JPS6252679A - Image processor - Google Patents

Abstract

PURPOSE:To speedily modify and restore a color by rewriting a look-up table so as to modify the color of an image. CONSTITUTION:When only the color of an image A is changed to other colors, in case of the image A present in a background B, first a processor 5 transmits a data D1 to a logic image memory 1. Then the value of a pixel corresponding to an area A where the color is modified is stored previously as '1' in the logic image memory 1, while the value of a pixel corresponding to an area B where the color is not modified is set as '0' in the memory 1. The value D3 ('1' in this case) of the pixel corresponding to the area A is transmitted to the look-up table LUT 3 from the logic image memory 1, while a dark and light image data D4 corresponding to the area A is transmitted from an image memory 2. As a result, data on addresses outputted from the LUT 3 becomes C7...C11, which is transmitted to a DA converter 4 and used for image display.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field> The present invention particularly relates to an image processing device capable of changing color, density, etc. of an image.

<Prior Art> In the past, changing colors has often been done as one of the image processing techniques. For example, by changing only the color data of areas corresponding to leaves in a landscape image from green to yellow, a new image with a different flavor from the original image has been generated. In short, for this process, each of the RED, GREEN, and BLUE data of each image pixel may be replaced with different data. However, if the data of each image pixel is to be rewritten every time the color is changed, the number of accesses from processing hardware such as a CPU to the image memory will naturally increase.

For this reason, color change processing by rewriting the image memory inevitably increases processing time. Therefore fast responsiveness? Frequent color changing operations are not suitable for systems that require high resolution or extremely large image memory storage capacities, and therefore require the aid of specially configured hardware (e.g., a dedicated image processing processor). 7c ') L fc.

Furthermore, in the process of changing the color form by rewriting the image memory, once the image data is changed, the original data is erased. Therefore, like in a color change simulation, what are the original colors and the changed colors? It is unsuitable for systems that require frequent comparisons.

Purpose> The present invention has been made in view of the above conventional problems,
Is it possible to partially change the color of an image with a relatively simple configuration? A system that can run quickly? Its purpose is to provide.

<Embodiment> Hereinafter, an embodiment of the image processing apparatus according to the present invention will be explained in detail with reference to the drawings. FIG. 1 is a partial block diagram of an embodiment of the image processing apparatus according to the present invention. show. 1
2 is a logical image memory to be described later; 2 is an image memory provided corresponding to R (red), G (green), and B (blue) and stores density information; o3 is a look-up table;
The output (video analog signal) of OD/A converter 4, which is a 4HD/A converter, is sent to flcRT for image display. The lookup table 3 is a type of arithmetic unit, and is a static R
The data output from the 0 image memory 2 and the logical image memory 1, which are composed of A. Type information Converts to separate information (8 bits) 0 However, here, when the least significant bit of the address signal of lookup table 3 is 1, the data is switched, and when the least significant bit is O, the data is switched. Table data r of look amplifier table 3 is determined so as not to switch.

As shown in Figure 2, when image A exists in background B, if you want to change only the color of image A to a different color, do the following process? Let's do it.

The data DI is sent to the logical image memory 1 by the processing of the processor 5 in the first region, and the value i of the pixel corresponding to the area A whose color is to be completely changed is stored in this logical image memory 1 in advance.
1 and is stored as the value to of a pixel corresponding to area B where the color is not completely changed. On the other hand, data D2 is sent to the image memory 2 through processing by the processor 5, and the image memo! Grayscale image data consisting of 7 pits is stored in J2 (capacity of mXnX8 bits when composed of mXn pixels).

Next, as shown in the data flow in Figure 3, the image display 7
In this case, the pixel value D3 (1 in this case) corresponding to the area A to be changed is sent from the logical image memory l to the look amplifier table 3, and the 7-pit shading corresponding to the area A is sent from the image memory 2. Image data D4
(a7a6a5a4a 3 a 2 a 1) is sent'
i'', the data at the address specified by the upper 7 bits D4 and the lowest 1 bit D3 of lookup table 3 is C7C6C3C4C3C2C11.
This data is converted to D5, which is sent to the D/A converter 4.
I'll send it to you. On the other hand, color from logical image memo +71 in lookup table 3? The pixel value D3 (in this case O) corresponding to the area B that will not be changed is sent, and the 7-pit grayscale image data D4 (in this case O) corresponding to the area B is sent from the image memory 2.
When b7b6b5b4b3b2b is sent, the data at the address specified by D4 of the top 7 pits and D3 of the lowest 7 pits in look amplifier table 3 is b7b.
6b5b4b3b2b, 0 is converted into this data D5, which is sent to the D/A converter 4.

If the contents of the table data of lookup table 3 are adjusted as described above, the contents of the lookup table will differ depending on whether the least significant bit of the input address value is 1 or 0. Since it is referenced, it is possible to easily control whether or not to change the grayscale image data.

Specifically, as shown in FIG. 4(a), the value of D3 (
Table data of lookup table 3 so that exactly the same data as the input address value is output regardless of whether the input address value is 0 or l)? Once formed, there is no change in color. But the fourth
As shown in Figure (b), if the table data of the lookup table 3 is formed so that data different from the input address value is output according to the value of D3, only a specific part (
Here, the color of area A) is changed. In other words, only the data at odd addresses are raised, so that area A
brightness improves. This processing is a kind of emphasis processing, but by switching the table data of the lookup table 3, other processing such as binarization and inversion of the shading of the area A can also be executed.

Effects> According to the present invention, the color change of an image is performed by rewriting the lookup table, so it can be performed with much less processing than the conventional direct rewriting processing for the image memory. Since the contents of the image memory itself are saved, colors can be changed and restored at high speed.

[Brief explanation of drawings]

Fig. 1 is a partial block diagram of an embodiment of an image processing device according to the present invention, Fig. 2 is an explanatory diagram of an image, Fig. 3 is an explanatory diagram of data flow, and Fig. 4 is a Luso backup table. The characteristic diagram of In the figure, l: logical image memory 2: image memory 3 cork backup table 4: D/A converter 5: processor 6: main memory 7: latch circuit 8: gate agent Patent attorney Ai Mu Fuku (and 2 others) )87Figure 2Figure 3(a)
(b) Figure 4

Claims (1)

[Claims] 1. an image memory that stores density data of each pixel constituting an image; a logical image memory that stores data that determines a pixel corresponding to an area in which the density data is to be changed; and output data of the image memory and the logical image memory. is introduced, and is characterized by comprising: a lookup table for rewriting and setting the density data of pixels corresponding to the area where the density data is to be changed; and a display means for displaying an image based on the output of the lookup table. Image processing device.