matrix comprising the all the columns of the global shift matrix except for the first column, all the elements of the first column being equal to one, the block matrix being a block diagonal matrix defined by the shift matrices in the sequence of shift matrices, the block matrix having elements not corresponding to shift matrix elements being equal to zero; repeating the following steps until all the camera pixels have been decoded; selecting an undecoded camera pixel; constructing a pixel radiance vector by concatenating the pixel values of the images in the sequence of images corresponding to the camera pixel; defining a pixel phase vector, the pixel phase vector having dimension equal to two times the number of frequencies plus one, the pixel phase vector comprising a pixel offset and pixel phase pairs, the pixel offset being the first element of the pixel phase vector, the pixel phase pairs being in correspondence with the pattern frequencies; estimating the pixel phase vector as the minimizer of a phase error energy, the phase error energy being equal to the square norm of a pixel phase difference, the pixel phase difference being computed by subtracting the product of the global shift matrix times the pixel phase vector from the pixel radiance vector; determining for each pixel phase pair a pattern amplitude as the square root of the sum of the squares of the two elements of the pixel phase pair; determining for each pixel phase pair a relative pattern phase as an inverse tangent of the ratio of the first element of the pixel phase pair divided by the second element of the pixel phase pair, the inverse tangent further divided by the corresponding pattern frequency; computing a sequence of relative embedded pattern phases, the length of the sequence of relative embedded pattern phases being equal to the number of frequencies, the sequence of relative embedded pattern phases having a first relative embedded pattern phase, the first relative pattern phase being equal to the corresponding relative pattern phase, each subsequent relative embedded pattern phase in the sequence of relative embedded pattern phases being equal to the result of subtracting the relative pattern phase corresponding to the first relative phase from the relative pattern phase corresponding to the subsequent embedded pattern phase; and determining a projector location for the pixel by temporal phase unwrapping the elements of the sequence of relative embedded phases.

Metadata:
- Claim Count in Document: 17.0
- Percentile: 94.0
- Lexical Diversity: 1.84706
- Patent Class: 348.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['13907426', '13674715', '11566026', '10898504', '15052489']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.5996609511813279
- 35 USC 102 Novelty (BERT): 0.5088805038174389
- Combined Prediction Score: 0.590582906444939
- Mean Citation Score: 217.787424
- Max Citation Score: 240.23955
- Similarity Product: 140.23615951959192

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test