Device and method for image contrast reinforcement
An image and conversion device technology, applied in the direction of luminance and chrominance signal processing circuits, etc., can solve the problem that the brightness of the color may not be as expected by the viewer, and the displayed image is not ideal.
Active Publication Date: 2009-07-01
MEDIATEK INC
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[0008] However, while adjusting the brightness of the displayed image and compensating for the chroma of the displayed image through the extraction of bar charts, the brightness of the displayed image may not be what the viewer expects, that is, the brightness of the color on the displayed image may not be accurate. what viewers expect
Therefore, the display images presented by existing methods are still not ideal.
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[0056] Please refer to image 3 , is a schematic diagram of an image contrast enhancement device according to a preferred embodiment of the present invention. The contrast enhancement device 300 is composed of a brightness definition conversion device 310 , a brightness contrast adjustment device 320 and a brightness and color compensation device 330 . Wherein, the brightness definition conversion device 310 is composed of multipliers 311, 313, 315 and an adder 317; the brightness contrast adjustment device 320 is composed of a bar chart extraction device 321 and a brightness curve device 323; a brightness and color compensation device 330 It is composed of an arithmetic unit 331 and multipliers 333 , 335 , and 337 .
[0057] For a flowchart of the operation of the contrast enhancement device 300, please refer to Figure 4 , is an operation flowchart of the contrast enhancement device in a preferred embodiment of the present invention. First, in step 401 , the multipliers 3...
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The invention relates to a device for image contrast enhancement, comprising: a brightness definition conversion device, which receives a first brightness signal, a first saturation signal and a second saturation signal to output a second brightness signal; a brightness contrast adjustment device, which receives the first brightness signal Two luminance signals to output a third luminance signal; and a luminance and color compensation device that receives the first luminance signal, the first chroma signal, the second chroma signal, the second luminance signal and the third luminance signal to obtain Outputting the fourth luminance signal, the third chroma signal and the fourth chroma signal. The present invention defines a luminance signal including chroma weighted values, and the newly defined luminance signal can be used as the compensation for displaying the original luminance signal and chroma signal of the image through the extraction of the bar chart and the proportional relationship before and after the luminance curve processing. parameters, therefore, the processed display image has a better saturation, which is more in line with the needs of the viewer.
Description
technical field [0001] The present invention relates to a device and method for image contrast enhancement, in particular to an image contrast enhancement device and method for additionally defining a brightness signal as a compensation parameter. Background technique [0002] So far, many existing methods for color enhancement of displayed images mainly consider the distribution of the frame histogram of the luminance signal (luminance signal), that is, the luminance value (code) of the displayed image corresponds to Quantity diagram. [0003] Please refer to figure 1 , figure 1 A schematic circuit diagram for the existing bar graph extraction to enhance the contrast of the displayed image. exist figure 1 Among them, after the brightness signal (Y) passes through the histogram extraction device 110, the histogram extraction device 110 can calculate the brightness value of the brightness signal (Y), and according to the histogram extraction device 110's histogram The lu...
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IPC IPC(8): H04N9/77
Inventor 李维国吕奕良
Owner MEDIATEK INC