Custom ROI for imatest Chart detection ?

Hello,

I would like to know if there is a way to use a custom version of the imatest test chart ( 1:1 with different positions of squares) and feeds eSfrChart function the new position of ROIs to perform all its analysis (sfr, noise, etc) on those new positions.

It semes to me that the function can only detect the 16:9 regular format with standart grey square positions.

Thank you in advance !

Answer 1

[Garmit Pant]

Hello corentin lefebvre

MATLAB function “eSfrChart” only supports the ‘Enhanced’ and ‘Extended’ versions of the eSFR test chart from Imatest. These test charts are based on the ISO 12233:2014 standard test. The function can store additional features like color ROIs and slanted edge ROIs.

Currently, the function does not have the support for custom charts. Additionally, the function supports 3:2 and 4:3 aspect ratio for the Extended eSFR chart. However, 1:1 charts are not supported. Please refer to the ‘Tips’ section of the following MATLAB documentation:

https://www.mathworks.com/help/releases/R2020b/images/ref/esfrchart.html

In the latest release R2024a, the style of the test chart is automatically detected and set to be one of the 4 supported styles, "Enhanced", "Extended", "WedgeEnhanced", or "WedgeExtended". This can also be manually set by using the “Style” name-value argument.

For further understanding, you can also refer to the latest version of the MATLAB documentation for “eSfrChart” function:

https://www.mathworks.com/help/images/ref/esfrchart.html

I hope you find the above explanation and suggestions useful!