JP2005130238A - Image processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processor which prevents pixel data in the same color as key color data from turning into noise. <P>SOLUTION: The image processor is provided with; a comparison part 2 which activates a coincidence signal in the case of coincidence between front image data and key color data; a bit inversion processing part 3 which subjects pixel data to bit inversion operation to output it, when the coincidence signal is activated; a frame memory 5, wherein front image data and a rear image data are stored; a smearing-away processing part 4 which writes key color data in a prescribed part of front image data; and a chroma key processing part 14, which outputs pixel data, as it is, in when there is no match between pixel data in front image data and key color data and outputs corresponding pixel data in rear image data, when there is matching. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image processing apparatus for synthesizing two images represented by first and second image data supplied from the outside and outputting synthesized image data representing the synthesized image.

  Conventionally, an image processing apparatus is used for synthesizing two images represented by first input image data and second input image data, and outputting synthesized image data representing the synthesized image. . Such a conventional image processing apparatus will be described with reference to FIG. FIG. 16 is a diagram showing an outline of a conventional image processing apparatus 31. The image processing device 31 converts pixel data having the same color as a predetermined color (key color) in the front image data as the first input image data into the back image data as the second input image data. It is an apparatus for generating and outputting composite image data by replacing with pixel data of corresponding coordinates.

  As illustrated in FIG. 16, the image processing apparatus 31 includes a fill processing unit 32, a frame memory 33, first and second color conversion processing units 36 and 39, and a chroma key processing unit 42. The first color conversion processing unit 36 includes a first lookup table storage unit 37 and a first conversion processing unit 38, and the second color conversion processing unit 39 includes a second lookup table storage unit 40, 2 conversion processing unit 41.

The frame memory 33 has a front image data storage area 34 for storing front image data and a back image data storage area 35 for storing back image data.
In the front image data storage area 34, front image data supplied from the outside is stored. FIG. 17 is a diagram illustrating an example of an image represented by the front image data stored in the front image data storage area 34. As shown in FIG. 17, in a natural image such as a landscape, there may be a pixel having the same color as the key color.

  Referring to FIG. 16 again, the fill processing unit 32 instructs to replace part of the pixel data in the front image data with data representing the key color (key color data) (filling with the key color). Is supplied from the outside. The fill processing unit 32 replaces some pixel data in the front image data in the front image data storage area 34 with the key color data in accordance with the instruction data. FIG. 18 is a diagram illustrating an image represented by front image data after partial pixel data is replaced with key color data.

  Referring to FIG. 16 again, the back image data supplied from the outside is stored in the back image data storage area 35. FIG. 19 is a diagram illustrating an example of an image represented by the back image data stored in the back image data storage area 35.

  Referring to FIG. 16 again, the first and second look-up table storage units 37 and 40 store first and second look-up tables that are tables for performing color conversion on the front image data and the back image data, respectively. To do. The first and second lookup tables are tables in which input values (pixel data) are associated with output values (pixel data). The first and second look-up tables are created so as not to change the color of the pixel data having the same color as the key color in the front image data and the rear image data (convert to the same color (key color)). Yes.

  The first conversion processing unit 38 sequentially performs color conversion processing on the pixel data in the front image data using the first look-up table, and sequentially supplies it to the chroma key processing unit 42. Similarly, the second conversion processing unit 41 sequentially performs color conversion processing on the pixel data in the back image data using the second look-up table, and sequentially supplies it to the chroma key processing unit 42.

  The chroma key processing unit 42 sequentially compares the pixel data in the front image data after the color conversion processing with the key color data, and outputs the data as it is when the pixel data in the front image data does not match the key color data. If the pixel data in the front image data matches the key color data, the coordinates in the back image data corresponding to the coordinates in the front image data of the pixel data in the front image data that matches the key color data are set. The pixel data located is output. FIG. 20 is a diagram illustrating an image represented by output image data output from the chroma key processing unit 42.

  As described above, in the image processing device 31, when pixel data having the same color as the key color data is present in the front image data (see FIG. 17), these pixel data are pixels at corresponding positions in the rear image data. It was replaced with data (see FIG. 20), resulting in noise.

