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i have used dwt2 function for my input image? for approximation level i am getting blank image. what sould i do ?

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Shan Sha
Shan Sha am 23 Okt. 2018
Kommentiert: Shan Sha am 23 Okt. 2018
i have used dwt2 function for my input image? for approximation level i am getting blank image. what should i do ? i have attached the output image and the input image. i used default function. please do suggest me an idea

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Rik
Rik am 23 Okt. 2018
Your image is not white. imshow assumes your data is scaled from 0 to 1 if it is a double, while your data is clearly not from 0 to 1.
imshow(A,[0 255])%scale to uint8 range, change to [] for auto-scaling.

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