how to calculate vertical and horizontal projection histogram for an image

2012 4 17
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更新时间：2016 1 20
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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

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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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Jyoti
Jyoti 2012-4-17
Hi Jakob
Thanks for the cosideration to my question.You are actually getting it right.here i want to use different rows/columns for bins.so that i can calculate horizontal and vertical projection histograms and then i also need to find the maximum horizontal and maximum vertical projection.
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

1 个投票

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

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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.
Paramesh
Paramesh 2015-10-16

0 个投票

I got it.Nice.

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si sam
si sam 2015-10-21
i would be thankful if can you please show me how you drew vertical and horizontal histograms?

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