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Geometric distortion test card-grid distortion test card

Geometric distortion test card-grid distortion test card

Brand: Sine Image
Model: YE0183
Size: 280 x 210MM
Scale: 4: 3
Type: reflective / transmissive optional
Free consultation: 400-666-2522
  • product description
  • Specifications
  • related software

Geometric Distortion Test Chart (Distortion Test Chart), also known as Distortion Test Card, is a test card used to test camera image line distortion (the straight line near the edge of the image becomes a curve);
The test card is very intuitive to the naked eye, and the specific distortion difference can also be obtained by software testing.

Introduction to Grid Distortion Test Card

A grid structure consists of 14 horizontal and 19 vertical lines on a white background. This grid is consistent with the electronic grid generated by the test generator. This grid corresponds to the spherical structure of the T01 geometric test card.

YE0183 distortion test card is designed to test the operation modulation and control of TV cameras. The grid can be used to make a rough visual assessment of the linear scanning performance, and the lines play a role in adjusting the positioning.

In addition, the grid distortion test card can also be made into white lines with black background.

Distortion principle and related knowledge

Lens distortion is an aberration that causes straight lines near the edges of an image to become curved. It can cause problems for architectural photography and photogrammetry. The simplest approximate expression, ru = rd + krd3, where ru is the radius from the optical center of the image without distortion to a point, and rd is the radius from the center of the distortion to that point. Depending on the sign of k, the distortion can be "barrel-shaped" or "cushion-shaped".

Both lens distortion and distortion correction coefficients can be calculated in Imatest distortion, which also includes fifth-order and tangent / inverse tangent distortion models. The SFRplus project can show how much detail the distortion has lost, and how it affects sharpness and other factors. The most serious distortions are wide-angle lenses, telephoto lenses, and zoom lenses. Distortion tends to be more severe in close-up images than in normal distance images. Distortion can be easily corrected with software.

Camera as a video input device, can be widely used as independent products in surveillance, security, remote video, medical and other fields, and can also be widely used as accessories in mobile phones, notebooks and other communications, electronics and electrical products . Especially in recent years, with the development of the Internet and other fields, as well as the gradual maturity and stability of photosensitive imaging device technology, cameras and products containing cameras have increasingly entered all aspects and areas of people's lives. The camera is mainly composed of accessories such as the lens, the main control chip, the photosensitive chip, and the power supply. At present, there is no unified standard requirement for these accessories in the market. This results in uneven performance and quality of these accessories, and directly determines the camera product Performance indicators are very different from users' actual feelings. Therefore, it is particularly important to perform quantitative verification and detection of the performance indicators of the camera products.

Part One: 3NH Official Download

Part 2: Download the full range of color card electronic versions

Part III: Download of 3nh instrument instruction manual

Part 1: 3NH official download

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Part 2: Download the full range of color card electronic versions

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Part III: Download of 3nh instrument instruction manual

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