how to calculate vertical and horizontal projection histogram for an image

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Jyoti
Jyoti 2012-4-17
评论： Image Analyst 2016-1-20
Hi guys I am doing a project on offline signature recognition and verification. I hove done till thining process of an image. Now i need to calculate vertical and horizontal projection histogram for this image. Can any body suggest me some code for this. Thanks.

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Jakob Sørensen
Jakob Sørensen 2012-4-17
Let me see if I get this right... You want to make a histogram, but instead of having a color intensity as bin numbers, you want to use the different rows/columns for bins?
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Rageeni sah
Rageeni sah 2014-4-17
Hello there, I want to know that when we plot horizontal/vertical histogram of an image, what information can we get from the histogram??
Image Analyst
Image Analyst 2014-4-17
I don't think he meant histogram. He probably just doesn't know the the proper terminology. If you sum an image across or down you get the profile or projection, not histogram. If you have a binary image of text, then the histogram of the projections doesn't really tell you much of any use . But by looking at the projection you can determine where lines of text start and stop. Start your own thread and post your own image if you want specific help.

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Rujal
Rujal 2016-1-20
can anyone please help me to create feature vector of vertical and horizontal projection histogram. please give me a matlab code on rujubhandari007@gmail.com . . . Thanks in advance
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Image Analyst
Image Analyst 2016-1-20
Not sure what that means. A projection of data along a dimension, and a histogram (frequency distribution) are different things. Start your own question and attach your data and what you'd like to get from it.

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Walter Roberson
Walter Roberson 2012-4-17
sum(YourImage,1) %vertical projection
sum(YourImage,2) %horizontal projection
This assumes YourImage is binary. If it isn't, you need to define what you mean by "projection" of multiple colors.
si sam
si sam 2015-10-8
to Jyoti : did you get it?
Paramesh
Paramesh 2015-10-16
I got it.Nice.

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