A PPC array color image encoding device and method

Abstract

The present invention discloses a PPC array color image encoding device and method, belonging to the field of micro-optoelectromechanics. The PPC array color image encoding device includes an incident end fiber optic array, a waveguide fiber optic bundle, and a PPC array. The incident end fiber optic array is composed of m×n fiber optic bundle incident ends, serving as an imaging receiving surface to receive imaging light and guide the imaging light into the waveguide fiber optic bundle. The waveguide fiber optic bundle enables the imaging light to be totally reflected therein and transmitted to each PPC. The PPC array is composed of m×n PPCs, which separate the imaging light into light of different wavelengths and output it at corresponding photonic crystal holes. The PPC array color image encoding method adopts a PPC array structure, realizing multi-band single-shot encoding imaging, being applicable to occasions with high requirements for visual measurement speed and accuracy, and capable of targeting dynamic moving objects.

Description

Technical Field

[0001] The present invention relates to a PPC array color image encoding device and method, belonging to the field of micro-optoelectromechanics. Background Art

[0002] Color image encoding is a key technology in digital imaging research. Currently, the method of filtering imaging light by using a CMOS or CCD front RGB filter is widely adopted to achieve color image encoding. However, in this filtering method, every four sites represent a pixel, greatly sacrificing the spatial imaging resolution, and the color perception depends on the passing wavelength of the filter, and it cannot be flexibly changed according to the imaging requirements. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention provides a PPC (planar photonic crystals) array color image encoding device and method to solve the above existing problems.

[0004] The technical solution for implementing a PPC array color image encoding device of the present invention is as follows: The device includes an incident end fiber array, a waveguide fiber bundle, and a PPC array; the incident end fiber array is composed of m×n fiber bundle incident ends, serving as an imaging receiving surface, receiving imaging light, and guiding the imaging light into the waveguide fiber bundle; the waveguide fiber bundle enables the imaging light to be totally reflected therein and transmitted to each PPC; the PPC array is composed of m×n PPCs, separating the imaging light into different wavelength lights and outputting at corresponding photonic crystal holes.

[0005] Regular crystal holes are distributed on the PPC, and the hole pitch is in the micrometer order. The introduced imaging light is separated into different wavelength lights under crystal resonance and sequentially exits from the photonic crystal holes, and the output wavelength is determined by the resonance wavelength of the photonic crystal holes.

[0006] A PPC array color image encoding method proposed by the present invention uses the above-mentioned PPC array color image encoding device and comprises the following steps:

[0007] Step 1: Lithograph crystal holes with different apertures on the PPC, control the structural dimensions of each crystal hole, and different structural dimensions result in different main wavelengths of the output light.

[0008] Step 2: Combine m×n PPCs to form a PPC array B m×n , where the number r of crystal holes and the one-dimensional position distribution on each PPC are the same, and the main wavelengths λ i of the output light of the crystal holes in the same sequence i are also the same.

[0009] Step 3: Combine the incident ends of the waveguide fiber bundles of each PPC to form an array A m×n, and is consistent with the PPC row and column.

[0010] Step Four: The imaging light hits the incident end fiber optic array to form the pre-color-coded image A(x, y), where 0 < x ≤ n and 0 < y ≤ m. The separated main wavelength images are B λi (x, y), and the relationship is:

[0011]

[0012] Step Five: The color-coded image is C(u, v), where 0 < u ≤ rn and 0 < v ≤ m, and the relationship is:

[0013]

[0014] W λi is an n×rn conversion matrix, where the element in the p-th row and the ((p - 1)×r + i)-th column is 1, and other elements are 0, where p = 1, 2, 3,... n.

[0015] It can be seen that through Steps One, Two, Three, Four, and Five, color image coding for r channels can be achieved.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The PPC array color image coding device and method provided by the present invention adopt the PPC array structure to achieve color image coding for r channels. Compared with the prior art, the PPC array color image coding device provided by the present invention can set the number of channels and the values of each main wavelength according to requirements without sacrificing spatial resolution. The PPC array color image coding method provided by the present invention realizes multi-band single-shot coding imaging, that is, multi-band spectral imaging is completed in one exposure, which is applicable to occasions with high requirements for visual measurement speed and accuracy, and can be used for dynamic moving targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the structural diagram of the PPC array color image coding device provided by the present invention;

[0019] Figure 2 is the schematic diagram of single PPC light splitting of the present invention.

