Introduction to ISO12233:2014 eSFR Resolution Test Card

The SineImage eSFR resolution test card, when combined with software, can automatically calculate several key image quality factors including sharpness, lateral color difference, tone response, color response, and noise.

Fully compatible with the low contrast Edge SFR specification, the new standard replaces the 2000 standard with ISO 12233:2014. This is because the previous use of high contrast test charts could easily cause out of bounds or measurement errors, and lacked the tone response of the progressive group evaluation system, with only a few functions suitable for automatic analysis.

The design of SineImage eSFR resolution test card is based on the low contrast edge SFR specification defined in ISO 12233:2014.

There are three versions of the test card:

Standard Edition: Basic functions

Enhanced EditionAdded additional squares, wedges, and color patterns

Extended EditionSimilar to the enhanced version, but extended to 16:9, suitable for high-definition movies and movies

At present, we produce eSFR resolution test cards using inkjet printing, and the enhanced version is printed in camera mode. All Sine Image's ISO12233:2014 eSFR resolution test cards are fully compliant with ISO standards. Imatest's eSFR ISO module provides highly automated support for detecting, analyzing, and testing cards.

Standard Edition

The ISO 12233:2014 eSFR Resolution Test Card Standard Edition has an aspect ratio of 3:2. In order to meet more testing requirements, we have added enhanced and extended versions. The enhanced and extended versions have added blocks, hyperbolas, and color blocks for testing performance at the edges of the image. These graphics cards are fully compliant with the standards.

ISO12233:2014 eSFR is similar to a low contrast E-SFR test card made according to Section 6.1 and Appendix C of ISO standard documents. But there are a few differences. Here are their different comparisons:

(1) The 20th order OECF gray scale block has replaced the original 16th order gray scale block

(2) The square focusing pattern in the center area of the test card is right angled (to increase the measurement area of MTF), designed to reduce interference from automatic edge detection.

(3) There are four focus marks, replacing the original three to assist in automated area detection.

(4) There is an additional mark above the focus mark in the lower left corner for detecting the direction of the chart.

This test card is used for the full-automatic eSFR ISO module, which is added to Imatest 4.0.

Enhanced Edition

The enhanced 2014 eSFR test card has all the features of the standard version and a 3:2 aspect ratio. Six tilted blocks were added at the edges of the image for performance testing, and hyperbolas were added for visual analysis or analysis on the hypotenuse module of Imatest. Also added 16 color blocks. These additional areas are not covered by the standards, but it does not affect compliance with the standards. The differences between the enhanced and standard versions are as follows:

(1) Six additional tilted blocks were added at the edges of the image to test performance.

(2) Hyperbolic curves of several spatial frequencies, similar to CIPA referencing ISO standards, used for visual analysis or analysis in the hypotenuse module of Imatest software.

(3) Added 16 color blocks (inkjet or color LVT), with colors similar to the industry standard 24 color card

This version of the resolution test card is used for the full-automatic eSFR ISO module, which is added to Imatest 4.0.

Extended Edition

The extended version of ISO12233:2014 eSFR resolution test card includes all the features of the enhanced version (6 diagonal blocks, hyperbolas, and 16 color blocks), but the aspect ratio is extended to 16:9. 16: 9 is designed to be suitable for high-definition televisions and movies (also meeting the 3:2 aspect ratio required by cameras). It also meets the standards.

This version of the test card is used for the full-automatic eSFR ISO module, which is added to Imatest 4.0.

ISO12233:2014 eSFR Resolution Test Card Dimensions

ISO12233:2014 eSFR Resolution Test Card Usage Help

There are nine tilted rectangles in the test chart, with a contrast ratio of 4:1. The OECF progressive group is applied, and the edges of the tilted rectangles can be used to test spatial frequency response and lateral color difference. All rectangles have focusing assistance suitable for manual or automatic focusing.

The 20 level grayscale OECF pattern surrounds the center of the chart, used to measure the tone response, gamma, white balance, and noise characteristics of the imaging system, measure the average arrangement of plate radioactivity, and reduce measurement errors caused by light attenuation. The noise testing series covers a wide range, including density, scene reference raw pixel noise, ISO 15739 visual noise, signal-to-noise ratio, and dynamic range.

SineImage provides two additional eSFR test card versions, which optimize and extend the test card with extra space in addition to meeting standards. There are six additional angled rectangles for measuring sharpness outside the imaging area.

Four alignment marks are used for automatic detection of Imatest eSFR ISO module functionality

Sixteen color blocks represent the colors of real-life scenes, used to analyze and present accurate or preferred colors.

According to another part of the ISO standard, four pairs of hyperbolic wedges have been added to test the limit resolution and cloud patterns.

The ratio of the optimized test image for the enhanced version of the ISO12233:2014 eSFR resolution test card is 3:2, while the extension test image for the ISO12233:2014 eSFR resolution test card expansion board is 16:9, supporting imaging systems with wider viewing angles.