CN1504963A

CN1504963A - Color display method for black and white pictures

Info

Publication number: CN1504963A
Application number: CNA021508240A
Authority: CN
Inventors: 史新轲; 何代水; 蔡世光; 李黎; 涂剑锋
Original assignee: Inventec Appliances Shanghai Corp
Current assignee: Inventec Appliances Shanghai Corp
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2004-06-16
Anticipated expiration: 2022-11-29
Also published as: CN1311413C

Abstract

The invention provides a method to convert monochrome picture into color one for display. Its basic steps: divide a binary monochrome picture or the one with gradation effect into blocks; make statistic analysis, to obtain color bit value of the block; make stratified mapping, to obtain color bit value of the stratification; give different colors to different stratifications; and compare and contrast the stratification, give the color corresponding to the stratification to the block, and finish color display program.

Description

Black white image is carried out the colored method that shows

Technical field

The present invention with the soot-and-whitewash data that scale-of-two is preserved, can become coloured image with these data-switching, to be transplanted in the color system easily for some relevant for black white image or scale-of-two (binary) image are carried out the colored a kind of method that shows.

Background technology

The image of handling through scale-of-two has crucial meaning to feature extraction and pattern-recognition, so binary picture all has important use in fields such as industry, medical science, scientific research and commerce.Each pixel of binary picture is only represented by 1 bit, and is promptly non-black promptly white.Therefore in all images pattern, binary picture is again a kind of file minimum, needs the minimum image of memory space, therefore has many pictorial data to be converted into binary picture and preserve.Along with the development of microelectric technique is more and more progressive, color system also is widely used at leisure every field, more and more Duo black-and-white system is replaced by color system, the soot-and-whitewash data of many preciousnesses need be transplanted on the color system by black-and-white system now, therefore be necessary to develop a kind of method that black white image can be carried out colored demonstration, be used for original soot-and-whitewash data are transplanted to the color system easily from black-and-white system.Yet these are by the black white image of colour display screen, still can keep the characteristic of original image.

Summary of the invention

Purpose of the present invention is for providing a kind of method that black white image is converted to coloured image.

In order to reach purpose of the present invention, the invention provides a kind of soot-and-whitewash data that will be kept at originally in the black-and-white system, in color system, handle and the colored method that shows.Method comprises the following step: at first a black white image is pressed minimum statistics unit (MCU, optional 2 * 2,4 * 4 or 8 * 8) and carry out piecemeal; Then black white image is carried out statistical study, obtain the color bit value of this black white image piecemeal; Then the black white image after the statistical study is carried out the layering mapping, obtain the color bit value of black white image layering, the black white image that will have gradation effect carries out the contour hierarchy slicing of gray scale, extracts the color bit value that gray scale equates at interval out with a certain gray scale; The mapping color table of comparisons, the pixel that different gray scales are graded gives different colors; At last the color bit value of black white image piecemeal and the color bit value of black white image layering are compared, give corresponding color, finish the colour display screen program.

So can obtain former colour demonstration of deceiving from the black white image of image or tool gradation effect.

Description of drawings

For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and conjunction with figs., be described in detail below:

Fig. 1 carries out the colored simple and easy process flow diagram of software that shows with black white image.

Fig. 2 A is 2 * 2 minimum statistics unit method of partition synoptic diagram.

Fig. 2 B is 4 * 4 minimum statistics unit method of partition synoptic diagram.

Fig. 2 C is 8 * 8 minimum statistics unit method of partition synoptic diagram.

Fig. 3 shows that ranks add and the mean value of minimum statistics unit is asked the method synoptic diagram.

Fig. 4 is the piecemeal pixel bit table that shows the pixel bit value of black white image piecemeal.

Fig. 5 is a layering mapping method synoptic diagram.

Fig. 6 is the color sequence table of comparisons, converts monochrome pixels to its colour accordingly.

Embodiment

The present invention system provides a kind of method that shows with colour that black white image is converted to.

General scale-of-two (binary) black white image has gradation effect in order to make it, makes image that continuity more be arranged, and therefore can make scale-of-two and handle, as dithering.Be about to several adjacent in certain zone pixels in shade ratio in regional, determine that each pixel is black or white, so that people's vision forms a kind of illusion, feeling has gradation effect, just reaches the effect of gray scale with the method that reduces precision.

Fig. 1 is for realizing the simple and easy process flow diagram of this method.

Step 1 is carried out the minimum statistics unit and is cut apart.Needs are carried out the colored black white image that shows be divided into several piecemeals (shown in Fig. 2 B) by 4 * 4 minimum statistics unit, the big I of piecemeal is decided in its sole discretion, Fig. 2 A shows and black white image to be divided into 2 * 2 piecemeal, and Fig. 2 C shows and black white image is divided into 8 * 8 piecemeal.

Step 2 judges that whether non-the wide, high of block image be the integral multiple of minimum statistics unit.Any black white image not necessarily just is the integral multiple of minimum statistics unit doing when cutting apart.If the block image after cutting apart is wide, high for the integral multiple of non-minimum statistics unit, then carry out step 3, otherwise skip to step 4.

Step 3 pair block image procession adds.As shown in Figure 3, the block image procession of the integral multiple wide, that height is non-minimum statistics unit is added P, make the integral multiple that it is wide, height becomes the minimum statistics unit, make the black white image can complete cutting apart.

Step 4 judges whether that the every minimum statistics unit of cutting apart all disposes.Promptly judging whether to give the color of each piecemeal with mapping, is termination routine if handle.

