CN102005035A - Pseudocolor processing method of B/W (Black/White) video system - Google Patents

Abstract

The invention relates to a pseudocolor processing method of a B/W video system, which comprises the following steps: inputting the images, which are obtained after being processed by red/green/blue light filters by using a standard colorimetric plate, into a computer, computing environment coefficients, inputting actual images by using the same method, and storing the actual images into the computer to carry out pseudocolor processing. Compared with the traditional B/W video system, the system of the invention enables a common video camera to have the capability of color identification; and compared with the traditional color video system, the system of the invention has the advantages that distortion of color images processed by computer software is small, data occupied space is small, and the overall information data amount of the images is basically identical to that of the images taken by a common B/W video camera. In addition, the invention has the characteristics of small size, light weight and low cost.

Description

Black and white camera system pseudo-colours disposal route

Technical field

The present invention relates to a kind of image processing techniques, particularly a kind of black and white camera system pseudo-colours is handled.

Background technology

Pseudo-colours is a kind of for improving visual effect, the color treatment technology of different false colors that utilizes the computer picture enhancement techniques that the gray scale of image is given.Each pixel value of pseudo-colours (Pseudo-color) image is actually an index value or code, this code value is as color look-up table CLUT(Color Look-Up Table) in a certain entry address, can find out the intensity level that comprises actual R, G, B according to this address.The color that this usefulness is searched the method generation of mapping is called pseudo-colours.

Be B(i)=[R(i), B(i), G(i)] (1)

B(i wherein) represents different gray-scale values, R, G, B represent the three primary colours component value. because human eye can only be distinguished the gray-scale value of kind of different brackets surplus in the of 20, but can distinguish the colour of several thousand kinds of different colourities and different brightness, therefore if when showing or write down, black white image is transformed into the degree of discrimination that coloured image not only can improve image, also can satisfy some special requirement simultaneously.As at military affairs, exploration, medicine, biotechnology all has important and uses widely in the rocking bar field, ocean.

In traditional pseudo-colours was handled, man-to-man computing mainly contained following several algorithm between this input and output pixel: gray scale top and bottom process and converter technique.

The gray scale top and bottom process: the gray scale demixing technology is one of straightforward procedure in the pseudo-colours treatment technology.It supposes the strength function of piece image being regarded as a two dimension, and this method may be interpreted as: do a plane, make its coordinate plane that is parallel to image, so, each plane is carried out layering to function on the zone of intersecting.As at gray level l1, l2, l3 ..., M plane of lm place definition, make l0 representative black [f (x, y)=0] and l(m+1) representative in vain [f (and x, y)=L].Suppose 1＜M＜L, this M plane is divided into M+1 zone with gray-scale value, and comes the regulation colour according to following formula:

If

(2)

In the formula

By layered plane defined with

The colour that the zone is relevant, though this top and bottom process comparison is directly perceived, simple, this principle is mentioned the technical conditions restriction, colour shine upon seldom in institute.

Converter technique: can be described as from the general extent:

（3）

R(x wherein y), G(x, y), B(x, y) is respectively three kinds of component values of coloured image RGB; F(x y) is original gray value; And ,

,

Represent the mapping relations of tristimulus value and gray-scale value respectively.

Following formula (3) illustrates that converter technique is that the gray-scale value of input picture is realized three kinds of independent conversion, becomes the RGB 3 primary color values values of different size by the different mappings of gray scale system.

With regard to pseudo-colours algorithm in above-mentioned 2, the back is a kind of obviously than preceding a kind of practicality and accuracy of having more.The colour that it can shine upon generally can reach kind more than 500.

Summary of the invention

The present invention be directed to the not enough problem that the pseudo-colours method is used in fields such as monitoring camera-shootings, a kind of black and white camera system pseudo-colours disposal route has been proposed, the figure that traditional common B is photographed under various environment returns to coloured image mutually, and makes the color of recovery have reliability.

Technical scheme of the present invention is: a kind of black and white camera system pseudo-colours disposal route is characterized in that method comprises the steps:

1) pre-service: B is taken on-gauge plate earlier, has at least in the on-gauge plate with the on-gauge plate of RGB as 3 primary colours, and driving control device drives the redgreenblue optical filter, every the set time

, one of them can draw piece image by camera the redgreenblue optical filter, through 3

Time after draw the set of diagrams picture, draw environmental coefficient according to this group three primary colours gray-scale value application of formula in image:

*?

?=?

；

2), constructor and conversion are found the solution: set up function according to the environmental coefficient that we try to achieve in the last step ,

,

, f(x y) is original gray value; And

,

,

Represent the mapping relations of tristimulus value and gray-scale value respectively, on-gauge plate is become subject, utilize the linkage in the step 1) to drive the set of diagrams picture that three-colour filter is taken equally, image is passed to computing machine, just can be according to formula

Try to achieve the RGB of the color of asking, R(x wherein y), G(x, y), B(x, y) is respectively three kinds of component values of coloured image RGB

Beneficial effect of the present invention is: black and white camera system pseudo-colours disposal route of the present invention, compare with traditional black and white camera system, and this system makes common video camera have colored recognition capability; Compare with traditional color camera system, this system coloured image distortion after the machine software processes as calculated is little, and it is little to take data space, and the captured image of the overall information data volume of image and common B is basic identical.In addition, it is little, in light weight also to have a volume, the characteristics that cost is low.

