Detail Preserving Image Transfer Operations

An image enhancement method, comprising:

• obtaining an input image;
• obtaining an image enhancement transfer function;
• applying an edge-preserving operation to the input image to generate a filtered input image;
• determining a second transfer function that approximates the edge-preserving operation based, at least in part, on the input image and the filtered input image;
• applying the image enhancement and second transfer functions to the input image to generate an intermediate image;
• determining a detail information image corresponding to the input image based, at least in part, on the input image and the filtered input image;
• and
• incorporating the detail information image into the intermediate image to generate an output image.

A non-transitory program storage device, readable by a processor and comprising instructions stored thereon to cause one or ore processors to:

• obtain an input image;
• obtain an image enhancement transfer function;
• apply an edge-preserving filter to the input image to generate a filtered input image;
• determine a second transfer function that approximates the edge-preserving filter based, at least in part, on the input image and the filtered input image;
• determine a third transfer function that approximates the edge-preserving filter based, at least in part, on the input image and an image resulting from application of the image enhancement transfer function to the filtered input function;
• and
• generate an output image corresponding to the input image based, at least in part, on the second and third transfer functions.

An image enhancement method, comprising:

• obtaining an input image;
• obtaining an image enhancement transfer function;
• applying an edge-preserving filter to the input image to generate a filtered input image;
• determining a second transfer function that approximates the edge-preserving filter based, at least in part, on the input image and the filtered input image;
• determining a third transfer function that approximates the edge-preserving filter based, at least in part, on the input image and an image resulting from application of the image enhancement transfer function to the filtered input function;
• and
• generating an output image corresponding to the input image based, at least in part, on the second and third transfer functions.

An electronic device, comprising:

• one or more memories;
• and
• one or more processors coupled to the one or more memories and adapted to execute program code stored therein, the program code including instructions to cause the one or more processors to—
• obtain an input image from the one or more memories;
• obtain an image enhancement transfer function;
• apply an edge-preserving filter to the input image to generate a filtered input image;
• determine a second transfer function that approximates the edge-preserving filter based, at least in part, on the input image and the filtered input image;
• determine a third transfer function that approximates the edge-preserving filter based, at least in part, on the input image and an image resulting from application of the image enhancement transfer function to the filtered input function;
• generate an output image corresponding to the input image based, at least in part, on the second and third transfer functions;
• and
• store the output image in the one or more memories.