Mat::convertTo() float to uchar broken when all values are negative (Bug #1218)
| Status: | Done | Start date: | |
|---|---|---|---|
| Priority: | Normal | Due date: | |
| Assignee: |  Vadim Pisarevsky |
% Done: | 0% |
| Category: | core | ||
| Target version: | - | ||
| Affected version: | Operating System: | ||
| Difficulty: | HW Platform: | ||
| Pull request: |
Description
When all values in a floating point matrix are negative, the resulting uchar matrix is all zero.
History
Updated by Vadim Pisarevsky over 13 years ago
uchar can only represent values from 0 to 255. Negative values are converted to the closest representable value, i.e. 0. Try converting floats to signed char (CV_8S) or use convertScaleAbs().
- Status changed from Open to Done
- (deleted custom field) set to invalid