CalcHist throw expection (Bug #2241)

Added by wuling Chang over 12 years ago. Updated over 12 years ago.

Status:Cancelled Start date:2012-08-05
Priority:Normal Due date:
Assignee:- % Done:

0%
Category:imgproc, video
Target version:2.4.3
Affected version: Operating System:
Difficulty: HW Platform:
Pull request:

Description

Hi all:
My operation os:windows 7 x64 using opencv x86.

I using below list,it works well.

1calcHist(&c1,1,0,Mat(),hist,1,&histSize,&histRange,true,true);

But I change ninth parameters from "true" to "flase", then throw expection.
1calcHist(&c1,1,0,Mat(),hist,1,&histSize,&histRange,false,true);

未命名.bmp (1.5 MB) wuling Chang, 2012-08-05 05:13 am

Associated revisions

Revision 7161b5bb
Added by Roman Donchenko about 11 years ago

Merge pull request #2241 from asmorkalov:ocv_highgui_test_output_fix

History

#1
Updated by wuling Chang over 12 years ago

Hi

There are some different in opencv2refman.pdf & opencv_tutorials.pdf.

In opencv2refman page 274, where example:

1MatND hist;
2// we compute the histogram from the 0-th and 1-st channels
3int channels[] = {0, 1};
4calcHist( &hsv, 1, channels, Mat(), // do not use mask
5hist, 2, histSize, ranges,
6true, // the histogram is uniform
7false );

In opencv_tutorials.pdf page 215,example:
1Mat b_hist, g_hist, r_hist;
2
3//Compute the histograms:
4calcHist( &bgr_planes[0], 1, 0, Mat(), b_hist, 1, &histSize, &histRange, uniform, accumulate );
5calcHist( &bgr_planes[1], 1, 0, Mat(), g_hist, 1, &histSize, &histRange, uniform, accumulate );
6calcHist( &bgr_planes[2], 1, 0, Mat(), r_hist, 1, &histSize, &histRange, uniform, accumulate );

I am so confused to declare variable.

#2
Updated by Marina Kolpakova over 12 years ago

Did you change histRanges according to not uniforme case usage?

If you use uniform variant of function your range should contain only lower bound for 0-bin and upper bound for last bin. So it's 2 values for each dimension. But for not uniform variant you should specify lower and upper bounds for each bin for each dimension.

  • Description changed from Hi all: My operation os:windows 7 x64 using opencv x86. I using below list,i... to Hi all: My operation os:windows 7 x64 using opencv x86. I using below list,i... More
  • Category set to imgproc, video

#3
Updated by wuling Chang over 12 years ago

Hi ,
dear Marina,
I think i am wrong. I don't change histRanges,I try again and
Mat b_hist, g_hist, r_hist; //just for one channel
MatND hist; //for muti-channels

Thanks.

#4
Updated by Marina Kolpakova over 12 years ago

  • Target version set to 2.4.3
  • Status changed from Open to Cancelled

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