There is provided is a method for enhancing a video image capable of achieving high image quality improvement for both a texture area and an edge area. A maximum limit value and a minimum limit value of a video signal value enhanced on the basis of a pixel signal value in an area set around the target pixel are calculated, the maximum limit value and the minimum limit value are corrected according to a texture value calculated as a scale value that indicates a variation of the pixel signal value in the corresponding area, and the corrected maximum limit value and minimum limit value are applied to the enhanced video signal value.

There is provided is a method for enhancing a video image capable of achieving high image quality improvement for both a texture area and an edge area. A maximum limit value and a minimum limit value of a video signal value enhanced on the basis of a pixel signal value in an area set around the target pixel are calculated, the maximum limit value and the minimum limit value are corrected according to a texture value calculated as a scale value that indicates a variation of the pixel signal value in the corresponding area, and the corrected maximum limit value and minimum limit value are applied to the enhanced video signal value.

A method for shadow correction verification parameter determination, the method comprising: obtaining correction data in each block of a plurality of correction images, the correction data comprising luma information and color information; wherein the luma information is the ratio of a luma to a luma of a center block, and the color information is a ratio of a color value to a color value of the center block; and calculating at least one set of standard values and deviation values of each block by using the luma information and the color information in each block of the plurality of correction images and taking the at least one set of standard values and deviation values to be correction verification parameters in the shadow correction verification.

A method for shadow correction verification parameter determination, the method comprising: obtaining correction data in each block of a plurality of correction images, the correction data comprising luma information and color information; wherein the luma information is the ratio of a luma to a luma of a center block, and the color information is a ratio of a color value to a color value of the center block; and calculating at least one set of standard values and deviation values of each block by using the luma information and the color information in each block of the plurality of correction images and taking the at least one set of standard values and deviation values to be correction verification parameters in the shadow correction verification.

A contour enhancement processing circuit includes a crisp circuit for removing a noise component from a contour component signal using a crisp signal for removing a noise component in the contour component signal and outputting a contour signal, a crisp gain control circuit for obtaining a gain for controlling amplification of a signal becoming the basis of the crisp signal according to a video level and outputting the gain as a crisp gain, a multiplier for multiplying the crisp gain and the signal becoming the basis of the crisp signal and outputting a crisp signal to the crisp circuit, a gain circuit for amplifying the contour signal from which a noise component is removed in the crisp circuit, and an adder for adding the video signal transmitted from a delay circuit and the amplified contour signal transmitted from the gain circuit and outputting a contour-enhanced video signal.

A contour enhancement processing circuit includes a crisp circuit for removing a noise component from a contour component signal using a crisp signal for removing a noise component in the contour component signal and outputting a contour signal, a crisp gain control circuit for obtaining a gain for controlling amplification of a signal becoming the basis of the crisp signal according to a video level and outputting the gain as a crisp gain, a multiplier for multiplying the crisp gain and the signal becoming the basis of the crisp signal and outputting a crisp signal to the crisp circuit, a gain circuit for amplifying the contour signal from which a noise component is removed in the crisp circuit, and an adder for adding the video signal transmitted from a delay circuit and the amplified contour signal transmitted from the gain circuit and outputting a contour-enhanced video signal.

This invention discloses an image processing method and an image processing device for filtering images. The image processing method includes the following steps: (A) generating a weight for each reference pixel, the image including multiple reference pixels and the magnitude of the weight being associated with a similarity between the reference pixel to which the weight corresponds and a target pixel; and (B) performing an infinite impulse response (IIR) filtering operation according to the weights, a pixel value of the target pixel, and the pixel values of the reference pixels to obtain an IIR-filtered value of the target pixel.

This invention discloses an image processing method and an image processing device for filtering images. The image processing method includes the following steps: (A) generating a weight for each reference pixel, the image including multiple reference pixels and the magnitude of the weight being associated with a similarity between the reference pixel to which the weight corresponds and a target pixel; and (B) performing an infinite impulse response (IIR) filtering operation according to the weights, a pixel value of the target pixel, and the pixel values of the reference pixels to obtain an IIR-filtered value of the target pixel.

Disclosed is a display apparatus and a method of controlling the same. The display apparatus include an image receiver configured to receive an omnidirectional image; an image processor configured to perform an image process with regard to the received image; a display configured to display an image based on the image process; and a controller configured to control the image processor to perform a second image process for changing a characteristic of a certain area of the image and to perform a first image process for changing pixel density. Thus, there is provided a display apparatus and a method of controlling the same to perform an image processing to improve image quality without distortion or nonuniformity of an image.

There is disclosed an image processing method in which a video signal is inputted from an imaging optical system in which astigmatism remains, and is displayed on a two-dimensional display apparatus. Based on the circumferential direction modulation factor and radial direction modulation factor of a lens used in the imaging optical system, a signal including the amount of vertical or horizontal modulation factor correction proportional to an nth power (n is an integer greater than 1) of a distance from a center position of a screen of the two-dimensional display apparatus is outputted for at least one vertical or horizontal frequency of the two-dimensional display apparatus.