Complex image compression
View Patent ↗Complex image data is transformed to a holographic representation of the image. A subset of the holographic representation is modeled. Model parameters constitute a compressed image representation. A two-dimensional Fourier transform can be applied to obtain the holographic image. Modeling includes applying an analysis portion of an adaptive analysis/synthesis linear prediction methodology to a subset of the holographic representation to obtain an autoregressive model. Prior to modeling, one-dimensional Fourier transform can be performed on the holographic representation and the linear prediction is one-dimensional. Model parameters are preferably quantized. Embodiments include determining error between the model and the model's input data. There the compressed image representation the error, which also can be quantized. The subset of the holographic representation can be less than all the representation. The subset can be a plurality of complete rows; preferably substantially symmetric about 0 Hz.
1. A computer implemented method of image processing, the method comprising:
transforming, by the computer, complex data of an image to a holographic representation of the image, wherein said complex data includes phase information;
modeling, by the computer, a subset of the holographic representation using autoregressive modeling to form a model having model parameters;
determining, by the computer, a prediction residual between the model and input data to the model; whereby the model parameters and prediction residual constitute a compressed representation of the image;
synthesizing, by the computer or a different computer, a holographic representation from the model and prediction residual; and
transforming, by the computer or the different computer, the synthesized holographic representation to a set of complex data of the image,
wherein the set of complex data of the image preserves the phase information of the complex data of the image.
2. The method of claim 1 wherein transforming the complex data comprises applying, by the computer, a two-dimensional Fourier transform to obtain the holographic representation of the image; and modeling comprises one-dimensional modeling.
3. The method of claim 1 wherein transforming the complex data comprises applying, by the computer, a two-dimensional transform to obtain the holographic representation of the image.
4. The method of claim 3 further comprising, prior to modeling, performing, by the computer, a one-dimensional Fourier transform on the holographic representation; and wherein modeling comprises one-dimensional modeling.
5. The method of claim 1 further comprising communicating the model parameters and prediction residual to the different computer.
6. A non-transitory computer-readable medium for image processing comprising:
a transform module transforming complex data of an image to a holographic representation of the image, wherein said complex data includes phase information;
a modeling module modeling a subset of the holographic representation by applying autoregressive modeling to the subset of the holographic representation to form a model having model parameters, and determining a prediction residual between the model and the input data to the model, whereby the model parameters and prediction residual constitute a compressed representation of the image; and
a synthesis module synthesizing a holographic time series representation from the model parameters and prediction residual, and transforming the synthesized holographic time series representation to a set of complex data of the image,
wherein the set of complex data of the image preserves phase information of the complex data of the image.
7. The non-transitory computer-readable medium of claim 6 wherein transforming complex data comprises applying a two-dimensional Fourier transform to obtain the holographic representation of the image; and modeling comprises one-dimensional modeling.
8. The non-transitory computer-readable medium of claim 6 wherein transforming complex data comprises applying a two-dimensional transform to obtain the holographic representation of the image.
9. The non-transitory computer-readable medium of claim 8 further comprising, prior to modeling, performing a one-dimensional Fourier transform on the holographic representation; and wherein modeling comprises one-dimensional modeling.