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Method for doubling the vertical refresh rate of an image sequence generated in an interlaced scanning process

A technology of image repetition and interlaced scanning, applied in image communication, color TV parts, TV system parts, etc., can solve problems such as flickering, short-term loss, distortion, etc.

Inactive Publication Date: 2004-05-05
MICRONAS
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  • Claims
  • Application Information

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Problems solved by technology

The problem with this approach is that vertical brightness jumps on vertical motion will have strong edge flickering
Also, dashes in the width of a line are lost when using the method
This leads to noticeably visible distortion especially when fading fonts

Method used

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  • Method for doubling the vertical refresh rate of an image sequence generated in an interlaced scanning process
  • Method for doubling the vertical refresh rate of an image sequence generated in an interlaced scanning process
  • Method for doubling the vertical refresh rate of an image sequence generated in an interlaced scanning process

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Embodiment Construction

[0047] Figures 1(a) and (b) show two mutually dependent field images in a full frame image produced by the interlaced scanning method. The lines of the individual field pictures are offset from each other. If they are displayed in rapid succession, the full frame image shown in Fig. 1(c) is obtained as a combination of these two field images.

[0048] Fig. 2 (a) and (b) represent two field images according to Fig. 1 (a), (b), wherein each pixel of these two field images is represented by a solid circle. In Fig. 2 (a), (b), an interpolated field image is shown for each field image, wherein each pixel of each interpolated field image is represented by a dotted circle. In this way, a full-frame image is generated from each field image of the original image sequence, which can be displayed as a whole as shown in Fig. 2(a), (b) or also in an interlaced manner. In this case, first display the field image of Fig. 2(a), then display the interpolated field image, then display the int...

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Abstract

A method for doubling the vertical refresh rate of an image sequence generated in an interlaced scanning process, whereby said image sequence consists of image segments in the form of pixel signals. According to said method, at least one image segment (H) preceding a respectively real image segment (A) is stored. A first image segment which is complementary to said real image segment (A) is generated in the form of pixels by comparing the pixel signals of the real image segment (A) with pixel signals from the stored image segment (H). A second image segment which is complementary to the real image segment (A) is generated for each pixel by forming a mean value of two pixel signals for pixels of the real image segment (A) whereby the pixels thereof are vertically adjacent thereto. A pixel of the first or second complementary image segment is selected according to spatial and temporal modification of the pixel signals and vertically adjacent pixels.

Description

technical field [0001] The invention relates to a method for doubling the image repetition frequency of an image sequence produced by an interlaced scanning method in field images in the form of a dot signal, wherein at least the field image preceding each current field image is stored, and wherein The first field image interpolated to the current field image by pixel is generated by comparing the pixel signal of the current field image with the pixel signal of the stored field image. Background technique [0002] This method can be used, for example, in televisions or computer monitors. At present, 25 frames of images are usually sent to the TV set per second. In the case of this so-called full frame frequency of 25 Hz, the viewer perceives the image frames as almost separate single images and thus perceives strong flickering. In order to reduce flicker, a so-called interlaced scanning method is used, in which each full-frame image is transmitted as two successively trans...

Claims

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Application Information

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IPC IPC(8): H04N5/21H04N5/14H04N5/44H04N7/01
CPCH04N7/0132H04N7/01
Inventor 钱德愉
Owner MICRONAS
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