Scaling the values to specific range

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Pat 2012-11-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54325-scaling-the-values-to-specific-range

Q=[ 0.0669
    0.0383
    0.0029
   -0.0344
   -0.0554
   -0.0459
   -0.0316
    0.0086
    0.0392
    0.0650
    0.0698
    0.0478
    0.0201
   -0.0134
   -0.0468
   -0.0583
   -0.0468
   -0.0229
    0.0115]
I want to scale the value of Q in range [-(2^13-1),(2^13-1)]
please help

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Walter Roberson 2012-11-21

I can't be bothered to research dwt2() to find out what the possible theoretical output ranges are for each possible class of input data. How about if you just state the value ranges and any specific encoding instructions ?

Pat 2012-11-21

在 MATLAB Online 中打开

walter these are coefficients from dwt2
S=[ 0.0038
    0.0019
    0.0105
    0.0048
    0.0038
   -0.0105
   -0.0134
   -0.0191
   -0.0258
   -0.0229
   -0.0086
   -0.0076
   -0.0086
   -0.0010
    0.0038
    0.0048
    0.0019
   -0.0038
   -0.0086
   -0.0029
    0.0038
    0.0086
    0.0096
    0.0124
    0.0057
    0.0067
   -0.0010
    0.0029
    0.0086
    0.0057]
from this i have to sample in that range i.e in 14 bit range .
for 16 bit i have performed
D1=int16(S*32768);please tell how to perform for 14 bit

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采纳的回答

Harshit 2012-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/54325-scaling-the-values-to-specific-range#answer_66036

D1=int16(S*32768) maps your any integer S*32768 outside the range to 32768 or for S>1 the output will be 32768(2^15) otherwise it will be round off to the nearest integer(You are assuming maximum non saturating input is 1 beyond this there will be saturation). You can see simply use max(round(2^13*S),2^13). Hope it will be fine.

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Pat 2012-11-21

ok thanks a lot harshit my final question,i have performed operation on cA,if i am usind idwt2,have i to perform same operation for ch,cV,cD for effictive reconstruction,else performing on cA is enough

Harshit 2012-11-26