OECF 動態范圍 測試卡 36 ISO 14524/15739 IEC 62676-5

For high dynamic range cameras, the OECF charts with patches calculated according to ISO 14524 are not that convincing. Densities are calculated according to the cube root formula result in large steps in the high-density patches. Image Engineering’s solution for the problem is the TE269, a 36 patch OECF chart which basically follows ISO 14524 but implements additional steps especially at higher density levels.

Our OECF charts have the advantage of a stable production process and being strongly neutral. In addition, very high dynamic ranges up to more than 1.000.000: 1 / 120dB are achievable.

The TE269 transparent test charts can be illuminated with our iQ-LED based illumination device LE7.

The Analysis is implemented in the Image Engineering iQ-Analyzer software. For instance, it provides the following results:
OECF, dynamic range, SNR, noise, temporal noise, visual noise

Technical information

• These transparent test charts are available in size D280
• The aspect ratio of the test pattern is 16:9 with integrated markers for 4:3 and 3:2 formats
• 36 patches with densities from 0.03 up to more than 6 (for 1.000.000:1 / 120dB and higher)
• The standard version of TE269 uses a screening to form the gray levels

The three variants available are:

TE269A

Gray patches according to ISO 14524.

TE269B

Better differentiation of the dark patches. The steps are based on the supporting points of the TE264 (20 patch chart) with a spreading of the steps in between.

TE269C

According to the upcoming standard IEC 62676-5: Video surveillance systems for use in security applications – Part 5: Data specifications and image quality performance for camera devices, this chart is adapted to the postulated requirements.