  By the way, two sets of frame memories A and B for storing images, display address generating means for generating display addresses for reading out images stored in the frame memories A and B, and frame memories A and B, A display for displaying the stored image, a chroma key color designating unit for designating a color for performing chroma key from the outside, and a color comparison unit for comparing whether or not the input image and the color designated by the chroma key color designating unit match. A chroma key display device comprising display image switching means for displaying the image read from the frame memory A on the display when the comparison results of the color comparison means match, and displaying the image read from the frame memory B on the display when they do not match. In addition, a specific color designated from the outside among the image colors input to the color comparison means is clicked. Comprising the image color converting means for converting the McKee color is known chromakey display device characterized by capable of chromakey display a plurality of colors specified by using the image color converting unit (e.g., see Patent Document 1).

  However, the chroma key display device disclosed in Patent Document 1 enables display of a chroma key in a plurality of colors. However, when pixel data having the same color as the key color is present in the front image data, noise is displayed. It does not prevent the occurrence.

JP-A-5-336537

  In view of the above, the present invention provides an image processing apparatus capable of preventing noise from occurring when pixel data having the same color as key color data is present in front image data. For the purpose.

  In order to solve the above problems, an image processing apparatus according to a first aspect of the present invention combines two images represented by first and second image data supplied from the outside, and combines them. An apparatus for outputting composite image data representing an image, wherein a plurality of pixel data in the first image data are sequentially compared with data representing a predetermined color, and a control signal is activated when they match. 1 and when the control signal is activated, the pixel data in the first image data is subjected to a predetermined calculation and output. When the control signal is not activated, the first image is output. A second means for outputting pixel data in the data without performing a predetermined calculation, and a memory having first and second areas, and is constituted by a plurality of pixel data output by the second means Storing the third image data in the first area; A memory for storing the second image data in the second area; a third means for writing data representing a predetermined color in a predetermined part of the first area of the memory in response to an instruction from the outside; A plurality of pixel data in the image data are sequentially compared with data representing a predetermined color, and if they do not match, the pixel data in the third image data is output as the pixel data constituting the composite image data and matches In this case, the pixel data located at the coordinates in the second image data corresponding to the coordinates in the third image data of the pixel data in the third image data that matches the data representing the predetermined color is combined image data. And a fourth means for outputting as pixel data constituting the.

  Here, the pixel data constituting the first image data includes an R (red) component, a G (green) component, and a B (blue) component, and the predetermined calculation is performed using the R component, the G component, And it is good also as a calculation which inverts LSB (Least Significant Bit) of the component with the largest number of gradations among B components, or LSB of B component.

  Further, the pixel data constituting the first image data includes a Y (luminance) component and a U (difference between luminance and red) / V (difference between luminance and blue) components. It may be an operation that inverts the LSB of the U / V component.

  Furthermore, a fifth means for generating fourth image data by applying a predetermined first color conversion process to the third image data, and a predetermined second color conversion process to the second image data And a sixth means for generating fifth image data, wherein the fourth means sequentially compares the plurality of pixel data in the fourth image data with data representing a predetermined color, and matches them. If not, the pixel data in the fourth image data is output as the pixel data constituting the composite image data. If they match, the pixel data in the fourth image data that matches the data representing the predetermined color is output. The pixel data located at the coordinates in the fifth image data corresponding to the coordinates in the fourth image data may be output as the pixel data constituting the composite image data.

  In addition, the image processing apparatus according to the second aspect of the present invention combines two images represented by first and second image data supplied from the outside, and combines image data representing the combined image. A first means for sequentially comparing a plurality of pixel data in the first image data with data representing a predetermined color and activating the first control signal if they coincide with each other When the first control signal is activated, the pixel data in the first image data is subjected to a predetermined first calculation and is output, and the pixel data in the first image data is output to the pixel data in the first image data. Data indicating that the first calculation has been performed is output as calculation execution information data, and when the first control signal is not activated, the first calculation is not performed on the pixel data in the first image data. And the pixels in the first image data A second means for outputting data indicating that the first calculation is not performed on the data as calculation execution information data, and a memory having first to third areas, and the second means outputs Third image data composed of a plurality of pixel data is stored in the first area, a plurality of calculation execution information data is stored in the second area, and the second image data is stored in the third area. A memory, a third means for writing data representing a predetermined color in a predetermined portion of the first area of the memory in response to an instruction from the outside, a plurality of pixel data in the third image data, and a plurality of When the calculation execution information data is sequentially read and the calculation execution information data indicates that the first calculation is not performed, the pixel data in the third image data is output as the pixel data constituting the fourth image data. , Calculation execution information data When the first calculation is performed, the pixel data obtained by performing the second calculation on the pixel data in the third image data is output as the pixel data constituting the fourth image data. A fifth means for sequentially comparing a plurality of pixel data in the third image data with data representing a predetermined color and activating a second control signal if they match, a second control When the signal is not activated, the pixel data in the fourth image data is output as the pixel data constituting the composite image data, and when the second control signal is activated, the predetermined color is displayed. The pixel data located at the coordinates in the second image data corresponding to the coordinates in the fourth image data of the pixel data in the fourth image data that matches the data to be represented is output as the pixel data constituting the composite image data 6th hand to do A stage.

