Consult android image processing techniques

image processing android Pictures

Analogy: The specification of the picture is: 480 * 800's

Then processed into specifications: 800 * 480

There is no feasible solution, as long as generate 800 * 480 format, the original picture without distortion on the line. Guiqiu expert!<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
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You can customize the background
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Creating Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...
Create a Canvas
Canvas canvas = new Canvas (bitmap)
Calculate the middle position, the original drawing up
canvas.drawBitmap ...
If you need to save the bitmap into a JPG / PNG, selected high quality
bitmap.compress ...
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2nd Floor positive solutions, layout can be used ImageView, set the property to fitY, or center
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In the final analysis, is a picture made a scaling algorithm!
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references, 4th Floor xidianstudent reply:

final analysis, the picture did a scaling algorithm!

Find detailed algorithm code
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reference to the second floor youngc527 reply:

create Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...
Create a Canvas
Canvas canvas = new Canvas (bitmap)
Calculate the middle position, the original drawing up
canvas.drawBitmap ...
If you need to save the bitmap into a JPG / PNG, selected high quality
bitmap.compress ...

Brother, can then elaborate
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Try this method

 / ** 
* Picture zoom 
* @ Param bigimage 
* @ Param newWidth 
* @ Param newHeight 
* @ Return 
* / 
public Bitmap tochange (Bitmap bigimage, int newWidth, int newHeight) {
/ / Get the image width and height 
int width = bigimage.getWidth (); 
int height = bigimage.getHeight (); 
Matrix object 
 / / create an action picture with aMatrix matrix = new Matrix (); 
/ / Calculate the zoom ratio, a new dimension in addition to the original size 
float scaleWidth = ((float) newWidth) / width; 
float scaleHeight = ((float) newHeight) / height; 
/ / Scale the image motion 
matrix.postScale (scaleWidth, scaleHeight); 
Bitmap bitmap = Bitmap.createBitmap (bigimage, 0, 0, width, height, matrix, true); 
return bitmap; 
} 

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Create an empty Bitmap, and then use that to create a bitmap canvas after scaling the original image, drawn on the canvas.
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reference to the 8th floor BuleRiver reply:

create an empty Bitmap, and then use that to create a bitmap canvas after scaling the original image, drawn on the canvas .

Share the code
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reference to the second floor youngc527 reply:

create Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...
Create a Canvas
Canvas canvas = new Canvas (bitmap)
Calculate the middle position, the original drawing up
canvas.drawBitmap ...
If you need to save the bitmap into a JPG / PNG, selected high quality
bitmap.compress ...

 Bitmap bitmap = Bitmap.createBitmap (800, 480, Config.ARGB_8888) ;/ / create a background of a 800 * 480! 
Canvas canvas = new Canvas (bitmap) ;/ / create a Canvas 
canvas.drawBitmap (bitmap, matrix, paint); / / artwork does not seem to be able to draw up a way 

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reference to the second floor youngc527 reply:

create Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...
Create a Canvas
Canvas canvas = new Canvas (bitmap)
Calculate the middle position, the original drawing up
canvas.drawBitmap ...
If you need to save the bitmap into a JPG / PNG, selected high quality
bitmap.compress ...

drawBitmap method to draw up the original, did not find the similar parameter

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reference to the second floor youngc527 reply:

create Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...
Create a Canvas
Canvas canvas = new Canvas (bitmap)
Calculate the middle position, the original drawing up
canvas.drawBitmap ...
If you need to save the bitmap into a JPG / PNG, selected high quality
bitmap.compress ...

 public class MyView extends View {

private Paint paint; 
private Canvas canvas; 

public MyView (Context context) {
super (context); 
paint = new Paint (); 
paint.setAntiAlias ​​(true); 
this.setKeepScreenOn (true); 
paint.setColor (Color.RED); 

} 

public void OnDraw (Canvas canvas) {
Bitmap bg = Bitmap.createBitmap (
BitmapFactory.decodeResource (getResources (), R.drawable.abc), 
0, 0, 800, 480) ;/ / 800 * 480 background image 
Bitmap bitmap = BitmapFactory.decodeResource (getResources (), 
R.drawable.canvas_top) ;/ / target picture 
canvas = new Canvas (bg); 
canvas.save (Canvas.ALL_SAVE_FLAG); 
canvas.restore (); 
int width = bitmap.getWidth (); 
int height = bitmap.getHeight (); 
tochange (bitmap, width / 2, height / 2) ;/ / target image compression 
canvas.drawBitmap (bitmap, 0, 0, paint); 

