convert an image into binary matrix and visualize the coordinate of each pizel

Hello guys,

I have an image .jpg format, i use this code to convert into a matrix. I think with this code i get with 1 the position of pixel and with zero ( no pixel ):

I = imread('origianl_picture.jpg');
BW = imbinarize(I);

what i am looking for is to convert the 1 and 0 into cartesian coordinate ( x,y,z) also i would like to visualize the binary images, a matrix with the 3 coordianate corresponding with the position of pixel.

I attached original jpg but i cannot do it with the binary one, basically i display the same but in black and white.

Can u please help me with this?

Thanks

Answer 1

[KALYAN ACHARJYA]

To visulise the binary use it

BW = imbinarize(I)

or

I = imread('origianl_picture.jpg');
BW = imbinarize(I);
imshow(BW)

2nd one:

"what i am looking for is to convert the 1 and 0 into cartesian coordinate ( x,y,z)"

The image is 2D only, hence you get the spatial co-ordinates of the binary image, having white pixels (Black)

I = imread('origianl_picture.jpg');
BW = imbinarize(I);
[y x]=find(BW==1);

Or Are you looking for different? Be specific please.

[Danilo Sanfilippo]

Many thanks for getting back

as you can see i have already part of the code and i obtain a huge matrix 342x480x3 made by 0 and 1. i am looking to display each position of pixel with cartesian coordinate

Do this line of code provide me the coordinate of pixel?

[x y]=find(BW==1); 

and also display the resultant binary image ( display BW)

I tried imshow(BW) but i display error

Error using images.internal.imageDisplayValidateParams>validateCData (line 119)
If input is logical (binary), it must be two-dimensional.
Error in images.internal.imageDisplayValidateParams (line 27)
common_args.CData = validateCData(common_args.CData,image_type);
Error in images.internal.imageDisplayParseInputs (line 78)
common_args = images.internal.imageDisplayValidateParams(common_args);
Error in imshow (line 245)
    images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});
Error in origianl_picture (line 3)
imshow(BW) 

thanks

[KALYAN ACHARJYA]

"i am looking to display each position of pixel with cartesian coordinate"

Are you interested for all pixels positions, whether black or white?

Then its simple

1,1 1,2 1,3.....

2,1, 2,2.....

.......

2nd Question:

imshow(BW) 

is Ok, check the code carefully

[Danilo Sanfilippo]

i have this huge matrix made by zero and 1, 1 display a pixel, but a need the coordinate of that.

this is part of what i obtain:

val(:,:,1) =
  Columns 1 through 32
   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0
   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1   1   1   1   0   0   0   0   0   0   1   1   1   1   0   0   1
   0   0   0   0   0   0   0   0   0   0   1   1   1   1   1   1   1   1   0   1   0   0   0   0   0   1   1   1   1   1   1   1

for each of this value i would like to have the coordinate as:

     index pixel	x	y
        1	0	0
        2	1	3
        3	4	5
        4	1	4
        5	3	4
        6	5	7
        7	1	0

2 answer

of course it is type correctly because i copy and paste from the answer.

thanks all of you guys

[Image Analyst]

Kalyan, note that find() does not return (x,y) -- it returns (y, x).

[KALYAN ACHARJYA]

Yes sir, Thanks

[Danilo Sanfilippo]

That's all correct, just

imshow(BW)

doesn't work.

i got this error:

Error using images.internal.imageDisplayValidateParams>validateCData (line 119)
If input is logical (binary), it must be two-dimensional.

Error in images.internal.imageDisplayValidateParams (line 27)
common_args.CData = validateCData(common_args.CData,image_type);

Error in images.internal.imageDisplayParseInputs (line 78)
common_args = images.internal.imageDisplayValidateParams(common_args);

Error in imshow (line 245)
    images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});

Error in origianl_picture (line 6)
imshow(BW)
 

could someone help me, please?

[KALYAN ACHARJYA]

Share the complete code?

[Danilo Sanfilippo]

clc;
clear all;
I = imread('origianl_picture.jpg');
BW = imbinarize(I);
[y x]=find(BW==1);
imshow(BW)