Sine curve calibration board for color camera calibration

Abstract

The utility model discloses a sine curve calibration board used for color camera calibration, comprising a rectangular substrate, the rectangular substrate is provided with a plurality of groups of sine curves arranged in parallel along the horizontal direction, and each group of sine curves comprises a red sine curve, a green sine curve and a blue sine curve which are sequentially arranged in parallel from top to bottom. And the distances between the adjacent sine curves are equal. According to the utility model, the three primary color curves of red, green and blue are utilized to respectively calibrate different color channels in the color image, so that the geometric and color consistency among the channels is improved; the sine curve structure has periodicity and high-frequency change characteristics, so that sub-pixel-level edge detection and registration are facilitated; the calibration plate is simple in structure and low in manufacturing cost, and can be widely applied to color image calibration scenes of industrial cameras and scientific research equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to machine vision and image processing technical field especially, a kind of sinusoidal curve calibration plate for color camera calibration. BACKGROUND

[0002] In machine vision system, camera calibration is the key step of obtaining high-precision image measurement and three-dimensional reconstruction. The traditional camera calibration method usually uses black and white checkerboard or dot array calibration plate, these methods have good effect in grayscale image, but there is certain limitation in color image processing scene. Especially in the application with high color channel separation and correction accuracy requirement, the existing calibration plate is difficult to meet the high-precision requirement of color camera. SUMMARY

[0003] To solve the above technical problems, the utility model designs a kind of sinusoidal curve calibration plate for color camera calibration.

[0004] The utility model adopts the following technical scheme:

[0005] A kind of sinusoidal curve calibration plate for color camera calibration, including rectangular substrate, the rectangular substrate is equipped with multiple groups of sinusoidal curve parallel arrangement along horizontal direction, each group of sinusoidal curve includes red sinusoidal curve, green sinusoidal curve and blue sinusoidal curve in turn parallel arrangement from top to bottom, the interval between adjacent sinusoidal curve is equal.

[0006] As preferred, the amplitude and period of the red sinusoidal curve, green sinusoidal curve and blue sinusoidal curve are same.

[0007] As preferred, concentric circle positioning mark is arranged on the four corners of the rectangular substrate.

[0008] As preferred, the rectangular substrate is flat white background plate.

[0009] The utility model has the advantages that: (1), the utility model uses red, green and blue three primary color curves to calibrate different color channels in color image respectively, improves the geometric and color consistency between channels;(2), sinusoidal curve structure has periodicity and high-frequency variation characteristics, facilitating sub-pixel level edge detection and registration;(3), calibration plate structure is simple, and production cost is low, can be widely used in color image calibration scene of industrial camera and scientific research equipment. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structure schematic diagram of the utility model;

[0011] In the drawing: 1, rectangular substrate, 2, red sinusoidal curve, 3, green sinusoidal curve, 4, blue sinusoidal curve, 5, concentric circle positioning mark. Detailed Implementation

[0012] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0013] Example: Figure 1 As shown, a sine curve calibration board for color camera calibration includes a rectangular substrate 1, which is a flat white background board. The rectangular substrate has two sets of sine curves arranged in parallel along the horizontal direction. Each set of sine curves includes a red sine curve 2, a green sine curve 3, and a blue sine curve 4 arranged in parallel from top to bottom. The spacing between adjacent sine curves is equal.

[0014] The red, green, and blue sine curves have the same amplitude and period, extending horizontally to allow the camera to capture images from different angles. Concentric circle positioning marks 5 are provided at the four corners of the rectangular substrate.

[0015] During the calibration process, the system extracts the three RGB channels from the image. By fitting and aligning the geometric information of each color curve, the camera's intrinsic parameter matrix, color response model, and distortion parameters can be calculated, thereby achieving high-precision color image correction.

[0016] This invention utilizes the red, green, and blue primary color curves to calibrate different color channels in a color image, improving the geometric and color consistency between channels. The sine curve structure has periodic and high-frequency variation characteristics, facilitating sub-pixel-level edge detection and registration. The calibration board has a simple structure and low manufacturing cost, and can be widely used in color image calibration scenarios for industrial cameras and scientific research equipment.

[0017] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A sinusoidal calibration plate for color camera calibration, comprising a rectangular substrate, characterized in that, The rectangular substrate is provided with a plurality of groups of sinusoidal curves arranged in parallel along the horizontal direction, each group of sinusoidal curves comprising a red sinusoidal curve, a green sinusoidal curve and a blue sinusoidal curve arranged in parallel from top to bottom, and the spacing between adjacent sinusoidal curves is equal.

2. A sinusoidal calibration plate for color camera calibration according to claim 1, characterized in that, The red sinusoidal curve, the green sinusoidal curve and the blue sinusoidal curve have the same amplitude and period.

3. A sinusoidal calibration plate for color camera calibration according to claim 1, characterized in that, The rectangular substrate is provided with concentric circle positioning marks on the four corners.

4. A sinusoidal calibration plate for color camera calibration according to claim 1, characterized in that, The rectangular substrate is a flat white background plate.

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