Description of drawings

Fig. 1 is a black and white camera system structural representation of the present invention;

Fig. 2 is 24 colour tables wavelength-reflectivity Characteristics figure.

Embodiment

Black and white camera system structural representation as shown in Figure 1, it mainly comprises camera system and software processing system two parts.Camera system mainly comprises driving control device 1, B 3 and additional filtering apparatus 2, driving control device 1 drives filtering apparatus 2 and moves or the turned position, when the irradiate light object is reflected filtering apparatus 2 through video camera 3, this treated black white image is obtained and is stored by video camera 3, pass to computing machine 4 by connection device afterwards, through after the computed in software, revert to coloured image.

In the environment of variations such as light intensity light and shade, can access accurate relatively color pattern in order to make, the present invention is a benchmark with standard 24 colour atlas, and seeing through optical filter by color block (mainly being the blue three primary colours of the reddish yellow) reflection ray that this plate provided is that benchmark makes up operating function.

When colorize is handled, by the input object under test G(R), G(G), G(B) gray-scale value just can be in the hope of asking color rgb value.

Among the present invention, main part is filtering apparatus and computer software, and according to concrete needs difference, this system divides two kinds of forms: a kind of is that general image recovers, and promptly realizes general image colorize (specific descriptions are seen embodiment one); Another kind is directly camera watch region to be carried out the space to divide, and makes in the visual field of its shooting directly to be divided into zones of different.Its function is certain objects in the camera system shooting environmental to be carried out colorize handle (specific descriptions are seen embodiment two).By its characteristics; First kind can restore whole captured image and its visual field not had additional requirement, and shortcoming is that consumed energy is bigger.Second kind of device is exquisite, simple in structure, and shortcoming is object electro-optical device each zone in the shooting visual field after filtration of color to be measured in the requirement image.

Embodiment one:

1, determines benchmark: shown in black and white camera system structural representation, in pre-service, video camera is earlier taken (in 24 colour tables be benchmark with RGB as 3 primary colours) to 24 colour standard plates, makes driving control device 1 drive redgreenblue optical filter 2 during shooting, every the set time , one of them can draw piece image by camera the redgreenblue optical filter, like this through 3

Time after draw the set of diagrams picture, draw environmental coefficient according to this group three primary colours gray-scale value application of formula (4) in image:

*?

?=?

（4）

2, constructor and conversion are found the solution: set up function according to the environmental coefficient that we try to achieve in the last step

,

,

We become subject with on-gauge plate afterwards, utilize the linkage in the step 1 to drive 3 photos that three-colour filter is taken equally, pass to computer software, just can try to achieve the RGB of the color of asking according to formula (3).

Embodiment two:

1, determines benchmark: shown in black and white camera system structure principle chart, in pre-service, video camera is earlier taken (in 24 colour tables be benchmark with RGB as 3 primary colours) to 24 colour standard plates, makes mechanical hook-up drive the redgreenblue optical filter during shooting, every the set time , one of them can draw piece image by camera the redgreenblue optical filter, like this through 3

Time after draw the set of diagrams picture, draw environmental coefficient according to this group three primary colours gray-scale value application of formula 4 in image.

2, constructor and conversion are found the solution: after drawing transition function, we handle camera head, before camera, add the optical filter of forming by three-colour filter, can find in captured image that like this scene is divided into 3 parts, only need pass to computer software to object under test through trizonal black white image this moment, just can obtain the RGB of this object.

Claims (1)

1. a black and white camera system pseudo-colours disposal route is characterized in that method comprises the steps:

1) pre-service: B is taken on-gauge plate earlier, has at least in the on-gauge plate with the on-gauge plate of RGB as 3 primary colours, and driving control device drives the redgreenblue optical filter, every the set time

, one of them can draw piece image by camera the redgreenblue optical filter, through 3

Time after draw the set of diagrams picture, draw environmental coefficient according to this group three primary colours gray-scale value application of formula in image:

*?

?=?

；

2), constructor and conversion are found the solution: set up function according to the environmental coefficient that we try to achieve in the last step

,

,

, f(x y) is original gray value; And

,

,

Represent the mapping relations of tristimulus value and gray-scale value respectively, on-gauge plate is become subject, utilize the linkage in the step 1) to drive the set of diagrams picture that three-colour filter is taken equally, image is passed to computing machine, just can be according to formula

Try to achieve the RGB of the color of asking, R(x wherein y), G(x, y), B(x, y) is respectively three kinds of component values of coloured image RGB.

Images