Image track display apparatus

• US 4,951,137 A
• Filed: 03/31/1989
• Issued: 08/21/1990
• Est. Priority Date: 03/31/1988
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Takeuchi, Hisaharu, Yoda, Shinji, Ikeda, Kazumasa, Shimoda, Kenji, Kisou, Masaaki
• Primary Examiner(s): Peng, John K.
• Application Number:
  US07/331,319
• Time in Patent Office: 508 Days
• Field of Search: 358/105, 358/107, 358/3, 358/125, 358/22, 358/167, 358/166, 358/36, 358/37, 358/330, 358/340, 352/121, 434/369, 273/DIG. 28
• US Class Current: 348/169
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Abstract

Image track display apparatus including a memory for delaying an image signal by at least one vertical scanning period, a first subtraction circuit for taking a first difference signal between the image signal and its delayed image signal through the memory. The first difference signal includes first and second polarity components, a non-linear processing circuit for multiplying the one polarity component of the first difference signal by K times (0<K<1) and for reducing the other polarity component of the first difference signal to the zero value when the other polarity component exceeds a prescribed value, a second subtraction circuit for taking a second difference signal between the output signal of the non-linear processing circuit and the image signal, and a display device for displaying the delayed image signal obtained through the memory circuit.

Claims

1. Image track display apparatus comprising:

means for receiving an image signal;

memory means for delaying the image signal by at least one vertical scanning period;

a first subtraction means for taking a first difference signal between the image signal and the delayed image signal, the first difference signal including first and second polarity components;

a non-linear processing means for multiplying one polarity component of the first difference signal by K times (0<

K<

1) and for reducing the other polarity component of the first difference signal to the zero value when the other polarity component exceeds a prescribed value;

a second subtraction means for taking a second difference signal between the output signal of the non-linear processing means and the image signal; and

means for displaying the delayed image signal obtained through the memory means.

2. Image track display apparatus of claim 1 wherein the non-linear processing means includes means for storing specified processing data to process the image signal and means for selectively inverting the processing data obtained from the data storing means and for processing the first difference signal on the basis of the inverted data of the specified processing data.

3. Image track display apparatus of claim 1 wherein the non-linear processing means includes linear means for processing a negative component of the first difference signal when the luminance level of the moving image is higher than the background image and for processing a positive component of the first difference signal when the luminance level of the moving image is lower than the background image.

4. Image track display apparatus comprising:

means for receiving an image signal;

memory means for delaying the image signal by at least one vertical scanning period;

a first subtraction means for taking a first difference signal between the image signal and the delayed image signal;

a first weighting means for weighting the first difference signal by K times when the first difference signal is lower than a prescribed value;

a second subtraction means for taking a second difference signal between the K times weighted signal and the image signal;

a first detection means for detecting the maximum value by comparing the image signal with the delayed image signal and for weighting the maximum signal by M times when the first difference signal is larger than the prescribed value;

a second detection means for detecting the minimum value by comparing the image signal with the delayed image signal and for weighting the minimum value by (1+(1-M)) times when the first difference signal is larger than the prescribed value;

a first selection means for selecting one of the M time signal and the (1+(1-M)) time signal;

a second selection means for selecting one of the selected signal and a subtraction signal between the image signal and the K time signal of the first difference signal and for applying the selected signal to the memory means; and

means for displaying the delayed image signal obtained through the memory means.

5. Image track display apparatus of claim 4 further comprising means for selecting the maximum value when the luminance level of moving image is higher than the background level and selecting minimum value when the luminance level of moving image is lower than the background level.