Image gamma correction method, scanning card, and display system

A technology for gamma correction and card scanning, applied to static indicators, instruments, etc., to solve the problems of loss of display image quality, inability to obtain gamma correction tables, etc., to improve user experience

Active Publication Date: 2017-08-18
XIAN NOVASTAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide an image gamma correction method, a scanning card, and a display system to solve the problem of display image quality loss due to failure to obtain a new gamma correction table

Method used

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  • Image gamma correction method, scanning card, and display system
  • Image gamma correction method, scanning card, and display system
  • Image gamma correction method, scanning card, and display system

Examples

Experimental program
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no. 1 example

[0017] Such as figure 1 As shown, an image gamma correction method provided in the first embodiment of the present invention includes the following steps:

[0018] S11: obtain a plurality of input parameter values;

[0019] S13: judging whether the current multiple input parameter values ​​have changed;

[0020] S15: Map each gray scale in the input source gray scale bit number to the preset highest gray scale bit number range according to the obtained current brightness adjustment amount and the current gamma value, and according to the acquired current target gray scale bit number pair Quantize each gray level after mapping to obtain the current gamma correction table;

[0021] S17: Perform gamma correction on the input source image according to the current gamma correction table.

[0022] To facilitate a clearer understanding of this embodiment, specific examples are given below to describe the foregoing steps S11-S17 in detail.

[0023] In step S11, the multiple input ...

no. 2 example

[0030] Such as image 3 As shown, a scan card 30 in the second embodiment of the present invention includes: a programmable logic device 31 , a controller 33 and a memory 35 .

[0031] The scan card 30 of this embodiment can implement the image gamma correction method of the aforementioned first embodiment. Specifically, the programmable logic device 31 is connected to the controller 33 and the memory 35 and is, for example, an FPGA (Field Programmable GateArray, Field Programmable Gate Array) device; the controller 33 is connected to the memory 35 and is, for example, an MCU; the memory 35 is, for example, a RAM (RAM). The controller 33 of this embodiment can calculate the gamma correction table in real time according to external variables such as brightness adjustment value, gamma value and target gray scale bit number, and then store the calculation result in the memory 35 in real time to obtain the current gamma correction table , the programmable logic device 31 reads t...

no. 3 example

[0034] Such as Figure 4 As shown, a display system 40 in the third embodiment of the present invention includes: a scanning card 41 , a HUB board (or adapter board) 43 and an LED display screen 45 .

[0035] Wherein, the HUB board 43 is connected between the scanning card 41 and the LED display screen 45 . HUB board 43 among the present embodiment is mainly used as the usefulness of interface expansion; Scanning card 41 can be the scanning card 30 of aforementioned second embodiment, and it can carry out image gamma correction to input source image; LED display screen 45 passes HUB board 43 receives the image data output by the scanning card 41 for screen display, which includes, for example, one or more LED boxes, and each LED box includes one LED light board or multiple cascaded LED light boards. It can be understood here that for a large-resolution LED display screen, it can be equipped with multiple scanning cards 41, and is not limited to Figure 4 A scan card 41 is sh...

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Abstract

The invention discloses an image gamma correction method. The image gamma correction method comprises steps that a plurality of input parameter values are acquired; whether the plurality of input parameter values are changed is determined; when at least one of the input parameter values is changed, every gray scale of an input source gray scale bit number is mapped in a preset highest gray scale bit number range according to an acquired current brightness adjusting quantity and a current gamma value, and every gray scale after the mapping is quantified to acquire a current gamma correction table according to an acquired current target gray scale bit number; and gamma correction of an input source image is carried out according to the current gamma correction table. The invention also discloses a scanning card and a display system, which adopt the above mentioned image gamma correction method.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an image gamma correction method, a scanning card and a display system. Background technique [0002] With the development of LED display technology, LED displays are currently being applied to various fields due to their advantages of low cost, low power consumption, high visibility, and free assembly. At the same time, with the popularization of LED display applications, people have higher and higher requirements for its display quality. Therefore, how to improve the display quality of LED display screens has become a research hotspot in this field. One of the more difficult problems currently exists is that the grayscale transition is not smooth and there is a phenomenon that the continuous multi-level grayscale does not change. This phenomenon is particularly prominent in the low grayscale segment. One of the reasons for this problem is Gamma correction. Not done well. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G2320/0276
Inventor 刘德福廖明进
Owner XIAN NOVASTAR TECH
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