[0020] In the figure: 1 - incident end fiber optic array, 2 - waveguide fiber bundle, 3 - PPC array, 31 - first main wavelength photonic crystal hole, 32 - second main wavelength photonic crystal hole, 33 - third main wavelength photonic crystal hole, 34 - fourth main wavelength photonic crystal hole, 3r - r-th main wavelength photonic crystal hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be further described in detail below in conjunction with the specific embodiments.

[0022] As shown Figure 1 in the figure, a PPC array color image encoding device of the present invention includes an incident end fiber optic array 1, a waveguide fiber optic bundle 2, and a PPC array 3; the incident end fiber optic array 1 is composed of m×n fiber optic bundle incident ends, serving as an imaging receiving surface to receive imaging light and guiding the imaging light into the waveguide fiber optic bundle 2; the waveguide fiber optic bundle 2 enables the imaging light to be totally reflected therein and transmitted to each PPC; the PPC array 3 is composed of m×n PPCs, separating the imaging light into light rays of different wavelengths and outputting at corresponding photonic crystal holes.

[0023] As shown Figure 2 in the figure, regularly distributed crystal holes are formed on the PPC, the hole pitch is in the micron order of magnitude, and the imported imaging light is separated into light rays of different wavelengths under crystal resonance and sequentially exits from the photonic crystal holes, and the output wavelength is determined by the resonance wavelength of the photonic crystal holes.

[0024] A PPC array color image encoding method proposed by the present invention utilizes the above-mentioned PPC array color image encoding device and follows the following steps:

[0025] Step 1: Lithographically form crystal holes with different apertures on the PPC, control the structural dimensions of each crystal hole, and different structural dimensions result in different main wavelengths of the emitted light.

[0026] Step 2: Combine and arrange m×n PPCs into a PPC array B m×n , where the number r of crystal holes and the one-dimensional position distribution on each PPC are the same, and the main wavelengths λ i of the emitted light from the crystal holes in the same sequence i are also the same.

[0027] Step 3: Combine the incident ends of the waveguide fiber optic bundles of each PPC into an array A m×n , which is consistent with the PPC rows and columns.

[0028] Step 4: The imaging light hits the incident end fiber optic array to form a pre-color-encoded image A(x,y), 0 < x ≤ n, 0 < y ≤ m, and the separated main wavelength images are B λi (x,y), and the relationship is:

[0029]

[0030] Step 5: The color-encoded image is C(u,v), 0 < u ≤ rn, 0 < v ≤ m, and the relationship is:

[0031]

[0032] W λiis an n×rn conversion matrix, where the element in the p-th row and the (p - 1)×r + i-th column is 1, and other elements are 0, p = 1, 2, 3, … n.

[0033] It can be seen that through steps one, two, three, four, and five, color image coding of r channels can be achieved.

[0034] Embodiment:

[0035] The following further details the present invention by taking the color image coding of a 4-channel PPC array as an example:

[0036] Select a 720×1280 PPC array. The incident end fiber array 1 consists of 720×1280 fiber beam incident ends, serving as the imaging receiving surface, receiving imaging light, and guiding the imaging light into the waveguide fiber bundle 2; four crystal holes are lithographed on each PPC, and the structural dimensions of each crystal hole are controlled. Different structural dimensions result in different main wavelengths of the emitted light, specifically, λ1 = 450nm, λ2 = 550nm, λ3 = 650nm, λ4 = 750nm; the PPC separates the imaging light in the visible light band (380nm, 780nm) into four main wavelength lights of λ1, λ2, λ3, and λ4, and outputs them sequentially at the corresponding first main wavelength photonic crystal hole 31, second main wavelength photonic crystal hole 32, third main wavelength photonic crystal hole 33, and fourth main wavelength photonic crystal hole 34.