Here, the first and second operations may be operations that invert predetermined bits in the pixel data.
In addition, a seventh means for generating fifth image data by applying a predetermined first color conversion process to the fourth image data, and a predetermined second color conversion process to the second image data And an eighth means for generating sixth image data, wherein the seventh means converts the pixel data in the fifth image data when the second control signal is not activated. The fifth image data of the pixel data in the fifth image data that is output as the pixel data constituting the composite image data and matches the data representing the predetermined color when the second control signal is activated The pixel data located at the coordinates in the sixth image data corresponding to the coordinates in the image may be output as the pixel data constituting the composite image data.
Further, ninth means for delaying the second control signal by a predetermined time may be further provided.

  According to the present invention, it is possible to prevent noise from occurring when pixel data having the same color as the key color data exists in the front image data.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same component, it has shown with the same reference number.

FIG. 1 is a diagram showing an overview of an image processing apparatus according to the first embodiment of the present invention. The image processing apparatus 1 uses pixel data of the same color as a predetermined color (key color) in the front image data as the first input image data in the rear image data as the second input image data. It is an apparatus for generating and outputting composite image data by replacing with pixel data of corresponding coordinates.
In this embodiment, the pixel data in the front image data and the back image data, and the key color data are R (red) component 5 bits, G (green) component 6 bits, and B (blue) component 5 bits. Each pixel data in the output image data has a total width of 24 bits of 8 bits for R (red) component, 8 bits for G (green) component, and 8 bits for B (blue) component. Shall.

  As shown in FIG. 1, the image processing apparatus 1 includes a comparison unit 2, a bit inversion processing unit 3, a fill processing unit 4, a frame memory 5, and first and second color conversion processing units 8 and 11. And a chroma key processing unit 14. The first color conversion processing unit 8 includes a first lookup table storage unit 9 and a first conversion processing unit 10, and the second color conversion processing unit 11 includes a second lookup table storage unit 12, 2 conversion processing unit 13.

The comparison unit 2 and the bit inversion processing unit 3 are sequentially supplied with pixel data constituting the front image data from the outside. FIG. 2 is a diagram illustrating an example of an image represented by front image data supplied from the outside. Here, as shown in FIG. 2, it is assumed that pixels having the same color as the key color exist in the image represented by the front image data.
Referring to FIG. 1 again, the comparison unit 2 compares the pixel data sequentially supplied from the outside with the data representing the key color (key color data), and if the pixel data and the key color data match, The coincidence signal is activated and supplied to the bit inversion processing unit 3.

  When the coincidence signal is activated, the bit inversion processing unit 3 inverts the LSB (Least Significant Bit) in the 6 bits representing the G (green) component in the pixel data supplied from the outside to generate a frame It is stored in the front image data storage area 6 in the memory 5. On the other hand, when the coincidence signal is not activated, the bit inversion processing unit 3 stores the pixel data supplied from the outside in the front image data storage area 6 in the frame memory 5 as it is. FIG. 3 is a diagram illustrating an image represented by front image data after LSB in 6 bits representing G (green) component in pixel data matching the key color data is inverted. The color of the pixel after the LSB in the 6 bits representing the G (green) component is inverted is the original color (the color before the LSB in the 6 bits representing the G (green) component is inverted). ) Will be different. However, the LSB in 6 bits representing the G (green) component in all 16 bits is only inverted and the color change is slight.

  Referring to FIG. 1 again, the paint processing unit 4 is supplied with instruction data from the outside instructing to replace part of the pixel data in the front image data with the key color data (filling with the key color). The fill processing unit 4 replaces some pixel data in the front image data in the front image data storage area 6 with key color data in accordance with the instruction data. FIG. 4 is a diagram illustrating an image represented by front image data after partial pixel data is replaced with key color data.

