Bug in the user_guide (Bug #2570)

Added by Igor Kushnir over 12 years ago. Updated about 12 years ago.

Status:	Cancelled	Start date:	2012-11-26
Priority:	Normal	Due date:
Assignee:	Kirill Kornyakov	% Done:	0%
Category:	documentation
Target version:	2.4.3.2
Affected version:		Operating System:
Difficulty:		HW Platform:
Pull request:

Description

On page http://docs.opencv.org/doc/user_guide/ug_mat.html

double minVal, maxVal;
minMaxLoc(sobelx, &minVal, &maxVal); //find minimum and maximum intensities
Mat draw;
sobelx.convertTo(draw, CV_8U, 255.0/(maxVal - minVal), -minVal);

last line should be

   sobelx.convertTo(draw, CV_8U, 255.0/(maxVal - minVal), -minVal * 255.0/(maxVal - minVal));

  const double alpha = 255.0/(maxVal - minVal);
  sobelx.convertTo(draw, CV_8U, alpha, -minVal * alpha);

Original line performs: color_intensity(x,y) = color_intensity(x,y) * alpha - minVal; - which I believe isn't intended.

Related issues

duplicates Bug #2559: User Guide bug

Done

2012-11-20

Associated revisions

Revision 3f417f1e
Added by Vsevolod Glumov about 12 years ago

Fixes for issues #2570, #2492, #2559, #2489, #2592.

History

#1
Updated by Kirill Kornyakov over 12 years ago

Description changed from On page http://docs.opencv.org/doc/user_guide/ug_mat.html ... double minVal,... to On page http://docs.opencv.org/doc/user_guide/ug_mat.html <pre> double... More
Target version set to 2.4.4
Category set to documentation
Subject changed from user_guide to Bug in the user_guide