How to concat Mat1's top half with Mat2's bottom half

asked 2018-10-26 04:56:53 -0600

BALAKRISHANAN NAGARAJAN
16

updated 2018-10-26 05:02:00 -0600

berak
32993 ●7 ●81 ●312

Hi All,

Greeting.

I have a 2 mats, in opencv android

Mat1 = Mat(width,height,CvType.cv.8U); Mat2 = Mat(width,height,CvType.cv.8U);

I did submat on Mat1 & Mat2. Mat3 = Mat1.submat(0,height/2,0,width); Mat4 = Mat2.submat(height/2,height,0,width);

Created Array list Mat5 to hold Mat3 & Mat4.

When i Tried vconcat(Mat5,DstMat); i am getting Assertion failed error. Please tell me whether the approach i did was correct or any thing anything went wrong.

Thanks in Advance.

edit retag flag offensive close merge delete

add a comment

2 answers

Sort by » oldest newest most voted

answered 2018-10-28 10:01:11 -0600

BALAKRISHANAN NAGARAJAN
16

@berak. Sorry for not sharing the code. i figured it by my self. On Mat2 I have done Imgprog to convert inputFrames to RGB. On Mat3 I have done Imgprog to convert inputFrames to Gray. When i concat both different converted color it thrown error.

Now i made both to same color(i.e RGB). It worked. So while doing concat, if there were any imgprog on any mat, the same should be on the other mat.

Thanks for your time in spending time on this query.

Cheers :)

edit flag offensive delete link

Comments

solved, then ;)

berak ( 2018-10-28 10:22:19 -0600 )edit

add a comment

answered 2018-10-26 05:04:24 -0600

berak
32993 ●7 ●81 ●312

updated 2018-10-26 05:22:16 -0600

take a look at the docs, vconcat and hconcat need a list of mats as 1st arg (in java)

also:

Mat(h,w,type);

edit flag offensive delete link

Comments

Thanks for your swift reply. In the above Mat5 is array of list. it holds Mat3 and Mat4. I am aware of using it. When i concat submat of same Mat(say for example mat2 alone) i am not facing any issue. But when i use two different mat (here it is Mat2 and Mat1), i am getting error.

BALAKRISHANAN NAGARAJAN ( 2018-10-26 05:13:09 -0600 )edit

sorry, but you have to be more concise. when you do what, exactly, you get which error ?

berak ( 2018-10-26 05:23:16 -0600 )edit

No prob :). Hope now you understood my problem. Any guess on resolution please.

BALAKRISHANAN NAGARAJAN ( 2018-10-26 05:25:08 -0600 )edit

for vconcat, both Mat's need the same width, for hconcat the same height

berak ( 2018-10-26 05:33:32 -0600 )edit

Here both the Mat's width remains same as it is vconcat. I didnt make any mistake on that.

BALAKRISHANAN NAGARAJAN ( 2018-10-26 05:37:44 -0600 )edit

can you do is a favour, and edit your question, and put the exact code you're using, and the exact error , please ?

berak ( 2018-10-26 05:40:34 -0600 )edit

add a comment

How to concat Mat1's top half with Mat2's bottom half

2 answers

Comments

Comments

Links

Question Tools

Stats

Related questions

How to concat Mat1's top half with Mat2's bottom half edit

2 answers

Comments

Comments

Links

Question Tools

Stats

Related questions

How to concat Mat1's top half with Mat2's bottom half