KR20060092447A - Apparatus and method for converting image data into stereoscopic image - Google Patents

Abstract

The present invention relates to an apparatus and method for converting a stereoscopic image of image data, and an object of the present invention is to extract luminance and chroma images from analog or digital image data, and to generate respective histograms from the extracted luminance and chroma images. , Calculating a contrast value for each luminance image and chroma image from the histogram, determining a single image from each luminance and chroma contrast value, calculating stereoscopic parallax from the determined image, A process of generating a stereoscopic image of a right image, a process of filling empty pixels generated in the generated left and right stereoscopic images with surrounding pixel colors, and converting the stereoscopic images of the filled left and right images into analog image signals and outputting them It features.

Image, Image, Luminance, Saturation, Stereoscopic Image, Conversion, Histogram, Contrast, Stereoscopic Parallax

Description

3D image conversion device and method of image data {APPARATUS AND METHOD FOR CONVERTING IMAGE DATA INTO STEREOSCOPIC IMAGE}

1 is a schematic block diagram of a three-dimensional image conversion apparatus for image data according to an embodiment of the present invention;

2 is a flowchart of a stereoscopic image conversion process of image data according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

101: luminance image unit 102: chroma image unit

111: luminance histogram generation unit 112: chroma histogram unit

121: luminance image contrast value calculation unit 122: chroma image contrast value calculation unit

130: image determination unit 140: stereoscopic parallax calculation unit

150: stereoscopic image generation unit 160: stereoscopic image post-processing unit

171, 172: first and second conversion unit

The present invention relates to a three-dimensional image conversion apparatus and method of the image data, and more specifically, to extract the three-dimensional depth information using the luminosity image and chroma image from the analog or digital image and to convert the image data to the three-dimensional image output A stereoscopic image conversion device and method are disclosed.

Conventional stereoscopic conversion methods include a method of producing a stereoscopic image by simply moving the image to the left and right, and displaying the stereoscopic image by extracting a perspective value using RGB color values.

This stereoscopic conversion method has a low stereoscopic effect if the contrast of the color is low.

The present invention has been made to solve the above problems, the object of which is to obtain a brightness image (saturation image) and a saturated image (saturated image) from the image data, and to determine the image with a large contrast (contrast) of the two images To provide a stereoscopic image conversion apparatus and method for converting image data to a stereoscopic image using the determined image,

In accordance with an aspect of the present invention, a three-dimensional image conversion apparatus for image data includes: a luminance image unit for extracting a luminance image from analog or digital image data, and a chroma image unit for extracting a chroma image from the image data; A luminance histogram generator for generating a histogram representing a distribution of luminance values for the luminance image from the luminance image unit, and a chroma histogram generator for generating a histogram representing a distribution of chroma values for the chroma image from the chroma image unit; A luminance / saturation image contrast value calculating unit for calculating a contrast value of the luminance image and the chroma image from the luminance and chroma histogram generating unit, and a large value from two contrast values calculated from the luminance / saturation image contrast calculating unit A luminance / saturation image determination unit for determining one image having a contrast, and the luminance / saturation image texture Stereoscopic disparity calculation unit for calculating stereoscopic disparity value from negatively determined image, and stereoscopic image generation for generating three-dimensional image of RGB (Red, Green, Blue) left image and RGB right image from stereoscopic disparity value obtained by the stereoscopic disparity calculating unit And a stereoscopic image post-processing unit for filling an empty color in the stereoscopic image generated by the stereoscopic image generating unit with an appropriate color, and converting the stereoscopic image filled through the stereoscopic image post-processing unit into left and right analog image signals. Characterized in that the first and second conversion unit.

To achieve the object of the present invention, a stereoscopic image conversion process of image data includes a first process of extracting luminance and chroma images from analog or digital image data, and a histogram of the luminance and chroma images extracted in the first process. A second process of generating, a third process of calculating a contrast value for each luminosity image and a saturation image from each of the generated histograms, a fourth process of determining one image from the luminosity and saturation contrast values, and A fifth process of calculating stereoscopic parallax from the determined image, a sixth process of generating a stereoscopic image of a left image and a right image from the stereoscopic disparity value, and peripheral pixel colors of empty pixels generated in the generated left and right stereoscopic images A seventh process of filling the image into a second image and converting the three-dimensional image of the filled left and right images into an analog image signal and outputting the analog image signal; It is characterized by consisting of eight processes.