} 

public Bitmap tochange (Bitmap bitmap, int newWidth, int newHeight) {
int width = bitmap.getWidth (); 
int height = bitmap.getHeight (); 
Matrix matrix = new Matrix (); 
float scaleWidth = ((float) newWidth) / width; 
float scaleHeight = ((float) newHeight) / height; 
matrix.postScale (scaleWidth, scaleHeight); 
Bitmap bm = Bitmap.createBitmap (bitmap, 0, 0, width, height, matrix, 
true); 
return bm; 

} 
} 

This is not, but does not show the test
Reply:

reference to the 12th floor xiaobeiweng reply:

Quote: references to the second floor youngc527 reply:

Creating Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...

 public class MyView extends View {
... 
} 

Is not this, but does not show

test

reference to the 10th floor u010749756 reply:

Quote: references to the second floor youngc527 reply:

Creating Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...

 Bitmap bitmap = Bitmap.createBitmap (800, 480, Config.ARGB_8888) ;/ / create a background of a 800 * 480! 
Canvas canvas = new Canvas (bitmap) ;/ / create a Canvas 
canvas.drawBitmap (bitmap, matrix, paint); / / artwork does not seem to be able to draw up a way 

 

private Bitmap scale (Bitmap origin) {
Bitmap bitmap = Bitmap.createBitmap (800, 480, Config.ARGB_8888); 
Canvas canvas = new Canvas (bitmap); 
Rect target = null; 
int orgWidth = origin.getWidth (), orgHeight = origin.getHeight (); 
int bgHeight = bitmap.getHeight (), bgWidth = bitmap.getWidth (); 
if (orgWidth * bgHeight> orgHeight * bgWidth) {
int newWidth = bgWidth, newHeight = newWidth * orgHeight / orgWidth; 
target = new Rect (0, (bgHeight - newHeight) / 2, newWidth, (bgHeight + newHeight) / 2); 
} Else {
int newHeight = bgHeight, newWidth = newHeight * orgWidth / orgHeight; 
target = new Rect ((bgWidth - newWidth) / 2, 0, (bgWidth + newWidth) / 2, newHeight); 
} 
canvas.drawBitmap (origin, null, target, new Paint (Paint.DITHER_FLAG | Paint.FILTER_BITMAP_FLAG)); 
return bitmap; 
} 

Reply:

reference to the 13th floor youngc527 reply:

Quote: references to the 12th floor xiaobeiweng reply:

Quote: references to the second floor youngc527 reply:

Creating Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...

 public class MyView extends View {
... 
} 

Is not this, but does not show

test

reference to the 10th floor u010749756 reply:

Quote: references to the second floor youngc527 reply:

Creating Bitmap
of a 800 × 480Bitmap bitmap = Bitmap.createBitmap ...

 Bitmap bitmap = Bitmap.createBitmap (800, 480, Config.ARGB_8888) ;/ / create a background of a 800 * 480! 
Canvas canvas = new Canvas (bitmap) ;/ / create a Canvas 
canvas.drawBitmap (bitmap, matrix, paint); / / artwork does not seem to be able to draw up a way 

 

private Bitmap scale (Bitmap origin) {
Bitmap bitmap = Bitmap.createBitmap (800, 480, Config.ARGB_8888); 
Canvas canvas = new Canvas (bitmap); 
Rect target = null; 
int orgWidth = origin.getWidth (), orgHeight = origin.getHeight (); 
int bgHeight = bitmap.getHeight (), bgWidth = bitmap.getWidth (); 
if (orgWidth * bgHeight> orgHeight * bgWidth) {
int newWidth = bgWidth, newHeight = newWidth * orgHeight / orgWidth; 
target = new Rect (0, (bgHeight - newHeight) / 2, newWidth, (bgHeight + newHeight) / 2); 
} Else {
int newHeight = bgHeight, newWidth = newHeight * orgWidth / orgHeight; 
target = new Rect ((bgWidth - newWidth) / 2, 0, (bgWidth + newWidth) / 2, newHeight); 
} 
canvas.drawBitmap (origin, null, target, new Paint (Paint.DITHER_FLAG | Paint.FILTER_BITMAP_FLAG)); 
return bitmap; 
} 

Really, really too thanks! If you add on the original drag, background static, how to achieve?
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Thanks to not give points, who are willing to control you ah!
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