ISO 12233:2023 eSFR Test Chart

The ColorSpace ISO 12233:2023 eSFR Test Chart is designed for Spatial Frequency Response (SFR) testing of digital cameras and imaging systems. It follows the e-SFR test method specified in ISO 12233:2023.

---

Spatial Frequency Response (SFR) describes an imaging system's response to image information at different spatial frequencies. It is an important parameter for evaluating the spatial resolution and overall imaging performance of digital imaging systems.

ISO 12233:2023 specifies methods for evaluating the resolution and spatial frequency response of electronic still picture imaging systems. The e-SFR method in this edition uses a four-cycle slanted star test pattern. By analyzing the edge response within the slanted-star regions, spatial frequency response information can be obtained at different positions and orientations across the image field.

The ColorSpace ISO 12233:2023 e-SFR Test Chart incorporates nine standard slanted-star test regions for e-SFR measurements at different image-field positions.

Two versions are available with 4:1 and 6:1 edge reflectance ratios, corresponding to CS-TC009 and CS-TC009-R, respectively.

Captured test images can be analyzed using image quality analysis software such as Imatest Master and CS-CIQT General Edition for e-SFR, SFR, MTF, and related image quality measurements.

Key Features

01｜ISO 12233:2023 e-SFR Test Pattern

Uses the four-cycle slanted star test pattern specified in ISO 12233:2023 for spatial frequency response testing of digital cameras and imaging systems.

02｜Nine Standard Slanted-Star Test Regions

The standard e-SFR test chart includes nine slanted-star test regions, enabling spatial frequency response analysis at different positions across the image field.

03｜Multi-Directional Spatial Frequency Response Analysis

The four-cycle slanted star incorporates edges at multiple orientations. It can be used to analyze spatial frequency response in different directions and provides additional information for sagittal and tangential SFR analysis.

04｜4:1 and 6:1 Edge Reflectance Ratios

Two edge reflectance ratio options are available for the ISO 12233:2023 e-SFR Standard Test Chart:

⦁ CS-TC009: 4:1 edge reflectance ratio

⦁ CS-TC009-R: 6:1 edge reflectance ratio

The appropriate version can be selected according to the specific test application and test conditions.

05｜1X / 2X / 4X Sizes

Available in 1X, 2X, and 4X sizes to accommodate different camera fields of view, working distances, and test configurations.

06｜Reflective Test Chart

The chart uses a reflective test format and is suitable for standardized image quality testing of digital cameras, camera modules, and other imaging systems.

ISO 12233 eSFR Test Chart（4:1） CS-TC009	ISO 12233 eSFR Test Chart（6:1） CS-TC009-R

Measurable Parameters

By capturing images of the e-SFR test chart and analyzing them with image quality analysis software such as the Imatest eSFR ISO module, the following parameters can be measured and evaluated.

01｜Sharpness and Resolution

⦁ e-SFR (Edge Spatial Frequency Response)

⦁ SFR (Spatial Frequency Response)

⦁ MTF (Modulation Transfer Function)

⦁ Spatial frequency response at different image-field positions, including the center, edges, and corners

⦁ Spatial frequency response in different orientations, including vertical, horizontal, and diagonal directions

02｜Lateral Chromatic Aberration

⦁ Lateral Chromatic Aberration (LCA) — supported by the slanted-edge structure of the e-SFR test pattern

03｜Distortion

⦁ Distortion — low-order distortion analysis

04｜Noise：Using the center gray patch, the test setup can be used to evaluate:

⦁ Standard pixel noise

⦁ Color noise

⦁ Scene-referred noise

⦁ Sensor raw noise

⦁ Visual noise and dynamic range

⦁ Signal-to-Noise Ratio (SNR), expressed as a ratio or in dB

04｜Tonal Response and Sensitivity：Using the 16-step grayscale patch, the test setup can be used to evaluate

⦁ Tonal Response

⦁ OECF (Opto-Electronic Conversion Function)

⦁ Gamma / Average Slope

⦁ ISO Speed, including saturation-based and standard output sensitivity methods, with illuminance input as required

Technical Specifications

Product	ISO 12233 eSFR Test Chart
Model	CS-TC009 / CS-TC009-R
Size	1X	2X	4X
Overall Dimensions	240mm × 340mm	480mm × 680mm	960mm × 1360mm
Chart Type	Reflective
Edge Reflectance Ratio	CS-TC009       4:1 CS-TC009-R    6:1
Related Standard	ISO 12233:2023 — Photography — Electronic still picture imaging — Resolution and spatial frequency responses

Test Setup and Use

01｜Test Conditions：

⦁ For e-SFR testing, set appropriate working distance, field of view, illumination conditions, and exposure parameters according to the camera and test system being evaluated.

02｜Test Chart Illumination：

⦁ Ensure that the test chart surface is uniformly illuminated during testing. Avoid direct light entering the camera lens and minimize the effects of ambient stray light and unwanted reflections on the measurement results.

03｜Image Capture：

⦁ When capturing test images, avoid significant overexposure, underexposure, or cropping of the test chart.After image acquisition, use image quality analysis software such as the Imatest eSFR ISO module to process the test image and analyze the e-SFR results.

【Reserve a Lab】For more information about related products and testing services, please contact：sales@colorspace.com.cn

Follow ColorSpace for  industry news/events/solutions