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Visual processing device, visual processing method, visual processing program, and semiconductor device

A technology of visual processing and grayscale processing, applied in image data processing, image enhancement, instruments, etc., can solve the problems of large shade changes, large image areas, and it is difficult to prevent false contours, so as to reduce storage capacity and suppress false contours Effect

Active Publication Date: 2006-10-18
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since gradation processing is performed using one gradation transformation curve Cm for each image region Sm, the joints at the boundaries of the respective image regions Sm may not be sufficiently natural and conspicuous, and false contours may be generated in the image region Sm.
In addition, the number of divisions is 4 to 16 at best, but the image area Sm is large, so when there are extremely different images between the image areas, the shading changes between the image areas are large, and it is difficult to prevent the occurrence of false contours.

Method used

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  • Visual processing device, visual processing method, visual processing program, and semiconductor device
  • Visual processing device, visual processing method, visual processing program, and semiconductor device
  • Visual processing device, visual processing method, visual processing program, and semiconductor device

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no. 1 Embodiment approach

[0106] control Figure 1 to Figure 5 , the visual processing device 1 as the first embodiment of the present invention will be described. The visual processing device 1 is, for example, built in or connected to an image processing device such as a computer, a television, a digital camera, a mobile phone, or a PDA, and performs grayscale processing of an image. The visual processing device 1 is characterized in that it performs gradation processing on each of image regions that are divided more finely than conventionally.

[0107]

[0108] figure 1 It is a block diagram illustrating the configuration of the visual processing device 1 . The visual processing device 1 includes: an image dividing unit 2 for dividing an original image input as an input signal IS into a plurality of image regions Pm (1≤m≤n: n is the number of divisions of the original image), and derives A gradation transformation curve derivation unit 10 for the gradation transformation curve Cm, and a gradat...

no. 2 Embodiment approach

[0133] control Figure 6 ~ Figure 18 , the visual processing device 11 as the second embodiment of the present invention will be described. The visual processing device 11 is, for example, built in or connected to an image processing device such as a computer, a television, a digital camera, a mobile phone, or a PDA, and performs image grayscale processing. The visual processing device 11 is characterized in that it switches and uses a plurality of gradation transformation curves stored in advance as LUTs.

[0134]

[0135] Figure 6 A block diagram illustrating the structure of the visual processing device 11 is shown. The visual processing device 11 has an image division unit 12 , a selection signal derivation unit 13 , and a gradation processing unit 20 . The image dividing unit 12 receives an input signal IS, and outputs a plurality of image regions Pm obtained by dividing the original image input as the input signal IS (1≤m≤n: n is the number of divisions of the orig...

no. 3 Embodiment approach

[0261] control Figure 19 ~ Figure 21 , the visual processing device 21 as the third embodiment of the present invention will be described. The visual processing device 21 is, for example, a device that is built in or connected to an image processing device such as a computer, a television, a digital camera, a mobile phone, or a PDA, and performs grayscale processing of an image. The visual processing device 21 is characterized in that it switches and uses a plurality of gradation transformation curves stored in advance as an LUT for each pixel to be subjected to gradation processing.

[0262]

[0263] Figure 19 It is a block diagram illustrating the configuration of the visual processing device 21 . The visual processing device 21 has an image division unit 22 , a selection signal derivation unit 23 , and a gradation processing unit 30 . The image dividing unit 22 receives the input signal IS and outputs a plurality of image regions Pm obtained by dividing the original ...

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Abstract

The invention provides a visual processing device capable of realizing grayscale processing that further improves visual effects. A visual processing device (1) performs gradation processing on an input signal (IS) for each image region, and includes an image segmentation unit (2), a gradation transformation curve derivation unit (10), and a gradation processing unit (5). The image segmentation unit (2) and the grayscale transformation curve derivation unit (10) generate the grayscale transformation curve (Cm) of the image region (Pm) using the brightness histogram (Hm) of the wide area image region (Em). A gradation processing unit (5) performs gradation processing of the image region (Pm) based on the derived gradation transformation curve (Cm).

Description

technical field [0001] The invention relates to a visual processing device, in particular to a visual processing device for grayscale processing of image signals. In addition, the present invention also relates to a visual processing method, a visual processing program, and a semiconductor device. Background technique [0002] As visual processing of an image signal of an original image, spatial processing and gradation processing are known. [0003] Spatial processing refers to performing processing on a target pixel by using surrounding pixels of the target pixel to be processed. In addition, techniques for performing contrast enhancement of an original image, dynamic range (DR) compression, and the like using an image signal subjected to spatial processing are also known. In contrast enhancement, the difference between the original image and the blurred signal (the sharp component of the image) is added to the original image to sharpen the image. In DR compression, a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N1/40
Inventor 山下春生渡边辰巳物部祐亮井东武志小岛章夫桑原康浩黑泽俊晴
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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