CN201877112U

CN201877112U - Device for de-jittering image signal

Info

Publication number: CN201877112U
Application number: CN2010206253044U
Authority: CN
Inventors: 陈煜�; 倪俊达; 胡旭; 花周军
Original assignee: SHANGHAI YUXIN TECHNOLOGY Co Ltd
Current assignee: SHANGHAI YUXIN TECHNOLOGY Co Ltd
Priority date: 2010-11-25
Filing date: 2010-11-25
Publication date: 2011-06-22
Anticipated expiration: 2020-11-25

Abstract

The utility model provides a device for de-jittering an image signal, which relates to the field of image processing. The device comprises an error calculation circuit, an error configuration circuit and an image generating circuit, wherein an image input signal is input to the error calculation circuit and the image generating circuit at the same time; the error calculation circuit is connected to the image generating circuit through the error configuration circuit; and the image generating circuit outputs a new de-jittered image signal. An error diffusion process can be realized only by using the error configuration circuit, so that a hardware structure is simplified. Simultaneously, an original signal is not stored in the error configuration circuit, so that the storage resource of the error configuration circuit can be saved greatly and the effect of reducing the hardware cost is achieved.

Description

A kind of device that picture signal is gone dithering process

Technical field

The utility model relates to a kind of image processing techniques, particularly a kind of device that picture signal is gone dithering process.

Background technology

Because the pixel bit depth of LCDs (LCD) is generally less than 24, so need cut out the Pixel Information of low level when being shown to 24 image on the LCDs.With the RGB565 LCDs is example, and the figure place of 565 expressions red (R), green (G) and blue (B) passage is respectively 5,6,5, and the figure place addition of three color channels of RGB equals 16, represents that promptly this signal has 16 (bit).If 24 RGB888 signals are shown on 16 the RGB565 LCDs, because 8 R channel signals can only show 5, so need cut out low 3 signal, same, the G passage will cut out low 2, and the B passage will cut out and hang down 3.If only adopt simple cut position method, can make image produce fixing error color lump, therefore, adopt usually in the prior art and remove the error diffusion method shaken, make the cut position quantization error be distributed to entire image, thereby avoid the appearance of error color lump.

The existing dither image disposal route of going, at first the pixel in the original RGB888 signal (24) is carried out the buffer memory of delegation, calculate propagated error on all directions respectively according to the shake coefficient again, on the pixel around at last these propagated errors being added to generate new pixel value.These calculating all are to finish jointly by shift unit and multiplier, and hardware configuration is comparatively complicated.In addition, because traditional dither image disposal route of going must be carried out buffer memory to 24 original signals,, cause the wasting of resources so the spatial cache that takies is bigger.

The utility model content

The purpose of this utility model is to provide a kind of picture signal is removed the device of dithering process, can efficiently simplify hardware configuration.

The utility model solves above-mentioned technical matters by such technical scheme:

A kind of picture signal is removed the device of dithering process, this device comprises that an error calculation circuit, an error configuration circuit and an image produce circuit; Image input signal inputs to error calculation circuit simultaneously and image produces circuit, and error calculation circuit is connected to image by the error configuration circuit and produces circuit, produces the new picture signal of circuit output through dithering process by image.

As further improvement, the error configuration circuit can be made up of register.

Mode of going the dithering process device to table look-up of the present utility model by employing, make error diffusion process only the use error configuration circuit can realize, simplified hardware configuration.Simultaneously, original signal is not stored in the error configuration circuit, can saves the storage resources of error configuration circuit greatly, reach the effect that reduces hardware cost.

Description of drawings

Fig. 1 is the structural drawing that removes the dithering process device of the present utility model;

Fig. 2 is the workflow diagram that removes the dithering process device of the present utility model.

Embodiment

See also Fig. 1, the utility model provides a kind of picture signal is removed the device of dithering process, and this device comprises that an error calculation circuit 1, an error configuration circuit 2 and an image produce circuit 3.Image input signal inputs to error calculation circuit 1 simultaneously and image produces circuit 3, and error calculation circuit 1 is connected to image by error configuration circuit 2 and produces circuit 3, produces the new picture signal of circuit 3 outputs through dithering process by image.

Error calculation circuit 1 can be used for receiving the capable image input signal of i, and (wherein, i, j are nonnegative integer for i, the j) propagated error of pixel, and obtain error signal ERRO according to this propagated error to obtain this row respectively.

Error configuration circuit 2 can be made up of register, and it can be used to preserve the error signal ERRO that error calculation circuit 1 obtains.

Image produces circuit 3 and can be used for receiving the capable image input signal of i, and reads error signal ERRO from error configuration circuit 2, is that (i, the value of pixel j) are obtained pixel (i, j) the new value after going dithering process in conjunction with error signal ERRO and coordinate.

See also Fig. 2, utilize a kind of that the utility model provides to go the device of dithering process simply effectively to go dithering process to picture signal to picture signal, each pixel of picture signal produces according to pixel coordinate, goes the method for dithering process to comprise the steps::

Step 1, receive the capable image input signal of i, calculate in this row coordinate respectively for (wherein, i, j are nonnegative integer for i, the j) propagated error of pixel; Propagated error is the lowest order decision minimum two decisions or coordinate by coordinate, such as i=15, and j=17, the propagated error of so corresponding this coordinate is exactly { 2 ' b11,2 ' b01} or { 1 ' b1,1 ' b1}

Step 2, the propagated error of pixel in the step 1 is obtained error signal ERRO by error calculation circuit 1;

Can determine error value E RRO_R and ERRO_B according to the propagated error that obtains in the step 1 { i[1:0], the j[1:0] } a that tables look-up, table b to these two components of R/B, for example, i[1:0], j[1:0] }={ 3,1} then can find ERRO_R=3 in table a, can find ERRO_B=3 in table b

The propagated error that obtains according to step 1 i[0], j[0], the c that tables look-up can determine the error value E RRO_G to the G component, for example, i[0] .j[0]={ 1,1} then can find ERRO_R=1 in table c

Step 3, receive the capable image input signal of i, and be that (i, the value of pixel j) calculate pixel (i, j) the new value after going dithering process in conjunction with error signal ERRO and coordinate;

R_New(i，j)＝R_In(i，j)+ERRO_R(i，j)

G_New(i，j)＝G_In(i，j)+ERRO_G(i，j)

B_New(i，j)＝B_In(i，j)+ERRO_B(i，j)

Step 4, i, j are got different values, repeat above-mentioned steps 1 to 3, each pixel in this image is all till the past dithering process.

The error amount table of table a R component

The error amount table of table b B component

The error amount table of table c G component

More than disclosed only be several specific embodiments of the application, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection domain.

Claims

1. one kind is removed the device of dithering process to picture signal, it is characterized in that: this device comprises that an error calculation circuit, an error configuration circuit and an image produce circuit; Image input signal inputs to error calculation circuit simultaneously and image produces circuit, and error calculation circuit is connected to image by the error configuration circuit and produces circuit, produces the new picture signal of circuit output through dithering process by image.

2. as claimed in claim 1 picture signal is removed the device of dithering process, it is characterized in that: the error configuration circuit can be made up of register.