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A question about applying retina to a single picture

I have tried to apply retina to a single picture. As the cycle index being increased, the output of "Retina Magno" changed consistently and at last the output was a black image. I want to know why that happens. So I read the article "Using Human Visual System modeling for bio-inspired low level image processing" and find this image. But the question still puzzle me. Could you give me some directions?

A question about Why the output of "Retina Magno" changed consistently when applying retina to a single picture

I have tried to apply retina to a single picture. picture with default parameters. As the cycle index being increased, the output of "Retina Magno" changed consistently and at last the output was a black image. I want to know why that happens. So I read the article "Using Human Visual System modeling for bio-inspired low level image processing" and find this image. But the question still puzzle me. Could you give me some directions?

Why the output of "Retina Magno" changed consistently when applying retina to a single picture

I have tried to apply retina to a single picture with default parameters. As the cycle index being increased, the output of "Retina Magno" changed consistently and at last the output was a black image. I want to know why that happens. So I read the article "Using Human Visual System modeling for bio-inspired low level image processing" and find this image. .

But the question still puzzle me. Could you give me some directions?

my second question: Please look at this picture.

OPL transfer function is shown in Fig4b. With the time goes by, I think the frequency tend to zero. And I think the FOPL is similar with the parvo output according to Fig11a. But the magno output is zero in the end! Could you tell me where the problems are? Maybe I misunderstood the author's intentions.

Why the output of "Retina Magno" changed consistently when applying retina to a single picture

I have tried to apply retina to a single picture with default parameters. As the cycle index being increased, the output of "Retina Magno" changed consistently and at last the output was a black image. I want to know why that happens. So I read the article "Using Human Visual System modeling for bio-inspired low level image processing" and find this image.

But the question still puzzle me. Could you give me some directions?

my second question: Please look at this picture.

OPL transfer function is shown in Fig4b. With the time goes by, I think the frequency tend to zero. And I think the FOPL is similar with the parvo output according to Fig11a. But the magno output is not the parvo output become zero in the end! Could you tell me where the problems are? Maybe I misunderstood the author's intentions.