log function behavior differs from documentation, returns -inf for 0 value elements (Bug #4319)

Added by Louis Bouchard almost 10 years ago. Updated over 9 years ago.

Status:New Start date:2015-05-06
Priority:Normal Due date:
Assignee:Vadim Pisarevsky % Done:

0%
Category:documentation
Target version:3.0
Affected version:branch 'master' (3.0-dev) Operating System:Windows
Difficulty: HW Platform:x64
Pull request:

Description

As per the documentation (http://docs.opencv.org/3.0-beta/modules/core/doc/operations_on_arrays.html#log), the log function should return -700 for elements of the input array that are 0.

In the current stable version (3.0-rc1) however, the function returns -INF for zero values.

This has an impact on TonemapDurand::process(), where BilateralFilter() is called on the result of a log() which returns -INF values when process is called on a grayscale image. BilateralFilter() crashes on arrays containing -INF values. Perhaps BilateralFilter() is not working as intended either.

thank you

History

#1
Updated by Vadim Pisarevsky almost 10 years ago

the crash in TonemapDurand is now avoided: https://github.com/Itseez/opencv/pull/4018. The documentation still needs to be changed

  • Category changed from core to documentation

#2
Updated by Maksim Shabunin over 9 years ago

Issue has been transferred to GitHub: https://github.com/Itseez/opencv/issues/4982

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