Apparatus for compensating contour of television signal

• US 4,912,556 A
• Filed: 02/23/1989
• Issued: 03/27/1990
• Est. Priority Date: 08/28/1986
• Status: Expired due to Fees

• Current Assignee: Nippon Hoso Kyokai, Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Nippon Hoso Kyokai, Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Izumi, Yoshinori, Ohtsuka, Yoshimichi, Ninomiya, Yuichi, Hirauchi, Yoshio
• Primary Examiner(s): Shepperd, John W.
• Assistant Examiner(s): Parker, Michael D.
• Application Number:
  US07/314,182
• Time in Patent Office: 397 Days
• Field of Search: 358/12, 358/37, 358/96, 358/105, 358/162, 358/166, 358/133, 358/140, 358/135, 358/138
• US Class Current: 348/629
• CPC Class Codes: H04N 5/208 for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction

Abstract

There is provided an apparatus for compensating a contour of a television signal in a TV signal processing apparatus in which a predetermined control signal including a field interpolation control signal to control an interpolating method when reconstructing by an interpolation an image signal which was band compressed by the sub-Nyquist sampling is time sharingly multiplexed for a blanking period, wherein a signal of a still area processed by a still image system processing circuit and a signal of an animation area processed by an animation image system processing circuit are mixed by a mixing circuit every pixel, when the mixed signal is used as an input signal to the subsequent circuits, the OR of the binary signal of the movement amount and the field interpolation control signal transmitted from the transmission side is calculated, the still and animation areas are distinguished by the OR signal, and a contour is emphasized by a two-dimensional contour compensating circuit for the signal in the animation area.

Claims

1. An apparatus for compensating a contour of a television signal in an apparatus for processing a television signal in which a predetermined control signal including at least a field interpolation control signal to control an interpolating method when reconstructing by an interpolation an image signal which was band compressed by executing a sub-Nyquist sampling is time sharingly multiplexed for a blanking period, said compensating apparatus comprising:

an animation image system processing circuit to process an animation area of an input image signal;

a still image system processing circuit to process a still area;

a mixing circuit to mix output signals of both of said processing circuits;

a movement amount detecting circuit to generate a movement amount signal to change a mixture ratio in said mixing circuit in accordance with a movement;

a binarizing circuit for receiving the movement amount signal as an output of said movement amount detecting circuit and binarizing;

a two-dimensional contour compensating circuit for receiving an output of the mixing circuit as an input signal and for two-dimensionally emphasizing a contour of an image; and

a switch for selecting either one of the output signal of the mixing circuit and an output signal of said two-dimensional contour compensating circuit on the basis of an OR of an output signal of said binarizing circuit and the field interpolation control signal which is transmitted by being multiplexed to the image signal from the transmission side.