forked from bartvdbraak/blender
After reviewing the channel keyer algorithm, I found that the chroma keyer algorithm was fundamentally the same. Took the opportunity to implement
a different chroma keying algorithm. This also solves the problem of the poor UI I had on the chroma key node.
This commit is contained in:
parent
29ae98f501
commit
4d56baa8da
@ -868,11 +868,11 @@ bNode *nodeAddNodeType(bNodeTree *ntree, int type, bNodeTree *ngroup)
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else if(type==CMP_NODE_COLOR_SPILL){
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else if(type==CMP_NODE_COLOR_SPILL){
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NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node chroma");
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NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node chroma");
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node->storage=c;
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node->storage=c;
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c->t1= 0.0f;
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c->t1= 30.0f;
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c->t2= 0.0f;
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c->t2= 10.0f;
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c->t3= 0.0f;
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c->t3= 0.0f;
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c->fsize= 0.0f;
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c->fsize= 0.0f;
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c->fstrength= 0.0f;
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c->fstrength= 1.0f;
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node->custom1= 1; /* red channel */
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node->custom1= 1; /* red channel */
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}
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}
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else if(type==CMP_NODE_CHROMA){
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else if(type==CMP_NODE_CHROMA){
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@ -883,7 +883,6 @@ bNode *nodeAddNodeType(bNodeTree *ntree, int type, bNodeTree *ngroup)
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c->t3= 0.0f;
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c->t3= 0.0f;
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c->fsize= 0.0f;
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c->fsize= 0.0f;
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c->fstrength= 0.0f;
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c->fstrength= 0.0f;
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node->custom1= 1; /* green */
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}
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}
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else if(type==CMP_NODE_CHANNEL_MATTE){
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else if(type==CMP_NODE_CHANNEL_MATTE){
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NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node chroma");
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NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node chroma");
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@ -4663,6 +4663,7 @@ static bNodeType cmp_node_color_spill={
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/* ******************* Chroma Key ********************************************************** */
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/* ******************* Chroma Key ********************************************************** */
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static bNodeSocketType cmp_node_chroma_in[]={
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static bNodeSocketType cmp_node_chroma_in[]={
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{SOCK_RGBA,1,"Image", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
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{SOCK_RGBA,1,"Image", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
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{SOCK_RGBA,1,"Key Color", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
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{-1,0,""}
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{-1,0,""}
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};
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};
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@ -4674,69 +4675,83 @@ static bNodeSocketType cmp_node_chroma_out[]={
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static void do_rgba_to_ycca_normalized(bNode *node, float *out, float *in)
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static void do_rgba_to_ycca_normalized(bNode *node, float *out, float *in)
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{
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{
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/*normalize to the range -1.0 to 1.0) */
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rgb_to_ycc(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
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rgb_to_ycc(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
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out[0]=(out[0])/255;
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out[0]=((out[0])-16)/255.0;
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out[1]=(out[1])/256;
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out[1]=((out[1])-128)/255.0;
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out[2]=(out[2])/256;
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out[2]=((out[2])-128)/255.0;
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out[3]=in[3];
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out[3]=in[3];
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}
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}
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static void do_normalized_ycca_to_rgba(bNode *node, float *out, float *in)
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static void do_normalized_ycca_to_rgba(bNode *node, float *out, float *in)
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{
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{
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in[0]=in[0]*255;
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/*un-normalize the normalize from above */
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in[1]=in[1]*256;
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in[0]=(in[0]*255.0)+16;
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in[2]=in[2]*256;
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in[1]=(in[1]*255.0)+128;
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in[2]=(in[2]*255.0)+128;
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ycc_to_rgb(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
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ycc_to_rgb(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
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out[3]=in[3];
