Method and device for converting image resolution, and electronic device having the device
A method for converting an image resolution converts a low resolution image into a high resolution image, generates a second high resolution image by compensating an image quality of the high resolution image, and selectively compensating, by using information about a specific region included in the low resolution image, a region which is included in the second high resolution image and corresponds to the specific region.
1. A method for converting an image resolution, comprising:
converting a low resolution image into a high resolution image;
generating a second high resolution image by compensating an image quality of the high resolution image; and
selectively compensating a second region, which is included in the second high resolution image and corresponds to a first region included in the low resolution image, based on information about the first region,
wherein the generating the second high resolution image includes:
removing visual artifacts, included in the high resolution image, to generate a first high resolution image; and
enhancing details and sharpness of the first high resolution image to generate the second high resolution image,
wherein the enhancing the details and the sharpness includes:
sampling a high frequency component of a texture portion, included in the first high resolution image;
calculating an average gradient compensation value of an edge portion, included in the first high resolution image; and
adjusting the details and the sharpness by using the sampled high frequency component and the average gradient compensation value, and
wherein the sampling the high frequency component includes:
low-pass filtering the first high resolution image;
high-pass filtering the first high resolution image; and
calculating a difference, between a low pass filtered first high resolution image and a high pass filtered first high resolution image, to sample the high frequency component.
2. A method for converting an image resolution, comprising:
converting a low resolution image into a high resolution image;
generating a second high resolution image by compensating an image quality of the high resolution image; and
selectively compensating a second region, which is included in the second high resolution image and corresponds to a first region included in the low resolution image, based on information about the first region,
wherein the generating the second high resolution image includes:
removing visual artifacts, included in the high resolution image, to generate a first high resolution image; and
enhancing details and sharpness of the first high resolution image to generate the second high resolution image,
wherein the enhancing the details and the sharpness includes:
sampling a high frequency component of a texture portion, included in the first high resolution image;
calculating an average gradient compensation value of an edge portion, included in the first high resolution image; and
adjusting the details and the sharpness by using the sampled high frequency component and the average gradient compensation value, and
wherein the adjusting the details and the sharpness adjusts the details and the sharpness by subtracting the sampled high frequency component and the average gradient compensation value from the first high resolution image.