[0037] PPC array B 720×1280 , where the number of crystal holes on each PPC is 4 and the one-dimensional position distribution is the same. The main wavelength λ of the emitted light from the crystal holes with the same sequence i i is also the same; the incident ends of the waveguide fiber bundles of each PPC are combined into array A 720×1280 , and are consistent with the PPC rows and columns; the imaging light hits the incident end fiber array to form the pre-color-coded image A(x, y), 0 < x ≤ 1280, 0 < y ≤ 720, and the separated main wavelength images are B λi (x, y), and the relationship is:

[0038] A(x, y) = B λ1 (x, y) + B λ2 (x, y) + B λ3 (x, y) + B λ4 (x, y) (3)

[0039] The color-coded image is C(u, v), 0 < u ≤ 5120, 0 < v ≤ 720, and the relationship is:

[0040] C(u, v) = B λ1 (x, y)·W λ1 + B λ2 (x, y)·Wλ2 +B λ3 (x, y)·W λ3 +B λ4 (x, y)·W λ4 (4)

[0041]

[0042]

[0043] W λ1 、W λ2 、W λ3 、W λ4 are 1280×5120 conversion matrices; where the element in the p-th row and the ((p - 1)×4 + 1)-th column of W λ1 is 1, and other elements are 0; the element in the p-th row and the ((p - 1)×4 + 2)-th column of W λ2 is 1, and other elements are 0; the element in the p-th row and the ((p - 1)×4 + 3)-th column of W λ3 is 1, and other elements are 0; the element in the p-th row and the ((p - 1)×4 + 4)-th column of W λ4 is 1, and other elements are 0; p = 1, 2, 3,..., 1280.

[0044] At this time, the embodiment realizes the color image coding of four channels, and the coded image is C(u, v).

[0045] The present invention can set the number of channels and the values of each main wavelength according to requirements, and is not limited to this embodiment.

[0046] Although the present invention has been described above in conjunction with the figures, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many deformations without departing from the purpose of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A PPC array color image encoding method, wherein a PPC array color image encoding device adopted includes an incident end fiber optic array (1), a waveguide fiber optic bundle (2), and a PPC array (3); the incident end fiber optic array (1) is composed of m×n fiber optic bundle incident ends, serves as an imaging receiving surface, receives imaging light, and guides the imaging light into the waveguide fiber optic bundle (2); the waveguide fiber optic bundle (2) enables the imaging light to be totally reflected therein and transmitted to each PPC; the PPC array (3) is composed of m×n PPCs, separates the imaging light into light of different wavelengths and outputs it at corresponding photonic crystal holes; regularly distributed crystal holes are formed on the PPCs, the hole pitch is on the order of micrometers, the introduced imaging light is separated into light of different wavelengths under crystal resonance and sequentially exits from the photonic crystal holes, and the emitted wavelength is determined by the resonance wavelength of the photonic crystal holes; characterized in that, Including the following steps: Step 1: Lithograph crystal holes with the same aperture on the PPC, and control the structural dimensions of each crystal hole. Different structural dimensions result in different main wavelengths of the emitted light; Step 2: Arrange m×n PPCs in combination to form a PPC array B m×n , where the number r of crystal holes on each PPC and the one-dimensional position distribution are the same, and the main emission wavelength λ of the crystal holes with the same sequence i i is also the same; Step 3: Combine the incident ends of the waveguide fiber bundles of each PPC into an array A m×n , and make it consistent with the PPC rows and columns; Step 4: The imaging light hits the incident fiber array to form a pre-color-coded image A(x, y), where 0 < x ≤ n and 0 < y ≤ m, and the separated principal wavelength images are B λi (x, y), and the relationship is as follows: Step 5: The color-coded image is C(u, v), where 0 < u ≤ rn and 0 < v ≤ m, and the relationship is: W λi is an n×rn conversion matrix, where the element in the p-th row and the ((p - 1)×r + i)-th column is 1, and all other elements are 0, p = 1, 2, 3, … n; It can be seen that through Steps 1, 2, 3, 4, and 5, color image coding for r channels can be achieved.

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