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Gray-scale correcting device
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Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of grayscale correction and correction value, which is used in cathode ray tube indicators, televisions, instruments, etc.
Inactive Publication Date: 2010-12-22
PANASONIC CORP
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[0013] However, since the above-mentioned conventional structure calculates the histogram data to create the correction table, it takes one field of processing time
Method used
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no. 1 approach
[0067] figure 1 It is a diagram showing the configuration of the gradation correction device according to the first embodiment of the present invention. Such as figure 1 As shown, the gray scale correction device is composed of a change calculation unit 11 , a change storage unit 12 , a change comparison unit 13 , a histogram memory 14 , a correction value calculation unit 15 , a lookup table memory 16 and a control unit 17 .
[0068] The input signal received by the variation calculation unit 11 is a digitized luminance signal. The change amount calculation unit 11 calculates the average value of the screen and the motion vector in units of frames from the input luminance signal as the change amount. Sampling pulses required for calculation and synchronization signals serving as horizontal and vertical references are supplied from the control unit 17 .
[0069] The change amount storage unit 12 stores the change amount such as the average value and the motion vector calc...
no. 2 approach
[0085] The configuration of the gradation correction device according to the second embodiment of the present invention is different from that of the first embodiment in that the correction value calculation unit has a table correction unit and a correction table. The following description will focus on the configuration of the correction value calculation unit. Unless otherwise specified here, the configuration of the gradation correction device of this embodiment is the same as that of the first embodiment.
[0086] Figure 4 It is a diagram showing the configuration of the correction value calculation unit of the gradation correction device according to the second embodiment of the present invention.
[0087] Such as Figure 4 As shown, the correction value calculation unit 15 has: an accumulation unit 21 , a correction value calculation table storage unit 22 , a table selection unit 23 , a light correction table 41 , a dark correction table 42 , and a table correction uni...
no. 3 approach
[0102] The configuration of the gradation correction device according to the third embodiment of the present invention is different from that of the first embodiment in that the correction value calculation unit includes a flicker detection unit. The following description will focus on the configuration of the correction value calculation unit, but unless otherwise specified here, the configuration of the gradation correction device of this embodiment is the same as that of the first embodiment.
[0103] Image 6 It is a diagram showing the configuration of the correction value calculation unit 15 of the gradation correction device according to the third embodiment of the present invention.
[0104] Such as Image 6 As shown, the correction value calculation unit 15 includes an accumulation unit 21 , a correction value calculation table 22 , a table selection unit 23 and a flicker detection unit 61 . Image 6 The accumulation unit 21, the correction value calculation table s...
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Abstract
The variation computed by a variation computing section (11) is stored in a variation storage section (12). A variation comparing section (13) compares the variation in a frame one before the frame for which gray-scale correction is performed and the frame two before. If the variation is lager than a predetermined value, the correction value data for the frame one before is not used, and a correction value table for the frame before the variation is selected from a correction value computing section (15) and read out. If the variation is smaller than the predetermined value, the correction value table for the frame one before where the variation is small is read from the correction value computing section (15) and written in a look-up table (16). Correction data (level data) is read out of the address of the look-up table (16) and outputted as a luminance signal after the gray-scale correction. Gray-scale correction is performed after selecting the most-suitable correction data depending on the frame for which gray-scale correction is performed according to the variation of the screen, and most-suitable gray-scale correction can be performed without any frame memory.
Description
technical field [0001] The present invention relates to a gradation correction device for correcting the gradation of brightness of an image signal using a histogram. Background technique [0002] Conventionally, a method of performing gradation correction of an image signal using a histogram (distribution of luminance of the image signal) is known. The basic concept of gradation correction using a histogram is as follows. The frequency of occurrence of each luminance signal level is calculated from the input image signal, and a histogram is created. This histogram data is accumulated from low brightness to make a cumulative histogram. This cumulative histogram is normalized to obtain the cumulative luminance distribution. A normalized cumulative histogram is calculated such that the maximum value of the cumulative luminance distribution reaches the maximum value of the output luminance level. The gradation correction of the image signal is performed using the accumulate...
Claims
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