Signal processing method to selectively record image signals

• US 20040136687A1
• Filed: 12/29/2003
• Published: 07/15/2004
• Est. Priority Date: 01/02/2003
• Status: Abandoned Application

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Ju, Chi-Cheng
• Application Number:
  US10/745,598
• Publication Number:
  US 20040136687A1
• Time in Patent Office: Days
• US Class Current: 386/46
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/587 involving temporal sub-sampling or interpolation, e.g. decimation or subsequent interpolation of pictures in a video sequence
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 9/7921 for more than one processing mode
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

This invention provides a signal processing method for image signals. This method selectively records the image signals on a recording medium. The image signals contain at least two image signals with different original image frame rate. After a signal converting process, the original image frame rate will be adjusted to a standard image frame rate specified by an image system standard. At first, this method detects the image signals according to a detection process in order to distinguish at least one image signal with one original image frame rate in the image signals with at least two original image frame rates. After the process of image detection, this method records only desired image signals on the recording medium according to an image selection information.

Claims

1. A signal processing method for selectively recording image signals on a recording medium, the image signals comprising at least two kinds of image signals, respectively with different original image frame rate;

after a signal converting procedure, the original image frame rate of the image signals being adjusted to meet a standard image frame rate specified by an image system standard, the signal processing method comprising;

according to an image signal detecting procedure, detecting the image signals to determine at least one image signal with one particular original image frame rateout of the image signals with at least two original image frame rates; and

after the image signal determination, recording only the desired image signals on the recording medium according to an image selection information.

2. The signal processing method of claim 1, wherein the image signals comprise film signals with a slower original image frame rate and video signals with a faster original image frame rate, and the number of picture frames per unit time for film signals is less than the number of picture frames per unit time for video signals.

3. The signal processing method of claim 2, wherein the signal converting process repeats certain fields of the film signals to meet the standard signal frame rate specified by the image system standard.

4. The signal processing method of claim 2, wherein the video signal is a NTSC video signal.

5. The signal processing method of claim 2, wherein the video signal is a PAL video signal.

6. The signal processing method of claim 1, wherein the signal converting process is telecine procedure.

7. The signal processing method of claim 3, wherein the detecting procedure is to continuously detect the image signals, and determine the image signals as the film signals if they have repetitive fields, and then record the film signals on the recording medium according to the image selection information.

8. The signal processing method of claim 3, wherein the detecting procedure is to continuously detect the image signals and determine the image signals as the film signals if they have repetitive fields, and then not to record the film signals on the recording medium according to the image selection information.

9. The signal processing method of claim 3, wherein the detecting procedure is continuously detect the image signals and determine the image signals as the video signals if they do not have repetitive fields, and then record the video signals on the recording medium according to the image selection information.

10. The signal processing method of claim 3, wherein the detecting procedure is to continuously detect the image signals and determine the image signals as the video signals if they do not have repetitive fields, and then not to record the video signals on the recording medium according to the image selection information.

11. The signal processing method of claim 3, wherein the image signals comprise a plurality of different scenes and each scene comprises the plurality of picture frames.

12. The signal processing method of claim 11, wherein the signal processing method is to detect the scene change by a scenes change detection procedure.

13. The signal processing method of claim 12, wherein only when the scene change detection procedure has detected scene change happening in the image signals, then the detecting procedure begins to detect the image signals and to identify the image signals as the film signals if repetitive fields are found and then to record the scene on the recording medium.

14. The signal processing method of claim 12, wherein only when the scene change detection procedure has detected scene change happening in the image signals, then the detecting procedure begins to detect the image signals and to identify the image signals as the film signals if repetitive fields are found and then not to record the scene on the recording medium.

15. The signal processing method of claim 12, wherein only when the scene change detection procedure has detected scene change happening in the image signals, then the detecting procedure begins to detect the image signals and to identify the image signals as the video signals if no repetitive fields are found and then to record the scene on the recording medium.

16. The signal processing method of claim 12, wherein only when the scene change detection procedure has detected scene change happening in the image signals, then the detecting procedure begins to detect the image signals and to identify the image signals as the video signals if no repetitive fields are found and then not to record the scene on the recording medium.

17. An image signal recording apparatus for selectively recording image signals on a recording medium, the image signals comprising at least two kinds of image signals, respectively with different original image frame rate;

after a signal converting procedure, the original image frame rate of the image signals being adjusted to meet a standard image frame rate specified by an image system standard, the signal recording apparatus comprising;

a detecting/determining module to receive and detect the image signals, to determine at least one image signal with one particular original image frame rate out of the image signals with at least two original image signal frame rates, and to determine the image signals desired to be recorded; and

a recording module to record only the desired image signals on the recording medium when receiving the desired image signals;

wherein the detecting/determining module selects the desired image signals according to an image selection information and controls the recording module for recording.

18. The signal recording apparatus of claim 17, wherein the image signals comprise film signals with a slower original image frame rate and video signals with a faster original image frame rate, and the number of picture frames per unit time for film signals is less than the number of picture frames per unit time for video signals.

19. The signal recording apparatus of claim 18, wherein the video signal is a NTSC video signal.

20. The signal recording apparatus of claim 18, wherein the video signal is a PAL video signal.