High-Precision 8 μm Metal-Framed Checkerboard Film Calibration Target for Large-Format Transmissive Calibration

The metal-frame mounted checkerboard film target is an optical calibration device consisting of a high-precision, high-contrast checkerboard pattern film (typically PET) securely bonded to a rigid metal frame (such as aluminum alloy or stainless steel) using a precision flat-mounting process.

Because the film material is inherently soft and prone to curling or deformation, stretching it flat and bonding it to a rigid metal frame resolves issues with wrinkling and poor flatness, offering a balance between cost-effectiveness and surface flatness.

Composed of alternating black and white squares, the pattern utilizes distinct "corner points" to provide precise pixel coordinate references for camera algorithms. It is widely used in machine vision for camera calibration, distortion correction, and spatial measurement.

High-precision patterns are printed or exposed onto photographic film or light-transmissive PET film, offering high contrast, good light transmission, and relatively low production costs.

• High Contrast and Sharp Corners: The black-and-white (opaque/transmissive) nature of the film creates extremely sharp boundaries when illuminated by transmitted light or a backlight, facilitating the automatic extraction of corner points by algorithms.
• Cost-Effectiveness and Portability: Compared to calibration targets based on solid glass or quartz substrates, metal-frame mounted film targets are lighter and less expensive to produce, and they are easier to manufacture in large sizes.
• Enhanced Flatness: By tensioning and bonding the film to a rigid, deformation-resistant metal frame, the risk of the flexible film warping or distorting during use is effectively eliminated.

1. Industrial Machine Vision Calibration: Calibration of intrinsic and extrinsic parameters and distortion measurement for industrial cameras (2D/3D cameras).
2. Backlight/Transmissive Measurement Systems: Used in conjunction with a backlight source (such as a transmissive light box) to evaluate the imaging quality of optical components like lenses.
3. Large-Scale Calibration Setup: Provides lightweight, large-area calibration boards for applications requiring a wide field of view (such as vehicle frame measurement or large-range visual positioning).