  Referring to FIG. 1 again, the frame memory 5 has a back image data storage area 7 for storing the back image data in addition to the front image data storage area 6 for storing the front image data. In this rear image data storage area 7, rear image data is supplied from outside and stored. FIG. 5 is a diagram illustrating an example of an image represented by the back image data stored in the back image data storage area 7.

  Referring to FIG. 1 again, the first and second look-up table storage units 9 and 12 store the first and second look-up tables, which are tables for converting the colors of the front image data and the back image data, respectively. Store. The first and second look-up tables are tables in which input values (16-bit width data here) and output values (24-bit width data here) are associated with each other. The first and second look-up tables are created so as not to change the color of the pixel data having the same color as the key color in the front image data and the back image data. That is, in the first and second look-up tables, when the input value is key color data (16-bit width), the data obtained by shifting the key color data to the left bit (24-bit width) is created as the output value. ing.

The first conversion processing unit 10 sequentially performs color conversion processing on the pixel data in the front image data using the first look-up table, and sequentially supplies it to the chroma key processing unit 14. FIG. 6 is a diagram illustrating an image represented by the front image data after the color conversion process is performed. It should be noted that the LSB in the 6 bits representing the G (green) component is inverted, and the color of the pixel subjected to the color conversion processing thereafter is not inverted but the LSB in the 6 bits representing the G (green) component. This is different from the color when color conversion processing is performed. However, the color change due to the inversion of the LSB in 6 bits representing the G (green) component in all 16 bits is slight, and the color change due to the subsequent color conversion processing is also There are few.
Similarly, the second conversion processing unit 13 sequentially performs color conversion processing on the pixel data in the back image data using the second look-up table, and sequentially supplies it to the chroma key processing unit 14.

  The chroma key processing unit 14 sequentially compares the pixel data in the front image data after the color conversion processing with the key color data, and outputs the pixel data as it is when the pixel data does not match the key color data. If the data matches the key color data, the pixel data located at the coordinates in the back image data corresponding to the coordinates in the front image data of the pixel data in the front image data that matches the key color data is output. FIG. 7 is a diagram illustrating an image represented by the output image data output from the chroma key processing unit 14.

  As described above, according to the image processing apparatus 1, when pixel data of the same color as the key color is present in the front image data, such pixel data is at a corresponding position in the rear image data. It can be prevented from being replaced with pixel data, and noise can be suppressed.

In this embodiment, the bit inversion processing unit 3 inverts the LSB of the G (green) component in the pixel data of the same color as the key color, but the R (red) component or B (blue) ) The LSB of the component may be inverted. In the present embodiment, the R (red) component in the pixel data is 5 bits, the G (green) component is 6 bits, the B (blue) component is 5 bits, and the G (green) component having the largest number of gradations. By reversing the LSB, the change in pixel color can be suppressed to a minimum.
Further, the luminance Y of the pixel is calculated using the values of R (red), G (green), and B (blue) components. Y = 0.299R + 0.587G + 0.114B (1)
It can be expressed as In general, it is known that the human eye is more sensitive to changes in luminance than changes in color. In consideration of this, the bit inversion processing unit 3 may invert the LSB of the B (blue) component that has little influence on the luminance (see equation (1)).

In this embodiment, the pixel data in the front image data and the back image data has a total 16-bit width of 5 bits for R (red) component, 6 bits for G (green) component, and 5 bits for B (blue) component. Although it is supposed to be, it may be a total of 24 bits wide (24-bit full color) of 8 bits for R (red) component, 8 bits for G (green) component and 8 bits for B (blue) component. At this time, the bit inversion processing unit 3 may invert the LSB of the B (blue) component that has little influence on the luminance (see equation (1)).
Similarly, when the pixel data in the front image data and the rear image data has a total 3n-bit width of R (red) component n bits, G (green) component n bits, and B (blue) component n bits, bit inversion is performed. The processing unit 3 may invert the LSB of the B (blue) component that has little influence on the luminance (see equation (1)).

  In this embodiment, the pixel data in the front image data and the back image data has a total 16-bit width of 5 bits for R (red) component, 6 bits for G (green) component, and 5 bits for B (blue) component. Although it is supposed to be, it may be 16 bits wide in total, that is, Y (luminance) component 8 bits, U (difference between luminance and red) and V (difference between luminance and blue) components 8 bits. At this time, the bit inversion processing unit 3 may invert LSBs of U (difference between luminance and red) and V (difference between luminance and blue) components. This takes into account that the human eye is more sensitive to changes in brightness than changes in color.

