Full-automatic low-vision false image color filter array mode design method

A color filter and pattern design technology, applied to color TV, color TV parts, picture signal generator, etc., can solve the problems of complex calculation and easy visual artifacts, and achieve less computational complexity, less error, The effect of reducing the error

Active Publication Date: 2019-10-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a fully automatic low-visual-artifact color filter array mode design method to solve the problems of manual participation, complex calculation and easy generation of visual artifacts in existing methods

Method used

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  • Full-automatic low-vision false image color filter array mode design method
  • Full-automatic low-vision false image color filter array mode design method
  • Full-automatic low-vision false image color filter array mode design method

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Embodiment 1

[0068] This embodiment takes the color filter array pattern whose input size is 4×4 as an example to explain the implementation process of the design method of the present invention.

[0069] The initial form of the input frequency structure is Brightness component F L at point (1,1). Except for the horizontal axis and the vertical axis of the luma component position, the remaining positions of 0 are all candidate positions of the chrominance component. Using NSGA-Ⅱ to solve, the obtained Pareto front surface is as follows figure 1 as shown in a. Among them, the x-axis represents the minimum value of the distance between the luma component and the chroma component, the y-axis represents the minimum value of the distance between the chroma components, and the z-axis represents the number of non-zero aliasing components. Choose the solution that minimizes the number of non-zero aliasing components. Because the aggregation of chrominance components in the frequency domain s...

Embodiment 2

[0082] This embodiment is an embodiment of designing a color filter array of 9*9, and this embodiment obtains the optimal color filter array pattern such as Figure 5 As shown, the color values ​​are:

[0083]

[0084]

[0085]

[0086] Its spectrogram is as Figure 6 As shown, using the 9*9 color filter array of the embodiment of the present invention and respectively Figure 4 The Bayer, Hirakawa, Hao, and Condat color filter arrays shown in (a), (b), (c), and (d) collect all 24 pictures in the Kodak dataset, and then use LSLCD to demosaic the 24 pictures, and finally Comparing the signal-to-noise ratio (CPSNR) of the 24 pictures with the real picture is shown in Table 1, and better values ​​are marked in bold. It can be seen from Table 1 that the optimal CPSNR of each picture is not concentrated in a certain CFA, but scattered among the five CFAs participating in the comparison. When collecting pictures #1, #3, #6, #10, #12, #13, #17, #18, #22, #24, the performa...

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Abstract

The invention discloses a full-automatic low-vision false image color filter array mode design method. The method comprises the following steps of generating a matrix model according to a to-be-designed color filter array mode, specifying position information of a brightness component in the matrix model, calculating position information of a chrominance component in the matrix model according tothe position information of the brightness component, generating a frequency structure, and establishing a conversion matrix model according to a conversion matrix corresponding to the frequency structure; performing iterative computation, judging whether a preset maximum number of iterations is reached or not, and if not, continuing iterative computation until the maximum number of iterations isreached; if so, selecting an optimal conversion matrix meeting the conversion matrix model from the third conversion matrix group, extracting chrominance component values and brightness component values in the optimal conversion matrix, and adding the chrominance component values and the brightness component values into the frequency structure to obtain a to-be-designed color filter array mode. The method can solve the problems that in an existing method, manual participation is needed, calculation is complex, and visual artifacts are likely to be generated.

Description

【Technical field】 [0001] The invention belongs to the technical field of color imaging, and in particular relates to a fully automatic low visual artifact color filter array mode design method. 【Background technique】 [0002] A color image contains at least three color components at each pixel, such as red (R), green (G) and blue (B), or cyan (C), magenta (M) and yellow (Y). Theoretically, for a digital camera to capture a color image, each pixel should have at least three sensors in order to perceive at least three color components at the same time. However, multiple sensors are expensive and difficult to pinpoint precisely. Therefore, most digital cameras use a single sensor covered with an array of color filters. The color filter array is a piece of hardware that is the same size as the sensor and allows detection of only one color component at each pixel. The color filter arrays are all periodic and defined on a square matrix, where the smallest periodic array is call...

Claims

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Application Information

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IPC IPC(8): H04N9/04
CPCH04N25/13
Inventor 李琳孙凌晨王冬梅潘泉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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