The stereoscopic image converting apparatus of the image data according to the preferred embodiment of the present invention, as shown in FIG. 1, includes a light intensity image unit 101 for extracting a light intensity image from analog or digital image data, and the image data. A chroma image unit 102 for extracting a chroma image, a luminance histogram generator 111 for generating a histogram representing a distribution of luminance values for the luminance image from the luminance image unit 101, and the chroma image unit 102. From the chroma histogram generator 112 for generating a histogram representing the chroma value distribution for the chroma image, and the luminance and chroma histogram generators 111 and 112, the contrast values of the chroma and chroma images are obtained. It has a large contrast from the two contrast values calculated from the calculated brightness / saturation image contrast value calculator 121 and 122 and the brightness / saturation image contrast value calculator 121 and 122 A luminance / saturation image determination unit 130 for determining one image, a stereoscopic parallax calculation unit 140 for calculating a stereoscopic parallax value from the image determined by the luminance / saturation image determination unit 130, and the stereoscopic parallax calculation A stereoscopic image generation unit 150 for generating a stereoscopic image of an RGB left image and an RGB right image from the stereoscopic parallax value obtained by the unit 140, and an empty pixel in the stereoscopic image generated by the stereoscopic image generation unit 150. 3D image post-processing unit 160 to fill the appropriate color with respect to the first, and the first and second conversion unit 171 (172) for converting the stereoscopic image filled through the stereoscopic image post-processing unit 160 to the left and right analog image signals It consists of.

Another operation of the embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an apparatus for converting a stereoscopic image of image data according to an exemplary embodiment of the present invention. As shown in FIG. 1, analog or digital image data is obtained through a luminance image unit 101 and a chroma image unit 102. FIG. Image and chroma image are extracted respectively.

The luminance and chroma histogram generators 111 and 112 generate a histogram of the luminance image and a histogram of the chroma image from the image data extracted by the luminance image unit 101 and the chroma image unit 102.

The luminance and saturation image contrast calculators 121 and 122 calculate a contrast value after obtaining a minimum pixel value and a maximum pixel value from the luminance and saturation histograms. The contrast value is calculated from the histogram of the luminance image histogram and the chroma image, respectively.

The luminance and chroma image determination unit 130 determines an image having a larger value among the contrast values of the chroma and luminance images calculated by the luminance and chroma image contrast calculators 121 and 122. That is, a luminance image is selected when the luminance contrast value is greater than the chroma contrast value, and a chroma image is selected when the chroma contrast value is greater than the luminance contrast value.

The stereoscopic parallax calculator 140 calculates an average value of each 8 × 8 block in the determined image. The average values of all the obtained blocks are converted into parallax values.

The stereoscopic image generation unit 150 uses the current image for the RGB left image, and horizontally moves the block according to the corresponding parallax value for the RGB right image.

The stereoscopic image post-processing unit 150 serves to fill an appropriate color when empty pixels are generated in the right image generated by the stereoscopic image generating unit 140 described above. As the horizontal shift is used when generating the stereoscopic image, an uncovered region, which is not filled pixels, may occur. These areas are filled with the surrounding pixels.

The first and second converters 160 and 170 convert the analog stereoscopic image signal to display the digital stereoscopic image generated by the stereoscopic image post-processing unit 150. In this case, the converted analog stereoscopic image signal is composed of a right image signal and a left image signal and is transmitted to the 3D viewer.

2 is a flowchart of a three-dimensional image conversion process of the image data according to an embodiment of the present invention, as shown in the first, the luminance and chroma image from the analog image data or digital image data through the luminance and chroma image unit 101 Extract each of them. (S102)

That is, the luminance image unit 101 generates a luminance image from the current image, and the chroma image unit 102 generates a chroma image from the current image.

The luminance and saturation image histogram generators 111 and 112 are luminance and saturation histograms representing respective luminance and saturation distribution values in the luminance and saturation images extracted through the luminance and saturation image units 101 and 102. (S104)

Contrast values of the luminosity and saturation images are calculated from the luminosity and saturation histograms through the luminance and saturation image contrast calculation units 121 and 122, respectively (S106).

Here, in order to remove the noise of the luminance and chroma histograms for calculating the luminance and chroma image contrast values, a predetermined (a%) number of pixels is deleted on both sides of the histogram, and the smallest and largest values in the luminance histogram are obtained. A luminance contrast value ranging from the luminance image contrast value calculation unit 121 is calculated. In addition, a chroma contrast value, which is a range between the smallest value and the largest value of the chroma value in the chroma histogram, is calculated through the chroma image contrast value calculator 122.

The calculated luminance image and chroma image contrast values are compared, and an image having a large contrast value is selected by the image determination unit 130 (S108).

That is, a luminance image is selected when the luminance contrast value is greater than the chroma contrast value, and a chroma image is selected when the chroma contrast value is greater than the luminance contrast value.

When the image is determined, stereoscopic parallax is calculated from the image through the stereoscopic disparity calculating unit 140. For this purpose, first, the determined image is divided into 8x8 blocks, and then the average value of each block is proportionally converted into a parallax value. (S110)

The right image is generated through the stereoscopic image generator 150 by horizontally moving the corresponding block of the RGB image to the right according to the converted parallax value (S112). It is synthesized to generate the right image.

