DMOS values in LIVE IQA Database has negative values












2















I'm working on Image Quality Assessment with LIVE Database. I'm validating a QA algorithm, which is non-linearly dependent on subjective scores (DMOS values). So, I'm trying to fit a curve to find the equation of a curve, I'm taking log on both x and y axes which gives me a linear fit.
But for JPEG Img14 and Img58 have negative DMOS values (-0.19 & -2.64 respectively).




  1. What does this mean? Does it mean that JPEG compressed image is better in quality than original image?

  2. This is causing me problem while taking log and then using power. How do I fix this issue?


Thanks!






image image-processing jpeg qa







share|improve this question



























    2















    I'm working on Image Quality Assessment with LIVE Database. I'm validating a QA algorithm, which is non-linearly dependent on subjective scores (DMOS values). So, I'm trying to fit a curve to find the equation of a curve, I'm taking log on both x and y axes which gives me a linear fit.
    But for JPEG Img14 and Img58 have negative DMOS values (-0.19 & -2.64 respectively).




    1. What does this mean? Does it mean that JPEG compressed image is better in quality than original image?

    2. This is causing me problem while taking log and then using power. How do I fix this issue?


    Thanks!






    image image-processing jpeg qa







    share|improve this question

























      2












      2








      2








      I'm working on Image Quality Assessment with LIVE Database. I'm validating a QA algorithm, which is non-linearly dependent on subjective scores (DMOS values). So, I'm trying to fit a curve to find the equation of a curve, I'm taking log on both x and y axes which gives me a linear fit.
      But for JPEG Img14 and Img58 have negative DMOS values (-0.19 & -2.64 respectively).




      1. What does this mean? Does it mean that JPEG compressed image is better in quality than original image?

      2. This is causing me problem while taking log and then using power. How do I fix this issue?


      Thanks!






      image image-processing jpeg qa







      share|improve this question














      I'm working on Image Quality Assessment with LIVE Database. I'm validating a QA algorithm, which is non-linearly dependent on subjective scores (DMOS values). So, I'm trying to fit a curve to find the equation of a curve, I'm taking log on both x and y axes which gives me a linear fit.
      But for JPEG Img14 and Img58 have negative DMOS values (-0.19 & -2.64 respectively).




      1. What does this mean? Does it mean that JPEG compressed image is better in quality than original image?

      2. This is causing me problem while taking log and then using power. How do I fix this issue?


      Thanks!






      image image-processing jpeg qa




      image image-processing jpeg qa






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 25 '18 at 18:54









      Nagabhushan S NNagabhushan S N

      469414




      469414
























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