Getting data from an image with rainbow scale

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Baris Kirim
Baris Kirim 2020-12-29
回答： Image Analyst 2020-12-30
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
  2 个评论
Baris Kirim
Baris Kirim 2020-12-29
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.

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回答（2 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2020-12-29
编辑：KALYAN ACHARJYA 2020-12-29
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
  1 个评论
Baris Kirim
Baris Kirim 2020-12-29
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.

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Image Analyst
Image Analyst 2020-12-30
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]

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