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out[3]=in[3];
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}
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}
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static void do_chroma_key(bNode *node, float *out, float *in)
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static void do_chroma_key(bNode *node, float *out, float *in)
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{
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{
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/* Algorithm of my own design-Bob Holcomb */
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NodeChroma *c;
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NodeChroma *c;
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float x, z, alpha;
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float x, z, alpha;
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float theta, beta, angle;
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float kfg, newY, newCb, newCr;
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c=node->storage;
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c=node->storage;
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switch(node->custom1)
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{
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/* Algorithm from book "Video Demistified" */
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case 1: /*green*/
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{
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/* find theta, the angle that the color space should be rotated based on key*/
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x=(atanf((c->t1*in[1])-(c->t1*c->t2))+1)/2;
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theta=atan2f(c->key[2],c->key[1]);
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z=(atanf((c->t3*in[2])-(c->t3*c->fsize))+1)/2;
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break;
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/*rotate the cb and cr into x/z space */
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}
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x=in[1]*cosf(theta)+in[2]*sinf(theta);
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case 2: /*blue*/
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z=in[2]*cosf(theta)-in[1]*sinf(theta);
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{
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x=(atanf((c->t1*in[1])-(c->t1*c->t2))+1)/2;
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/*if within the acceptance angle */
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z=(atanf((c->t3*in[2])-(c->t3*c->fsize))+1)/2;
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angle=c->t1*M_PI/180.0; /* convert to radians */
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x=1-x;
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break;
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/* if kfg is <0 then the pixel is outside of the key color */
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}
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kfg=x-(fabsf(z)/tanf(angle/2.0));
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default:
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{
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if(kfg>0.0) { /* found a pixel that is within key color */
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x= z= 0.0f;
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break;
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newY=in[0]-(1-c->t3)*kfg;
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}
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newCb=in[1]-kfg*cosf(theta);
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newCr=in[2]-kfg*sinf(theta);
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alpha=(kfg+c->fsize)*(c->fstrength);
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beta=atan2f(newCr,newCb);
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beta=beta*180.0/M_PI; /* convert to degrees for compare*/
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/* if beta is within the clippin angle */
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if(fabsf(beta)<(c->t2/2.0)) {
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newCb=0.0;
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newCr=0.0;
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alpha=0.0;
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}
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}
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/*clamp to zero so that negative values don' affect the other channels input */
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out[0]=newY;
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if(x<0.0) x=0.0;
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out[1]=newCb;
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if(z<0.0) z=0.0;
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out[2]=newCr;
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/*if chroma values added are less than strength then it is a key value */
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/* don't make something that was more transparent less transparent */
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if((x+z) < c->fstrength) {
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if (alpha<in[3]) {
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alpha=(x+z);
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alpha=in[0]+alpha; /*add in the luminence for detail */
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if(alpha > c->falpha) alpha=0; /* if below the threshold */
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if(alpha < in[3]) { /* is it less than the previous alpha */
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out[3]=alpha;
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out[3]=alpha;
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}
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}
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else {
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else {
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out[3]=in[3];
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out[3]=in[3];
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}
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}
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}
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}
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else { /*pixel is outside key color */
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out[0]=in[0];
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out[1]=in[1];
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out[2]=in[2];
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out[3]=in[3]; /* make pixel just as transparent as it was before */
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}
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}
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}
