Getting data from an image with rainbow scale

Hello,

I have a colorful image which represents a data set with rainbow scale. I want to pick a point on the image and to learn the value of there. How can I do that ?

You can find an example which is close to my image.

Thanks

[KALYAN ACHARJYA]

"learn the value of there"

What does it mean?

[Baris Kirim]

As you see the example image, there is a scale at the right hand side. blue is 28.6 and red is 63.4. This is the temperature data of the objects. I want to pick a point on the image and learn the temperature of the point.

Answer 1

[KALYAN ACHARJYA]

Please follow the following steps:

• Load the images (imread function)
• imshow(image_data)
• improfile function
• 2 click (without mouse movemnet ) on the image (any point)

Code:

image_data=imread('image file name'); 
imshow(image_data)
data_val=improfile

Result: Check in command window or data_val as per the above snippet

[Baris Kirim]

Thanks for your reply,

As you see the example image, there is a scale at the right hand side. blue is 28.6 and red is 63.4. This is the temperature data of the object. I want to pick a point on the image and learn the temperature of the point.

Your code is extract the RGB values but It seems like I need a calibration by using a scale bar on the image.

Thanks.

Answer 2

[Image Analyst]

After you display the image, call impixelinfo:

hp = impixelinfo

As you mouse around, the value will show up in a status line somewhere on the figure. You can resize and position that status line by setting the Position Property if you want.

hp.Units = 'normalized';
hp.Position = [0.5, 0.97, 0.2, 0.1]; % [x, y, width, height]