Next, a second embodiment of the present invention will be described. FIG. 8 is a diagram showing an overview of an image processing apparatus according to the second embodiment of the present invention. The image processing apparatus 21 uses pixel data of the same color as the key color in the front image data as the first input image data, and the pixel at the corresponding position in the back image data as the second input image data. It is an apparatus for generating and outputting composite image data by replacing with data.
In this embodiment, the pixel data in the front image data and the back image data, and the key color data are R (red) component 5 bits, G (green) component 6 bits, and B (blue) component 5 bits. Each pixel data in the output image data has a total width of 24 bits of 8 bits for R (red) component, 8 bits for G (green) component, and 8 bits for B (blue) component. Shall.

  As shown in FIG. 8, the image processing apparatus 21 includes comparison units 2 and 28, bit inversion processing units 22 and 27, a fill processing unit 4, a frame memory 23, and first and second color conversion processing units. 8, 11, a delay unit 29, and a synthesis processing unit 30. The first color conversion processing unit 8 includes a first lookup table storage unit 9 and a first conversion processing unit 10, and the second color conversion processing unit 11 includes a second lookup table storage unit 12, 2 conversion processing unit 13.

The comparison unit 2 and the bit inversion processing unit 22 are sequentially supplied with pixel data constituting the front image data from the outside. FIG. 9 is a diagram illustrating an example of an image represented by front image data supplied from the outside. Here, as shown in FIG. 9, it is assumed that pixels having the same color as the key color exist in the image represented by the front image data.
Referring to FIG. 8 again, the comparison unit 2 compares the pixel data sequentially supplied from the outside with the data representing the key color (key color data), and if the pixel data and the key color data match, The coincidence signal is activated and supplied to the bit inversion processing unit 22.

  When the coincidence signal is activated, the bit inversion processing unit 22 inverts the LSB (Least Significant Bit) in the 6 bits representing the G (green) component in the pixel data supplied from the outside to generate a frame Bit-inverted data is stored in the front image data storage area 24 in the memory 23 and 1-bit width data “1” indicating that the LSB in 6 bits representing the G (green) component in the pixel data is inverted. Is stored in the bit inversion data storage area 25. On the other hand, when the coincidence signal is not activated, the bit inversion processing unit 22 stores the pixel data supplied from the outside as it is in the front image data storage area 24 in the frame memory 23 and also stores the G data in the pixel data. Data “0” having a 1-bit width indicating that the LSB in the 6 bits representing the (green) component is not inverted is stored in the bit-inversion data storage area 25 as bit-inversion data. FIG. 10 is a diagram showing an image represented by the front image data after the LSB in 6 bits representing the G (green) component in the pixel data matching the key color data is inverted.

  Referring to FIG. 8 again, the paint processing unit 4 is supplied with instruction data from the outside instructing to replace a part of the pixel data in the front image data with the key color data (filling with the key color). The fill processing unit 4 replaces some pixel data in the front image data in the front image data storage area 24 with the key color data in accordance with the instruction data. FIG. 11 is a diagram illustrating an image represented by front image data after partial pixel data is replaced with key color data.

  Referring to FIG. 8 again, the frame memory 23 inverts the LSB in the 6-bit representing the G (green) component in the front image data storage area 24 for storing the front image data and the pixel data in the front image data. In addition to the bit-reversed data storage area 25 for storing data indicating whether or not it has been performed, it also has a back image data storage area 26 for storing back image data. The rear image data is supplied from the outside and stored. FIG. 12 is a diagram illustrating an example of an image represented by the back image data stored in the back image data storage area 26.

  Referring to FIG. 8 again, the bit inversion processing unit 27 sequentially refers to the bit inversion data stored in the bit inversion data storage area 25 and the pixel data stored in the front image data storage area 24, and the bit inversion data Is “1”, the LSB in 6 bits representing the G (green) component in the pixel data is inverted and supplied to the first color conversion processing unit 8. On the other hand, when the bit inversion data is “0”, the bit inversion processing unit 27 supplies the pixel data to the first color conversion processing unit 8 as it is. FIG. 13 is a diagram illustrating an image represented by image data including pixel data that the bit inversion processing unit 27 sequentially supplies to the first color conversion processing unit 8.

