Neighbors - Intro to Java Programming Udacity English English (auto-generated)

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Education 2.9K views 4 likes 3 dislikes 23 Feb 2015

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When you have a picture, you can think of it as a giant two-dimensional array

when you have a picture you can think of

of colors. It's a little tedious to work with the colors because they have red,

it as a giant two-dimensional array of colors it's a little tedious to work

blue, and green components. Here, we'll just use grayscale. Each element in the

with the colors because they have red blue and green components here we'll just use grayscale each element in the

two-dimensional array will represent a gray level. As an integer between zero

two-dimensional array will represent a gray level as an integer between 0 and

and 255. Now, here's the problem that we want to solve, we have a photo, which

255 now here's the problem that we want to solve we have a photo which is

is represented as a two-dimensional array, of lots of grey level. And now we

represented as a 2-dimensional array of lots of gray levels and now we want to

want to make it a little blockier. When I have groups of four neighbors like

make it a little block here when I have

this, I want to compute the average color or rather the average gray level of

groups of 4 neighbors like this I want to compute the average color or rather

these four pixels and color them all in that color. And this is, I'm making

the average gray level off these 4 pixels and color them all in that color

every pixel a bit fatter. Let me blow this up a little. So here are the pixel,

in essence I'm making every pixel a bit fatter let me blow this up a little to

and I want to know, what are it's three neighbors to the right, to the bottom,

hear of a pixel and I want to know what are its three neighbors to the right to

and diagonally. So let's assume the one that I'm starting with is pixels ij,

the bottom and diagonally so let's assume the one that I'm starting with

that means my row is i, and my column is j. Let's look at the one to the right.

his pixels IJ that means my row is I and my column is J let's look at the one to

The row number is the same, and the column number has increased by one. So here

the right the row number is the same and the column number has increased by one

it is in Java. Same row, column increased by one. What about the one to the

so here it is in Java same row column increased by one what about the one to

south? In this case, the column index j is the same. And the row index has

the south in this case the column index J is the same and the row index has

increased by one. So here's the java code for that. Finally, the diagonal one

increased by one so here's the Java code for that

has both the row and column index increase by one. And I'll leave it to you in

finally the diagonal one has both the row and column index increased by one and I'll leave it to you in the next lab

the next lab exercise to figure that out. So go ahead and. Program this exercise. You need to traverse the first pixel here then you jump by two each

exercise to figure that out so go ahead and program this exercise you need to traverse the first pixel here then you

time and also the columns you go down by two columns each time. In each step

jump by two each time and also with the columns you go down by two columns each

you average these four pixels, compute the average value and stick it back into

time in each step you average these four pixels compute the average value and

all four pixels. Don't worry the friendly

stick it back into all four pixels don't

worry they're friendly relations have

have given you some code to start with.

given you some code to start with

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