In this case, the empty pixels generated by the horizontal movement in the right image are filled with the surrounding pixel colors through the stereoscopic image post-processing unit 160 (S114).

The stereoscopic images of the left and right images thus filled are converted into left and right analog video signals through the first and second converters 171 and 172, respectively, and output.

Although a preferred embodiment according to the present invention has been described above, a technique of converting a stereoscopic image using a luminosity image and a saturation image may be variously modified, and those skilled in the art may have patents of the present invention. It is understood that various modifications and variations can be made without departing from the scope of the claims.

As described above, the present invention has the effect of obtaining a stereoscopic image from an image.

In addition, the present invention has an effect of improving stereoscopic effect by using an image having a large contrast value by using a saturation image rather than a stereoscopic conversion method using only a luminescence image. There is a disadvantage that the three-dimensional effect is low. In addition, the present invention is capable of three-dimensional conversion of the image regardless of the format of the image, there is a lot of still images in the motion picture, such as a movie, while being applied to a still picture, it is obvious that it is also applicable to the three-dimensional image of the still image.

In addition, when the present invention is applied to a medical imaging system, the diagnosis and treatment of the medical image by reading it as a stereoscopic image (for example, 3D X-rays such as x-ray, video endoscope, digital engineering, etc.) There is an effect that can improve the efficiency of. In addition, it can be applied to stereo conversion of many still scenes in movies produced by 'MPEG-1' video, 'MPEG-2' DVD (DVD), and 'H.264' compression codec.

Claims (9)

A luminance image unit which extracts a luminance image from analog or digital image data; A chroma image unit for extracting chroma images from the image data; A luminance histogram generator for generating a histogram representing a distribution of luminance values of the luminance images from the luminance image unit; A chroma histogram generator for generating a histogram representing a chroma value distribution of the chroma image from the chroma image unit; A luminance / saturation image contrast value calculating unit for calculating a contrast value of the luminance image and the chroma image from the luminance and chroma histogram generator; A luminance / saturation image determination unit for comparing one of the two contrast values calculated from the luminance / saturation image contrast value calculator to determine one image having a large contrast; A stereoscopic parallax calculation unit that calculates a stereoscopic parallax value from the image determined by the luminance / saturation image determination unit; A stereoscopic image generator for generating a stereoscopic image of an RGB (red, green, blue) left image and an RGB right image from the stereoscopic parallax value obtained by the stereoscopic parallax computation unit; A stereoscopic image post-processing unit for filling the empty pixels in the stereoscopic images generated by the stereoscopic image generator with an appropriate color; And a first and second converters for converting and outputting the stereoscopic image filled through the stereoscopic image post-processing unit into left and right analog image signals. The method of claim 1, And the stereoscopic parallax calculation unit calculates an average value of each '8x8' block in the image determined by the luminance / saturation image determination unit, and converts the average values of the respective blocks into parallax values. The method of claim 1, And the stereoscopic image generating unit uses the current image with respect to the RGB left image and horizontally moves a block according to the parallax value with respect to the RGB right image. The method of claim 1, And the stereoscopic image post-processing unit fills empty pixels generated in the right image generated by horizontal movement in the stereoscopic image generating unit with the same color pixels as the surrounding pixels. A first process of extracting luminance and chroma images from analog or digital image data; A second step of generating respective histograms from the light intensity and chroma images extracted in the first step; A third process of calculating contrast values for each of the luminosity and saturation images from each of the generated histograms; A fourth process of determining one image from the luminosity and saturation contrast values; A fifth process of calculating stereoscopic parallax from the determined image; A sixth process of generating a stereoscopic image of a left image and a right image from the stereoscopic parallax value; A seventh process of filling empty pixels generated in the generated left and right stereoscopic images with peripheral pixel colors; And And an eighth process of converting the three-dimensional images of the filled left and right images into analog video signals and outputting the converted three-dimensional images. The method of claim 5, wherein The third process includes deleting a predetermined (a%) number of pixels on both sides of the generated histogram; Calculating a luminance contrast value in the luminance histogram which is a range between a smallest value and a large magnetic field value; And And calculating a saturation contrast value in the saturation histogram that is a range of the smallest and largest values of the saturation value. The method of claim 5, wherein The fourth process includes selecting a luminance image when the calculated luminance contrast value is greater than the chroma contrast value; And And selecting a chroma image if the chroma contrast value is greater than the luminance contrast value. The method of claim 5, wherein The fifth process may include dividing an image determined through the fourth process into 8x8 blocks; Calculating an average value of each block; Converting the average brightness values of all the calculated blocks proportionally to parallax values; And And generating a right image by moving a corresponding block of the RGB image to the right according to the parallax value. 3. The method of claim 5, wherein In the sixth step, the right image is a three-dimensional image conversion method of the image data, characterized in that the left image comprises the synthesis of the blocks moved horizontally to the right.

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