Referring to FIG. 8 again, the first conversion processing unit 10 sequentially performs color conversion processing on the pixel data in the front image data using the first look-up table, and sequentially supplies it to the synthesis processing unit 30. FIG. 14 is a diagram illustrating an image represented by the front image data after the color conversion process is performed.
Referring again to FIG. 8, similarly, the second conversion processing unit 13 sequentially performs color conversion processing on the pixel data in the back image data using the second look-up table, and sequentially supplies it to the synthesis processing unit 30. .

  The comparison unit 28 sequentially reads pixel data in the front image data (see FIG. 11) stored in the front image data storage area 24 and compares it with key color data. When the pixel data and the key color data match, the match signal is activated and supplied to the delay unit 29. The delay unit 29 delays the coincidence signal by a predetermined time (here, the time necessary for the color conversion processing of the first and second color conversion processing units 8 and 11) and supplies the delayed signal to the synthesis processing unit 30.

  The composition processing unit 30 outputs the pixel data supplied from the first color conversion processing unit 8 to the outside when the coincidence signal is not activated, and performs the second color conversion process when the coincidence signal is activated. The pixel data supplied from the unit 11 is output to the outside. FIG. 15 is a diagram illustrating an image represented by output image data output from the synthesis processing unit 30.

As described above, according to the image processing device 21, when pixel data having the same color as the key color is present in the front image data, such pixel data is at the corresponding position in the rear image data. It can be prevented from being replaced with pixel data, and noise can be suppressed.
Further, in the image processing apparatus 1 described above, when pixel data having the same color as the key color exists in the front image data, the LSB of the G (green) component of such pixel data is inverted, It will be different from the original color. However, according to the image processing device 21, the LSB of the G (green) component inverted by the bit inversion processing unit 22 is inverted again by the bit inversion processing unit 27 and returns to the original value. Can be prevented.

  The present invention can be used in an image processing apparatus for synthesizing two images represented by first input image data and second input image data and generating synthesized image data representing the synthesized image. is there. Furthermore, the present invention provides a visual phone that displays natural images as first and second input image data, combines two images represented by these input image data, and displays the combined image. Etc. are available.

1 is a diagram showing an overview of an image processing apparatus as a first embodiment of the present invention. An example of an image represented by front image data supplied to the image processing apparatus 1. An example of an image represented by image data output from the bit inversion processing unit 3. An example of an image after pixel data is replaced by the paint processing unit 4. An example of an image represented by back image data supplied to the image processing apparatus 1. An example of an image represented by image data output from the first color conversion processing unit 8. An example of an image represented by image data output from the chroma key processing unit 14. The figure which shows the outline | summary of the image processing apparatus as the 2nd Embodiment of this invention. An example of an image represented by front image data supplied to the image processing apparatus 1. An example of an image represented by image data output from the bit inversion processing unit 22. An example of an image after pixel data is replaced by the paint processing unit 4. An image represented by back image data supplied to the image processing device 21. An example of an image represented by image data output from the first color conversion processing unit 8. An example of an image represented by image data output from the bit inversion processing unit 27. An example of an image represented by image data output by the synthesis processing unit 30. The figure which shows the outline | summary of the conventional image processing apparatus. An image represented by front image data supplied to the image processing device 31. An image after pixel data is replaced by the fill processing unit 32. An image represented by back image data supplied to the image processing device 31. An example of an image represented by image data output from the chroma key processing unit.

Explanation of symbols

  1, 21, 31 Image processing device, 2, 28 Comparison unit, 3, 22, 27 Bit inversion processing unit, 4, 32 Fill processing unit, 5, 23, 33 Frame memory, 8, 36 First color conversion processing unit, 9, 37 First lookup table storage unit, 10, 38 First conversion processing unit, 11, 39 Second color conversion processing unit, 12, 40 Second lookup table storage unit, 13, 41 Second conversion processing unit, 14, 42 Chroma key processing unit, 29 delay unit, 30 synthesis processing unit

Claims (8)