Step 5 obtains the pixel bit value of block image.Black white image carries out analytic statistics by the minimum statistics unit to block image after over-segmentation.In general, choose the color of how many bits and think mapping, decide on the piece number of getting minimum unit piecemeal.With this example, former black white image be by 4 * 4 minimum statistics unit carry out piecemeal (piecemeal 1, piecemeal 2 ..., piecemeal n), therefore the color of getting 4 bits is thought mapping, just gets 16 kinds of colors altogether, thinks mapping so block image is also got the pixel bit value of 4 bits.For asking more accurate pixel bit value, again 4 * 4 minimum statistics unit piecemeal M are carried out 2 * 2 piecemeals, therefore can get 42 * 2 piecemeals (shown in Fig. 3, be respectively B1, B2, B3 and B4), wherein every 2 * 2 piecemeal is divided into 4 again, each little piecemeal is promptly represented a pixel (pixel), so can obtain the pixel bit value of four little piecemeals, then obtains the mean value of 4 pixels.If mean value is 1 greater than its value of getting of 0.5, its value of getting less than 0.5 is 0, so can obtain the pixel bit value of B1, B2, B3 and B4 respectively.Can obtain the pixel bit value of all piecemeals with same method, the value of gained is tabulating, as shown in Figure 4.

Step 6 is carried out the layering mapping, obtains the color bit value of black white image layering.Behind the piecemeal of intact all black white images of statistical study, then carry out the layering mapping.As shown in Figure 5, any width of cloth black white image can regard as two-dimentional coordinate system (x, y) the luminance function f on (x, y), if (x y) regards height on the two-dimentional coordinate system as, can be the layered plane C on some x-y of being parallel to plane like this f.(x y) cuts mutually, and its intersection is a level line, i.e. equi intensity curve D, layering number of plies visual image permissible accuracy and deciding in f on these planes.

Get 16 kinds of colors from the above altogether and think mapping, therefore the layering number of plies of black white image is also according to the color sum of getting, obtain 16 layers of layered plane C etc. gray scale layer (i.e. 16 equi intensity curve D), then obtain etc. the color bit value of gray scale layer at interval with a certain gray scale.The aforementioned minimum statistics unit piecemeal of mentioning to 4 * 4 carries out 2 * 2 again to be analyzed, and is meant that promptly gray scale at interval.Then each etc. the gray scale layer look the color mapping table comparison of its color bit value and Fig. 5, the color bit value of supposing certain first-class gray scale layer is 0101, the color table of comparisons is shown as magenta, then this gray scale layer colour display screen is a magenta; The color bit value of supposing certain first-class gray scale layer is 1011, and the color table of comparisons is shown as darkcyan, and then this gray scale layer colour display screen is a darkcyan.

Step 7 is carried out the color pairing.According to the result of step 5 and step 6 analytic statistics, search that each piecemeal is located in etc. the gray scale layer, give the color of the layering of block image mapping, until the color pairing of finishing whole black white image piecemeals, the colour that can obtain former black white image shows.Can be coloured image so with the black white image colour display screen.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly is familiar with present technique field person, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking the accompanying Claim book.

Claims

1, a kind ofly converts black white image the method for coloured image to, comprise the following steps:

One black white image is carried out piecemeal;

Obtain the pixel bit value of this black white image piecemeal;

To gray scale layerings such as this black-white point look like to carry out, obtain the color bit value of these gray scale layerings;

Give different these gray scale layerings with different colors; And

Compare these gray scale layerings, give the color of this black white image piecemeal, finish the colour display screen program with corresponding these gray scale layerings.

2, as claimed in claim 1ly convert black white image the method for coloured image to, it is characterized in that this black white image is the scale-of-two black white image of tool gradation effect.

3, as claimed in claim 1ly convert black white image the method for coloured image to, it is characterized in that, carry out this black white image system and carry out piecemeal according to the minimum statistics unit.

4, as claimed in claim 3ly convert black white image the method for coloured image to, it is characterized in that, have four little piecemeals with this black white image piecemeals of 2 * 2 piecemeals, each little piecemeal is a pixel.

5, as claimed in claim 4ly convert black white image the method for coloured image to, it is characterized in that the pixel bit value of this black white image piecemeal is obtained by the pixel average of each this black white image piecemeal.

6, the method that black white image is converted to coloured image as claimed in claim 3, it is characterized in that, if wide, the height of this black white image piecemeal are the integral multiple of non-minimum statistics unit, then procession adds, and makes the integral multiple of the minimum statistics unit that it is wide, height becomes this black white image piecemeal.

7, as claimed in claim 1ly convert black white image the method for coloured image to, it is characterized in that the bit number of the pixel bit value of this black white image piecemeal is decided on getting color bit number.

8, as claimed in claim 1ly convert black white image the method for coloured image to, it is characterized in that, these gray scale layering numbers of plies are decided on the bit number of the color of being got.

9, as claimed in claim 7ly convert black white image the method for coloured image to, it is characterized in that, each this black white image piecemeal promptly represent this black white image etc. the gray scale layer.

10, as claimed in claim 1ly convert black white image the method for coloured image to, it is characterized in that the density degree that with this black white image by the minimum statistics unit is unit makes this black white image have color continuity behind colour display screen to divide equi intensity curve.

11, as claimed in claim 1ly convert black white image the method for coloured image to, it is characterized in that, these gray scale layering colors obtain and contrast a color mapping table.

12, as claimed in claim 11ly convert black white image the method for coloured image to, it is characterized in that the number of colours of this color table of comparisons is decided on the bit number of getting color.