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static void node_composit_exec_chroma(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
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static void node_composit_exec_chroma(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
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@ -4758,6 +4773,8 @@ static void node_composit_exec_chroma(void *data, bNode *node, bNodeStack **in,
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/*convert rgbbuf to normalized chroma space*/
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/*convert rgbbuf to normalized chroma space*/
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composit1_pixel_processor(node, chromabuf, inbuf, in[0]->vec, do_rgba_to_ycca_normalized, CB_RGBA);
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composit1_pixel_processor(node, chromabuf, inbuf, in[0]->vec, do_rgba_to_ycca_normalized, CB_RGBA);
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/*convert key to normalized chroma color space */
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do_rgba_to_ycca_normalized(node, c->key, in[1]->vec);
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/*per pixel chroma key*/
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/*per pixel chroma key*/
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composit1_pixel_processor(node, chromabuf, chromabuf, in[0]->vec, do_chroma_key, CB_RGBA);
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composit1_pixel_processor(node, chromabuf, chromabuf, in[0]->vec, do_chroma_key, CB_RGBA);
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@ -1297,41 +1297,31 @@ static int node_composit_buts_chroma_matte(uiBlock *block, bNodeTree *ntree, bNo
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{
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{
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if(block) {
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if(block) {
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short dx=(butr->xmax-butr->xmin)/2;
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short dx=(butr->xmax-butr->xmin)/2;
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NodeChroma *c= node->storage;
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NodeChroma *c= node->storage;
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uiBlockBeginAlign(block);
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uiBlockBeginAlign(block);
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uiDefButS(block, ROW, B_NODE_EXEC+node->nr,"Green",
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Acceptance ",
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butr->xmin,butr->ymin+80,dx,20,
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butr->xmin, butr->ymin+60, butr->xmax-butr->xmin, 20,
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&node->custom1,1,1, 0, 0, "Select if using a green background");
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&c->t1, 1.0f, 80.0f, 100, 0, "Tolerance for colors to be considered a keying color");
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uiDefButS(block, ROW, B_NODE_EXEC+node->nr,"Blue",
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Cutoff ",
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butr->xmin+dx,butr->ymin+80,dx,20,
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butr->xmin, butr->ymin+40, butr->xmax-butr->xmin, 20,
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&node->custom1,1,2, 0, 0, "Select if using a blue background");
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&c->t2, 0.0f, 30.0f, 100, 0, "Colors below this will be considered as exact matches for keying color");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Cb Slope ",
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Lift ",
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butr->xmin, butr->ymin+60, dx, 20,
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butr->xmin, butr->ymin+20, dx, 20,
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&c->t1, 0.0f, 20.0f, 100, 0, "Adjusts the weight a pixel's value has in determining if it is a key color");
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&c->fsize, 0.0f, 1.0f, 100, 0, "Alpha Lift");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Gain ",
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butr->xmin+dx, butr->ymin+20, dx, 20,
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&c->fstrength, 0.0f, 1.0f, 100, 0, "Alpha Gain");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Cr slope ",
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Shadow Adjust ",
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butr->xmin+dx, butr->ymin+60, dx, 20,
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&c->t3, 0.0f, 20.0f, 100, 0, "Adjusts the weight a pixel's value has in determining if it is a key color");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Cb Pos ",
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butr->xmin, butr->ymin+40, dx, 20,
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&c->t2, 0.0f, 1.0f, 100, 0, "Pixel values less than this setting are considered a key color");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Cr pos ",
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butr->xmin+dx, butr->ymin+40, dx, 20,
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&c->fsize, 0.0f, 1.0f, 100, 0, "Pixel values less than this setting are considered a key color");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Alpha Threshold ",
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butr->xmin, butr->ymin+20, butr->xmax-butr->xmin, 20,
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&c->fstrength, 0.0f, 0.25f, 100, 0, "Key colored pixels below this setting are considered transparent");
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uiDefButF(block, NUMSLI, B_NODE_EXEC+node->nr, "Detail Threshold ",
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butr->xmin, butr->ymin, butr->xmax-butr->xmin, 20,
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butr->xmin, butr->ymin, butr->xmax-butr->xmin, 20,
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&c->falpha, 0.0f, 1.0f, 100, 0, "Keyed pixels below this setting are not processed for detail alpha adjustment");
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&c->t3, 0.0f, 1.0f, 100, 0, "Adjusts the brightness of any shadows captured");
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if(c->t2 > c->t1)
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c->t2=c->t1;
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}
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}
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return 100;
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return 80;
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}
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}
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static int node_composit_buts_channel_matte(uiBlock *block, bNodeTree *ntree, bNode *node, rctf *butr)
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static int node_composit_buts_channel_matte(uiBlock *block, bNodeTree *ntree, bNode *node, rctf *butr)
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