An apparatus for synthesizing two images represented by first and second image data supplied from the outside and outputting synthesized image data representing the synthesized image,
A first means for sequentially comparing a plurality of pixel data in the first image data with data representing a predetermined color and activating a control signal if they match;
When the control signal is activated, the pixel data in the first image data is subjected to a predetermined calculation and output. When the control signal is not activated, the first image data Second means for outputting the pixel data without performing the predetermined calculation;
A memory having a first area and a second area, wherein third image data constituted by a plurality of pixel data output from the second means is stored in the first area, and the second image The memory for storing data in the second area;
Third means for writing data representing the predetermined color in a predetermined portion of the first area of the memory in response to an instruction from the outside;
A plurality of pixel data in the third image data are sequentially compared with data representing the predetermined color, and when they do not match, the pixel data in the third image data is converted into pixel data constituting the composite image data In the second image data corresponding to the coordinates in the third image data of the pixel data in the third image data that matches the data representing the predetermined color. A fourth means for outputting pixel data located at coordinates as pixel data constituting the composite image data;
An image processing apparatus comprising: Pixel data constituting the first image data includes an R (red) component, a G (green) component, and a B (blue) component, and the predetermined calculation includes the R component, the G component, The image processing apparatus according to claim 1, wherein the image processing apparatus is an operation that inverts an LSB (Least Significant Bit) of a component having the largest number of gradations of B components or an LSB of the B component. The pixel data constituting the first image data includes a Y (luminance) component and a U (difference between luminance and red) / V (difference between luminance and blue) components, and the predetermined calculation is performed as follows: The image processing apparatus according to claim 1, wherein the image processing apparatus is an operation that inverts the LSB of the U / V component. Fifth means for generating fourth image data by applying a predetermined first color conversion process to the third image data; and applying a predetermined second color conversion process to the second image data And a sixth means for generating fifth image data.
The fourth means sequentially compares a plurality of pixel data in the fourth image data with data representing the predetermined color, and if they do not match, the pixel data in the fourth image data is combined with the combined data. When the pixel data is output as pixel data constituting the image data and matches, the pixel data in the fourth image data that matches the data representing the predetermined color corresponds to the coordinates in the fourth image data. The image processing apparatus according to claim 1, wherein pixel data located at coordinates in the fifth image data is output as pixel data constituting the composite image data. An apparatus for synthesizing two images represented by first and second image data supplied from the outside and outputting synthesized image data representing the synthesized image,
A first means for sequentially comparing a plurality of pixel data in the first image data with data representing a predetermined color and activating a first control signal if they match,
When the first control signal is activated, the pixel data in the first image data is subjected to a predetermined first calculation and output, and the pixel data in the first image data is output. Data indicating that the first calculation has been performed is output as calculation execution information data, and when the first control signal is not activated, the pixel data in the first image data is included in the first data. Second means for outputting the data indicating that the first calculation is not performed on the pixel data in the first image data as the calculation execution information data.
A memory having first to third areas, wherein third image data constituted by a plurality of pixel data output from the second means is stored in the first area, and the plurality of operations are performed. The memory storing information data in the second area and storing the second image data in the third area;
Third means for writing data representing the predetermined color in a predetermined portion of the first area of the memory in response to an instruction from the outside;
When the plurality of pieces of pixel data and the plurality of calculation execution information data in the third image data are sequentially read and the calculation execution information data indicates that the first calculation is not performed, the third image is displayed. Pixel data in the third image data is output when pixel data in the data is output as pixel data constituting the fourth image data, and the calculation execution information data indicates that the first calculation has been performed. A fourth means for outputting the pixel data obtained by performing the second operation to the pixel data constituting the fourth image data;
Fifth means for sequentially comparing a plurality of pixel data in the third image data with data representing the predetermined color and activating a second control signal if they match,
When the second control signal is not activated, the pixel data in the fourth image data is output as pixel data constituting the composite image data, and the second control signal is activated. A pixel located at the coordinates in the second image data corresponding to the coordinates in the fourth image data of the pixel data in the fourth image data that matches the data representing the predetermined color Sixth means for outputting data as pixel data constituting the composite image data;
An image processing apparatus comprising: The image processing apparatus according to claim 5, wherein the first and second operations are operations that invert predetermined bits in pixel data. A seventh means for generating fifth image data by applying a predetermined first color conversion process to the fourth image data; and a predetermined second color conversion process to the second image data. And an eighth means for generating sixth image data.
The seventh means outputs pixel data in the fifth image data as pixel data constituting the composite image data when the second control signal is not activated, The sixth image data corresponding to the coordinates in the fifth image data of the pixel data in the fifth image data that matches the data representing the predetermined color when the control signal is activated The image processing apparatus according to claim 5 or 6, wherein pixel data located at coordinates in the inside is output as pixel data constituting the composite image data. The image processing apparatus according to claim 5, further comprising ninth means for delaying the second control signal by a predetermined time.

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