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Format conversion circuit applied to set top box and related method

A format conversion and set-top box technology, applied in the direction of color signal processing circuits, televisions, electrical components, etc., can solve problems such as images that cannot be displayed well, adjustment functions are not perfect, and display quality is affected.

Active Publication Date: 2019-07-05
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the set-top box can convert the image signal into a format suitable for TV playback, the maximum brightness output by it may still be different from the maximum brightness that the display panel of the TV can display, so the image will not be displayed well; in addition , even if the TV has the function of re-adjusting the brightness, if the adjustment function is not perfect, the display quality may still be affected

Method used

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  • Format conversion circuit applied to set top box and related method
  • Format conversion circuit applied to set top box and related method
  • Format conversion circuit applied to set top box and related method

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Embodiment Construction

[0030] figure 1 is a block diagram of a format conversion circuit 100 according to an embodiment of the present invention. Such as figure 1 As shown, the format conversion circuit 100 includes an electro-optical transfer function (Electro-Optical Transfer Function, EOTF) circuit 110, a color space conversion circuit 120, a mapping circuit 130 and a photoelectric conversion function (Optical-Electro Transfer Function, OETF) circuit 140. In this embodiment, the format conversion circuit 100 is arranged in a set-top box, and is used to convert an input image signal with a high dynamic range (HDR) format into an output image signal with a standard dynamic range (SDR), and convert the generated The output image signal is transmitted to the back-end display 102 through the output circuit of the set-top box for display; in addition, in this embodiment, the display 102 is a TV. However, in other embodiments, the format conversion circuit 100 may be disposed in an image processing d...

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Abstract

The invention discloses a format conversion circuit applied to a set top box, the set top box is coupled to a display, and the format conversion circuit comprises an electro-optical conversion function circuit, a mapping circuit and a photoelectric conversion function circuit. Wherein the electro-optical conversion function circuit is used for converting an input image signal with a first format into a first optical signal; the mapping circuit is coupled to the electro-optical conversion function circuit and is used for converting the first optical signal into a second optical signal with a second format, and at least one of the first optical signal and the second optical signal is generated according to the maximum brightness of the display; and the photoelectric conversion function circuit is coupled to the mapping circuit and is used for converting the second optical signal into an output image signal.

Description

technical field [0001] The invention relates to a set-top box, in particular to a format conversion circuit applied in the set-top box. Background technique [0002] In recent years, some image signals have adopted a high dynamic range (High Dynamic Range, HDR) format. Compared with the traditional standard dynamic range (Standard Dynamic Range, SDR) (for example, the range is about 0-1000 nits), the high dynamic range (for example, the range is about 0-10000 nits) can make the displayed image have higher contrast and a clearer picture. Since not all current TVs support high dynamic range formats, if the TV is equipped with a set-top box, the set-top box will convert the received image signal into an image signal suitable for the format supported by the TV, that is, the set-top box can convert the image signal Convert from high dynamic range to standard dynamic range, and can also convert image signals from standard dynamic range to high dynamic range. However, even if th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/268H04N9/64H04N21/41H04N21/426
CPCH04N5/268H04N9/643H04N21/4104H04N21/426
Inventor 彭俊康
Owner MEDIATEK INC